FLAGMAN

IMO 8135215

Vessel information

Vessel Name FLAGMAN
IMO Number 8135215
MMSI 273443820
Vessel Type Tanker
Flag 🇷🇺 Russia
Call Sign UGZH
Length 47 m
Beam 8 m

Detected Events (100)

Sts Prigorodnoye/Sakhalin LNG
Oct 28, 2026 02:17 UTC 85/100 ▼
Vessel A: IMO 8135215 (FLAGMAN) Russia
Vessel B: IMO 8930744 (ZAPRAVSHCHIK 05) Russia
  • Minimum Distance: 290 meters
  • Average Distance: 292 meters
  • Duration: 2h 12m
  • Period: 2026-10-28T02:17:06+00:00 to 2026-10-28T04:29:07+00:00
  • Vessel A Avg Speed: 0.1 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Prigorodnoye/Sakhalin LNG

Confidence Analysis

Score: 85/100

High-confidence STS candidate. Two tankers (FLAGMAN and ZAPRAVSHCHIK 05) maintained close proximity (min 290m, avg 292m) for 132 minutes. Both vessels were slow-moving (avg speeds 0.1 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Prigorodnoye/Sakhalin LNG, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness15/25Min distance 290m, avg 292m
Duration25/25Duration 132 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±1m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Prigorodnoye/Sakhalin LNG
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273443820,
        "imo": 8135215,
        "name": "FLAGMAN",
        "flag": "Russia"
    },
    "vessel_b": {
        "mmsi": 273439180,
        "imo": 8930744,
        "name": "ZAPRAVSHCHIK 05",
        "flag": "Russia"
    },
    "min_distance_m": 289.6000000000000227373675443232059478759765625,
    "avg_distance_m": 291.69999999999998863131622783839702606201171875,
    "distance_consistency_m": 1.1999999999999999555910790149937383830547332763671875,
    "duration_minutes": 132,
    "overlap_duration_s": 7921,
    "speed_a_avg": 0.059999999999999997779553950749686919152736663818359375,
    "speed_a_std": 0.05000000000000000277555756156289135105907917022705078125,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.059999999999999997779553950749686919152736663818359375,
            "max_sog": 0.1000000000000000055511151231257827021181583404541015625
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-10-28T02:17:06+00:00",
        "end": "2026-10-28T04:29:07+00:00"
    },
    "points_count": {
        "vessel_a": 5,
        "vessel_b": 5
    },
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "score": {
        "value": 85,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 290m, avg 292m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 132 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b11m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Prigorodnoye\/Sakhalin LNG"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (FLAGMAN and ZAPRAVSHCHIK 05) maintained close proximity (min 290m, avg 292m) for 132 minutes. Both vessels were slow-moving (avg speeds 0.1 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Prigorodnoye\/Sakhalin LNG, a known STS activity area."
    }
}
Methodology: 2026.01.18
Sts Sakhalin South Approach
Oct 28, 2026 02:17 UTC 85/100 ▼
Vessel A: IMO 8135215 (FLAGMAN) Russia
Vessel B: IMO 8930744 (ZAPRAVSHCHIK 05) Russia
  • Minimum Distance: 290 meters
  • Average Distance: 292 meters
  • Duration: 2h 12m
  • Period: 2026-10-28T02:17:06+00:00 to 2026-10-28T04:29:07+00:00
  • Vessel A Avg Speed: 0.1 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Sakhalin South Approach

Confidence Analysis

Score: 85/100

High-confidence STS candidate. Two tankers (FLAGMAN and ZAPRAVSHCHIK 05) maintained close proximity (min 290m, avg 292m) for 132 minutes. Both vessels were slow-moving (avg speeds 0.1 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Sakhalin South Approach, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness15/25Min distance 290m, avg 292m
Duration25/25Duration 132 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±1m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Sakhalin South Approach
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273443820,
        "imo": 8135215,
        "name": "FLAGMAN",
        "flag": "Russia"
    },
    "vessel_b": {
        "mmsi": 273439180,
        "imo": 8930744,
        "name": "ZAPRAVSHCHIK 05",
        "flag": "Russia"
    },
    "min_distance_m": 289.6000000000000227373675443232059478759765625,
    "avg_distance_m": 291.69999999999998863131622783839702606201171875,
    "distance_consistency_m": 1.1999999999999999555910790149937383830547332763671875,
    "duration_minutes": 132,
    "overlap_duration_s": 7921,
    "speed_a_avg": 0.059999999999999997779553950749686919152736663818359375,
    "speed_a_std": 0.05000000000000000277555756156289135105907917022705078125,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.059999999999999997779553950749686919152736663818359375,
            "max_sog": 0.1000000000000000055511151231257827021181583404541015625
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-10-28T02:17:06+00:00",
        "end": "2026-10-28T04:29:07+00:00"
    },
    "points_count": {
        "vessel_a": 5,
        "vessel_b": 5
    },
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "score": {
        "value": 85,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 290m, avg 292m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 132 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b11m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Sakhalin South Approach"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (FLAGMAN and ZAPRAVSHCHIK 05) maintained close proximity (min 290m, avg 292m) for 132 minutes. Both vessels were slow-moving (avg speeds 0.1 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Sakhalin South Approach, a known STS activity area."
    }
}
Methodology: 2026.01.18
Sts Prigorodnoye/Sakhalin LNG
Oct 28, 2026 00:44 UTC 85/100 ▼
Vessel A: IMO 9084401 (AZOV) Russia
Vessel B: IMO 8135215 (FLAGMAN) Russia
  • Minimum Distance: 183 meters
  • Average Distance: 188 meters
  • Duration: 1h 48m
  • Period: 2026-10-28T00:44:07+00:00 to 2026-10-28T02:32:17+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Prigorodnoye/Sakhalin LNG

Confidence Analysis

Score: 85/100

High-confidence STS candidate. Two tankers (AZOV and FLAGMAN) maintained close proximity (min 183m, avg 188m) for 108 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Prigorodnoye/Sakhalin LNG, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness20/25Min distance 183m, avg 188m
Duration20/25Duration 108 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±3m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Prigorodnoye/Sakhalin LNG
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273456730,
        "imo": 9084401,
        "name": "AZOV",
        "flag": "Russia"
    },
    "vessel_b": {
        "mmsi": 273443820,
        "imo": 8135215,
        "name": "FLAGMAN",
        "flag": "Russia"
    },
    "min_distance_m": 183.400000000000005684341886080801486968994140625,
    "avg_distance_m": 187.599999999999994315658113919198513031005859375,
    "distance_consistency_m": 3,
    "duration_minutes": 108.2000000000000028421709430404007434844970703125,
    "overlap_duration_s": 6490,
    "speed_a_avg": 0,
    "speed_a_std": 0,
    "speed_b_avg": 0.01000000000000000020816681711721685132943093776702880859375,
    "speed_b_std": 0.040000000000000000832667268468867405317723751068115234375,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0,
            "max_sog": 0
        },
        "vessel_b": {
            "avg_sog": 0.01000000000000000020816681711721685132943093776702880859375,
            "max_sog": 0.1000000000000000055511151231257827021181583404541015625
        }
    },
    "time_window": {
        "start": "2026-10-28T00:44:07+00:00",
        "end": "2026-10-28T02:32:17+00:00"
    },
    "points_count": {
        "vessel_a": 29,
        "vessel_b": 29
    },
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "score": {
        "value": 85,
        "components": {
            "distance_tightness": {
                "score": 20,
                "max": 25,
                "detail": "Min distance 183m, avg 188m"
            },
            "duration": {
                "score": 20,
                "max": 25,
                "detail": "Duration 108 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b13m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Prigorodnoye\/Sakhalin LNG"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (AZOV and FLAGMAN) maintained close proximity (min 183m, avg 188m) for 108 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Prigorodnoye\/Sakhalin LNG, a known STS activity area."
    }
}
Methodology: 2026.01.18
Sts Sakhalin South Approach
Oct 28, 2026 00:44 UTC 85/100 ▼
Vessel A: IMO 9084401 (AZOV) Russia
Vessel B: IMO 8135215 (FLAGMAN) Russia
  • Minimum Distance: 183 meters
  • Average Distance: 188 meters
  • Duration: 1h 48m
  • Period: 2026-10-28T00:44:07+00:00 to 2026-10-28T02:32:17+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Sakhalin South Approach

Confidence Analysis

Score: 85/100

High-confidence STS candidate. Two tankers (AZOV and FLAGMAN) maintained close proximity (min 183m, avg 188m) for 108 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Sakhalin South Approach, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness20/25Min distance 183m, avg 188m
Duration20/25Duration 108 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±3m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Sakhalin South Approach
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273456730,
        "imo": 9084401,
        "name": "AZOV",
        "flag": "Russia"
    },
    "vessel_b": {
        "mmsi": 273443820,
        "imo": 8135215,
        "name": "FLAGMAN",
        "flag": "Russia"
    },
    "min_distance_m": 183.400000000000005684341886080801486968994140625,
    "avg_distance_m": 187.599999999999994315658113919198513031005859375,
    "distance_consistency_m": 3,
    "duration_minutes": 108.2000000000000028421709430404007434844970703125,
    "overlap_duration_s": 6490,
    "speed_a_avg": 0,
    "speed_a_std": 0,
    "speed_b_avg": 0.01000000000000000020816681711721685132943093776702880859375,
    "speed_b_std": 0.040000000000000000832667268468867405317723751068115234375,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0,
            "max_sog": 0
        },
        "vessel_b": {
            "avg_sog": 0.01000000000000000020816681711721685132943093776702880859375,
            "max_sog": 0.1000000000000000055511151231257827021181583404541015625
        }
    },
    "time_window": {
        "start": "2026-10-28T00:44:07+00:00",
        "end": "2026-10-28T02:32:17+00:00"
    },
    "points_count": {
        "vessel_a": 29,
        "vessel_b": 29
    },
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "score": {
        "value": 85,
        "components": {
            "distance_tightness": {
                "score": 20,
                "max": 25,
                "detail": "Min distance 183m, avg 188m"
            },
            "duration": {
                "score": 20,
                "max": 25,
                "detail": "Duration 108 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b13m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Sakhalin South Approach"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (AZOV and FLAGMAN) maintained close proximity (min 183m, avg 188m) for 108 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Sakhalin South Approach, a known STS activity area."
    }
}
Methodology: 2026.01.18
Sts Prigorodnoye/Sakhalin LNG
Oct 28, 2026 00:42 UTC 80/100 ▼
Vessel A: IMO 8930744 (ZAPRAVSHCHIK 05) Russia
Vessel B: IMO 8135215 (FLAGMAN) Russia
  • Minimum Distance: 290 meters
  • Average Distance: 292 meters
  • Duration: 1h 45m
  • Period: 2026-10-28T00:42:49+00:00 to 2026-10-28T02:27:48+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Prigorodnoye/Sakhalin LNG

Confidence Analysis

Score: 80/100

High-confidence STS candidate. Two tankers (ZAPRAVSHCHIK 05 and FLAGMAN) maintained close proximity (min 290m, avg 292m) for 105 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Prigorodnoye/Sakhalin LNG, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness15/25Min distance 290m, avg 292m
Duration20/25Duration 105 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±1m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Prigorodnoye/Sakhalin LNG
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273439180,
        "imo": 8930744,
        "name": "ZAPRAVSHCHIK 05",
        "flag": "Russia"
    },
    "vessel_b": {
        "mmsi": 273443820,
        "imo": 8135215,
        "name": "FLAGMAN",
        "flag": "Russia"
    },
    "min_distance_m": 289.8999999999999772626324556767940521240234375,
    "avg_distance_m": 292.30000000000001136868377216160297393798828125,
    "distance_consistency_m": 1.3000000000000000444089209850062616169452667236328125,
    "duration_minutes": 105,
    "overlap_duration_s": 6299,
    "speed_a_avg": 0,
    "speed_a_std": 0,
    "speed_b_avg": 0.01000000000000000020816681711721685132943093776702880859375,
    "speed_b_std": 0.040000000000000000832667268468867405317723751068115234375,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0,
            "max_sog": 0
        },
        "vessel_b": {
            "avg_sog": 0.01000000000000000020816681711721685132943093776702880859375,
            "max_sog": 0.1000000000000000055511151231257827021181583404541015625
        }
    },
    "time_window": {
        "start": "2026-10-28T00:42:49+00:00",
        "end": "2026-10-28T02:27:48+00:00"
    },
    "points_count": {
        "vessel_a": 7,
        "vessel_b": 7
    },
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "score": {
        "value": 80,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 290m, avg 292m"
            },
            "duration": {
                "score": 20,
                "max": 25,
                "detail": "Duration 105 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b11m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Prigorodnoye\/Sakhalin LNG"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (ZAPRAVSHCHIK 05 and FLAGMAN) maintained close proximity (min 290m, avg 292m) for 105 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Prigorodnoye\/Sakhalin LNG, a known STS activity area."
    }
}
Methodology: 2026.01.18
Sts Sakhalin South Approach
Oct 28, 2026 00:42 UTC 80/100 ▼
Vessel A: IMO 8930744 (ZAPRAVSHCHIK 05) Russia
Vessel B: IMO 8135215 (FLAGMAN) Russia
  • Minimum Distance: 290 meters
  • Average Distance: 292 meters
  • Duration: 1h 45m
  • Period: 2026-10-28T00:42:49+00:00 to 2026-10-28T02:27:48+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Sakhalin South Approach

Confidence Analysis

Score: 80/100

High-confidence STS candidate. Two tankers (ZAPRAVSHCHIK 05 and FLAGMAN) maintained close proximity (min 290m, avg 292m) for 105 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Sakhalin South Approach, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness15/25Min distance 290m, avg 292m
Duration20/25Duration 105 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±1m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Sakhalin South Approach
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273439180,
        "imo": 8930744,
        "name": "ZAPRAVSHCHIK 05",
        "flag": "Russia"
    },
    "vessel_b": {
        "mmsi": 273443820,
        "imo": 8135215,
        "name": "FLAGMAN",
        "flag": "Russia"
    },
    "min_distance_m": 289.8999999999999772626324556767940521240234375,
    "avg_distance_m": 292.30000000000001136868377216160297393798828125,
    "distance_consistency_m": 1.3000000000000000444089209850062616169452667236328125,
    "duration_minutes": 105,
    "overlap_duration_s": 6299,
    "speed_a_avg": 0,
    "speed_a_std": 0,
    "speed_b_avg": 0.01000000000000000020816681711721685132943093776702880859375,
    "speed_b_std": 0.040000000000000000832667268468867405317723751068115234375,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0,
            "max_sog": 0
        },
        "vessel_b": {
            "avg_sog": 0.01000000000000000020816681711721685132943093776702880859375,
            "max_sog": 0.1000000000000000055511151231257827021181583404541015625
        }
    },
    "time_window": {
        "start": "2026-10-28T00:42:49+00:00",
        "end": "2026-10-28T02:27:48+00:00"
    },
    "points_count": {
        "vessel_a": 7,
        "vessel_b": 7
    },
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "score": {
        "value": 80,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 290m, avg 292m"
            },
            "duration": {
                "score": 20,
                "max": 25,
                "detail": "Duration 105 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b11m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Sakhalin South Approach"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (ZAPRAVSHCHIK 05 and FLAGMAN) maintained close proximity (min 290m, avg 292m) for 105 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Sakhalin South Approach, a known STS activity area."
    }
}
Methodology: 2026.01.18
Sts Prigorodnoye/Sakhalin LNG
Oct 27, 2026 23:02 UTC 80/100 ▼
Vessel A: IMO 8135215 (FLAGMAN) Russia
Vessel B: IMO 8930744 (ZAPRAVSHCHIK 05) Russia
  • Minimum Distance: 290 meters
  • Average Distance: 292 meters
  • Duration: 1h 54m
  • Period: 2026-10-27T23:02:04+00:00 to 2026-10-28T00:56:05+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Prigorodnoye/Sakhalin LNG

Confidence Analysis

Score: 80/100

High-confidence STS candidate. Two tankers (FLAGMAN and ZAPRAVSHCHIK 05) maintained close proximity (min 290m, avg 292m) for 114 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Prigorodnoye/Sakhalin LNG, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness15/25Min distance 290m, avg 292m
Duration20/25Duration 114 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±2m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Prigorodnoye/Sakhalin LNG
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273443820,
        "imo": 8135215,
        "name": "FLAGMAN",
        "flag": "Russia"
    },
    "vessel_b": {
        "mmsi": 273439180,
        "imo": 8930744,
        "name": "ZAPRAVSHCHIK 05",
        "flag": "Russia"
    },
    "min_distance_m": 290.3999999999999772626324556767940521240234375,
    "avg_distance_m": 292.30000000000001136868377216160297393798828125,
    "distance_consistency_m": 1.6999999999999999555910790149937383830547332763671875,
    "duration_minutes": 114,
    "overlap_duration_s": 6841,
    "speed_a_avg": 0,
    "speed_a_std": 0,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0,
            "max_sog": 0
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-10-27T23:02:04+00:00",
        "end": "2026-10-28T00:56:05+00:00"
    },
    "points_count": {
        "vessel_a": 3,
        "vessel_b": 3
    },
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "score": {
        "value": 80,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 290m, avg 292m"
            },
            "duration": {
                "score": 20,
                "max": 25,
                "detail": "Duration 114 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b12m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Prigorodnoye\/Sakhalin LNG"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (FLAGMAN and ZAPRAVSHCHIK 05) maintained close proximity (min 290m, avg 292m) for 114 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Prigorodnoye\/Sakhalin LNG, a known STS activity area."
    }
}
Methodology: 2026.01.18
Sts Sakhalin South Approach
Oct 27, 2026 23:02 UTC 80/100 ▼
Vessel A: IMO 8135215 (FLAGMAN) Russia
Vessel B: IMO 8930744 (ZAPRAVSHCHIK 05) Russia
  • Minimum Distance: 290 meters
  • Average Distance: 292 meters
  • Duration: 1h 54m
  • Period: 2026-10-27T23:02:04+00:00 to 2026-10-28T00:56:05+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Sakhalin South Approach

Confidence Analysis

Score: 80/100

High-confidence STS candidate. Two tankers (FLAGMAN and ZAPRAVSHCHIK 05) maintained close proximity (min 290m, avg 292m) for 114 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Sakhalin South Approach, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness15/25Min distance 290m, avg 292m
Duration20/25Duration 114 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±2m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Sakhalin South Approach
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273443820,
        "imo": 8135215,
        "name": "FLAGMAN",
        "flag": "Russia"
    },
    "vessel_b": {
        "mmsi": 273439180,
        "imo": 8930744,
        "name": "ZAPRAVSHCHIK 05",
        "flag": "Russia"
    },
    "min_distance_m": 290.3999999999999772626324556767940521240234375,
    "avg_distance_m": 292.30000000000001136868377216160297393798828125,
    "distance_consistency_m": 1.6999999999999999555910790149937383830547332763671875,
    "duration_minutes": 114,
    "overlap_duration_s": 6841,
    "speed_a_avg": 0,
    "speed_a_std": 0,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0,
            "max_sog": 0
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-10-27T23:02:04+00:00",
        "end": "2026-10-28T00:56:05+00:00"
    },
    "points_count": {
        "vessel_a": 3,
        "vessel_b": 3
    },
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "score": {
        "value": 80,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 290m, avg 292m"
            },
            "duration": {
                "score": 20,
                "max": 25,
                "detail": "Duration 114 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b12m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Sakhalin South Approach"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (FLAGMAN and ZAPRAVSHCHIK 05) maintained close proximity (min 290m, avg 292m) for 114 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Sakhalin South Approach, a known STS activity area."
    }
}
Methodology: 2026.01.18
Sts🛰️✗ Prigorodnoye/Sakhalin LNG
Oct 27, 2026 22:17 UTC 88/100 ▼
Vessel A: IMO 8135215 (FLAGMAN) Russia
Vessel B: IMO 9084401 (AZOV) Russia
  • Minimum Distance: 7 meters
  • Average Distance: 159 meters
  • Duration: 4h 9m
  • Period: 2026-10-27T22:17:03+00:00 to 2026-10-28T02:26:06+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Prigorodnoye/Sakhalin LNG

Confidence Analysis

Score: 88/100

High-confidence STS candidate. Two tankers (FLAGMAN and AZOV) maintained close proximity (min 7m, avg 159m) for 249 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). Moderate distance variation observed during the encounter. Event occurred in Prigorodnoye/Sakhalin LNG, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness25/25Min distance 7m, avg 159m
Duration25/25Duration 249 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency8/15Distance variance ±63m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Prigorodnoye/Sakhalin LNG

🛰️ Satellite Corroboration

✗ SAR Not Available

No satellite imagery for this time/location

No Sentinel-1 scenes covering AOI and time window

Searched: 2026-10-28T04:45:09.822496+00:00

Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273443820,
        "imo": 8135215,
        "name": "FLAGMAN",
        "flag": "Russia"
    },
    "vessel_b": {
        "mmsi": 273456730,
        "imo": 9084401,
        "name": "AZOV",
        "flag": "Russia"
    },
    "min_distance_m": 7.0999999999999996447286321199499070644378662109375,
    "avg_distance_m": 159.30000000000001136868377216160297393798828125,
    "distance_consistency_m": 62.7999999999999971578290569595992565155029296875,
    "duration_minutes": 249.099999999999994315658113919198513031005859375,
    "overlap_duration_s": 14943,
    "speed_a_avg": 0.01000000000000000020816681711721685132943093776702880859375,
    "speed_a_std": 0.040000000000000000832667268468867405317723751068115234375,
    "speed_b_avg": 0.0200000000000000004163336342344337026588618755340576171875,
    "speed_b_std": 0.059999999999999997779553950749686919152736663818359375,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.01000000000000000020816681711721685132943093776702880859375,
            "max_sog": 0.1000000000000000055511151231257827021181583404541015625
        },
        "vessel_b": {
            "avg_sog": 0.0200000000000000004163336342344337026588618755340576171875,
            "max_sog": 0.200000000000000011102230246251565404236316680908203125
        }
    },
    "time_window": {
        "start": "2026-10-27T22:17:03+00:00",
        "end": "2026-10-28T02:26:06+00:00"
    },
    "points_count": {
        "vessel_a": 15,
        "vessel_b": 15
    },
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "score": {
        "value": 88,
        "components": {
            "distance_tightness": {
                "score": 25,
                "max": 25,
                "detail": "Min distance 7m, avg 159m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 249 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 8,
                "max": 15,
                "detail": "Distance variance \u00b163m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Prigorodnoye\/Sakhalin LNG"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (FLAGMAN and AZOV) maintained close proximity (min 7m, avg 159m) for 249 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). Moderate distance variation observed during the encounter. Event occurred in Prigorodnoye\/Sakhalin LNG, a known STS activity area."
    },
    "sar": {
        "status": "not_found",
        "centroid": {
            "lat": 46.62337140000000346162778441794216632843017578125,
            "lon": 142.76903179999999338178895413875579833984375
        },
        "time_window": {
            "start_ts": "2026-10-27T22:17:03+00:00",
            "end_ts": "2026-10-28T02:26:06+00:00"
        },
        "searched_at": "2026-10-28T04:45:09.822496+00:00",
        "notes": "No Sentinel-1 scenes covering AOI and time window"
    }
}
Methodology: 2026.01.18
Sts🛰️✗ Sakhalin South Approach
Oct 27, 2026 22:17 UTC 88/100 ▼
Vessel A: IMO 8135215 (FLAGMAN) Russia
Vessel B: IMO 9084401 (AZOV) Russia
  • Minimum Distance: 7 meters
  • Average Distance: 159 meters
  • Duration: 4h 9m
  • Period: 2026-10-27T22:17:03+00:00 to 2026-10-28T02:26:06+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Sakhalin South Approach

Confidence Analysis

Score: 88/100

High-confidence STS candidate. Two tankers (FLAGMAN and AZOV) maintained close proximity (min 7m, avg 159m) for 249 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). Moderate distance variation observed during the encounter. Event occurred in Sakhalin South Approach, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness25/25Min distance 7m, avg 159m
Duration25/25Duration 249 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency8/15Distance variance ±63m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Sakhalin South Approach

🛰️ Satellite Corroboration

✗ SAR Not Available

No satellite imagery for this time/location

No Sentinel-1 scenes covering AOI and time window

Searched: 2026-10-28T04:45:12.212740+00:00

Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273443820,
        "imo": 8135215,
        "name": "FLAGMAN",
        "flag": "Russia"
    },
    "vessel_b": {
        "mmsi": 273456730,
        "imo": 9084401,
        "name": "AZOV",
        "flag": "Russia"
    },
    "min_distance_m": 7.0999999999999996447286321199499070644378662109375,
    "avg_distance_m": 159.30000000000001136868377216160297393798828125,
    "distance_consistency_m": 62.7999999999999971578290569595992565155029296875,
    "duration_minutes": 249.099999999999994315658113919198513031005859375,
    "overlap_duration_s": 14943,
    "speed_a_avg": 0.01000000000000000020816681711721685132943093776702880859375,
    "speed_a_std": 0.040000000000000000832667268468867405317723751068115234375,
    "speed_b_avg": 0.0200000000000000004163336342344337026588618755340576171875,
    "speed_b_std": 0.059999999999999997779553950749686919152736663818359375,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.01000000000000000020816681711721685132943093776702880859375,
            "max_sog": 0.1000000000000000055511151231257827021181583404541015625
        },
        "vessel_b": {
            "avg_sog": 0.0200000000000000004163336342344337026588618755340576171875,
            "max_sog": 0.200000000000000011102230246251565404236316680908203125
        }
    },
    "time_window": {
        "start": "2026-10-27T22:17:03+00:00",
        "end": "2026-10-28T02:26:06+00:00"
    },
    "points_count": {
        "vessel_a": 15,
        "vessel_b": 15
    },
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "score": {
        "value": 88,
        "components": {
            "distance_tightness": {
                "score": 25,
                "max": 25,
                "detail": "Min distance 7m, avg 159m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 249 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 8,
                "max": 15,
                "detail": "Distance variance \u00b163m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Sakhalin South Approach"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (FLAGMAN and AZOV) maintained close proximity (min 7m, avg 159m) for 249 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). Moderate distance variation observed during the encounter. Event occurred in Sakhalin South Approach, a known STS activity area."
    },
    "sar": {
        "status": "not_found",
        "centroid": {
            "lat": 46.62337140000000346162778441794216632843017578125,
            "lon": 142.76903179999999338178895413875579833984375
        },
        "time_window": {
            "start_ts": "2026-10-27T22:17:03+00:00",
            "end_ts": "2026-10-28T02:26:06+00:00"
        },
        "searched_at": "2026-10-28T04:45:12.212740+00:00",
        "notes": "No Sentinel-1 scenes covering AOI and time window"
    }
}
Methodology: 2026.01.18
Sts🛰️✗ Prigorodnoye/Sakhalin LNG
Oct 27, 2026 22:05 UTC 75/100 ▼
Vessel A: IMO 8930744 (ZAPRAVSHCHIK 05) Russia
Vessel B: IMO 8135215 (FLAGMAN) Russia
  • Minimum Distance: 292 meters
  • Average Distance: 293 meters
  • Duration: 1h 5m
  • Period: 2026-10-27T22:05:48+00:00 to 2026-10-27T23:10:49+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Prigorodnoye/Sakhalin LNG

Confidence Analysis

Score: 75/100

Moderate-confidence STS candidate. Two tankers (ZAPRAVSHCHIK 05 and FLAGMAN) maintained close proximity (min 292m, avg 293m) for 65 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Prigorodnoye/Sakhalin LNG, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness15/25Min distance 292m, avg 293m
Duration15/25Duration 65 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±1m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Prigorodnoye/Sakhalin LNG

🛰️ Satellite Corroboration

✗ SAR Not Available

No satellite imagery for this time/location

No Sentinel-1 scenes covering AOI and time window

Searched: 2026-10-28T04:45:04.491004+00:00

Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273439180,
        "imo": 8930744,
        "name": "ZAPRAVSHCHIK 05",
        "flag": "Russia"
    },
    "vessel_b": {
        "mmsi": 273443820,
        "imo": 8135215,
        "name": "FLAGMAN",
        "flag": "Russia"
    },
    "min_distance_m": 292.1000000000000227373675443232059478759765625,
    "avg_distance_m": 292.8999999999999772626324556767940521240234375,
    "distance_consistency_m": 0.6999999999999999555910790149937383830547332763671875,
    "duration_minutes": 65,
    "overlap_duration_s": 3901,
    "speed_a_avg": 0,
    "speed_a_std": 0,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0,
            "max_sog": 0
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-10-27T22:05:48+00:00",
        "end": "2026-10-27T23:10:49+00:00"
    },
    "points_count": {
        "vessel_a": 4,
        "vessel_b": 4
    },
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "score": {
        "value": 75,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 292m, avg 293m"
            },
            "duration": {
                "score": 15,
                "max": 25,
                "detail": "Duration 65 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b11m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Prigorodnoye\/Sakhalin LNG"
            }
        },
        "summary": "Moderate-confidence STS candidate. Two tankers (ZAPRAVSHCHIK 05 and FLAGMAN) maintained close proximity (min 292m, avg 293m) for 65 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Prigorodnoye\/Sakhalin LNG, a known STS activity area."
    },
    "sar": {
        "status": "not_found",
        "centroid": {
            "lat": 46.62480819999999681613189750351011753082275390625,
            "lon": 142.76753999999999678038875572383403778076171875
        },
        "time_window": {
            "start_ts": "2026-10-27T22:05:48+00:00",
            "end_ts": "2026-10-27T23:10:49+00:00"
        },
        "searched_at": "2026-10-28T04:45:04.491004+00:00",
        "notes": "No Sentinel-1 scenes covering AOI and time window"
    }
}
Methodology: 2026.01.18
Sts🛰️✗ Sakhalin South Approach
Oct 27, 2026 22:05 UTC 75/100 ▼
Vessel A: IMO 8930744 (ZAPRAVSHCHIK 05) Russia
Vessel B: IMO 8135215 (FLAGMAN) Russia
  • Minimum Distance: 292 meters
  • Average Distance: 293 meters
  • Duration: 1h 5m
  • Period: 2026-10-27T22:05:48+00:00 to 2026-10-27T23:10:49+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Sakhalin South Approach

Confidence Analysis

Score: 75/100

Moderate-confidence STS candidate. Two tankers (ZAPRAVSHCHIK 05 and FLAGMAN) maintained close proximity (min 292m, avg 293m) for 65 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Sakhalin South Approach, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness15/25Min distance 292m, avg 293m
Duration15/25Duration 65 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±1m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Sakhalin South Approach

🛰️ Satellite Corroboration

✗ SAR Not Available

No satellite imagery for this time/location

No Sentinel-1 scenes covering AOI and time window

Searched: 2026-10-28T04:45:07.139579+00:00

Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273439180,
        "imo": 8930744,
        "name": "ZAPRAVSHCHIK 05",
        "flag": "Russia"
    },
    "vessel_b": {
        "mmsi": 273443820,
        "imo": 8135215,
        "name": "FLAGMAN",
        "flag": "Russia"
    },
    "min_distance_m": 292.1000000000000227373675443232059478759765625,
    "avg_distance_m": 292.8999999999999772626324556767940521240234375,
    "distance_consistency_m": 0.6999999999999999555910790149937383830547332763671875,
    "duration_minutes": 65,
    "overlap_duration_s": 3901,
    "speed_a_avg": 0,
    "speed_a_std": 0,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0,
            "max_sog": 0
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-10-27T22:05:48+00:00",
        "end": "2026-10-27T23:10:49+00:00"
    },
    "points_count": {
        "vessel_a": 4,
        "vessel_b": 4
    },
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "score": {
        "value": 75,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 292m, avg 293m"
            },
            "duration": {
                "score": 15,
                "max": 25,
                "detail": "Duration 65 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b11m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Sakhalin South Approach"
            }
        },
        "summary": "Moderate-confidence STS candidate. Two tankers (ZAPRAVSHCHIK 05 and FLAGMAN) maintained close proximity (min 292m, avg 293m) for 65 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Sakhalin South Approach, a known STS activity area."
    },
    "sar": {
        "status": "not_found",
        "centroid": {
            "lat": 46.62480819999999681613189750351011753082275390625,
            "lon": 142.76753999999999678038875572383403778076171875
        },
        "time_window": {
            "start_ts": "2026-10-27T22:05:48+00:00",
            "end_ts": "2026-10-27T23:10:49+00:00"
        },
        "searched_at": "2026-10-28T04:45:07.139579+00:00",
        "notes": "No Sentinel-1 scenes covering AOI and time window"
    }
}
Methodology: 2026.01.18
Zone Dwell Prigorodnoye/Sakhalin LNG
Oct 27, 2026 22:02 UTC 80.0% ▼
  • Zone: Prigorodnoye/Sakhalin LNG
  • Duration: 6h 33m
  • Data Points: 21 AIS positions
  • Period: 2026-10-27T22:02:04+00:00 to 2026-10-28T04:35:07+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "dwell_minutes": 393.1000000000000227373675443232059478759765625,
    "points_in_zone": 21,
    "first_point": {
        "ts": "2026-10-27T22:02:04+00:00",
        "lat": 46.6240667000000001962689566425979137420654296875,
        "lon": 142.769100000000008776623872108757495880126953125
    },
    "last_point": {
        "ts": "2026-10-28T04:35:07+00:00",
        "lat": 46.6240499999999968849806464277207851409912109375,
        "lon": 142.769100000000008776623872108757495880126953125
    }
}
Methodology: 2026.01.18
Zone Dwell Sakhalin South Approach
Oct 27, 2026 22:02 UTC 80.0% ▼
  • Zone: Sakhalin South Approach
  • Duration: 6h 33m
  • Data Points: 21 AIS positions
  • Period: 2026-10-27T22:02:04+00:00 to 2026-10-28T04:35:07+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "dwell_minutes": 393.1000000000000227373675443232059478759765625,
    "points_in_zone": 21,
    "first_point": {
        "ts": "2026-10-27T22:02:04+00:00",
        "lat": 46.6240667000000001962689566425979137420654296875,
        "lon": 142.769100000000008776623872108757495880126953125
    },
    "last_point": {
        "ts": "2026-10-28T04:35:07+00:00",
        "lat": 46.6240499999999968849806464277207851409912109375,
        "lon": 142.769100000000008776623872108757495880126953125
    }
}
Methodology: 2026.01.18
Loiter Prigorodnoye/Sakhalin LNG
Oct 27, 2026 22:02 UTC 75.0% ▼
  • Duration: 6h 33m
  • Radius: 6 meters
  • Data Points: 21 AIS positions
  • Centroid: 46.6241, 142.7691
  • Zone: Prigorodnoye/Sakhalin LNG
Show Raw Evidence JSON
{
    "radius_m": 6.0999999999999996447286321199499070644378662109375,
    "duration_minutes": 393.1000000000000227373675443232059478759765625,
    "points": 21,
    "centroid": {
        "lat": 46.62406509047618641261578886769711971282958984375,
        "lon": 142.76910603809523081508814357221126556396484375
    },
    "bbox": {
        "min_lat": 46.62403330000000067911969381384551525115966796875,
        "min_lon": 142.769083300000005465335561893880367279052734375,
        "max_lat": 46.62411670000000185609678737819194793701171875,
        "max_lon": 142.7691317000000026382622309029102325439453125
    },
    "zone_id": "russia_prigorodnoye"
}
Methodology: 2026.01.18
Loiter Sakhalin South Approach
Oct 27, 2026 22:02 UTC 75.0% ▼
  • Duration: 6h 33m
  • Radius: 6 meters
  • Data Points: 21 AIS positions
  • Centroid: 46.6241, 142.7691
  • Zone: Sakhalin South Approach
Show Raw Evidence JSON
{
    "radius_m": 6.0999999999999996447286321199499070644378662109375,
    "duration_minutes": 393.1000000000000227373675443232059478759765625,
    "points": 21,
    "centroid": {
        "lat": 46.62406509047618641261578886769711971282958984375,
        "lon": 142.76910603809523081508814357221126556396484375
    },
    "bbox": {
        "min_lat": 46.62403330000000067911969381384551525115966796875,
        "min_lon": 142.769083300000005465335561893880367279052734375,
        "max_lat": 46.62411670000000185609678737819194793701171875,
        "max_lon": 142.7691317000000026382622309029102325439453125
    },
    "zone_id": "russia_sakhalin_south"
}
Methodology: 2026.01.18
Zone Dwell Prigorodnoye/Sakhalin LNG
Oct 27, 2026 21:17 UTC 80.0% ▼
  • Zone: Prigorodnoye/Sakhalin LNG
  • Duration: 6h 21m
  • Data Points: 20 AIS positions
  • Period: 2026-10-27T21:47:04+00:00 to 2026-10-28T04:08:07+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "dwell_minutes": 381.1000000000000227373675443232059478759765625,
    "points_in_zone": 20,
    "first_point": {
        "ts": "2026-10-27T21:47:04+00:00",
        "lat": 46.6240667000000001962689566425979137420654296875,
        "lon": 142.769100000000008776623872108757495880126953125
    },
    "last_point": {
        "ts": "2026-10-28T04:08:07+00:00",
        "lat": 46.62403330000000067911969381384551525115966796875,
        "lon": 142.769100000000008776623872108757495880126953125
    }
}
Methodology: 2026.01.18
Zone Dwell Sakhalin South Approach
Oct 27, 2026 21:17 UTC 80.0% ▼
  • Zone: Sakhalin South Approach
  • Duration: 6h 21m
  • Data Points: 20 AIS positions
  • Period: 2026-10-27T21:47:04+00:00 to 2026-10-28T04:08:07+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "dwell_minutes": 381.1000000000000227373675443232059478759765625,
    "points_in_zone": 20,
    "first_point": {
        "ts": "2026-10-27T21:47:04+00:00",
        "lat": 46.6240667000000001962689566425979137420654296875,
        "lon": 142.769100000000008776623872108757495880126953125
    },
    "last_point": {
        "ts": "2026-10-28T04:08:07+00:00",
        "lat": 46.62403330000000067911969381384551525115966796875,
        "lon": 142.769100000000008776623872108757495880126953125
    }
}
Methodology: 2026.01.18
Loiter Prigorodnoye/Sakhalin LNG
Oct 27, 2026 21:17 UTC 75.0% ▼
  • Duration: 6h 21m
  • Radius: 6 meters
  • Data Points: 20 AIS positions
  • Centroid: 46.6241, 142.7691
  • Zone: Prigorodnoye/Sakhalin LNG
Show Raw Evidence JSON
{
    "radius_m": 5.9000000000000003552713678800500929355621337890625,
    "duration_minutes": 381.1000000000000227373675443232059478759765625,
    "points": 20,
    "centroid": {
        "lat": 46.62406667999999143603417905978858470916748046875,
        "lon": 142.76910717499998781931935809552669525146484375
    },
    "bbox": {
        "min_lat": 46.62403330000000067911969381384551525115966796875,
        "min_lon": 142.769083300000005465335561893880367279052734375,
        "max_lat": 46.62411670000000185609678737819194793701171875,
        "max_lon": 142.7691317000000026382622309029102325439453125
    },
    "zone_id": "russia_prigorodnoye"
}
Methodology: 2026.01.18
Loiter Sakhalin South Approach
Oct 27, 2026 21:17 UTC 75.0% ▼
  • Duration: 6h 21m
  • Radius: 6 meters
  • Data Points: 20 AIS positions
  • Centroid: 46.6241, 142.7691
  • Zone: Sakhalin South Approach
Show Raw Evidence JSON
{
    "radius_m": 5.9000000000000003552713678800500929355621337890625,
    "duration_minutes": 381.1000000000000227373675443232059478759765625,
    "points": 20,
    "centroid": {
        "lat": 46.62406667999999143603417905978858470916748046875,
        "lon": 142.76910717499998781931935809552669525146484375
    },
    "bbox": {
        "min_lat": 46.62403330000000067911969381384551525115966796875,
        "min_lon": 142.769083300000005465335561893880367279052734375,
        "max_lat": 46.62411670000000185609678737819194793701171875,
        "max_lon": 142.7691317000000026382622309029102325439453125
    },
    "zone_id": "russia_sakhalin_south"
}
Methodology: 2026.01.18
Sts🛰️✗ Prigorodnoye/Sakhalin LNG
Oct 27, 2026 21:14 UTC 80/100 ▼
Vessel A: IMO 8930744 (ZAPRAVSHCHIK 05) Russia
Vessel B: IMO 8135215 (FLAGMAN) Russia
  • Minimum Distance: 291 meters
  • Average Distance: 293 meters
  • Duration: 1h 56m
  • Period: 2026-10-27T21:14:51+00:00 to 2026-10-27T23:10:49+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Prigorodnoye/Sakhalin LNG

Confidence Analysis

Score: 80/100

High-confidence STS candidate. Two tankers (ZAPRAVSHCHIK 05 and FLAGMAN) maintained close proximity (min 291m, avg 293m) for 116 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Prigorodnoye/Sakhalin LNG, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness15/25Min distance 291m, avg 293m
Duration20/25Duration 116 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±1m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Prigorodnoye/Sakhalin LNG

🛰️ Satellite Corroboration

✗ SAR Not Available

No satellite imagery for this time/location

No Sentinel-1 scenes covering AOI and time window

Searched: 2026-10-28T02:15:01.971851+00:00

Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273439180,
        "imo": 8930744,
        "name": "ZAPRAVSHCHIK 05",
        "flag": "Russia"
    },
    "vessel_b": {
        "mmsi": 273443820,
        "imo": 8135215,
        "name": "FLAGMAN",
        "flag": "Russia"
    },
    "min_distance_m": 291.30000000000001136868377216160297393798828125,
    "avg_distance_m": 292.69999999999998863131622783839702606201171875,
    "distance_consistency_m": 1.100000000000000088817841970012523233890533447265625,
    "duration_minutes": 116,
    "overlap_duration_s": 6958,
    "speed_a_avg": 0,
    "speed_a_std": 0,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0,
            "max_sog": 0
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-10-27T21:14:51+00:00",
        "end": "2026-10-27T23:10:49+00:00"
    },
    "points_count": {
        "vessel_a": 8,
        "vessel_b": 8
    },
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "score": {
        "value": 80,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 291m, avg 293m"
            },
            "duration": {
                "score": 20,
                "max": 25,
                "detail": "Duration 116 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b11m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Prigorodnoye\/Sakhalin LNG"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (ZAPRAVSHCHIK 05 and FLAGMAN) maintained close proximity (min 291m, avg 293m) for 116 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Prigorodnoye\/Sakhalin LNG, a known STS activity area."
    },
    "sar": {
        "status": "not_found",
        "centroid": {
            "lat": 46.6248087999999967223629937507212162017822265625,
            "lon": 142.767539599999992105949786491692066192626953125
        },
        "time_window": {
            "start_ts": "2026-10-27T21:14:51+00:00",
            "end_ts": "2026-10-27T23:10:49+00:00"
        },
        "searched_at": "2026-10-28T02:15:01.971851+00:00",
        "notes": "No Sentinel-1 scenes covering AOI and time window"
    }
}
Methodology: 2026.01.18
Sts🛰️✗ Sakhalin South Approach
Oct 27, 2026 21:14 UTC 80/100 ▼
Vessel A: IMO 8930744 (ZAPRAVSHCHIK 05) Russia
Vessel B: IMO 8135215 (FLAGMAN) Russia
  • Minimum Distance: 291 meters
  • Average Distance: 293 meters
  • Duration: 1h 56m
  • Period: 2026-10-27T21:14:51+00:00 to 2026-10-27T23:10:49+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Sakhalin South Approach

Confidence Analysis

Score: 80/100

High-confidence STS candidate. Two tankers (ZAPRAVSHCHIK 05 and FLAGMAN) maintained close proximity (min 291m, avg 293m) for 116 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Sakhalin South Approach, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness15/25Min distance 291m, avg 293m
Duration20/25Duration 116 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±1m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Sakhalin South Approach

🛰️ Satellite Corroboration

✗ SAR Not Available

No satellite imagery for this time/location

No Sentinel-1 scenes covering AOI and time window

Searched: 2026-10-28T02:15:04.411087+00:00

Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273439180,
        "imo": 8930744,
        "name": "ZAPRAVSHCHIK 05",
        "flag": "Russia"
    },
    "vessel_b": {
        "mmsi": 273443820,
        "imo": 8135215,
        "name": "FLAGMAN",
        "flag": "Russia"
    },
    "min_distance_m": 291.30000000000001136868377216160297393798828125,
    "avg_distance_m": 292.69999999999998863131622783839702606201171875,
    "distance_consistency_m": 1.100000000000000088817841970012523233890533447265625,
    "duration_minutes": 116,
    "overlap_duration_s": 6958,
    "speed_a_avg": 0,
    "speed_a_std": 0,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0,
            "max_sog": 0
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-10-27T21:14:51+00:00",
        "end": "2026-10-27T23:10:49+00:00"
    },
    "points_count": {
        "vessel_a": 8,
        "vessel_b": 8
    },
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "score": {
        "value": 80,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 291m, avg 293m"
            },
            "duration": {
                "score": 20,
                "max": 25,
                "detail": "Duration 116 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b11m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Sakhalin South Approach"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (ZAPRAVSHCHIK 05 and FLAGMAN) maintained close proximity (min 291m, avg 293m) for 116 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Sakhalin South Approach, a known STS activity area."
    },
    "sar": {
        "status": "not_found",
        "centroid": {
            "lat": 46.6248087999999967223629937507212162017822265625,
            "lon": 142.767539599999992105949786491692066192626953125
        },
        "time_window": {
            "start_ts": "2026-10-27T21:14:51+00:00",
            "end_ts": "2026-10-27T23:10:49+00:00"
        },
        "searched_at": "2026-10-28T02:15:04.411087+00:00",
        "notes": "No Sentinel-1 scenes covering AOI and time window"
    }
}
Methodology: 2026.01.18
Sts Prigorodnoye/Sakhalin LNG
Oct 27, 2026 21:07 UTC 88/100 ▼
Vessel A: IMO 8135215 (FLAGMAN) Russia
Vessel B: IMO 9084401 (AZOV) Russia
  • Minimum Distance: 7 meters
  • Average Distance: 128 meters
  • Duration: 5 hours
  • Period: 2026-10-27T21:26:03+00:00 to 2026-10-28T02:26:06+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Prigorodnoye/Sakhalin LNG

Confidence Analysis

Score: 88/100

High-confidence STS candidate. Two tankers (FLAGMAN and AZOV) maintained close proximity (min 7m, avg 128m) for 300 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). Moderate distance variation observed during the encounter. Event occurred in Prigorodnoye/Sakhalin LNG, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness25/25Min distance 7m, avg 128m
Duration25/25Duration 300 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency8/15Distance variance ±83m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Prigorodnoye/Sakhalin LNG
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273443820,
        "imo": 8135215,
        "name": "FLAGMAN",
        "flag": "Russia"
    },
    "vessel_b": {
        "mmsi": 273456730,
        "imo": 9084401,
        "name": "AZOV",
        "flag": "Russia"
    },
    "min_distance_m": 7.0999999999999996447286321199499070644378662109375,
    "avg_distance_m": 128.19999999999998863131622783839702606201171875,
    "distance_consistency_m": 83,
    "duration_minutes": 300.1000000000000227373675443232059478759765625,
    "overlap_duration_s": 18003,
    "speed_a_avg": 0.01000000000000000020816681711721685132943093776702880859375,
    "speed_a_std": 0.0299999999999999988897769753748434595763683319091796875,
    "speed_b_avg": 0.0200000000000000004163336342344337026588618755340576171875,
    "speed_b_std": 0.05000000000000000277555756156289135105907917022705078125,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.01000000000000000020816681711721685132943093776702880859375,
            "max_sog": 0.1000000000000000055511151231257827021181583404541015625
        },
        "vessel_b": {
            "avg_sog": 0.0200000000000000004163336342344337026588618755340576171875,
            "max_sog": 0.200000000000000011102230246251565404236316680908203125
        }
    },
    "time_window": {
        "start": "2026-10-27T21:26:03+00:00",
        "end": "2026-10-28T02:26:06+00:00"
    },
    "points_count": {
        "vessel_a": 19,
        "vessel_b": 19
    },
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "score": {
        "value": 88,
        "components": {
            "distance_tightness": {
                "score": 25,
                "max": 25,
                "detail": "Min distance 7m, avg 128m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 300 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 8,
                "max": 15,
                "detail": "Distance variance \u00b183m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Prigorodnoye\/Sakhalin LNG"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (FLAGMAN and AZOV) maintained close proximity (min 7m, avg 128m) for 300 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). Moderate distance variation observed during the encounter. Event occurred in Prigorodnoye\/Sakhalin LNG, a known STS activity area."
    }
}
Methodology: 2026.01.18
Sts Sakhalin South Approach
Oct 27, 2026 21:07 UTC 88/100 ▼
Vessel A: IMO 8135215 (FLAGMAN) Russia
Vessel B: IMO 9084401 (AZOV) Russia
  • Minimum Distance: 7 meters
  • Average Distance: 128 meters
  • Duration: 5 hours
  • Period: 2026-10-27T21:26:03+00:00 to 2026-10-28T02:26:06+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Sakhalin South Approach

Confidence Analysis

Score: 88/100

High-confidence STS candidate. Two tankers (FLAGMAN and AZOV) maintained close proximity (min 7m, avg 128m) for 300 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). Moderate distance variation observed during the encounter. Event occurred in Sakhalin South Approach, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness25/25Min distance 7m, avg 128m
Duration25/25Duration 300 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency8/15Distance variance ±83m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Sakhalin South Approach
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273443820,
        "imo": 8135215,
        "name": "FLAGMAN",
        "flag": "Russia"
    },
    "vessel_b": {
        "mmsi": 273456730,
        "imo": 9084401,
        "name": "AZOV",
        "flag": "Russia"
    },
    "min_distance_m": 7.0999999999999996447286321199499070644378662109375,
    "avg_distance_m": 128.19999999999998863131622783839702606201171875,
    "distance_consistency_m": 83,
    "duration_minutes": 300.1000000000000227373675443232059478759765625,
    "overlap_duration_s": 18003,
    "speed_a_avg": 0.01000000000000000020816681711721685132943093776702880859375,
    "speed_a_std": 0.0299999999999999988897769753748434595763683319091796875,
    "speed_b_avg": 0.0200000000000000004163336342344337026588618755340576171875,
    "speed_b_std": 0.05000000000000000277555756156289135105907917022705078125,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.01000000000000000020816681711721685132943093776702880859375,
            "max_sog": 0.1000000000000000055511151231257827021181583404541015625
        },
        "vessel_b": {
            "avg_sog": 0.0200000000000000004163336342344337026588618755340576171875,
            "max_sog": 0.200000000000000011102230246251565404236316680908203125
        }
    },
    "time_window": {
        "start": "2026-10-27T21:26:03+00:00",
        "end": "2026-10-28T02:26:06+00:00"
    },
    "points_count": {
        "vessel_a": 19,
        "vessel_b": 19
    },
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "score": {
        "value": 88,
        "components": {
            "distance_tightness": {
                "score": 25,
                "max": 25,
                "detail": "Min distance 7m, avg 128m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 300 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 8,
                "max": 15,
                "detail": "Distance variance \u00b183m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Sakhalin South Approach"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (FLAGMAN and AZOV) maintained close proximity (min 7m, avg 128m) for 300 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). Moderate distance variation observed during the encounter. Event occurred in Sakhalin South Approach, a known STS activity area."
    }
}
Methodology: 2026.01.18
Zone Dwell Prigorodnoye/Sakhalin LNG
Oct 27, 2026 20:05 UTC 80.0% ▼
  • Zone: Prigorodnoye/Sakhalin LNG
  • Duration: 6h 21m
  • Data Points: 21 AIS positions
  • Period: 2026-10-27T20:05:03+00:00 to 2026-10-28T02:26:06+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "dwell_minutes": 381.1000000000000227373675443232059478759765625,
    "points_in_zone": 21,
    "first_point": {
        "ts": "2026-10-27T20:05:03+00:00",
        "lat": 46.62413169999999951187419355846941471099853515625,
        "lon": 142.769153299999999262581695802509784698486328125
    },
    "last_point": {
        "ts": "2026-10-28T02:26:06+00:00",
        "lat": 46.62408330000000233894752454943954944610595703125,
        "lon": 142.7691317000000026382622309029102325439453125
    }
}
Methodology: 2026.01.18
Zone Dwell Sakhalin South Approach
Oct 27, 2026 20:05 UTC 80.0% ▼
  • Zone: Sakhalin South Approach
  • Duration: 6h 21m
  • Data Points: 21 AIS positions
  • Period: 2026-10-27T20:05:03+00:00 to 2026-10-28T02:26:06+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "dwell_minutes": 381.1000000000000227373675443232059478759765625,
    "points_in_zone": 21,
    "first_point": {
        "ts": "2026-10-27T20:05:03+00:00",
        "lat": 46.62413169999999951187419355846941471099853515625,
        "lon": 142.769153299999999262581695802509784698486328125
    },
    "last_point": {
        "ts": "2026-10-28T02:26:06+00:00",
        "lat": 46.62408330000000233894752454943954944610595703125,
        "lon": 142.7691317000000026382622309029102325439453125
    }
}
Methodology: 2026.01.18
Loiter Prigorodnoye/Sakhalin LNG
Oct 27, 2026 20:05 UTC 75.0% ▼
  • Duration: 6h 21m
  • Radius: 7 meters
  • Data Points: 21 AIS positions
  • Centroid: 46.6241, 142.7691
  • Zone: Prigorodnoye/Sakhalin LNG
Show Raw Evidence JSON
{
    "radius_m": 7.29999999999999982236431605997495353221893310546875,
    "duration_minutes": 381.1000000000000227373675443232059478759765625,
    "points": 21,
    "centroid": {
        "lat": 46.62407215714285513286085915751755237579345703125,
        "lon": 142.769113185714246583302156068384647369384765625
    },
    "bbox": {
        "min_lat": 46.6240499999999968849806464277207851409912109375,
        "min_lon": 142.769083300000005465335561893880367279052734375,
        "max_lat": 46.62413169999999951187419355846941471099853515625,
        "max_lon": 142.769153299999999262581695802509784698486328125
    },
    "zone_id": "russia_prigorodnoye"
}
Methodology: 2026.01.18
Loiter Sakhalin South Approach
Oct 27, 2026 20:05 UTC 75.0% ▼
  • Duration: 6h 21m
  • Radius: 7 meters
  • Data Points: 21 AIS positions
  • Centroid: 46.6241, 142.7691
  • Zone: Sakhalin South Approach
Show Raw Evidence JSON
{
    "radius_m": 7.29999999999999982236431605997495353221893310546875,
    "duration_minutes": 381.1000000000000227373675443232059478759765625,
    "points": 21,
    "centroid": {
        "lat": 46.62407215714285513286085915751755237579345703125,
        "lon": 142.769113185714246583302156068384647369384765625
    },
    "bbox": {
        "min_lat": 46.6240499999999968849806464277207851409912109375,
        "min_lon": 142.769083300000005465335561893880367279052734375,
        "max_lat": 46.62413169999999951187419355846941471099853515625,
        "max_lon": 142.769153299999999262581695802509784698486328125
    },
    "zone_id": "russia_sakhalin_south"
}
Methodology: 2026.01.18
Sts Prigorodnoye/Sakhalin LNG
Oct 27, 2026 19:38 UTC 85/100 ▼
Vessel A: IMO 8135215 (FLAGMAN) Russia
Vessel B: IMO 8930744 (ZAPRAVSHCHIK 05) Russia
  • Minimum Distance: 289 meters
  • Average Distance: 291 meters
  • Duration: 2h 27m
  • Period: 2026-10-27T19:38:02+00:00 to 2026-10-27T22:05:04+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Prigorodnoye/Sakhalin LNG

Confidence Analysis

Score: 85/100

High-confidence STS candidate. Two tankers (FLAGMAN and ZAPRAVSHCHIK 05) maintained close proximity (min 288m, avg 291m) for 147 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Prigorodnoye/Sakhalin LNG, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness15/25Min distance 288m, avg 291m
Duration25/25Duration 147 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±2m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Prigorodnoye/Sakhalin LNG
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273443820,
        "imo": 8135215,
        "name": "FLAGMAN",
        "flag": "Russia"
    },
    "vessel_b": {
        "mmsi": 273439180,
        "imo": 8930744,
        "name": "ZAPRAVSHCHIK 05",
        "flag": "Russia"
    },
    "min_distance_m": 288.5,
    "avg_distance_m": 291.3999999999999772626324556767940521240234375,
    "distance_consistency_m": 1.6999999999999999555910790149937383830547332763671875,
    "duration_minutes": 147,
    "overlap_duration_s": 8822,
    "speed_a_avg": 0.01000000000000000020816681711721685132943093776702880859375,
    "speed_a_std": 0.040000000000000000832667268468867405317723751068115234375,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.01000000000000000020816681711721685132943093776702880859375,
            "max_sog": 0.1000000000000000055511151231257827021181583404541015625
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-10-27T19:38:02+00:00",
        "end": "2026-10-27T22:05:04+00:00"
    },
    "points_count": {
        "vessel_a": 8,
        "vessel_b": 8
    },
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "score": {
        "value": 85,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 288m, avg 291m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 147 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b12m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Prigorodnoye\/Sakhalin LNG"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (FLAGMAN and ZAPRAVSHCHIK 05) maintained close proximity (min 288m, avg 291m) for 147 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Prigorodnoye\/Sakhalin LNG, a known STS activity area."
    }
}
Methodology: 2026.01.18
Sts Sakhalin South Approach
Oct 27, 2026 19:38 UTC 85/100 ▼
Vessel A: IMO 8135215 (FLAGMAN) Russia
Vessel B: IMO 8930744 (ZAPRAVSHCHIK 05) Russia
  • Minimum Distance: 289 meters
  • Average Distance: 291 meters
  • Duration: 2h 27m
  • Period: 2026-10-27T19:38:02+00:00 to 2026-10-27T22:05:04+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Sakhalin South Approach

Confidence Analysis

Score: 85/100

High-confidence STS candidate. Two tankers (FLAGMAN and ZAPRAVSHCHIK 05) maintained close proximity (min 288m, avg 291m) for 147 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Sakhalin South Approach, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness15/25Min distance 288m, avg 291m
Duration25/25Duration 147 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±2m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Sakhalin South Approach
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273443820,
        "imo": 8135215,
        "name": "FLAGMAN",
        "flag": "Russia"
    },
    "vessel_b": {
        "mmsi": 273439180,
        "imo": 8930744,
        "name": "ZAPRAVSHCHIK 05",
        "flag": "Russia"
    },
    "min_distance_m": 288.5,
    "avg_distance_m": 291.3999999999999772626324556767940521240234375,
    "distance_consistency_m": 1.6999999999999999555910790149937383830547332763671875,
    "duration_minutes": 147,
    "overlap_duration_s": 8822,
    "speed_a_avg": 0.01000000000000000020816681711721685132943093776702880859375,
    "speed_a_std": 0.040000000000000000832667268468867405317723751068115234375,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.01000000000000000020816681711721685132943093776702880859375,
            "max_sog": 0.1000000000000000055511151231257827021181583404541015625
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-10-27T19:38:02+00:00",
        "end": "2026-10-27T22:05:04+00:00"
    },
    "points_count": {
        "vessel_a": 8,
        "vessel_b": 8
    },
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "score": {
        "value": 85,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 288m, avg 291m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 147 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b12m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Sakhalin South Approach"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (FLAGMAN and ZAPRAVSHCHIK 05) maintained close proximity (min 288m, avg 291m) for 147 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Sakhalin South Approach, a known STS activity area."
    }
}
Methodology: 2026.01.18
Sts Prigorodnoye/Sakhalin LNG
Oct 27, 2026 19:16 UTC 88/100 ▼
Vessel A: IMO 8135215 (FLAGMAN) Russia
Vessel B: IMO 9084401 (AZOV) Russia
  • Minimum Distance: 7 meters
  • Average Distance: 92 meters
  • Duration: 6h 18m
  • Period: 2026-10-27T19:38:02+00:00 to 2026-10-28T01:56:06+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Prigorodnoye/Sakhalin LNG

Confidence Analysis

Score: 88/100

High-confidence STS candidate. Two tankers (FLAGMAN and AZOV) maintained close proximity (min 7m, avg 92m) for 378 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). Moderate distance variation observed during the encounter. Event occurred in Prigorodnoye/Sakhalin LNG, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness25/25Min distance 7m, avg 92m
Duration25/25Duration 378 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency8/15Distance variance ±87m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Prigorodnoye/Sakhalin LNG
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273443820,
        "imo": 8135215,
        "name": "FLAGMAN",
        "flag": "Russia"
    },
    "vessel_b": {
        "mmsi": 273456730,
        "imo": 9084401,
        "name": "AZOV",
        "flag": "Russia"
    },
    "min_distance_m": 7.0999999999999996447286321199499070644378662109375,
    "avg_distance_m": 92.2999999999999971578290569595992565155029296875,
    "distance_consistency_m": 86.599999999999994315658113919198513031005859375,
    "duration_minutes": 378.1000000000000227373675443232059478759765625,
    "overlap_duration_s": 22684,
    "speed_a_avg": 0.01000000000000000020816681711721685132943093776702880859375,
    "speed_a_std": 0.0299999999999999988897769753748434595763683319091796875,
    "speed_b_avg": 0.0200000000000000004163336342344337026588618755340576171875,
    "speed_b_std": 0.05000000000000000277555756156289135105907917022705078125,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.01000000000000000020816681711721685132943093776702880859375,
            "max_sog": 0.1000000000000000055511151231257827021181583404541015625
        },
        "vessel_b": {
            "avg_sog": 0.0200000000000000004163336342344337026588618755340576171875,
            "max_sog": 0.200000000000000011102230246251565404236316680908203125
        }
    },
    "time_window": {
        "start": "2026-10-27T19:38:02+00:00",
        "end": "2026-10-28T01:56:06+00:00"
    },
    "points_count": {
        "vessel_a": 19,
        "vessel_b": 19
    },
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "score": {
        "value": 88,
        "components": {
            "distance_tightness": {
                "score": 25,
                "max": 25,
                "detail": "Min distance 7m, avg 92m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 378 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 8,
                "max": 15,
                "detail": "Distance variance \u00b187m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Prigorodnoye\/Sakhalin LNG"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (FLAGMAN and AZOV) maintained close proximity (min 7m, avg 92m) for 378 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). Moderate distance variation observed during the encounter. Event occurred in Prigorodnoye\/Sakhalin LNG, a known STS activity area."
    }
}
Methodology: 2026.01.18
Sts Sakhalin South Approach
Oct 27, 2026 19:16 UTC 88/100 ▼
Vessel A: IMO 8135215 (FLAGMAN) Russia
Vessel B: IMO 9084401 (AZOV) Russia
  • Minimum Distance: 7 meters
  • Average Distance: 92 meters
  • Duration: 6h 18m
  • Period: 2026-10-27T19:38:02+00:00 to 2026-10-28T01:56:06+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Sakhalin South Approach

Confidence Analysis

Score: 88/100

High-confidence STS candidate. Two tankers (FLAGMAN and AZOV) maintained close proximity (min 7m, avg 92m) for 378 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). Moderate distance variation observed during the encounter. Event occurred in Sakhalin South Approach, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness25/25Min distance 7m, avg 92m
Duration25/25Duration 378 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency8/15Distance variance ±87m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Sakhalin South Approach
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273443820,
        "imo": 8135215,
        "name": "FLAGMAN",
        "flag": "Russia"
    },
    "vessel_b": {
        "mmsi": 273456730,
        "imo": 9084401,
        "name": "AZOV",
        "flag": "Russia"
    },
    "min_distance_m": 7.0999999999999996447286321199499070644378662109375,
    "avg_distance_m": 92.2999999999999971578290569595992565155029296875,
    "distance_consistency_m": 86.599999999999994315658113919198513031005859375,
    "duration_minutes": 378.1000000000000227373675443232059478759765625,
    "overlap_duration_s": 22684,
    "speed_a_avg": 0.01000000000000000020816681711721685132943093776702880859375,
    "speed_a_std": 0.0299999999999999988897769753748434595763683319091796875,
    "speed_b_avg": 0.0200000000000000004163336342344337026588618755340576171875,
    "speed_b_std": 0.05000000000000000277555756156289135105907917022705078125,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.01000000000000000020816681711721685132943093776702880859375,
            "max_sog": 0.1000000000000000055511151231257827021181583404541015625
        },
        "vessel_b": {
            "avg_sog": 0.0200000000000000004163336342344337026588618755340576171875,
            "max_sog": 0.200000000000000011102230246251565404236316680908203125
        }
    },
    "time_window": {
        "start": "2026-10-27T19:38:02+00:00",
        "end": "2026-10-28T01:56:06+00:00"
    },
    "points_count": {
        "vessel_a": 19,
        "vessel_b": 19
    },
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "score": {
        "value": 88,
        "components": {
            "distance_tightness": {
                "score": 25,
                "max": 25,
                "detail": "Min distance 7m, avg 92m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 378 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 8,
                "max": 15,
                "detail": "Distance variance \u00b187m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Sakhalin South Approach"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (FLAGMAN and AZOV) maintained close proximity (min 7m, avg 92m) for 378 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). Moderate distance variation observed during the encounter. Event occurred in Sakhalin South Approach, a known STS activity area."
    }
}
Methodology: 2026.01.18
Zone Dwell Prigorodnoye/Sakhalin LNG
Oct 27, 2026 19:06 UTC 80.0% ▼
  • Zone: Prigorodnoye/Sakhalin LNG
  • Duration: 6h 33m
  • Data Points: 21 AIS positions
  • Period: 2026-10-27T19:44:03+00:00 to 2026-10-28T02:17:06+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "dwell_minutes": 393.1000000000000227373675443232059478759765625,
    "points_in_zone": 21,
    "first_point": {
        "ts": "2026-10-27T19:44:03+00:00",
        "lat": 46.624144999999998617568053305149078369140625,
        "lon": 142.76912329999998974017216823995113372802734375
    },
    "last_point": {
        "ts": "2026-10-28T02:17:06+00:00",
        "lat": 46.6240667000000001962689566425979137420654296875,
        "lon": 142.769116700000012087912182323634624481201171875
    }
}
Methodology: 2026.01.18
Zone Dwell Sakhalin South Approach
Oct 27, 2026 19:06 UTC 80.0% ▼
  • Zone: Sakhalin South Approach
  • Duration: 6h 33m
  • Data Points: 21 AIS positions
  • Period: 2026-10-27T19:44:03+00:00 to 2026-10-28T02:17:06+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "dwell_minutes": 393.1000000000000227373675443232059478759765625,
    "points_in_zone": 21,
    "first_point": {
        "ts": "2026-10-27T19:44:03+00:00",
        "lat": 46.624144999999998617568053305149078369140625,
        "lon": 142.76912329999998974017216823995113372802734375
    },
    "last_point": {
        "ts": "2026-10-28T02:17:06+00:00",
        "lat": 46.6240667000000001962689566425979137420654296875,
        "lon": 142.769116700000012087912182323634624481201171875
    }
}
Methodology: 2026.01.18
Loiter Prigorodnoye/Sakhalin LNG
Oct 27, 2026 19:06 UTC 75.0% ▼
  • Duration: 6h 33m
  • Radius: 8 meters
  • Data Points: 21 AIS positions
  • Centroid: 46.6241, 142.7691
  • Zone: Prigorodnoye/Sakhalin LNG
Show Raw Evidence JSON
{
    "radius_m": 7.79999999999999982236431605997495353221893310546875,
    "duration_minutes": 393.1000000000000227373675443232059478759765625,
    "points": 21,
    "centroid": {
        "lat": 46.62407509523809068241462227888405323028564453125,
        "lon": 142.76911278571429875228204764425754547119140625
    },
    "bbox": {
        "min_lat": 46.6240499999999968849806464277207851409912109375,
        "min_lon": 142.769083300000005465335561893880367279052734375,
        "max_lat": 46.624144999999998617568053305149078369140625,
        "max_lon": 142.769153299999999262581695802509784698486328125
    },
    "zone_id": "russia_prigorodnoye"
}
Methodology: 2026.01.18
Loiter Sakhalin South Approach
Oct 27, 2026 19:06 UTC 75.0% ▼
  • Duration: 6h 33m
  • Radius: 8 meters
  • Data Points: 21 AIS positions
  • Centroid: 46.6241, 142.7691
  • Zone: Sakhalin South Approach
Show Raw Evidence JSON
{
    "radius_m": 7.79999999999999982236431605997495353221893310546875,
    "duration_minutes": 393.1000000000000227373675443232059478759765625,
    "points": 21,
    "centroid": {
        "lat": 46.62407509523809068241462227888405323028564453125,
        "lon": 142.76911278571429875228204764425754547119140625
    },
    "bbox": {
        "min_lat": 46.6240499999999968849806464277207851409912109375,
        "min_lon": 142.769083300000005465335561893880367279052734375,
        "max_lat": 46.624144999999998617568053305149078369140625,
        "max_lon": 142.769153299999999262581695802509784698486328125
    },
    "zone_id": "russia_sakhalin_south"
}
Methodology: 2026.01.18
Sts🛰️? Prigorodnoye/Sakhalin LNG
Oct 27, 2026 10:49 UTC 70/100 ▼
Vessel A: IMO 8930744 (ZAPRAVSHCHIK 05) Russia
Vessel B: IMO 8135215 (FLAGMAN) Russia
  • Minimum Distance: 292 meters
  • Average Distance: 293 meters
  • Duration: 56 minutes
  • Period: 2026-10-27T10:49:49+00:00 to 2026-10-27T11:45:47+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Prigorodnoye/Sakhalin LNG

Confidence Analysis

Score: 70/100

Moderate-confidence STS candidate. Two tankers (ZAPRAVSHCHIK 05 and FLAGMAN) maintained close proximity (min 292m, avg 293m) for 56 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Prigorodnoye/Sakhalin LNG, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness15/25Min distance 292m, avg 293m
Duration10/25Duration 56 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±1m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Prigorodnoye/Sakhalin LNG

🛰️ Satellite Corroboration

? SAR Inconclusive

Satellite imagery available but requires review

Preview available for manual review

Scene: S1C_IW_GRDH_1SDV_20261027T081918_20261027T081955_010068_01418C_959E_COG • Acquired: 2026-10-27T08:19:18.858484Z • Platform: sentinel-1c
SAR satellite preview for event 1581524

Click image to view full size

Searched: 2026-10-27T13:00:01.446436+00:00

Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273439180,
        "imo": 8930744,
        "name": "ZAPRAVSHCHIK 05",
        "flag": "Russia"
    },
    "vessel_b": {
        "mmsi": 273443820,
        "imo": 8135215,
        "name": "FLAGMAN",
        "flag": "Russia"
    },
    "min_distance_m": 292.30000000000001136868377216160297393798828125,
    "avg_distance_m": 293,
    "distance_consistency_m": 0.59999999999999997779553950749686919152736663818359375,
    "duration_minutes": 56,
    "overlap_duration_s": 3358,
    "speed_a_avg": 0,
    "speed_a_std": 0,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0,
            "max_sog": 0
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-10-27T10:49:49+00:00",
        "end": "2026-10-27T11:45:47+00:00"
    },
    "points_count": {
        "vessel_a": 3,
        "vessel_b": 3
    },
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "score": {
        "value": 70,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 292m, avg 293m"
            },
            "duration": {
                "score": 10,
                "max": 25,
                "detail": "Duration 56 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b11m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Prigorodnoye\/Sakhalin LNG"
            }
        },
        "summary": "Moderate-confidence STS candidate. Two tankers (ZAPRAVSHCHIK 05 and FLAGMAN) maintained close proximity (min 292m, avg 293m) for 56 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Prigorodnoye\/Sakhalin LNG, a known STS activity area."
    },
    "sar": {
        "status": "inconclusive",
        "centroid": {
            "lat": 46.6248097000000001344233169220387935638427734375,
            "lon": 142.767546699999996917540556751191616058349609375
        },
        "time_window": {
            "start_ts": "2026-10-27T10:49:49+00:00",
            "end_ts": "2026-10-27T11:45:47+00:00"
        },
        "searched_at": "2026-10-27T13:00:01.446436+00:00",
        "scene_id": "S1C_IW_GRDH_1SDV_20261027T081918_20261027T081955_010068_01418C_959E_COG",
        "scene_datetime": "2026-10-27T08:19:18.858484Z",
        "platform": "sentinel-1c",
        "bbox": {
            "min_lon": 141.228850999999991699951351620256900787353515625,
            "min_lat": 44.51316800000000029058355721645057201385498046875,
            "max_lon": 144.993438999999995075995684601366519927978515625,
            "max_lat": 47.07320399999999693818608648143708705902099609375
        },
        "assets": {
            "preview_url": "https:\/\/fleetleaks.com\/wp-content\/uploads\/fleetleaks-evidence\/sar-imagery\/2026\/10\/event_1581524_thumbnail_20261027130005.png",
            "stored_path": "\/home\/fleetleaks\/public_html\/wp-content\/uploads\/fleetleaks-evidence\/sar-imagery\/2026\/10\/event_1581524_thumbnail_20261027130005.png",
            "source": "copernicus_dataspace"
        },
        "notes": "Preview available for manual review"
    }
}
Methodology: 2026.01.18
Sts🛰️? Sakhalin South Approach
Oct 27, 2026 10:49 UTC 70/100 ▼
Vessel A: IMO 8930744 (ZAPRAVSHCHIK 05) Russia
Vessel B: IMO 8135215 (FLAGMAN) Russia
  • Minimum Distance: 292 meters
  • Average Distance: 293 meters
  • Duration: 56 minutes
  • Period: 2026-10-27T10:49:49+00:00 to 2026-10-27T11:45:47+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Sakhalin South Approach

Confidence Analysis

Score: 70/100

Moderate-confidence STS candidate. Two tankers (ZAPRAVSHCHIK 05 and FLAGMAN) maintained close proximity (min 292m, avg 293m) for 56 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Sakhalin South Approach, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness15/25Min distance 292m, avg 293m
Duration10/25Duration 56 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±1m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Sakhalin South Approach

🛰️ Satellite Corroboration

? SAR Inconclusive

Satellite imagery available but requires review

Preview available for manual review

Scene: S1C_IW_GRDH_1SDV_20261027T081918_20261027T081955_010068_01418C_959E_COG • Acquired: 2026-10-27T08:19:18.858484Z • Platform: sentinel-1c
SAR satellite preview for event 1581525

Click image to view full size

Searched: 2026-10-27T13:00:06.804112+00:00

Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273439180,
        "imo": 8930744,
        "name": "ZAPRAVSHCHIK 05",
        "flag": "Russia"
    },
    "vessel_b": {
        "mmsi": 273443820,
        "imo": 8135215,
        "name": "FLAGMAN",
        "flag": "Russia"
    },
    "min_distance_m": 292.30000000000001136868377216160297393798828125,
    "avg_distance_m": 293,
    "distance_consistency_m": 0.59999999999999997779553950749686919152736663818359375,
    "duration_minutes": 56,
    "overlap_duration_s": 3358,
    "speed_a_avg": 0,
    "speed_a_std": 0,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0,
            "max_sog": 0
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-10-27T10:49:49+00:00",
        "end": "2026-10-27T11:45:47+00:00"
    },
    "points_count": {
        "vessel_a": 3,
        "vessel_b": 3
    },
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "score": {
        "value": 70,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 292m, avg 293m"
            },
            "duration": {
                "score": 10,
                "max": 25,
                "detail": "Duration 56 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b11m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Sakhalin South Approach"
            }
        },
        "summary": "Moderate-confidence STS candidate. Two tankers (ZAPRAVSHCHIK 05 and FLAGMAN) maintained close proximity (min 292m, avg 293m) for 56 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Sakhalin South Approach, a known STS activity area."
    },
    "sar": {
        "status": "inconclusive",
        "centroid": {
            "lat": 46.6248097000000001344233169220387935638427734375,
            "lon": 142.767546699999996917540556751191616058349609375
        },
        "time_window": {
            "start_ts": "2026-10-27T10:49:49+00:00",
            "end_ts": "2026-10-27T11:45:47+00:00"
        },
        "searched_at": "2026-10-27T13:00:06.804112+00:00",
        "scene_id": "S1C_IW_GRDH_1SDV_20261027T081918_20261027T081955_010068_01418C_959E_COG",
        "scene_datetime": "2026-10-27T08:19:18.858484Z",
        "platform": "sentinel-1c",
        "bbox": {
            "min_lon": 141.228850999999991699951351620256900787353515625,
            "min_lat": 44.51316800000000029058355721645057201385498046875,
            "max_lon": 144.993438999999995075995684601366519927978515625,
            "max_lat": 47.07320399999999693818608648143708705902099609375
        },
        "assets": {
            "preview_url": "https:\/\/fleetleaks.com\/wp-content\/uploads\/fleetleaks-evidence\/sar-imagery\/2026\/10\/event_1581525_thumbnail_20261027130010.png",
            "stored_path": "\/home\/fleetleaks\/public_html\/wp-content\/uploads\/fleetleaks-evidence\/sar-imagery\/2026\/10\/event_1581525_thumbnail_20261027130010.png",
            "source": "copernicus_dataspace"
        },
        "notes": "Preview available for manual review"
    }
}
Methodology: 2026.01.18
Zone Dwell Sakhalin South Approach
Oct 27, 2026 10:09 UTC 80.0% ▼
  • Zone: Sakhalin South Approach
  • Duration: 1h 54m
  • Data Points: 5 AIS positions
  • Period: 2026-10-27T10:09:57+00:00 to 2026-10-27T12:03:58+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "dwell_minutes": 114,
    "points_in_zone": 5,
    "first_point": {
        "ts": "2026-10-27T10:09:57+00:00",
        "lat": 46.6240667000000001962689566425979137420654296875,
        "lon": 142.769116700000012087912182323634624481201171875
    },
    "last_point": {
        "ts": "2026-10-27T12:03:58+00:00",
        "lat": 46.6240499999999968849806464277207851409912109375,
        "lon": 142.7691317000000026382622309029102325439453125
    }
}
Methodology: 2026.01.18
Zone Dwell Prigorodnoye/Sakhalin LNG
Oct 27, 2026 10:09 UTC 80.0% ▼
  • Zone: Prigorodnoye/Sakhalin LNG
  • Duration: 1h 54m
  • Data Points: 5 AIS positions
  • Period: 2026-10-27T10:09:57+00:00 to 2026-10-27T12:03:58+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "dwell_minutes": 114,
    "points_in_zone": 5,
    "first_point": {
        "ts": "2026-10-27T10:09:57+00:00",
        "lat": 46.6240667000000001962689566425979137420654296875,
        "lon": 142.769116700000012087912182323634624481201171875
    },
    "last_point": {
        "ts": "2026-10-27T12:03:58+00:00",
        "lat": 46.6240499999999968849806464277207851409912109375,
        "lon": 142.7691317000000026382622309029102325439453125
    }
}
Methodology: 2026.01.18
Sts Prigorodnoye/Sakhalin LNG
Oct 27, 2026 09:46 UTC 80/100 ▼
Vessel A: IMO 8135215 (FLAGMAN) Russia
Vessel B: IMO 8930744 (ZAPRAVSHCHIK 05) Russia
  • Minimum Distance: 289 meters
  • Average Distance: 292 meters
  • Duration: 1h 57m
  • Period: 2026-10-27T09:45:57+00:00 to 2026-10-27T11:42:57+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Prigorodnoye/Sakhalin LNG

Confidence Analysis

Score: 80/100

High-confidence STS candidate. Two tankers (FLAGMAN and ZAPRAVSHCHIK 05) maintained close proximity (min 289m, avg 292m) for 117 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Prigorodnoye/Sakhalin LNG, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness15/25Min distance 289m, avg 292m
Duration20/25Duration 117 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±2m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Prigorodnoye/Sakhalin LNG
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273443820,
        "imo": 8135215,
        "name": "FLAGMAN",
        "flag": "Russia"
    },
    "vessel_b": {
        "mmsi": 273439180,
        "imo": 8930744,
        "name": "ZAPRAVSHCHIK 05",
        "flag": "Russia"
    },
    "min_distance_m": 289.19999999999998863131622783839702606201171875,
    "avg_distance_m": 292.1000000000000227373675443232059478759765625,
    "distance_consistency_m": 1.6999999999999999555910790149937383830547332763671875,
    "duration_minutes": 117,
    "overlap_duration_s": 7020,
    "speed_a_avg": 0,
    "speed_a_std": 0,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0,
            "max_sog": 0
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-10-27T09:45:57+00:00",
        "end": "2026-10-27T11:42:57+00:00"
    },
    "points_count": {
        "vessel_a": 5,
        "vessel_b": 5
    },
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "score": {
        "value": 80,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 289m, avg 292m"
            },
            "duration": {
                "score": 20,
                "max": 25,
                "detail": "Duration 117 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b12m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Prigorodnoye\/Sakhalin LNG"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (FLAGMAN and ZAPRAVSHCHIK 05) maintained close proximity (min 289m, avg 292m) for 117 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Prigorodnoye\/Sakhalin LNG, a known STS activity area."
    }
}
Methodology: 2026.01.18
Sts Sakhalin South Approach
Oct 27, 2026 09:46 UTC 80/100 ▼
Vessel A: IMO 8135215 (FLAGMAN) Russia
Vessel B: IMO 8930744 (ZAPRAVSHCHIK 05) Russia
  • Minimum Distance: 289 meters
  • Average Distance: 292 meters
  • Duration: 1h 57m
  • Period: 2026-10-27T09:45:57+00:00 to 2026-10-27T11:42:57+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Sakhalin South Approach

Confidence Analysis

Score: 80/100

High-confidence STS candidate. Two tankers (FLAGMAN and ZAPRAVSHCHIK 05) maintained close proximity (min 289m, avg 292m) for 117 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Sakhalin South Approach, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness15/25Min distance 289m, avg 292m
Duration20/25Duration 117 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±2m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Sakhalin South Approach
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273443820,
        "imo": 8135215,
        "name": "FLAGMAN",
        "flag": "Russia"
    },
    "vessel_b": {
        "mmsi": 273439180,
        "imo": 8930744,
        "name": "ZAPRAVSHCHIK 05",
        "flag": "Russia"
    },
    "min_distance_m": 289.19999999999998863131622783839702606201171875,
    "avg_distance_m": 292.1000000000000227373675443232059478759765625,
    "distance_consistency_m": 1.6999999999999999555910790149937383830547332763671875,
    "duration_minutes": 117,
    "overlap_duration_s": 7020,
    "speed_a_avg": 0,
    "speed_a_std": 0,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0,
            "max_sog": 0
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-10-27T09:45:57+00:00",
        "end": "2026-10-27T11:42:57+00:00"
    },
    "points_count": {
        "vessel_a": 5,
        "vessel_b": 5
    },
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "score": {
        "value": 80,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 289m, avg 292m"
            },
            "duration": {
                "score": 20,
                "max": 25,
                "detail": "Duration 117 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b12m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Sakhalin South Approach"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (FLAGMAN and ZAPRAVSHCHIK 05) maintained close proximity (min 289m, avg 292m) for 117 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Sakhalin South Approach, a known STS activity area."
    }
}
Methodology: 2026.01.18
Zone Dwell Sakhalin South Approach
Oct 27, 2026 09:45 UTC 80.0% ▼
  • Zone: Sakhalin South Approach
  • Duration: 2h 18m
  • Data Points: 6 AIS positions
  • Period: 2026-10-27T09:45:57+00:00 to 2026-10-27T12:03:58+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "dwell_minutes": 138,
    "points_in_zone": 6,
    "first_point": {
        "ts": "2026-10-27T09:45:57+00:00",
        "lat": 46.6240499999999968849806464277207851409912109375,
        "lon": 142.769100000000008776623872108757495880126953125
    },
    "last_point": {
        "ts": "2026-10-27T12:03:58+00:00",
        "lat": 46.6240499999999968849806464277207851409912109375,
        "lon": 142.7691317000000026382622309029102325439453125
    }
}
Methodology: 2026.01.18
Zone Dwell Prigorodnoye/Sakhalin LNG
Oct 27, 2026 09:45 UTC 80.0% ▼
  • Zone: Prigorodnoye/Sakhalin LNG
  • Duration: 2h 18m
  • Data Points: 6 AIS positions
  • Period: 2026-10-27T09:45:57+00:00 to 2026-10-27T12:03:58+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "dwell_minutes": 138,
    "points_in_zone": 6,
    "first_point": {
        "ts": "2026-10-27T09:45:57+00:00",
        "lat": 46.6240499999999968849806464277207851409912109375,
        "lon": 142.769100000000008776623872108757495880126953125
    },
    "last_point": {
        "ts": "2026-10-27T12:03:58+00:00",
        "lat": 46.6240499999999968849806464277207851409912109375,
        "lon": 142.7691317000000026382622309029102325439453125
    }
}
Methodology: 2026.01.18
Sts Prigorodnoye/Sakhalin LNG
Oct 27, 2026 09:36 UTC 75/100 ▼
Vessel A: IMO 9084401 (AZOV) Russia
Vessel B: IMO 8135215 (FLAGMAN) Russia
  • Minimum Distance: 10 meters
  • Average Distance: 11 meters
  • Duration: 36 minutes
  • Period: 2026-10-27T09:36:29+00:00 to 2026-10-27T10:12:30+00:00
  • Vessel A Avg Speed: 0.1 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Prigorodnoye/Sakhalin LNG

Confidence Analysis

Score: 75/100

Moderate-confidence STS candidate. Two tankers (AZOV and FLAGMAN) maintained close proximity (min 10m, avg 11m) for 36 minutes. Both vessels were slow-moving (avg speeds 0.1 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Prigorodnoye/Sakhalin LNG, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness25/25Min distance 10m, avg 11m
Duration5/25Duration 36 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±1m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Prigorodnoye/Sakhalin LNG
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273456730,
        "imo": 9084401,
        "name": "AZOV",
        "flag": "Russia"
    },
    "vessel_b": {
        "mmsi": 273443820,
        "imo": 8135215,
        "name": "FLAGMAN",
        "flag": "Russia"
    },
    "min_distance_m": 9.800000000000000710542735760100185871124267578125,
    "avg_distance_m": 10.9000000000000003552713678800500929355621337890625,
    "distance_consistency_m": 0.59999999999999997779553950749686919152736663818359375,
    "duration_minutes": 36,
    "overlap_duration_s": 2161,
    "speed_a_avg": 0.059999999999999997779553950749686919152736663818359375,
    "speed_a_std": 0.05000000000000000277555756156289135105907917022705078125,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.059999999999999997779553950749686919152736663818359375,
            "max_sog": 0.1000000000000000055511151231257827021181583404541015625
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-10-27T09:36:29+00:00",
        "end": "2026-10-27T10:12:30+00:00"
    },
    "points_count": {
        "vessel_a": 8,
        "vessel_b": 8
    },
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "score": {
        "value": 75,
        "components": {
            "distance_tightness": {
                "score": 25,
                "max": 25,
                "detail": "Min distance 10m, avg 11m"
            },
            "duration": {
                "score": 5,
                "max": 25,
                "detail": "Duration 36 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b11m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Prigorodnoye\/Sakhalin LNG"
            }
        },
        "summary": "Moderate-confidence STS candidate. Two tankers (AZOV and FLAGMAN) maintained close proximity (min 10m, avg 11m) for 36 minutes. Both vessels were slow-moving (avg speeds 0.1 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Prigorodnoye\/Sakhalin LNG, a known STS activity area."
    }
}
Methodology: 2026.01.18
Sts Sakhalin South Approach
Oct 27, 2026 09:36 UTC 75/100 ▼
Vessel A: IMO 9084401 (AZOV) Russia
Vessel B: IMO 8135215 (FLAGMAN) Russia
  • Minimum Distance: 10 meters
  • Average Distance: 11 meters
  • Duration: 36 minutes
  • Period: 2026-10-27T09:36:29+00:00 to 2026-10-27T10:12:30+00:00
  • Vessel A Avg Speed: 0.1 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Sakhalin South Approach

Confidence Analysis

Score: 75/100

Moderate-confidence STS candidate. Two tankers (AZOV and FLAGMAN) maintained close proximity (min 10m, avg 11m) for 36 minutes. Both vessels were slow-moving (avg speeds 0.1 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Sakhalin South Approach, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness25/25Min distance 10m, avg 11m
Duration5/25Duration 36 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±1m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Sakhalin South Approach
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273456730,
        "imo": 9084401,
        "name": "AZOV",
        "flag": "Russia"
    },
    "vessel_b": {
        "mmsi": 273443820,
        "imo": 8135215,
        "name": "FLAGMAN",
        "flag": "Russia"
    },
    "min_distance_m": 9.800000000000000710542735760100185871124267578125,
    "avg_distance_m": 10.9000000000000003552713678800500929355621337890625,
    "distance_consistency_m": 0.59999999999999997779553950749686919152736663818359375,
    "duration_minutes": 36,
    "overlap_duration_s": 2161,
    "speed_a_avg": 0.059999999999999997779553950749686919152736663818359375,
    "speed_a_std": 0.05000000000000000277555756156289135105907917022705078125,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.059999999999999997779553950749686919152736663818359375,
            "max_sog": 0.1000000000000000055511151231257827021181583404541015625
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-10-27T09:36:29+00:00",
        "end": "2026-10-27T10:12:30+00:00"
    },
    "points_count": {
        "vessel_a": 8,
        "vessel_b": 8
    },
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "score": {
        "value": 75,
        "components": {
            "distance_tightness": {
                "score": 25,
                "max": 25,
                "detail": "Min distance 10m, avg 11m"
            },
            "duration": {
                "score": 5,
                "max": 25,
                "detail": "Duration 36 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b11m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Sakhalin South Approach"
            }
        },
        "summary": "Moderate-confidence STS candidate. Two tankers (AZOV and FLAGMAN) maintained close proximity (min 10m, avg 11m) for 36 minutes. Both vessels were slow-moving (avg speeds 0.1 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Sakhalin South Approach, a known STS activity area."
    }
}
Methodology: 2026.01.18
Sts Prigorodnoye/Sakhalin LNG
Oct 27, 2026 08:39 UTC 85/100 ▼
Vessel A: IMO 8135215 (FLAGMAN) Russia
Vessel B: IMO 8930744 (ZAPRAVSHCHIK 05) Russia
  • Minimum Distance: 289 meters
  • Average Distance: 292 meters
  • Duration: 3h 3m
  • Period: 2026-10-27T08:39:56+00:00 to 2026-10-27T11:42:57+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Prigorodnoye/Sakhalin LNG

Confidence Analysis

Score: 85/100

High-confidence STS candidate. Two tankers (FLAGMAN and ZAPRAVSHCHIK 05) maintained close proximity (min 289m, avg 292m) for 183 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Prigorodnoye/Sakhalin LNG, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness15/25Min distance 289m, avg 292m
Duration25/25Duration 183 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±1m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Prigorodnoye/Sakhalin LNG
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273443820,
        "imo": 8135215,
        "name": "FLAGMAN",
        "flag": "Russia"
    },
    "vessel_b": {
        "mmsi": 273439180,
        "imo": 8930744,
        "name": "ZAPRAVSHCHIK 05",
        "flag": "Russia"
    },
    "min_distance_m": 289.19999999999998863131622783839702606201171875,
    "avg_distance_m": 292.1000000000000227373675443232059478759765625,
    "distance_consistency_m": 1.399999999999999911182158029987476766109466552734375,
    "duration_minutes": 183,
    "overlap_duration_s": 10981,
    "speed_a_avg": 0,
    "speed_a_std": 0,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0,
            "max_sog": 0
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-10-27T08:39:56+00:00",
        "end": "2026-10-27T11:42:57+00:00"
    },
    "points_count": {
        "vessel_a": 7,
        "vessel_b": 7
    },
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "score": {
        "value": 85,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 289m, avg 292m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 183 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b11m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Prigorodnoye\/Sakhalin LNG"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (FLAGMAN and ZAPRAVSHCHIK 05) maintained close proximity (min 289m, avg 292m) for 183 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Prigorodnoye\/Sakhalin LNG, a known STS activity area."
    }
}
Methodology: 2026.01.18
Sts Sakhalin South Approach
Oct 27, 2026 08:39 UTC 85/100 ▼
Vessel A: IMO 8135215 (FLAGMAN) Russia
Vessel B: IMO 8930744 (ZAPRAVSHCHIK 05) Russia
  • Minimum Distance: 289 meters
  • Average Distance: 292 meters
  • Duration: 3h 3m
  • Period: 2026-10-27T08:39:56+00:00 to 2026-10-27T11:42:57+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Sakhalin South Approach

Confidence Analysis

Score: 85/100

High-confidence STS candidate. Two tankers (FLAGMAN and ZAPRAVSHCHIK 05) maintained close proximity (min 289m, avg 292m) for 183 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Sakhalin South Approach, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness15/25Min distance 289m, avg 292m
Duration25/25Duration 183 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±1m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Sakhalin South Approach
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273443820,
        "imo": 8135215,
        "name": "FLAGMAN",
        "flag": "Russia"
    },
    "vessel_b": {
        "mmsi": 273439180,
        "imo": 8930744,
        "name": "ZAPRAVSHCHIK 05",
        "flag": "Russia"
    },
    "min_distance_m": 289.19999999999998863131622783839702606201171875,
    "avg_distance_m": 292.1000000000000227373675443232059478759765625,
    "distance_consistency_m": 1.399999999999999911182158029987476766109466552734375,
    "duration_minutes": 183,
    "overlap_duration_s": 10981,
    "speed_a_avg": 0,
    "speed_a_std": 0,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0,
            "max_sog": 0
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-10-27T08:39:56+00:00",
        "end": "2026-10-27T11:42:57+00:00"
    },
    "points_count": {
        "vessel_a": 7,
        "vessel_b": 7
    },
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "score": {
        "value": 85,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 289m, avg 292m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 183 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b11m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Sakhalin South Approach"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (FLAGMAN and ZAPRAVSHCHIK 05) maintained close proximity (min 289m, avg 292m) for 183 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Sakhalin South Approach, a known STS activity area."
    }
}
Methodology: 2026.01.18
Zone Dwell Prigorodnoye/Sakhalin LNG
Oct 27, 2026 08:39 UTC 80.0% ▼
  • Zone: Prigorodnoye/Sakhalin LNG
  • Duration: 3h 24m
  • Data Points: 8 AIS positions
  • Period: 2026-10-27T08:39:56+00:00 to 2026-10-27T12:03:58+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "dwell_minutes": 204,
    "points_in_zone": 8,
    "first_point": {
        "ts": "2026-10-27T08:39:56+00:00",
        "lat": 46.6240667000000001962689566425979137420654296875,
        "lon": 142.769100000000008776623872108757495880126953125
    },
    "last_point": {
        "ts": "2026-10-27T12:03:58+00:00",
        "lat": 46.6240499999999968849806464277207851409912109375,
        "lon": 142.7691317000000026382622309029102325439453125
    }
}
Methodology: 2026.01.18
Zone Dwell Sakhalin South Approach
Oct 27, 2026 08:39 UTC 80.0% ▼
  • Zone: Sakhalin South Approach
  • Duration: 3h 24m
  • Data Points: 8 AIS positions
  • Period: 2026-10-27T08:39:56+00:00 to 2026-10-27T12:03:58+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "dwell_minutes": 204,
    "points_in_zone": 8,
    "first_point": {
        "ts": "2026-10-27T08:39:56+00:00",
        "lat": 46.6240667000000001962689566425979137420654296875,
        "lon": 142.769100000000008776623872108757495880126953125
    },
    "last_point": {
        "ts": "2026-10-27T12:03:58+00:00",
        "lat": 46.6240499999999968849806464277207851409912109375,
        "lon": 142.7691317000000026382622309029102325439453125
    }
}
Methodology: 2026.01.18
Sts🛰️? Prigorodnoye/Sakhalin LNG
Oct 27, 2026 07:16 UTC 95/100 ▼
Vessel A: IMO 8135215 (FLAGMAN) Russia
Vessel B: IMO 9084401 (AZOV) Russia
  • Minimum Distance: 10 meters
  • Average Distance: 12 meters
  • Duration: 4h 47m
  • Period: 2026-10-27T07:16:50+00:00 to 2026-10-27T12:03:58+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Prigorodnoye/Sakhalin LNG

Confidence Analysis

Score: 95/100

High-confidence STS candidate. Two tankers (FLAGMAN and AZOV) maintained close proximity (min 10m, avg 12m) for 287 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Prigorodnoye/Sakhalin LNG, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness25/25Min distance 10m, avg 12m
Duration25/25Duration 287 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±1m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Prigorodnoye/Sakhalin LNG

🛰️ Satellite Corroboration

? SAR Inconclusive

Satellite imagery available but requires review

Preview available for manual review

Scene: S1C_IW_GRDH_1SDV_20261027T081918_20261027T081955_010068_01418C_959E_COG • Acquired: 2026-10-27T08:19:18.858484Z • Platform: sentinel-1c
SAR satellite preview for event 1581784

Click image to view full size

Searched: 2026-10-27T14:00:13.626752+00:00

Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273443820,
        "imo": 8135215,
        "name": "FLAGMAN",
        "flag": "Russia"
    },
    "vessel_b": {
        "mmsi": 273456730,
        "imo": 9084401,
        "name": "AZOV",
        "flag": "Russia"
    },
    "min_distance_m": 10.0999999999999996447286321199499070644378662109375,
    "avg_distance_m": 11.9000000000000003552713678800500929355621337890625,
    "distance_consistency_m": 1.1999999999999999555910790149937383830547332763671875,
    "duration_minutes": 287.1000000000000227373675443232059478759765625,
    "overlap_duration_s": 17228,
    "speed_a_avg": 0,
    "speed_a_std": 0,
    "speed_b_avg": 0.040000000000000000832667268468867405317723751068115234375,
    "speed_b_std": 0.05000000000000000277555756156289135105907917022705078125,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0,
            "max_sog": 0
        },
        "vessel_b": {
            "avg_sog": 0.040000000000000000832667268468867405317723751068115234375,
            "max_sog": 0.1000000000000000055511151231257827021181583404541015625
        }
    },
    "time_window": {
        "start": "2026-10-27T07:16:50+00:00",
        "end": "2026-10-27T12:03:58+00:00"
    },
    "points_count": {
        "vessel_a": 11,
        "vessel_b": 11
    },
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "score": {
        "value": 95,
        "components": {
            "distance_tightness": {
                "score": 25,
                "max": 25,
                "detail": "Min distance 10m, avg 12m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 287 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b11m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Prigorodnoye\/Sakhalin LNG"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (FLAGMAN and AZOV) maintained close proximity (min 10m, avg 12m) for 287 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Prigorodnoye\/Sakhalin LNG, a known STS activity area."
    },
    "sar": {
        "status": "inconclusive",
        "centroid": {
            "lat": 46.624012399999998024213709868490695953369140625,
            "lon": 142.76911530000000993823050521314144134521484375
        },
        "time_window": {
            "start_ts": "2026-10-27T07:16:50+00:00",
            "end_ts": "2026-10-27T12:03:58+00:00"
        },
        "searched_at": "2026-10-27T14:00:13.626752+00:00",
        "scene_id": "S1C_IW_GRDH_1SDV_20261027T081918_20261027T081955_010068_01418C_959E_COG",
        "scene_datetime": "2026-10-27T08:19:18.858484Z",
        "platform": "sentinel-1c",
        "bbox": {
            "min_lon": 141.228850999999991699951351620256900787353515625,
            "min_lat": 44.51316800000000029058355721645057201385498046875,
            "max_lon": 144.993438999999995075995684601366519927978515625,
            "max_lat": 47.07320399999999693818608648143708705902099609375
        },
        "assets": {
            "preview_url": "https:\/\/fleetleaks.com\/wp-content\/uploads\/fleetleaks-evidence\/sar-imagery\/2026\/10\/event_1581784_thumbnail_20261027140017.png",
            "stored_path": "\/home\/fleetleaks\/public_html\/wp-content\/uploads\/fleetleaks-evidence\/sar-imagery\/2026\/10\/event_1581784_thumbnail_20261027140017.png",
            "source": "copernicus_dataspace"
        },
        "notes": "Preview available for manual review"
    }
}
Methodology: 2026.01.18
Sts🛰️? Sakhalin South Approach
Oct 27, 2026 07:16 UTC 95/100 ▼
Vessel A: IMO 8135215 (FLAGMAN) Russia
Vessel B: IMO 9084401 (AZOV) Russia
  • Minimum Distance: 10 meters
  • Average Distance: 12 meters
  • Duration: 4h 47m
  • Period: 2026-10-27T07:16:50+00:00 to 2026-10-27T12:03:58+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Sakhalin South Approach

Confidence Analysis

Score: 95/100

High-confidence STS candidate. Two tankers (FLAGMAN and AZOV) maintained close proximity (min 10m, avg 12m) for 287 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Sakhalin South Approach, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness25/25Min distance 10m, avg 12m
Duration25/25Duration 287 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±1m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Sakhalin South Approach

🛰️ Satellite Corroboration

? SAR Inconclusive

Satellite imagery available but requires review

Preview available for manual review

Scene: S1C_IW_GRDH_1SDV_20261027T081918_20261027T081955_010068_01418C_959E_COG • Acquired: 2026-10-27T08:19:18.858484Z • Platform: sentinel-1c
SAR satellite preview for event 1581785

Click image to view full size

Searched: 2026-10-27T14:00:18.066845+00:00

Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273443820,
        "imo": 8135215,
        "name": "FLAGMAN",
        "flag": "Russia"
    },
    "vessel_b": {
        "mmsi": 273456730,
        "imo": 9084401,
        "name": "AZOV",
        "flag": "Russia"
    },
    "min_distance_m": 10.0999999999999996447286321199499070644378662109375,
    "avg_distance_m": 11.9000000000000003552713678800500929355621337890625,
    "distance_consistency_m": 1.1999999999999999555910790149937383830547332763671875,
    "duration_minutes": 287.1000000000000227373675443232059478759765625,
    "overlap_duration_s": 17228,
    "speed_a_avg": 0,
    "speed_a_std": 0,
    "speed_b_avg": 0.040000000000000000832667268468867405317723751068115234375,
    "speed_b_std": 0.05000000000000000277555756156289135105907917022705078125,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0,
            "max_sog": 0
        },
        "vessel_b": {
            "avg_sog": 0.040000000000000000832667268468867405317723751068115234375,
            "max_sog": 0.1000000000000000055511151231257827021181583404541015625
        }
    },
    "time_window": {
        "start": "2026-10-27T07:16:50+00:00",
        "end": "2026-10-27T12:03:58+00:00"
    },
    "points_count": {
        "vessel_a": 11,
        "vessel_b": 11
    },
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "score": {
        "value": 95,
        "components": {
            "distance_tightness": {
                "score": 25,
                "max": 25,
                "detail": "Min distance 10m, avg 12m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 287 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b11m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Sakhalin South Approach"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (FLAGMAN and AZOV) maintained close proximity (min 10m, avg 12m) for 287 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Sakhalin South Approach, a known STS activity area."
    },
    "sar": {
        "status": "inconclusive",
        "centroid": {
            "lat": 46.624012399999998024213709868490695953369140625,
            "lon": 142.76911530000000993823050521314144134521484375
        },
        "time_window": {
            "start_ts": "2026-10-27T07:16:50+00:00",
            "end_ts": "2026-10-27T12:03:58+00:00"
        },
        "searched_at": "2026-10-27T14:00:18.066845+00:00",
        "scene_id": "S1C_IW_GRDH_1SDV_20261027T081918_20261027T081955_010068_01418C_959E_COG",
        "scene_datetime": "2026-10-27T08:19:18.858484Z",
        "platform": "sentinel-1c",
        "bbox": {
            "min_lon": 141.228850999999991699951351620256900787353515625,
            "min_lat": 44.51316800000000029058355721645057201385498046875,
            "max_lon": 144.993438999999995075995684601366519927978515625,
            "max_lat": 47.07320399999999693818608648143708705902099609375
        },
        "assets": {
            "preview_url": "https:\/\/fleetleaks.com\/wp-content\/uploads\/fleetleaks-evidence\/sar-imagery\/2026\/10\/event_1581785_thumbnail_20261027140021.png",
            "stored_path": "\/home\/fleetleaks\/public_html\/wp-content\/uploads\/fleetleaks-evidence\/sar-imagery\/2026\/10\/event_1581785_thumbnail_20261027140021.png",
            "source": "copernicus_dataspace"
        },
        "notes": "Preview available for manual review"
    }
}
Methodology: 2026.01.18
Zone Dwell Sakhalin South Approach
Oct 27, 2026 07:10 UTC 80.0% ▼
  • Zone: Sakhalin South Approach
  • Duration: 4h 53m
  • Data Points: 12 AIS positions
  • Period: 2026-10-27T07:10:50+00:00 to 2026-10-27T12:03:58+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "dwell_minutes": 293.1000000000000227373675443232059478759765625,
    "points_in_zone": 12,
    "first_point": {
        "ts": "2026-10-27T07:10:50+00:00",
        "lat": 46.6240667000000001962689566425979137420654296875,
        "lon": 142.769100000000008776623872108757495880126953125
    },
    "last_point": {
        "ts": "2026-10-27T12:03:58+00:00",
        "lat": 46.6240499999999968849806464277207851409912109375,
        "lon": 142.7691317000000026382622309029102325439453125
    }
}
Methodology: 2026.01.18
Zone Dwell Prigorodnoye/Sakhalin LNG
Oct 27, 2026 07:10 UTC 80.0% ▼
  • Zone: Prigorodnoye/Sakhalin LNG
  • Duration: 4h 53m
  • Data Points: 12 AIS positions
  • Period: 2026-10-27T07:10:50+00:00 to 2026-10-27T12:03:58+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "dwell_minutes": 293.1000000000000227373675443232059478759765625,
    "points_in_zone": 12,
    "first_point": {
        "ts": "2026-10-27T07:10:50+00:00",
        "lat": 46.6240667000000001962689566425979137420654296875,
        "lon": 142.769100000000008776623872108757495880126953125
    },
    "last_point": {
        "ts": "2026-10-27T12:03:58+00:00",
        "lat": 46.6240499999999968849806464277207851409912109375,
        "lon": 142.7691317000000026382622309029102325439453125
    }
}
Methodology: 2026.01.18
Loiter Prigorodnoye/Sakhalin LNG
Oct 27, 2026 07:10 UTC 75.0% ▼
  • Duration: 4h 53m
  • Radius: 3 meters
  • Data Points: 12 AIS positions
  • Centroid: 46.6241, 142.7691
  • Zone: Prigorodnoye/Sakhalin LNG
Show Raw Evidence JSON
{
    "radius_m": 2.70000000000000017763568394002504646778106689453125,
    "duration_minutes": 293.1000000000000227373675443232059478759765625,
    "points": 12,
    "centroid": {
        "lat": 46.62406529166667468189189094118773937225341796875,
        "lon": 142.7691066749999890816980041563510894775390625
    },
    "bbox": {
        "min_lat": 46.6240499999999968849806464277207851409912109375,
        "min_lon": 142.769083300000005465335561893880367279052734375,
        "max_lat": 46.62408330000000233894752454943954944610595703125,
        "max_lon": 142.7691317000000026382622309029102325439453125
    },
    "zone_id": "russia_prigorodnoye"
}
Methodology: 2026.01.18
Loiter Sakhalin South Approach
Oct 27, 2026 07:10 UTC 75.0% ▼
  • Duration: 4h 53m
  • Radius: 3 meters
  • Data Points: 12 AIS positions
  • Centroid: 46.6241, 142.7691
  • Zone: Sakhalin South Approach
Show Raw Evidence JSON
{
    "radius_m": 2.70000000000000017763568394002504646778106689453125,
    "duration_minutes": 293.1000000000000227373675443232059478759765625,
    "points": 12,
    "centroid": {
        "lat": 46.62406529166667468189189094118773937225341796875,
        "lon": 142.7691066749999890816980041563510894775390625
    },
    "bbox": {
        "min_lat": 46.6240499999999968849806464277207851409912109375,
        "min_lon": 142.769083300000005465335561893880367279052734375,
        "max_lat": 46.62408330000000233894752454943954944610595703125,
        "max_lon": 142.7691317000000026382622309029102325439453125
    },
    "zone_id": "russia_sakhalin_south"
}
Methodology: 2026.01.18
Sts Prigorodnoye/Sakhalin LNG
Oct 27, 2026 07:10 UTC 80/100 ▼
Vessel A: IMO 8930744 (ZAPRAVSHCHIK 05) Russia
Vessel B: IMO 8135215 (FLAGMAN) Russia
  • Minimum Distance: 291 meters
  • Average Distance: 292 meters
  • Duration: 1h 50m
  • Period: 2026-10-27T07:10:49+00:00 to 2026-10-27T09:01:45+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Prigorodnoye/Sakhalin LNG

Confidence Analysis

Score: 80/100

High-confidence STS candidate. Two tankers (ZAPRAVSHCHIK 05 and FLAGMAN) maintained close proximity (min 291m, avg 292m) for 111 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Prigorodnoye/Sakhalin LNG, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness15/25Min distance 291m, avg 292m
Duration20/25Duration 111 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±0m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Prigorodnoye/Sakhalin LNG
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273439180,
        "imo": 8930744,
        "name": "ZAPRAVSHCHIK 05",
        "flag": "Russia"
    },
    "vessel_b": {
        "mmsi": 273443820,
        "imo": 8135215,
        "name": "FLAGMAN",
        "flag": "Russia"
    },
    "min_distance_m": 291.3999999999999772626324556767940521240234375,
    "avg_distance_m": 291.80000000000001136868377216160297393798828125,
    "distance_consistency_m": 0.40000000000000002220446049250313080847263336181640625,
    "duration_minutes": 110.900000000000005684341886080801486968994140625,
    "overlap_duration_s": 6656,
    "speed_a_avg": 0,
    "speed_a_std": 0,
    "speed_b_avg": 0.0200000000000000004163336342344337026588618755340576171875,
    "speed_b_std": 0.040000000000000000832667268468867405317723751068115234375,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0,
            "max_sog": 0
        },
        "vessel_b": {
            "avg_sog": 0.0200000000000000004163336342344337026588618755340576171875,
            "max_sog": 0.1000000000000000055511151231257827021181583404541015625
        }
    },
    "time_window": {
        "start": "2026-10-27T07:10:49+00:00",
        "end": "2026-10-27T09:01:45+00:00"
    },
    "points_count": {
        "vessel_a": 5,
        "vessel_b": 5
    },
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "score": {
        "value": 80,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 291m, avg 292m"
            },
            "duration": {
                "score": 20,
                "max": 25,
                "detail": "Duration 111 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b10m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Prigorodnoye\/Sakhalin LNG"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (ZAPRAVSHCHIK 05 and FLAGMAN) maintained close proximity (min 291m, avg 292m) for 111 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Prigorodnoye\/Sakhalin LNG, a known STS activity area."
    }
}
Methodology: 2026.01.18
Sts Sakhalin South Approach
Oct 27, 2026 07:10 UTC 80/100 ▼
Vessel A: IMO 8930744 (ZAPRAVSHCHIK 05) Russia
Vessel B: IMO 8135215 (FLAGMAN) Russia
  • Minimum Distance: 291 meters
  • Average Distance: 292 meters
  • Duration: 1h 50m
  • Period: 2026-10-27T07:10:49+00:00 to 2026-10-27T09:01:45+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Sakhalin South Approach

Confidence Analysis

Score: 80/100

High-confidence STS candidate. Two tankers (ZAPRAVSHCHIK 05 and FLAGMAN) maintained close proximity (min 291m, avg 292m) for 111 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Sakhalin South Approach, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness15/25Min distance 291m, avg 292m
Duration20/25Duration 111 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±0m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Sakhalin South Approach
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273439180,
        "imo": 8930744,
        "name": "ZAPRAVSHCHIK 05",
        "flag": "Russia"
    },
    "vessel_b": {
        "mmsi": 273443820,
        "imo": 8135215,
        "name": "FLAGMAN",
        "flag": "Russia"
    },
    "min_distance_m": 291.3999999999999772626324556767940521240234375,
    "avg_distance_m": 291.80000000000001136868377216160297393798828125,
    "distance_consistency_m": 0.40000000000000002220446049250313080847263336181640625,
    "duration_minutes": 110.900000000000005684341886080801486968994140625,
    "overlap_duration_s": 6656,
    "speed_a_avg": 0,
    "speed_a_std": 0,
    "speed_b_avg": 0.0200000000000000004163336342344337026588618755340576171875,
    "speed_b_std": 0.040000000000000000832667268468867405317723751068115234375,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0,
            "max_sog": 0
        },
        "vessel_b": {
            "avg_sog": 0.0200000000000000004163336342344337026588618755340576171875,
            "max_sog": 0.1000000000000000055511151231257827021181583404541015625
        }
    },
    "time_window": {
        "start": "2026-10-27T07:10:49+00:00",
        "end": "2026-10-27T09:01:45+00:00"
    },
    "points_count": {
        "vessel_a": 5,
        "vessel_b": 5
    },
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "score": {
        "value": 80,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 291m, avg 292m"
            },
            "duration": {
                "score": 20,
                "max": 25,
                "detail": "Duration 111 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b10m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Sakhalin South Approach"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (ZAPRAVSHCHIK 05 and FLAGMAN) maintained close proximity (min 291m, avg 292m) for 111 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Sakhalin South Approach, a known STS activity area."
    }
}
Methodology: 2026.01.18
Sts🛰️? Prigorodnoye/Sakhalin LNG
Oct 27, 2026 06:13 UTC 95/100 ▼
Vessel A: IMO 8135215 (FLAGMAN) Russia
Vessel B: IMO 9084401 (AZOV) Russia
  • Minimum Distance: 10 meters
  • Average Distance: 12 meters
  • Duration: 5h 50m
  • Period: 2026-10-27T06:13:49+00:00 to 2026-10-27T12:03:58+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Prigorodnoye/Sakhalin LNG

Confidence Analysis

Score: 95/100

High-confidence STS candidate. Two tankers (FLAGMAN and AZOV) maintained close proximity (min 10m, avg 12m) for 350 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Prigorodnoye/Sakhalin LNG, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness25/25Min distance 10m, avg 12m
Duration25/25Duration 350 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±1m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Prigorodnoye/Sakhalin LNG

🛰️ Satellite Corroboration

? SAR Inconclusive

Satellite imagery available but requires review

Preview available for manual review

Scene: S1C_IW_GRDH_1SDV_20261027T081918_20261027T081955_010068_01418C_959E_COG • Acquired: 2026-10-27T08:19:18.858484Z • Platform: sentinel-1c
SAR satellite preview for event 1581508

Click image to view full size

Searched: 2026-10-27T12:45:04.127914+00:00

Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273443820,
        "imo": 8135215,
        "name": "FLAGMAN",
        "flag": "Russia"
    },
    "vessel_b": {
        "mmsi": 273456730,
        "imo": 9084401,
        "name": "AZOV",
        "flag": "Russia"
    },
    "min_distance_m": 10.0999999999999996447286321199499070644378662109375,
    "avg_distance_m": 11.9000000000000003552713678800500929355621337890625,
    "distance_consistency_m": 1.100000000000000088817841970012523233890533447265625,
    "duration_minutes": 350.1000000000000227373675443232059478759765625,
    "overlap_duration_s": 21009,
    "speed_a_avg": 0.01000000000000000020816681711721685132943093776702880859375,
    "speed_a_std": 0.0299999999999999988897769753748434595763683319091796875,
    "speed_b_avg": 0.040000000000000000832667268468867405317723751068115234375,
    "speed_b_std": 0.05000000000000000277555756156289135105907917022705078125,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.01000000000000000020816681711721685132943093776702880859375,
            "max_sog": 0.1000000000000000055511151231257827021181583404541015625
        },
        "vessel_b": {
            "avg_sog": 0.040000000000000000832667268468867405317723751068115234375,
            "max_sog": 0.1000000000000000055511151231257827021181583404541015625
        }
    },
    "time_window": {
        "start": "2026-10-27T06:13:49+00:00",
        "end": "2026-10-27T12:03:58+00:00"
    },
    "points_count": {
        "vessel_a": 14,
        "vessel_b": 14
    },
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "score": {
        "value": 95,
        "components": {
            "distance_tightness": {
                "score": 25,
                "max": 25,
                "detail": "Min distance 10m, avg 12m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 350 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b11m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Prigorodnoye\/Sakhalin LNG"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (FLAGMAN and AZOV) maintained close proximity (min 10m, avg 12m) for 350 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Prigorodnoye\/Sakhalin LNG, a known STS activity area."
    },
    "sar": {
        "status": "inconclusive",
        "centroid": {
            "lat": 46.62401280000000269865267910063266754150390625,
            "lon": 142.769116599999989603020367212593555450439453125
        },
        "time_window": {
            "start_ts": "2026-10-27T06:13:49+00:00",
            "end_ts": "2026-10-27T12:03:58+00:00"
        },
        "searched_at": "2026-10-27T12:45:04.127914+00:00",
        "scene_id": "S1C_IW_GRDH_1SDV_20261027T081918_20261027T081955_010068_01418C_959E_COG",
        "scene_datetime": "2026-10-27T08:19:18.858484Z",
        "platform": "sentinel-1c",
        "bbox": {
            "min_lon": 141.228850999999991699951351620256900787353515625,
            "min_lat": 44.51316800000000029058355721645057201385498046875,
            "max_lon": 144.993438999999995075995684601366519927978515625,
            "max_lat": 47.07320399999999693818608648143708705902099609375
        },
        "assets": {
            "preview_url": "https:\/\/fleetleaks.com\/wp-content\/uploads\/fleetleaks-evidence\/sar-imagery\/2026\/10\/event_1581508_thumbnail_20261027124509.png",
            "stored_path": "\/home\/fleetleaks\/public_html\/wp-content\/uploads\/fleetleaks-evidence\/sar-imagery\/2026\/10\/event_1581508_thumbnail_20261027124509.png",
            "source": "copernicus_dataspace"
        },
        "notes": "Preview available for manual review"
    }
}
Methodology: 2026.01.18
Sts🛰️? Sakhalin South Approach
Oct 27, 2026 06:13 UTC 95/100 ▼
Vessel A: IMO 8135215 (FLAGMAN) Russia
Vessel B: IMO 9084401 (AZOV) Russia
  • Minimum Distance: 10 meters
  • Average Distance: 12 meters
  • Duration: 5h 50m
  • Period: 2026-10-27T06:13:49+00:00 to 2026-10-27T12:03:58+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Sakhalin South Approach

Confidence Analysis

Score: 95/100

High-confidence STS candidate. Two tankers (FLAGMAN and AZOV) maintained close proximity (min 10m, avg 12m) for 350 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Sakhalin South Approach, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness25/25Min distance 10m, avg 12m
Duration25/25Duration 350 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±1m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Sakhalin South Approach

🛰️ Satellite Corroboration

? SAR Inconclusive

Satellite imagery available but requires review

Preview available for manual review

Scene: S1C_IW_GRDH_1SDV_20261027T081918_20261027T081955_010068_01418C_959E_COG • Acquired: 2026-10-27T08:19:18.858484Z • Platform: sentinel-1c
SAR satellite preview for event 1581509

Click image to view full size

Searched: 2026-10-27T12:45:10.181710+00:00

Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273443820,
        "imo": 8135215,
        "name": "FLAGMAN",
        "flag": "Russia"
    },
    "vessel_b": {
        "mmsi": 273456730,
        "imo": 9084401,
        "name": "AZOV",
        "flag": "Russia"
    },
    "min_distance_m": 10.0999999999999996447286321199499070644378662109375,
    "avg_distance_m": 11.9000000000000003552713678800500929355621337890625,
    "distance_consistency_m": 1.100000000000000088817841970012523233890533447265625,
    "duration_minutes": 350.1000000000000227373675443232059478759765625,
    "overlap_duration_s": 21009,
    "speed_a_avg": 0.01000000000000000020816681711721685132943093776702880859375,
    "speed_a_std": 0.0299999999999999988897769753748434595763683319091796875,
    "speed_b_avg": 0.040000000000000000832667268468867405317723751068115234375,
    "speed_b_std": 0.05000000000000000277555756156289135105907917022705078125,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.01000000000000000020816681711721685132943093776702880859375,
            "max_sog": 0.1000000000000000055511151231257827021181583404541015625
        },
        "vessel_b": {
            "avg_sog": 0.040000000000000000832667268468867405317723751068115234375,
            "max_sog": 0.1000000000000000055511151231257827021181583404541015625
        }
    },
    "time_window": {
        "start": "2026-10-27T06:13:49+00:00",
        "end": "2026-10-27T12:03:58+00:00"
    },
    "points_count": {
        "vessel_a": 14,
        "vessel_b": 14
    },
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "score": {
        "value": 95,
        "components": {
            "distance_tightness": {
                "score": 25,
                "max": 25,
                "detail": "Min distance 10m, avg 12m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 350 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b11m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Sakhalin South Approach"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (FLAGMAN and AZOV) maintained close proximity (min 10m, avg 12m) for 350 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Sakhalin South Approach, a known STS activity area."
    },
    "sar": {
        "status": "inconclusive",
        "centroid": {
            "lat": 46.62401280000000269865267910063266754150390625,
            "lon": 142.769116599999989603020367212593555450439453125
        },
        "time_window": {
            "start_ts": "2026-10-27T06:13:49+00:00",
            "end_ts": "2026-10-27T12:03:58+00:00"
        },
        "searched_at": "2026-10-27T12:45:10.181710+00:00",
        "scene_id": "S1C_IW_GRDH_1SDV_20261027T081918_20261027T081955_010068_01418C_959E_COG",
        "scene_datetime": "2026-10-27T08:19:18.858484Z",
        "platform": "sentinel-1c",
        "bbox": {
            "min_lon": 141.228850999999991699951351620256900787353515625,
            "min_lat": 44.51316800000000029058355721645057201385498046875,
            "max_lon": 144.993438999999995075995684601366519927978515625,
            "max_lat": 47.07320399999999693818608648143708705902099609375
        },
        "assets": {
            "preview_url": "https:\/\/fleetleaks.com\/wp-content\/uploads\/fleetleaks-evidence\/sar-imagery\/2026\/10\/event_1581509_thumbnail_20261027124513.png",
            "stored_path": "\/home\/fleetleaks\/public_html\/wp-content\/uploads\/fleetleaks-evidence\/sar-imagery\/2026\/10\/event_1581509_thumbnail_20261027124513.png",
            "source": "copernicus_dataspace"
        },
        "notes": "Preview available for manual review"
    }
}
Methodology: 2026.01.18
Zone Dwell Prigorodnoye/Sakhalin LNG
Oct 27, 2026 06:01 UTC 80.0% ▼
  • Zone: Prigorodnoye/Sakhalin LNG
  • Duration: 6h 2m
  • Data Points: 16 AIS positions
  • Period: 2026-10-27T06:01:49+00:00 to 2026-10-27T12:03:58+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "dwell_minutes": 362.1000000000000227373675443232059478759765625,
    "points_in_zone": 16,
    "first_point": {
        "ts": "2026-10-27T06:01:49+00:00",
        "lat": 46.6240667000000001962689566425979137420654296875,
        "lon": 142.769116700000012087912182323634624481201171875
    },
    "last_point": {
        "ts": "2026-10-27T12:03:58+00:00",
        "lat": 46.6240499999999968849806464277207851409912109375,
        "lon": 142.7691317000000026382622309029102325439453125
    }
}
Methodology: 2026.01.18
Zone Dwell Sakhalin South Approach
Oct 27, 2026 06:01 UTC 80.0% ▼
  • Zone: Sakhalin South Approach
  • Duration: 6h 2m
  • Data Points: 16 AIS positions
  • Period: 2026-10-27T06:01:49+00:00 to 2026-10-27T12:03:58+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "dwell_minutes": 362.1000000000000227373675443232059478759765625,
    "points_in_zone": 16,
    "first_point": {
        "ts": "2026-10-27T06:01:49+00:00",
        "lat": 46.6240667000000001962689566425979137420654296875,
        "lon": 142.769116700000012087912182323634624481201171875
    },
    "last_point": {
        "ts": "2026-10-27T12:03:58+00:00",
        "lat": 46.6240499999999968849806464277207851409912109375,
        "lon": 142.7691317000000026382622309029102325439453125
    }
}
Methodology: 2026.01.18
Loiter Prigorodnoye/Sakhalin LNG
Oct 27, 2026 06:01 UTC 75.0% ▼
  • Duration: 6h 2m
  • Radius: 3 meters
  • Data Points: 16 AIS positions
  • Centroid: 46.6241, 142.7691
  • Zone: Prigorodnoye/Sakhalin LNG
Show Raw Evidence JSON
{
    "radius_m": 2.79999999999999982236431605997495353221893310546875,
    "duration_minutes": 362.1000000000000227373675443232059478759765625,
    "points": 16,
    "centroid": {
        "lat": 46.6240656437500007314156391657888889312744140625,
        "lon": 142.769109074999988706622389145195484161376953125
    },
    "bbox": {
        "min_lat": 46.6240499999999968849806464277207851409912109375,
        "min_lon": 142.769083300000005465335561893880367279052734375,
        "max_lat": 46.62408330000000233894752454943954944610595703125,
        "max_lon": 142.7691317000000026382622309029102325439453125
    },
    "zone_id": "russia_prigorodnoye"
}
Methodology: 2026.01.18
Loiter Sakhalin South Approach
Oct 27, 2026 06:01 UTC 75.0% ▼
  • Duration: 6h 2m
  • Radius: 3 meters
  • Data Points: 16 AIS positions
  • Centroid: 46.6241, 142.7691
  • Zone: Sakhalin South Approach
Show Raw Evidence JSON
{
    "radius_m": 2.79999999999999982236431605997495353221893310546875,
    "duration_minutes": 362.1000000000000227373675443232059478759765625,
    "points": 16,
    "centroid": {
        "lat": 46.6240656437500007314156391657888889312744140625,
        "lon": 142.769109074999988706622389145195484161376953125
    },
    "bbox": {
        "min_lat": 46.6240499999999968849806464277207851409912109375,
        "min_lon": 142.769083300000005465335561893880367279052734375,
        "max_lat": 46.62408330000000233894752454943954944610595703125,
        "max_lon": 142.7691317000000026382622309029102325439453125
    },
    "zone_id": "russia_sakhalin_south"
}
Methodology: 2026.01.18
Sts Prigorodnoye/Sakhalin LNG
Oct 27, 2026 05:45 UTC 95/100 ▼
Vessel A: IMO 8135215 (FLAGMAN) Russia
Vessel B: IMO 9084401 (AZOV) Russia
  • Minimum Distance: 10 meters
  • Average Distance: 12 meters
  • Duration: 5h 47m
  • Period: 2026-10-27T05:55:49+00:00 to 2026-10-27T11:42:57+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Prigorodnoye/Sakhalin LNG

Confidence Analysis

Score: 95/100

High-confidence STS candidate. Two tankers (FLAGMAN and AZOV) maintained close proximity (min 10m, avg 12m) for 347 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Prigorodnoye/Sakhalin LNG, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness25/25Min distance 10m, avg 12m
Duration25/25Duration 347 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±1m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Prigorodnoye/Sakhalin LNG
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273443820,
        "imo": 8135215,
        "name": "FLAGMAN",
        "flag": "Russia"
    },
    "vessel_b": {
        "mmsi": 273456730,
        "imo": 9084401,
        "name": "AZOV",
        "flag": "Russia"
    },
    "min_distance_m": 10.0999999999999996447286321199499070644378662109375,
    "avg_distance_m": 11.800000000000000710542735760100185871124267578125,
    "distance_consistency_m": 1.100000000000000088817841970012523233890533447265625,
    "duration_minutes": 347.1000000000000227373675443232059478759765625,
    "overlap_duration_s": 20828,
    "speed_a_avg": 0.0200000000000000004163336342344337026588618755340576171875,
    "speed_a_std": 0.040000000000000000832667268468867405317723751068115234375,
    "speed_b_avg": 0.040000000000000000832667268468867405317723751068115234375,
    "speed_b_std": 0.05000000000000000277555756156289135105907917022705078125,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.0200000000000000004163336342344337026588618755340576171875,
            "max_sog": 0.1000000000000000055511151231257827021181583404541015625
        },
        "vessel_b": {
            "avg_sog": 0.040000000000000000832667268468867405317723751068115234375,
            "max_sog": 0.1000000000000000055511151231257827021181583404541015625
        }
    },
    "time_window": {
        "start": "2026-10-27T05:55:49+00:00",
        "end": "2026-10-27T11:42:57+00:00"
    },
    "points_count": {
        "vessel_a": 16,
        "vessel_b": 16
    },
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "score": {
        "value": 95,
        "components": {
            "distance_tightness": {
                "score": 25,
                "max": 25,
                "detail": "Min distance 10m, avg 12m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 347 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b11m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Prigorodnoye\/Sakhalin LNG"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (FLAGMAN and AZOV) maintained close proximity (min 10m, avg 12m) for 347 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Prigorodnoye\/Sakhalin LNG, a known STS activity area."
    }
}
Methodology: 2026.01.18
Sts Sakhalin South Approach
Oct 27, 2026 05:45 UTC 95/100 ▼
Vessel A: IMO 8135215 (FLAGMAN) Russia
Vessel B: IMO 9084401 (AZOV) Russia
  • Minimum Distance: 10 meters
  • Average Distance: 12 meters
  • Duration: 5h 47m
  • Period: 2026-10-27T05:55:49+00:00 to 2026-10-27T11:42:57+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Sakhalin South Approach

Confidence Analysis

Score: 95/100

High-confidence STS candidate. Two tankers (FLAGMAN and AZOV) maintained close proximity (min 10m, avg 12m) for 347 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Sakhalin South Approach, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness25/25Min distance 10m, avg 12m
Duration25/25Duration 347 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±1m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Sakhalin South Approach
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273443820,
        "imo": 8135215,
        "name": "FLAGMAN",
        "flag": "Russia"
    },
    "vessel_b": {
        "mmsi": 273456730,
        "imo": 9084401,
        "name": "AZOV",
        "flag": "Russia"
    },
    "min_distance_m": 10.0999999999999996447286321199499070644378662109375,
    "avg_distance_m": 11.800000000000000710542735760100185871124267578125,
    "distance_consistency_m": 1.100000000000000088817841970012523233890533447265625,
    "duration_minutes": 347.1000000000000227373675443232059478759765625,
    "overlap_duration_s": 20828,
    "speed_a_avg": 0.0200000000000000004163336342344337026588618755340576171875,
    "speed_a_std": 0.040000000000000000832667268468867405317723751068115234375,
    "speed_b_avg": 0.040000000000000000832667268468867405317723751068115234375,
    "speed_b_std": 0.05000000000000000277555756156289135105907917022705078125,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.0200000000000000004163336342344337026588618755340576171875,
            "max_sog": 0.1000000000000000055511151231257827021181583404541015625
        },
        "vessel_b": {
            "avg_sog": 0.040000000000000000832667268468867405317723751068115234375,
            "max_sog": 0.1000000000000000055511151231257827021181583404541015625
        }
    },
    "time_window": {
        "start": "2026-10-27T05:55:49+00:00",
        "end": "2026-10-27T11:42:57+00:00"
    },
    "points_count": {
        "vessel_a": 16,
        "vessel_b": 16
    },
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "score": {
        "value": 95,
        "components": {
            "distance_tightness": {
                "score": 25,
                "max": 25,
                "detail": "Min distance 10m, avg 12m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 347 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b11m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Sakhalin South Approach"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (FLAGMAN and AZOV) maintained close proximity (min 10m, avg 12m) for 347 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Sakhalin South Approach, a known STS activity area."
    }
}
Methodology: 2026.01.18
Zone Dwell Prigorodnoye/Sakhalin LNG
Oct 27, 2026 05:25 UTC 80.0% ▼
  • Zone: Prigorodnoye/Sakhalin LNG
  • Duration: 6h 8m
  • Data Points: 17 AIS positions
  • Period: 2026-10-27T05:55:49+00:00 to 2026-10-27T12:03:58+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "dwell_minutes": 368.1000000000000227373675443232059478759765625,
    "points_in_zone": 17,
    "first_point": {
        "ts": "2026-10-27T05:55:49+00:00",
        "lat": 46.6240667000000001962689566425979137420654296875,
        "lon": 142.7691317000000026382622309029102325439453125
    },
    "last_point": {
        "ts": "2026-10-27T12:03:58+00:00",
        "lat": 46.6240499999999968849806464277207851409912109375,
        "lon": 142.7691317000000026382622309029102325439453125
    }
}
Methodology: 2026.01.18
Zone Dwell Sakhalin South Approach
Oct 27, 2026 05:25 UTC 80.0% ▼
  • Zone: Sakhalin South Approach
  • Duration: 6h 8m
  • Data Points: 17 AIS positions
  • Period: 2026-10-27T05:55:49+00:00 to 2026-10-27T12:03:58+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "dwell_minutes": 368.1000000000000227373675443232059478759765625,
    "points_in_zone": 17,
    "first_point": {
        "ts": "2026-10-27T05:55:49+00:00",
        "lat": 46.6240667000000001962689566425979137420654296875,
        "lon": 142.7691317000000026382622309029102325439453125
    },
    "last_point": {
        "ts": "2026-10-27T12:03:58+00:00",
        "lat": 46.6240499999999968849806464277207851409912109375,
        "lon": 142.7691317000000026382622309029102325439453125
    }
}
Methodology: 2026.01.18
Loiter Prigorodnoye/Sakhalin LNG
Oct 27, 2026 05:25 UTC 75.0% ▼
  • Duration: 6h 8m
  • Radius: 3 meters
  • Data Points: 17 AIS positions
  • Centroid: 46.6241, 142.7691
  • Zone: Prigorodnoye/Sakhalin LNG
Show Raw Evidence JSON
{
    "radius_m": 2.899999999999999911182158029987476766109466552734375,
    "duration_minutes": 368.1000000000000227373675443232059478759765625,
    "points": 17,
    "centroid": {
        "lat": 46.62406570588235155128131737001240253448486328125,
        "lon": 142.769110405882344139172346331179141998291015625
    },
    "bbox": {
        "min_lat": 46.6240499999999968849806464277207851409912109375,
        "min_lon": 142.769083300000005465335561893880367279052734375,
        "max_lat": 46.62408330000000233894752454943954944610595703125,
        "max_lon": 142.7691317000000026382622309029102325439453125
    },
    "zone_id": "russia_prigorodnoye"
}
Methodology: 2026.01.18
Loiter Sakhalin South Approach
Oct 27, 2026 05:25 UTC 75.0% ▼
  • Duration: 6h 8m
  • Radius: 3 meters
  • Data Points: 17 AIS positions
  • Centroid: 46.6241, 142.7691
  • Zone: Sakhalin South Approach
Show Raw Evidence JSON
{
    "radius_m": 2.899999999999999911182158029987476766109466552734375,
    "duration_minutes": 368.1000000000000227373675443232059478759765625,
    "points": 17,
    "centroid": {
        "lat": 46.62406570588235155128131737001240253448486328125,
        "lon": 142.769110405882344139172346331179141998291015625
    },
    "bbox": {
        "min_lat": 46.6240499999999968849806464277207851409912109375,
        "min_lon": 142.769083300000005465335561893880367279052734375,
        "max_lat": 46.62408330000000233894752454943954944610595703125,
        "max_lon": 142.7691317000000026382622309029102325439453125
    },
    "zone_id": "russia_sakhalin_south"
}
Methodology: 2026.01.18
Sts🛰️? Prigorodnoye/Sakhalin LNG
Oct 27, 2026 04:04 UTC 95/100 ▼
Vessel A: IMO 8135215 (FLAGMAN) Russia
Vessel B: IMO 9084401 (AZOV) Russia
  • Minimum Distance: 10 meters
  • Average Distance: 12 meters
  • Duration: 4h 47m
  • Period: 2026-10-27T04:04:49+00:00 to 2026-10-27T08:51:56+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Prigorodnoye/Sakhalin LNG

Confidence Analysis

Score: 95/100

High-confidence STS candidate. Two tankers (FLAGMAN and AZOV) maintained close proximity (min 10m, avg 12m) for 287 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Prigorodnoye/Sakhalin LNG, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness25/25Min distance 10m, avg 12m
Duration25/25Duration 287 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±1m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Prigorodnoye/Sakhalin LNG

🛰️ Satellite Corroboration

? SAR Inconclusive

Satellite imagery available but requires review

Preview available for manual review

Scene: S1C_IW_GRDH_1SDV_20261027T081918_20261027T081955_010068_01418C_959E_COG • Acquired: 2026-10-27T08:19:18.858484Z • Platform: sentinel-1c
SAR satellite preview for event 1580668

Click image to view full size

Searched: 2026-10-27T09:45:01.359347+00:00

Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273443820,
        "imo": 8135215,
        "name": "FLAGMAN",
        "flag": "Russia"
    },
    "vessel_b": {
        "mmsi": 273456730,
        "imo": 9084401,
        "name": "AZOV",
        "flag": "Russia"
    },
    "min_distance_m": 10.0999999999999996447286321199499070644378662109375,
    "avg_distance_m": 12,
    "distance_consistency_m": 1.1999999999999999555910790149937383830547332763671875,
    "duration_minutes": 287.1000000000000227373675443232059478759765625,
    "overlap_duration_s": 17227,
    "speed_a_avg": 0.0299999999999999988897769753748434595763683319091796875,
    "speed_a_std": 0.05000000000000000277555756156289135105907917022705078125,
    "speed_b_avg": 0.0200000000000000004163336342344337026588618755340576171875,
    "speed_b_std": 0.040000000000000000832667268468867405317723751068115234375,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.0299999999999999988897769753748434595763683319091796875,
            "max_sog": 0.1000000000000000055511151231257827021181583404541015625
        },
        "vessel_b": {
            "avg_sog": 0.0200000000000000004163336342344337026588618755340576171875,
            "max_sog": 0.1000000000000000055511151231257827021181583404541015625
        }
    },
    "time_window": {
        "start": "2026-10-27T04:04:49+00:00",
        "end": "2026-10-27T08:51:56+00:00"
    },
    "points_count": {
        "vessel_a": 14,
        "vessel_b": 14
    },
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "score": {
        "value": 95,
        "components": {
            "distance_tightness": {
                "score": 25,
                "max": 25,
                "detail": "Min distance 10m, avg 12m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 287 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b11m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Prigorodnoye\/Sakhalin LNG"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (FLAGMAN and AZOV) maintained close proximity (min 10m, avg 12m) for 287 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Prigorodnoye\/Sakhalin LNG, a known STS activity area."
    },
    "sar": {
        "status": "inconclusive",
        "centroid": {
            "lat": 46.62401539999999755536919110454618930816650390625,
            "lon": 142.769123699999994414611137472093105316162109375
        },
        "time_window": {
            "start_ts": "2026-10-27T04:04:49+00:00",
            "end_ts": "2026-10-27T08:51:56+00:00"
        },
        "searched_at": "2026-10-27T09:45:01.359347+00:00",
        "scene_id": "S1C_IW_GRDH_1SDV_20261027T081918_20261027T081955_010068_01418C_959E_COG",
        "scene_datetime": "2026-10-27T08:19:18.858484Z",
        "platform": "sentinel-1c",
        "bbox": {
            "min_lon": 141.228850999999991699951351620256900787353515625,
            "min_lat": 44.51316800000000029058355721645057201385498046875,
            "max_lon": 144.993438999999995075995684601366519927978515625,
            "max_lat": 47.07320399999999693818608648143708705902099609375
        },
        "assets": {
            "preview_url": "https:\/\/fleetleaks.com\/wp-content\/uploads\/fleetleaks-evidence\/sar-imagery\/2026\/10\/event_1580668_thumbnail_20261027094506.png",
            "stored_path": "\/home\/fleetleaks\/public_html\/wp-content\/uploads\/fleetleaks-evidence\/sar-imagery\/2026\/10\/event_1580668_thumbnail_20261027094506.png",
            "source": "copernicus_dataspace"
        },
        "notes": "Preview available for manual review"
    }
}
Methodology: 2026.01.18
Sts🛰️? Sakhalin South Approach
Oct 27, 2026 04:04 UTC 95/100 ▼
Vessel A: IMO 8135215 (FLAGMAN) Russia
Vessel B: IMO 9084401 (AZOV) Russia
  • Minimum Distance: 10 meters
  • Average Distance: 12 meters
  • Duration: 4h 47m
  • Period: 2026-10-27T04:04:49+00:00 to 2026-10-27T08:51:56+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Sakhalin South Approach

Confidence Analysis

Score: 95/100

High-confidence STS candidate. Two tankers (FLAGMAN and AZOV) maintained close proximity (min 10m, avg 12m) for 287 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Sakhalin South Approach, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness25/25Min distance 10m, avg 12m
Duration25/25Duration 287 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±1m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Sakhalin South Approach

🛰️ Satellite Corroboration

? SAR Inconclusive

Satellite imagery available but requires review

Preview available for manual review

Scene: S1C_IW_GRDH_1SDV_20261027T081918_20261027T081955_010068_01418C_959E_COG • Acquired: 2026-10-27T08:19:18.858484Z • Platform: sentinel-1c
SAR satellite preview for event 1580669

Click image to view full size

Searched: 2026-10-27T09:45:07.279576+00:00

Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273443820,
        "imo": 8135215,
        "name": "FLAGMAN",
        "flag": "Russia"
    },
    "vessel_b": {
        "mmsi": 273456730,
        "imo": 9084401,
        "name": "AZOV",
        "flag": "Russia"
    },
    "min_distance_m": 10.0999999999999996447286321199499070644378662109375,
    "avg_distance_m": 12,
    "distance_consistency_m": 1.1999999999999999555910790149937383830547332763671875,
    "duration_minutes": 287.1000000000000227373675443232059478759765625,
    "overlap_duration_s": 17227,
    "speed_a_avg": 0.0299999999999999988897769753748434595763683319091796875,
    "speed_a_std": 0.05000000000000000277555756156289135105907917022705078125,
    "speed_b_avg": 0.0200000000000000004163336342344337026588618755340576171875,
    "speed_b_std": 0.040000000000000000832667268468867405317723751068115234375,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.0299999999999999988897769753748434595763683319091796875,
            "max_sog": 0.1000000000000000055511151231257827021181583404541015625
        },
        "vessel_b": {
            "avg_sog": 0.0200000000000000004163336342344337026588618755340576171875,
            "max_sog": 0.1000000000000000055511151231257827021181583404541015625
        }
    },
    "time_window": {
        "start": "2026-10-27T04:04:49+00:00",
        "end": "2026-10-27T08:51:56+00:00"
    },
    "points_count": {
        "vessel_a": 14,
        "vessel_b": 14
    },
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "score": {
        "value": 95,
        "components": {
            "distance_tightness": {
                "score": 25,
                "max": 25,
                "detail": "Min distance 10m, avg 12m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 287 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b11m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Sakhalin South Approach"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (FLAGMAN and AZOV) maintained close proximity (min 10m, avg 12m) for 287 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Sakhalin South Approach, a known STS activity area."
    },
    "sar": {
        "status": "inconclusive",
        "centroid": {
            "lat": 46.62401539999999755536919110454618930816650390625,
            "lon": 142.769123699999994414611137472093105316162109375
        },
        "time_window": {
            "start_ts": "2026-10-27T04:04:49+00:00",
            "end_ts": "2026-10-27T08:51:56+00:00"
        },
        "searched_at": "2026-10-27T09:45:07.279576+00:00",
        "scene_id": "S1C_IW_GRDH_1SDV_20261027T081918_20261027T081955_010068_01418C_959E_COG",
        "scene_datetime": "2026-10-27T08:19:18.858484Z",
        "platform": "sentinel-1c",
        "bbox": {
            "min_lon": 141.228850999999991699951351620256900787353515625,
            "min_lat": 44.51316800000000029058355721645057201385498046875,
            "max_lon": 144.993438999999995075995684601366519927978515625,
            "max_lat": 47.07320399999999693818608648143708705902099609375
        },
        "assets": {
            "preview_url": "https:\/\/fleetleaks.com\/wp-content\/uploads\/fleetleaks-evidence\/sar-imagery\/2026\/10\/event_1580669_thumbnail_20261027094510.png",
            "stored_path": "\/home\/fleetleaks\/public_html\/wp-content\/uploads\/fleetleaks-evidence\/sar-imagery\/2026\/10\/event_1580669_thumbnail_20261027094510.png",
            "source": "copernicus_dataspace"
        },
        "notes": "Preview available for manual review"
    }
}
Methodology: 2026.01.18
Zone Dwell Prigorodnoye/Sakhalin LNG
Oct 27, 2026 04:04 UTC 80.0% ▼
  • Zone: Prigorodnoye/Sakhalin LNG
  • Duration: 6h 29m
  • Data Points: 16 AIS positions
  • Period: 2026-10-27T04:19:48+00:00 to 2026-10-27T10:48:57+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "dwell_minutes": 389.1000000000000227373675443232059478759765625,
    "points_in_zone": 16,
    "first_point": {
        "ts": "2026-10-27T04:19:48+00:00",
        "lat": 46.6240667000000001962689566425979137420654296875,
        "lon": 142.769100000000008776623872108757495880126953125
    },
    "last_point": {
        "ts": "2026-10-27T10:48:57+00:00",
        "lat": 46.6240667000000001962689566425979137420654296875,
        "lon": 142.769116700000012087912182323634624481201171875
    }
}
Methodology: 2026.01.18
Zone Dwell Sakhalin South Approach
Oct 27, 2026 04:04 UTC 80.0% ▼
  • Zone: Sakhalin South Approach
  • Duration: 6h 29m
  • Data Points: 16 AIS positions
  • Period: 2026-10-27T04:19:48+00:00 to 2026-10-27T10:48:57+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "dwell_minutes": 389.1000000000000227373675443232059478759765625,
    "points_in_zone": 16,
    "first_point": {
        "ts": "2026-10-27T04:19:48+00:00",
        "lat": 46.6240667000000001962689566425979137420654296875,
        "lon": 142.769100000000008776623872108757495880126953125
    },
    "last_point": {
        "ts": "2026-10-27T10:48:57+00:00",
        "lat": 46.6240667000000001962689566425979137420654296875,
        "lon": 142.769116700000012087912182323634624481201171875
    }
}
Methodology: 2026.01.18
Loiter Prigorodnoye/Sakhalin LNG
Oct 27, 2026 04:04 UTC 75.0% ▼
  • Duration: 6h 29m
  • Radius: 2 meters
  • Data Points: 16 AIS positions
  • Centroid: 46.6241, 142.7691
  • Zone: Prigorodnoye/Sakhalin LNG
Show Raw Evidence JSON
{
    "radius_m": 2.100000000000000088817841970012523233890533447265625,
    "duration_minutes": 389.1000000000000227373675443232059478759765625,
    "points": 16,
    "centroid": {
        "lat": 46.62406564999999858400769880972802639007568359375,
        "lon": 142.7691081374999839681549929082393646240234375
    },
    "bbox": {
        "min_lat": 46.6240499999999968849806464277207851409912109375,
        "min_lon": 142.769100000000008776623872108757495880126953125,
        "max_lat": 46.62408330000000233894752454943954944610595703125,
        "max_lon": 142.7691317000000026382622309029102325439453125
    },
    "zone_id": "russia_prigorodnoye"
}
Methodology: 2026.01.18
Loiter Sakhalin South Approach
Oct 27, 2026 04:04 UTC 75.0% ▼
  • Duration: 6h 29m
  • Radius: 2 meters
  • Data Points: 16 AIS positions
  • Centroid: 46.6241, 142.7691
  • Zone: Sakhalin South Approach
Show Raw Evidence JSON
{
    "radius_m": 2.100000000000000088817841970012523233890533447265625,
    "duration_minutes": 389.1000000000000227373675443232059478759765625,
    "points": 16,
    "centroid": {
        "lat": 46.62406564999999858400769880972802639007568359375,
        "lon": 142.7691081374999839681549929082393646240234375
    },
    "bbox": {
        "min_lat": 46.6240499999999968849806464277207851409912109375,
        "min_lon": 142.769100000000008776623872108757495880126953125,
        "max_lat": 46.62408330000000233894752454943954944610595703125,
        "max_lon": 142.7691317000000026382622309029102325439453125
    },
    "zone_id": "russia_sakhalin_south"
}
Methodology: 2026.01.18
Sts Prigorodnoye/Sakhalin LNG
Oct 27, 2026 02:16 UTC 85/100 ▼
Vessel A: IMO 8135215 (FLAGMAN) Russia
Vessel B: IMO 8930744 (ZAPRAVSHCHIK 05) Russia
  • Minimum Distance: 290 meters
  • Average Distance: 292 meters
  • Duration: 2h 3m
  • Period: 2026-10-27T02:16:47+00:00 to 2026-10-27T04:19:48+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Prigorodnoye/Sakhalin LNG

Confidence Analysis

Score: 85/100

High-confidence STS candidate. Two tankers (FLAGMAN and ZAPRAVSHCHIK 05) maintained close proximity (min 290m, avg 292m) for 123 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Prigorodnoye/Sakhalin LNG, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness15/25Min distance 290m, avg 292m
Duration25/25Duration 123 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±1m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Prigorodnoye/Sakhalin LNG
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273443820,
        "imo": 8135215,
        "name": "FLAGMAN",
        "flag": "Russia"
    },
    "vessel_b": {
        "mmsi": 273439180,
        "imo": 8930744,
        "name": "ZAPRAVSHCHIK 05",
        "flag": "Russia"
    },
    "min_distance_m": 289.8999999999999772626324556767940521240234375,
    "avg_distance_m": 291.5,
    "distance_consistency_m": 0.90000000000000002220446049250313080847263336181640625,
    "duration_minutes": 123,
    "overlap_duration_s": 7381,
    "speed_a_avg": 0.0200000000000000004163336342344337026588618755340576171875,
    "speed_a_std": 0.040000000000000000832667268468867405317723751068115234375,
    "speed_b_avg": 0.0200000000000000004163336342344337026588618755340576171875,
    "speed_b_std": 0.040000000000000000832667268468867405317723751068115234375,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.0200000000000000004163336342344337026588618755340576171875,
            "max_sog": 0.1000000000000000055511151231257827021181583404541015625
        },
        "vessel_b": {
            "avg_sog": 0.0200000000000000004163336342344337026588618755340576171875,
            "max_sog": 0.1000000000000000055511151231257827021181583404541015625
        }
    },
    "time_window": {
        "start": "2026-10-27T02:16:47+00:00",
        "end": "2026-10-27T04:19:48+00:00"
    },
    "points_count": {
        "vessel_a": 9,
        "vessel_b": 9
    },
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "score": {
        "value": 85,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 290m, avg 292m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 123 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b11m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Prigorodnoye\/Sakhalin LNG"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (FLAGMAN and ZAPRAVSHCHIK 05) maintained close proximity (min 290m, avg 292m) for 123 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Prigorodnoye\/Sakhalin LNG, a known STS activity area."
    }
}
Methodology: 2026.01.18
Sts Sakhalin South Approach
Oct 27, 2026 02:16 UTC 85/100 ▼
Vessel A: IMO 8135215 (FLAGMAN) Russia
Vessel B: IMO 8930744 (ZAPRAVSHCHIK 05) Russia
  • Minimum Distance: 290 meters
  • Average Distance: 292 meters
  • Duration: 2h 3m
  • Period: 2026-10-27T02:16:47+00:00 to 2026-10-27T04:19:48+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Sakhalin South Approach

Confidence Analysis

Score: 85/100

High-confidence STS candidate. Two tankers (FLAGMAN and ZAPRAVSHCHIK 05) maintained close proximity (min 290m, avg 292m) for 123 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Sakhalin South Approach, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness15/25Min distance 290m, avg 292m
Duration25/25Duration 123 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±1m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Sakhalin South Approach
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273443820,
        "imo": 8135215,
        "name": "FLAGMAN",
        "flag": "Russia"
    },
    "vessel_b": {
        "mmsi": 273439180,
        "imo": 8930744,
        "name": "ZAPRAVSHCHIK 05",
        "flag": "Russia"
    },
    "min_distance_m": 289.8999999999999772626324556767940521240234375,
    "avg_distance_m": 291.5,
    "distance_consistency_m": 0.90000000000000002220446049250313080847263336181640625,
    "duration_minutes": 123,
    "overlap_duration_s": 7381,
    "speed_a_avg": 0.0200000000000000004163336342344337026588618755340576171875,
    "speed_a_std": 0.040000000000000000832667268468867405317723751068115234375,
    "speed_b_avg": 0.0200000000000000004163336342344337026588618755340576171875,
    "speed_b_std": 0.040000000000000000832667268468867405317723751068115234375,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.0200000000000000004163336342344337026588618755340576171875,
            "max_sog": 0.1000000000000000055511151231257827021181583404541015625
        },
        "vessel_b": {
            "avg_sog": 0.0200000000000000004163336342344337026588618755340576171875,
            "max_sog": 0.1000000000000000055511151231257827021181583404541015625
        }
    },
    "time_window": {
        "start": "2026-10-27T02:16:47+00:00",
        "end": "2026-10-27T04:19:48+00:00"
    },
    "points_count": {
        "vessel_a": 9,
        "vessel_b": 9
    },
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "score": {
        "value": 85,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 290m, avg 292m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 123 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b11m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Sakhalin South Approach"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (FLAGMAN and ZAPRAVSHCHIK 05) maintained close proximity (min 290m, avg 292m) for 123 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Sakhalin South Approach, a known STS activity area."
    }
}
Methodology: 2026.01.18
Sts Prigorodnoye/Sakhalin LNG
Oct 27, 2026 02:04 UTC 95/100 ▼
Vessel A: IMO 8135215 (FLAGMAN) Russia
Vessel B: IMO 9084401 (AZOV) Russia
  • Minimum Distance: 10 meters
  • Average Distance: 12 meters
  • Duration: 6h 17m
  • Period: 2026-10-27T02:34:47+00:00 to 2026-10-27T08:51:56+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Prigorodnoye/Sakhalin LNG

Confidence Analysis

Score: 95/100

High-confidence STS candidate. Two tankers (FLAGMAN and AZOV) maintained close proximity (min 10m, avg 12m) for 377 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Prigorodnoye/Sakhalin LNG, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness25/25Min distance 10m, avg 12m
Duration25/25Duration 377 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±1m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Prigorodnoye/Sakhalin LNG
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273443820,
        "imo": 8135215,
        "name": "FLAGMAN",
        "flag": "Russia"
    },
    "vessel_b": {
        "mmsi": 273456730,
        "imo": 9084401,
        "name": "AZOV",
        "flag": "Russia"
    },
    "min_distance_m": 9.800000000000000710542735760100185871124267578125,
    "avg_distance_m": 11.9000000000000003552713678800500929355621337890625,
    "distance_consistency_m": 1.1999999999999999555910790149937383830547332763671875,
    "duration_minutes": 377.1000000000000227373675443232059478759765625,
    "overlap_duration_s": 22629,
    "speed_a_avg": 0.0299999999999999988897769753748434595763683319091796875,
    "speed_a_std": 0.05000000000000000277555756156289135105907917022705078125,
    "speed_b_avg": 0.0299999999999999988897769753748434595763683319091796875,
    "speed_b_std": 0.059999999999999997779553950749686919152736663818359375,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.0299999999999999988897769753748434595763683319091796875,
            "max_sog": 0.1000000000000000055511151231257827021181583404541015625
        },
        "vessel_b": {
            "avg_sog": 0.0299999999999999988897769753748434595763683319091796875,
            "max_sog": 0.200000000000000011102230246251565404236316680908203125
        }
    },
    "time_window": {
        "start": "2026-10-27T02:34:47+00:00",
        "end": "2026-10-27T08:51:56+00:00"
    },
    "points_count": {
        "vessel_a": 18,
        "vessel_b": 18
    },
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "score": {
        "value": 95,
        "components": {
            "distance_tightness": {
                "score": 25,
                "max": 25,
                "detail": "Min distance 10m, avg 12m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 377 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b11m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Prigorodnoye\/Sakhalin LNG"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (FLAGMAN and AZOV) maintained close proximity (min 10m, avg 12m) for 377 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Prigorodnoye\/Sakhalin LNG, a known STS activity area."
    }
}
Methodology: 2026.01.18
Sts Sakhalin South Approach
Oct 27, 2026 02:04 UTC 95/100 ▼
Vessel A: IMO 8135215 (FLAGMAN) Russia
Vessel B: IMO 9084401 (AZOV) Russia
  • Minimum Distance: 10 meters
  • Average Distance: 12 meters
  • Duration: 6h 17m
  • Period: 2026-10-27T02:34:47+00:00 to 2026-10-27T08:51:56+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Sakhalin South Approach

Confidence Analysis

Score: 95/100

High-confidence STS candidate. Two tankers (FLAGMAN and AZOV) maintained close proximity (min 10m, avg 12m) for 377 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Sakhalin South Approach, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness25/25Min distance 10m, avg 12m
Duration25/25Duration 377 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±1m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Sakhalin South Approach
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273443820,
        "imo": 8135215,
        "name": "FLAGMAN",
        "flag": "Russia"
    },
    "vessel_b": {
        "mmsi": 273456730,
        "imo": 9084401,
        "name": "AZOV",
        "flag": "Russia"
    },
    "min_distance_m": 9.800000000000000710542735760100185871124267578125,
    "avg_distance_m": 11.9000000000000003552713678800500929355621337890625,
    "distance_consistency_m": 1.1999999999999999555910790149937383830547332763671875,
    "duration_minutes": 377.1000000000000227373675443232059478759765625,
    "overlap_duration_s": 22629,
    "speed_a_avg": 0.0299999999999999988897769753748434595763683319091796875,
    "speed_a_std": 0.05000000000000000277555756156289135105907917022705078125,
    "speed_b_avg": 0.0299999999999999988897769753748434595763683319091796875,
    "speed_b_std": 0.059999999999999997779553950749686919152736663818359375,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.0299999999999999988897769753748434595763683319091796875,
            "max_sog": 0.1000000000000000055511151231257827021181583404541015625
        },
        "vessel_b": {
            "avg_sog": 0.0299999999999999988897769753748434595763683319091796875,
            "max_sog": 0.200000000000000011102230246251565404236316680908203125
        }
    },
    "time_window": {
        "start": "2026-10-27T02:34:47+00:00",
        "end": "2026-10-27T08:51:56+00:00"
    },
    "points_count": {
        "vessel_a": 18,
        "vessel_b": 18
    },
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "score": {
        "value": 95,
        "components": {
            "distance_tightness": {
                "score": 25,
                "max": 25,
                "detail": "Min distance 10m, avg 12m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 377 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b11m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Sakhalin South Approach"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (FLAGMAN and AZOV) maintained close proximity (min 10m, avg 12m) for 377 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Sakhalin South Approach, a known STS activity area."
    }
}
Methodology: 2026.01.18
Zone Dwell Sakhalin South Approach
Oct 27, 2026 02:01 UTC 80.0% ▼
  • Zone: Sakhalin South Approach
  • Duration: 6h 23m
  • Data Points: 20 AIS positions
  • Period: 2026-10-27T02:28:47+00:00 to 2026-10-27T08:51:56+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "dwell_minutes": 383.1000000000000227373675443232059478759765625,
    "points_in_zone": 20,
    "first_point": {
        "ts": "2026-10-27T02:28:47+00:00",
        "lat": 46.62408330000000233894752454943954944610595703125,
        "lon": 142.769100000000008776623872108757495880126953125
    },
    "last_point": {
        "ts": "2026-10-27T08:51:56+00:00",
        "lat": 46.6240499999999968849806464277207851409912109375,
        "lon": 142.769100000000008776623872108757495880126953125
    }
}
Methodology: 2026.01.18
Zone Dwell Prigorodnoye/Sakhalin LNG
Oct 27, 2026 02:01 UTC 80.0% ▼
  • Zone: Prigorodnoye/Sakhalin LNG
  • Duration: 6h 23m
  • Data Points: 20 AIS positions
  • Period: 2026-10-27T02:28:47+00:00 to 2026-10-27T08:51:56+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "dwell_minutes": 383.1000000000000227373675443232059478759765625,
    "points_in_zone": 20,
    "first_point": {
        "ts": "2026-10-27T02:28:47+00:00",
        "lat": 46.62408330000000233894752454943954944610595703125,
        "lon": 142.769100000000008776623872108757495880126953125
    },
    "last_point": {
        "ts": "2026-10-27T08:51:56+00:00",
        "lat": 46.6240499999999968849806464277207851409912109375,
        "lon": 142.769100000000008776623872108757495880126953125
    }
}
Methodology: 2026.01.18
Loiter Prigorodnoye/Sakhalin LNG
Oct 27, 2026 02:01 UTC 75.0% ▼
  • Duration: 6h 23m
  • Radius: 2 meters
  • Data Points: 20 AIS positions
  • Centroid: 46.6241, 142.7691
  • Zone: Prigorodnoye/Sakhalin LNG
Show Raw Evidence JSON
{
    "radius_m": 2.399999999999999911182158029987476766109466552734375,
    "duration_minutes": 383.1000000000000227373675443232059478759765625,
    "points": 20,
    "centroid": {
        "lat": 46.6240708449999914364525466226041316986083984375,
        "lon": 142.769109765000024481196305714547634124755859375
    },
    "bbox": {
        "min_lat": 46.6240499999999968849806464277207851409912109375,
        "min_lon": 142.769100000000008776623872108757495880126953125,
        "max_lat": 46.62408330000000233894752454943954944610595703125,
        "max_lon": 142.7691317000000026382622309029102325439453125
    },
    "zone_id": "russia_prigorodnoye"
}
Methodology: 2026.01.18
Loiter Sakhalin South Approach
Oct 27, 2026 02:01 UTC 75.0% ▼
  • Duration: 6h 23m
  • Radius: 2 meters
  • Data Points: 20 AIS positions
  • Centroid: 46.6241, 142.7691
  • Zone: Sakhalin South Approach
Show Raw Evidence JSON
{
    "radius_m": 2.399999999999999911182158029987476766109466552734375,
    "duration_minutes": 383.1000000000000227373675443232059478759765625,
    "points": 20,
    "centroid": {
        "lat": 46.6240708449999914364525466226041316986083984375,
        "lon": 142.769109765000024481196305714547634124755859375
    },
    "bbox": {
        "min_lat": 46.6240499999999968849806464277207851409912109375,
        "min_lon": 142.769100000000008776623872108757495880126953125,
        "max_lat": 46.62408330000000233894752454943954944610595703125,
        "max_lon": 142.7691317000000026382622309029102325439453125
    },
    "zone_id": "russia_sakhalin_south"
}
Methodology: 2026.01.18
Sts🛰️✗ Prigorodnoye/Sakhalin LNG
Oct 27, 2026 01:20 UTC 90/100 ▼
Vessel A: IMO 9084401 (AZOV) Russia
Vessel B: IMO 8135215 (FLAGMAN) Russia
  • Minimum Distance: 8 meters
  • Average Distance: 12 meters
  • Duration: 1h 37m
  • Period: 2026-10-27T01:20:18+00:00 to 2026-10-27T02:57:58+00:00
  • Vessel A Avg Speed: 0.1 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Prigorodnoye/Sakhalin LNG

Confidence Analysis

Score: 90/100

High-confidence STS candidate. Two tankers (AZOV and FLAGMAN) maintained close proximity (min 8m, avg 12m) for 98 minutes. Both vessels were slow-moving (avg speeds 0.1 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Prigorodnoye/Sakhalin LNG, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness25/25Min distance 8m, avg 12m
Duration20/25Duration 98 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±2m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Prigorodnoye/Sakhalin LNG

🛰️ Satellite Corroboration

✗ SAR Not Available

No satellite imagery for this time/location

No Sentinel-1 scenes covering AOI and time window

Searched: 2026-10-27T07:45:01.723405+00:00

Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273456730,
        "imo": 9084401,
        "name": "AZOV",
        "flag": "Russia"
    },
    "vessel_b": {
        "mmsi": 273443820,
        "imo": 8135215,
        "name": "FLAGMAN",
        "flag": "Russia"
    },
    "min_distance_m": 8,
    "avg_distance_m": 11.5,
    "distance_consistency_m": 2.100000000000000088817841970012523233890533447265625,
    "duration_minutes": 97.7000000000000028421709430404007434844970703125,
    "overlap_duration_s": 5860,
    "speed_a_avg": 0.070000000000000006661338147750939242541790008544921875,
    "speed_a_std": 0.070000000000000006661338147750939242541790008544921875,
    "speed_b_avg": 0.0299999999999999988897769753748434595763683319091796875,
    "speed_b_std": 0.040000000000000000832667268468867405317723751068115234375,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.070000000000000006661338147750939242541790008544921875,
            "max_sog": 0.200000000000000011102230246251565404236316680908203125
        },
        "vessel_b": {
            "avg_sog": 0.0299999999999999988897769753748434595763683319091796875,
            "max_sog": 0.1000000000000000055511151231257827021181583404541015625
        }
    },
    "time_window": {
        "start": "2026-10-27T01:20:18+00:00",
        "end": "2026-10-27T02:57:58+00:00"
    },
    "points_count": {
        "vessel_a": 27,
        "vessel_b": 27
    },
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "score": {
        "value": 90,
        "components": {
            "distance_tightness": {
                "score": 25,
                "max": 25,
                "detail": "Min distance 8m, avg 12m"
            },
            "duration": {
                "score": 20,
                "max": 25,
                "detail": "Duration 98 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b12m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Prigorodnoye\/Sakhalin LNG"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (AZOV and FLAGMAN) maintained close proximity (min 8m, avg 12m) for 98 minutes. Both vessels were slow-moving (avg speeds 0.1 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Prigorodnoye\/Sakhalin LNG, a known STS activity area."
    },
    "sar": {
        "status": "not_found",
        "centroid": {
            "lat": 46.624026299999997036138665862381458282470703125,
            "lon": 142.7691277000000127372913993895053863525390625
        },
        "time_window": {
            "start_ts": "2026-10-27T01:20:18+00:00",
            "end_ts": "2026-10-27T02:57:58+00:00"
        },
        "searched_at": "2026-10-27T07:45:01.723405+00:00",
        "notes": "No Sentinel-1 scenes covering AOI and time window"
    }
}
Methodology: 2026.01.18
Sts🛰️✗ Sakhalin South Approach
Oct 27, 2026 01:20 UTC 90/100 ▼
Vessel A: IMO 9084401 (AZOV) Russia
Vessel B: IMO 8135215 (FLAGMAN) Russia
  • Minimum Distance: 8 meters
  • Average Distance: 12 meters
  • Duration: 1h 37m
  • Period: 2026-10-27T01:20:18+00:00 to 2026-10-27T02:57:58+00:00
  • Vessel A Avg Speed: 0.1 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Sakhalin South Approach

Confidence Analysis

Score: 90/100

High-confidence STS candidate. Two tankers (AZOV and FLAGMAN) maintained close proximity (min 8m, avg 12m) for 98 minutes. Both vessels were slow-moving (avg speeds 0.1 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Sakhalin South Approach, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness25/25Min distance 8m, avg 12m
Duration20/25Duration 98 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±2m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Sakhalin South Approach

🛰️ Satellite Corroboration

✗ SAR Not Available

No satellite imagery for this time/location

No Sentinel-1 scenes covering AOI and time window

Searched: 2026-10-27T07:45:04.217598+00:00

Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273456730,
        "imo": 9084401,
        "name": "AZOV",
        "flag": "Russia"
    },
    "vessel_b": {
        "mmsi": 273443820,
        "imo": 8135215,
        "name": "FLAGMAN",
        "flag": "Russia"
    },
    "min_distance_m": 8,
    "avg_distance_m": 11.5,
    "distance_consistency_m": 2.100000000000000088817841970012523233890533447265625,
    "duration_minutes": 97.7000000000000028421709430404007434844970703125,
    "overlap_duration_s": 5860,
    "speed_a_avg": 0.070000000000000006661338147750939242541790008544921875,
    "speed_a_std": 0.070000000000000006661338147750939242541790008544921875,
    "speed_b_avg": 0.0299999999999999988897769753748434595763683319091796875,
    "speed_b_std": 0.040000000000000000832667268468867405317723751068115234375,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.070000000000000006661338147750939242541790008544921875,
            "max_sog": 0.200000000000000011102230246251565404236316680908203125
        },
        "vessel_b": {
            "avg_sog": 0.0299999999999999988897769753748434595763683319091796875,
            "max_sog": 0.1000000000000000055511151231257827021181583404541015625
        }
    },
    "time_window": {
        "start": "2026-10-27T01:20:18+00:00",
        "end": "2026-10-27T02:57:58+00:00"
    },
    "points_count": {
        "vessel_a": 27,
        "vessel_b": 27
    },
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "score": {
        "value": 90,
        "components": {
            "distance_tightness": {
                "score": 25,
                "max": 25,
                "detail": "Min distance 8m, avg 12m"
            },
            "duration": {
                "score": 20,
                "max": 25,
                "detail": "Duration 98 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b12m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Sakhalin South Approach"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (AZOV and FLAGMAN) maintained close proximity (min 8m, avg 12m) for 98 minutes. Both vessels were slow-moving (avg speeds 0.1 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Sakhalin South Approach, a known STS activity area."
    },
    "sar": {
        "status": "not_found",
        "centroid": {
            "lat": 46.624026299999997036138665862381458282470703125,
            "lon": 142.7691277000000127372913993895053863525390625
        },
        "time_window": {
            "start_ts": "2026-10-27T01:20:18+00:00",
            "end_ts": "2026-10-27T02:57:58+00:00"
        },
        "searched_at": "2026-10-27T07:45:04.217598+00:00",
        "notes": "No Sentinel-1 scenes covering AOI and time window"
    }
}
Methodology: 2026.01.18
Zone Dwell Sakhalin South Approach
Oct 27, 2026 01:16 UTC 80.0% ▼
  • Zone: Sakhalin South Approach
  • Duration: 6h 27m
  • Data Points: 29 AIS positions
  • Period: 2026-10-27T01:25:47+00:00 to 2026-10-27T07:52:50+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "dwell_minutes": 387.1000000000000227373675443232059478759765625,
    "points_in_zone": 29,
    "first_point": {
        "ts": "2026-10-27T01:25:47+00:00",
        "lat": 46.6240667000000001962689566425979137420654296875,
        "lon": 142.7691317000000026382622309029102325439453125
    },
    "last_point": {
        "ts": "2026-10-27T07:52:50+00:00",
        "lat": 46.6240667000000001962689566425979137420654296875,
        "lon": 142.769100000000008776623872108757495880126953125
    }
}
Methodology: 2026.01.18
Zone Dwell Prigorodnoye/Sakhalin LNG
Oct 27, 2026 01:16 UTC 80.0% ▼
  • Zone: Prigorodnoye/Sakhalin LNG
  • Duration: 6h 27m
  • Data Points: 29 AIS positions
  • Period: 2026-10-27T01:25:47+00:00 to 2026-10-27T07:52:50+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "dwell_minutes": 387.1000000000000227373675443232059478759765625,
    "points_in_zone": 29,
    "first_point": {
        "ts": "2026-10-27T01:25:47+00:00",
        "lat": 46.6240667000000001962689566425979137420654296875,
        "lon": 142.7691317000000026382622309029102325439453125
    },
    "last_point": {
        "ts": "2026-10-27T07:52:50+00:00",
        "lat": 46.6240667000000001962689566425979137420654296875,
        "lon": 142.769100000000008776623872108757495880126953125
    }
}
Methodology: 2026.01.18
Loiter Prigorodnoye/Sakhalin LNG
Oct 27, 2026 01:16 UTC 75.0% ▼
  • Duration: 6h 27m
  • Radius: 5 meters
  • Data Points: 29 AIS positions
  • Centroid: 46.6241, 142.7691
  • Zone: Prigorodnoye/Sakhalin LNG
Show Raw Evidence JSON
{
    "radius_m": 5.4000000000000003552713678800500929355621337890625,
    "duration_minutes": 387.1000000000000227373675443232059478759765625,
    "points": 29,
    "centroid": {
        "lat": 46.6240747206896486432015080936253070831298828125,
        "lon": 142.76911409999996749320416711270809173583984375
    },
    "bbox": {
        "min_lat": 46.6240499999999968849806464277207851409912109375,
        "min_lon": 142.769100000000008776623872108757495880126953125,
        "max_lat": 46.62411670000000185609678737819194793701171875,
        "max_lon": 142.769149999999996225596987642347812652587890625
    },
    "zone_id": "russia_prigorodnoye"
}
Methodology: 2026.01.18
Loiter Sakhalin South Approach
Oct 27, 2026 01:16 UTC 75.0% ▼
  • Duration: 6h 27m
  • Radius: 5 meters
  • Data Points: 29 AIS positions
  • Centroid: 46.6241, 142.7691
  • Zone: Sakhalin South Approach
Show Raw Evidence JSON
{
    "radius_m": 5.4000000000000003552713678800500929355621337890625,
    "duration_minutes": 387.1000000000000227373675443232059478759765625,
    "points": 29,
    "centroid": {
        "lat": 46.6240747206896486432015080936253070831298828125,
        "lon": 142.76911409999996749320416711270809173583984375
    },
    "bbox": {
        "min_lat": 46.6240499999999968849806464277207851409912109375,
        "min_lon": 142.769100000000008776623872108757495880126953125,
        "max_lat": 46.62411670000000185609678737819194793701171875,
        "max_lon": 142.769149999999996225596987642347812652587890625
    },
    "zone_id": "russia_sakhalin_south"
}
Methodology: 2026.01.18
Sts🛰️✗ Prigorodnoye/Sakhalin LNG
Oct 27, 2026 01:06 UTC 80/100 ▼
Vessel A: IMO 8930744 (ZAPRAVSHCHIK 05) Russia
Vessel B: IMO 8135215 (FLAGMAN) Russia
  • Minimum Distance: 289 meters
  • Average Distance: 292 meters
  • Duration: 1h 54m
  • Period: 2026-10-27T01:06:47+00:00 to 2026-10-27T03:00:46+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Prigorodnoye/Sakhalin LNG

Confidence Analysis

Score: 80/100

High-confidence STS candidate. Two tankers (ZAPRAVSHCHIK 05 and FLAGMAN) maintained close proximity (min 289m, avg 292m) for 114 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Prigorodnoye/Sakhalin LNG, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness15/25Min distance 289m, avg 292m
Duration20/25Duration 114 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±1m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Prigorodnoye/Sakhalin LNG

🛰️ Satellite Corroboration

✗ SAR Not Available

No satellite imagery for this time/location

No Sentinel-1 scenes covering AOI and time window

Searched: 2026-10-27T07:30:01.935528+00:00

Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273439180,
        "imo": 8930744,
        "name": "ZAPRAVSHCHIK 05",
        "flag": "Russia"
    },
    "vessel_b": {
        "mmsi": 273443820,
        "imo": 8135215,
        "name": "FLAGMAN",
        "flag": "Russia"
    },
    "min_distance_m": 289,
    "avg_distance_m": 291.6000000000000227373675443232059478759765625,
    "distance_consistency_m": 1,
    "duration_minutes": 114,
    "overlap_duration_s": 6839,
    "speed_a_avg": 0.01000000000000000020816681711721685132943093776702880859375,
    "speed_a_std": 0.0299999999999999988897769753748434595763683319091796875,
    "speed_b_avg": 0.01000000000000000020816681711721685132943093776702880859375,
    "speed_b_std": 0.0299999999999999988897769753748434595763683319091796875,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.01000000000000000020816681711721685132943093776702880859375,
            "max_sog": 0.1000000000000000055511151231257827021181583404541015625
        },
        "vessel_b": {
            "avg_sog": 0.01000000000000000020816681711721685132943093776702880859375,
            "max_sog": 0.1000000000000000055511151231257827021181583404541015625
        }
    },
    "time_window": {
        "start": "2026-10-27T01:06:47+00:00",
        "end": "2026-10-27T03:00:46+00:00"
    },
    "points_count": {
        "vessel_a": 10,
        "vessel_b": 10
    },
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "score": {
        "value": 80,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 289m, avg 292m"
            },
            "duration": {
                "score": 20,
                "max": 25,
                "detail": "Duration 114 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b11m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Prigorodnoye\/Sakhalin LNG"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (ZAPRAVSHCHIK 05 and FLAGMAN) maintained close proximity (min 289m, avg 292m) for 114 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Prigorodnoye\/Sakhalin LNG, a known STS activity area."
    },
    "sar": {
        "status": "not_found",
        "centroid": {
            "lat": 46.6248202000000020461811800487339496612548828125,
            "lon": 142.76753830000001244115992449223995208740234375
        },
        "time_window": {
            "start_ts": "2026-10-27T01:06:47+00:00",
            "end_ts": "2026-10-27T03:00:46+00:00"
        },
        "searched_at": "2026-10-27T07:30:01.935528+00:00",
        "notes": "No Sentinel-1 scenes covering AOI and time window"
    }
}
Methodology: 2026.01.18
Sts🛰️✗ Sakhalin South Approach
Oct 27, 2026 01:06 UTC 80/100 ▼
Vessel A: IMO 8930744 (ZAPRAVSHCHIK 05) Russia
Vessel B: IMO 8135215 (FLAGMAN) Russia
  • Minimum Distance: 289 meters
  • Average Distance: 292 meters
  • Duration: 1h 54m
  • Period: 2026-10-27T01:06:47+00:00 to 2026-10-27T03:00:46+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Sakhalin South Approach

Confidence Analysis

Score: 80/100

High-confidence STS candidate. Two tankers (ZAPRAVSHCHIK 05 and FLAGMAN) maintained close proximity (min 289m, avg 292m) for 114 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Sakhalin South Approach, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness15/25Min distance 289m, avg 292m
Duration20/25Duration 114 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±1m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Sakhalin South Approach

🛰️ Satellite Corroboration

✗ SAR Not Available

No satellite imagery for this time/location

No Sentinel-1 scenes covering AOI and time window

Searched: 2026-10-27T07:30:09.971997+00:00

Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273439180,
        "imo": 8930744,
        "name": "ZAPRAVSHCHIK 05",
        "flag": "Russia"
    },
    "vessel_b": {
        "mmsi": 273443820,
        "imo": 8135215,
        "name": "FLAGMAN",
        "flag": "Russia"
    },
    "min_distance_m": 289,
    "avg_distance_m": 291.6000000000000227373675443232059478759765625,
    "distance_consistency_m": 1,
    "duration_minutes": 114,
    "overlap_duration_s": 6839,
    "speed_a_avg": 0.01000000000000000020816681711721685132943093776702880859375,
    "speed_a_std": 0.0299999999999999988897769753748434595763683319091796875,
    "speed_b_avg": 0.01000000000000000020816681711721685132943093776702880859375,
    "speed_b_std": 0.0299999999999999988897769753748434595763683319091796875,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.01000000000000000020816681711721685132943093776702880859375,
            "max_sog": 0.1000000000000000055511151231257827021181583404541015625
        },
        "vessel_b": {
            "avg_sog": 0.01000000000000000020816681711721685132943093776702880859375,
            "max_sog": 0.1000000000000000055511151231257827021181583404541015625
        }
    },
    "time_window": {
        "start": "2026-10-27T01:06:47+00:00",
        "end": "2026-10-27T03:00:46+00:00"
    },
    "points_count": {
        "vessel_a": 10,
        "vessel_b": 10
    },
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "score": {
        "value": 80,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 289m, avg 292m"
            },
            "duration": {
                "score": 20,
                "max": 25,
                "detail": "Duration 114 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b11m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Sakhalin South Approach"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (ZAPRAVSHCHIK 05 and FLAGMAN) maintained close proximity (min 289m, avg 292m) for 114 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Sakhalin South Approach, a known STS activity area."
    },
    "sar": {
        "status": "not_found",
        "centroid": {
            "lat": 46.6248202000000020461811800487339496612548828125,
            "lon": 142.76753830000001244115992449223995208740234375
        },
        "time_window": {
            "start_ts": "2026-10-27T01:06:47+00:00",
            "end_ts": "2026-10-27T03:00:46+00:00"
        },
        "searched_at": "2026-10-27T07:30:09.971997+00:00",
        "notes": "No Sentinel-1 scenes covering AOI and time window"
    }
}
Methodology: 2026.01.18
Sts Prigorodnoye/Sakhalin LNG
Oct 27, 2026 00:16 UTC 85/100 ▼
Vessel A: IMO 8930744 (ZAPRAVSHCHIK 05) Russia
Vessel B: IMO 8135215 (FLAGMAN) Russia
  • Minimum Distance: 289 meters
  • Average Distance: 292 meters
  • Duration: 2h 43m
  • Period: 2026-10-27T00:16:50+00:00 to 2026-10-27T03:00:46+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Prigorodnoye/Sakhalin LNG

Confidence Analysis

Score: 85/100

High-confidence STS candidate. Two tankers (ZAPRAVSHCHIK 05 and FLAGMAN) maintained close proximity (min 289m, avg 292m) for 164 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Prigorodnoye/Sakhalin LNG, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness15/25Min distance 289m, avg 292m
Duration25/25Duration 164 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±1m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Prigorodnoye/Sakhalin LNG
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273439180,
        "imo": 8930744,
        "name": "ZAPRAVSHCHIK 05",
        "flag": "Russia"
    },
    "vessel_b": {
        "mmsi": 273443820,
        "imo": 8135215,
        "name": "FLAGMAN",
        "flag": "Russia"
    },
    "min_distance_m": 289,
    "avg_distance_m": 291.69999999999998863131622783839702606201171875,
    "distance_consistency_m": 0.90000000000000002220446049250313080847263336181640625,
    "duration_minutes": 163.900000000000005684341886080801486968994140625,
    "overlap_duration_s": 9836,
    "speed_a_avg": 0.01000000000000000020816681711721685132943093776702880859375,
    "speed_a_std": 0.0299999999999999988897769753748434595763683319091796875,
    "speed_b_avg": 0.0200000000000000004163336342344337026588618755340576171875,
    "speed_b_std": 0.040000000000000000832667268468867405317723751068115234375,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.01000000000000000020816681711721685132943093776702880859375,
            "max_sog": 0.1000000000000000055511151231257827021181583404541015625
        },
        "vessel_b": {
            "avg_sog": 0.0200000000000000004163336342344337026588618755340576171875,
            "max_sog": 0.1000000000000000055511151231257827021181583404541015625
        }
    },
    "time_window": {
        "start": "2026-10-27T00:16:50+00:00",
        "end": "2026-10-27T03:00:46+00:00"
    },
    "points_count": {
        "vessel_a": 13,
        "vessel_b": 13
    },
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "score": {
        "value": 85,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 289m, avg 292m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 164 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b11m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Prigorodnoye\/Sakhalin LNG"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (ZAPRAVSHCHIK 05 and FLAGMAN) maintained close proximity (min 289m, avg 292m) for 164 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Prigorodnoye\/Sakhalin LNG, a known STS activity area."
    }
}
Methodology: 2026.01.18
Sts Sakhalin South Approach
Oct 27, 2026 00:16 UTC 85/100 ▼
Vessel A: IMO 8930744 (ZAPRAVSHCHIK 05) Russia
Vessel B: IMO 8135215 (FLAGMAN) Russia
  • Minimum Distance: 289 meters
  • Average Distance: 292 meters
  • Duration: 2h 43m
  • Period: 2026-10-27T00:16:50+00:00 to 2026-10-27T03:00:46+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Sakhalin South Approach

Confidence Analysis

Score: 85/100

High-confidence STS candidate. Two tankers (ZAPRAVSHCHIK 05 and FLAGMAN) maintained close proximity (min 289m, avg 292m) for 164 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Sakhalin South Approach, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness15/25Min distance 289m, avg 292m
Duration25/25Duration 164 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±1m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Sakhalin South Approach
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273439180,
        "imo": 8930744,
        "name": "ZAPRAVSHCHIK 05",
        "flag": "Russia"
    },
    "vessel_b": {
        "mmsi": 273443820,
        "imo": 8135215,
        "name": "FLAGMAN",
        "flag": "Russia"
    },
    "min_distance_m": 289,
    "avg_distance_m": 291.69999999999998863131622783839702606201171875,
    "distance_consistency_m": 0.90000000000000002220446049250313080847263336181640625,
    "duration_minutes": 163.900000000000005684341886080801486968994140625,
    "overlap_duration_s": 9836,
    "speed_a_avg": 0.01000000000000000020816681711721685132943093776702880859375,
    "speed_a_std": 0.0299999999999999988897769753748434595763683319091796875,
    "speed_b_avg": 0.0200000000000000004163336342344337026588618755340576171875,
    "speed_b_std": 0.040000000000000000832667268468867405317723751068115234375,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.01000000000000000020816681711721685132943093776702880859375,
            "max_sog": 0.1000000000000000055511151231257827021181583404541015625
        },
        "vessel_b": {
            "avg_sog": 0.0200000000000000004163336342344337026588618755340576171875,
            "max_sog": 0.1000000000000000055511151231257827021181583404541015625
        }
    },
    "time_window": {
        "start": "2026-10-27T00:16:50+00:00",
        "end": "2026-10-27T03:00:46+00:00"
    },
    "points_count": {
        "vessel_a": 13,
        "vessel_b": 13
    },
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "score": {
        "value": 85,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 289m, avg 292m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 164 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b11m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Sakhalin South Approach"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (ZAPRAVSHCHIK 05 and FLAGMAN) maintained close proximity (min 289m, avg 292m) for 164 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Sakhalin South Approach, a known STS activity area."
    }
}
Methodology: 2026.01.18
Sts Prigorodnoye/Sakhalin LNG
Oct 27, 2026 00:09 UTC 95/100 ▼
Vessel A: IMO 8135215 (FLAGMAN) Russia
Vessel B: IMO 9084401 (AZOV) Russia
  • Minimum Distance: 8 meters
  • Average Distance: 12 meters
  • Duration: 6h 18m
  • Period: 2026-10-27T00:58:46+00:00 to 2026-10-27T07:16:50+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.1 knots
  • Zone: Prigorodnoye/Sakhalin LNG

Confidence Analysis

Score: 95/100

High-confidence STS candidate. Two tankers (FLAGMAN and AZOV) maintained close proximity (min 8m, avg 12m) for 378 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.1 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Prigorodnoye/Sakhalin LNG, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness25/25Min distance 8m, avg 12m
Duration25/25Duration 378 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±2m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Prigorodnoye/Sakhalin LNG
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273443820,
        "imo": 8135215,
        "name": "FLAGMAN",
        "flag": "Russia"
    },
    "vessel_b": {
        "mmsi": 273456730,
        "imo": 9084401,
        "name": "AZOV",
        "flag": "Russia"
    },
    "min_distance_m": 8,
    "avg_distance_m": 11.9000000000000003552713678800500929355621337890625,
    "distance_consistency_m": 1.6999999999999999555910790149937383830547332763671875,
    "duration_minutes": 378.1000000000000227373675443232059478759765625,
    "overlap_duration_s": 22684,
    "speed_a_avg": 0.0299999999999999988897769753748434595763683319091796875,
    "speed_a_std": 0.05000000000000000277555756156289135105907917022705078125,
    "speed_b_avg": 0.05000000000000000277555756156289135105907917022705078125,
    "speed_b_std": 0.070000000000000006661338147750939242541790008544921875,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.0299999999999999988897769753748434595763683319091796875,
            "max_sog": 0.1000000000000000055511151231257827021181583404541015625
        },
        "vessel_b": {
            "avg_sog": 0.05000000000000000277555756156289135105907917022705078125,
            "max_sog": 0.200000000000000011102230246251565404236316680908203125
        }
    },
    "time_window": {
        "start": "2026-10-27T00:58:46+00:00",
        "end": "2026-10-27T07:16:50+00:00"
    },
    "points_count": {
        "vessel_a": 29,
        "vessel_b": 29
    },
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "score": {
        "value": 95,
        "components": {
            "distance_tightness": {
                "score": 25,
                "max": 25,
                "detail": "Min distance 8m, avg 12m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 378 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b12m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Prigorodnoye\/Sakhalin LNG"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (FLAGMAN and AZOV) maintained close proximity (min 8m, avg 12m) for 378 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.1 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Prigorodnoye\/Sakhalin LNG, a known STS activity area."
    }
}
Methodology: 2026.01.18
Sts Sakhalin South Approach
Oct 27, 2026 00:09 UTC 95/100 ▼
Vessel A: IMO 8135215 (FLAGMAN) Russia
Vessel B: IMO 9084401 (AZOV) Russia
  • Minimum Distance: 8 meters
  • Average Distance: 12 meters
  • Duration: 6h 18m
  • Period: 2026-10-27T00:58:46+00:00 to 2026-10-27T07:16:50+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.1 knots
  • Zone: Sakhalin South Approach

Confidence Analysis

Score: 95/100

High-confidence STS candidate. Two tankers (FLAGMAN and AZOV) maintained close proximity (min 8m, avg 12m) for 378 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.1 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Sakhalin South Approach, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness25/25Min distance 8m, avg 12m
Duration25/25Duration 378 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±2m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Sakhalin South Approach
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273443820,
        "imo": 8135215,
        "name": "FLAGMAN",
        "flag": "Russia"
    },
    "vessel_b": {
        "mmsi": 273456730,
        "imo": 9084401,
        "name": "AZOV",
        "flag": "Russia"
    },
    "min_distance_m": 8,
    "avg_distance_m": 11.9000000000000003552713678800500929355621337890625,
    "distance_consistency_m": 1.6999999999999999555910790149937383830547332763671875,
    "duration_minutes": 378.1000000000000227373675443232059478759765625,
    "overlap_duration_s": 22684,
    "speed_a_avg": 0.0299999999999999988897769753748434595763683319091796875,
    "speed_a_std": 0.05000000000000000277555756156289135105907917022705078125,
    "speed_b_avg": 0.05000000000000000277555756156289135105907917022705078125,
    "speed_b_std": 0.070000000000000006661338147750939242541790008544921875,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.0299999999999999988897769753748434595763683319091796875,
            "max_sog": 0.1000000000000000055511151231257827021181583404541015625
        },
        "vessel_b": {
            "avg_sog": 0.05000000000000000277555756156289135105907917022705078125,
            "max_sog": 0.200000000000000011102230246251565404236316680908203125
        }
    },
    "time_window": {
        "start": "2026-10-27T00:58:46+00:00",
        "end": "2026-10-27T07:16:50+00:00"
    },
    "points_count": {
        "vessel_a": 29,
        "vessel_b": 29
    },
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "score": {
        "value": 95,
        "components": {
            "distance_tightness": {
                "score": 25,
                "max": 25,
                "detail": "Min distance 8m, avg 12m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 378 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b12m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Sakhalin South Approach"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (FLAGMAN and AZOV) maintained close proximity (min 8m, avg 12m) for 378 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.1 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Sakhalin South Approach, a known STS activity area."
    }
}
Methodology: 2026.01.18
Zone Dwell Prigorodnoye/Sakhalin LNG
Oct 27, 2026 00:07 UTC 80.0% ▼
  • Zone: Prigorodnoye/Sakhalin LNG
  • Duration: 6h 21m
  • Data Points: 30 AIS positions
  • Period: 2026-10-27T00:55:46+00:00 to 2026-10-27T07:16:50+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "dwell_minutes": 381.1000000000000227373675443232059478759765625,
    "points_in_zone": 30,
    "first_point": {
        "ts": "2026-10-27T00:55:46+00:00",
        "lat": 46.62408330000000233894752454943954944610595703125,
        "lon": 142.769116700000012087912182323634624481201171875
    },
    "last_point": {
        "ts": "2026-10-27T07:16:50+00:00",
        "lat": 46.6240667000000001962689566425979137420654296875,
        "lon": 142.769100000000008776623872108757495880126953125
    }
}
Methodology: 2026.01.18
Zone Dwell Sakhalin South Approach
Oct 27, 2026 00:07 UTC 80.0% ▼
  • Zone: Sakhalin South Approach
  • Duration: 6h 21m
  • Data Points: 30 AIS positions
  • Period: 2026-10-27T00:55:46+00:00 to 2026-10-27T07:16:50+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "dwell_minutes": 381.1000000000000227373675443232059478759765625,
    "points_in_zone": 30,
    "first_point": {
        "ts": "2026-10-27T00:55:46+00:00",
        "lat": 46.62408330000000233894752454943954944610595703125,
        "lon": 142.769116700000012087912182323634624481201171875
    },
    "last_point": {
        "ts": "2026-10-27T07:16:50+00:00",
        "lat": 46.6240667000000001962689566425979137420654296875,
        "lon": 142.769100000000008776623872108757495880126953125
    }
}
Methodology: 2026.01.18
Loiter Prigorodnoye/Sakhalin LNG
Oct 27, 2026 00:07 UTC 75.0% ▼
  • Duration: 6h 21m
  • Radius: 5 meters
  • Data Points: 30 AIS positions
  • Centroid: 46.6241, 142.7691
  • Zone: Prigorodnoye/Sakhalin LNG
Show Raw Evidence JSON
{
    "radius_m": 5.29999999999999982236431605997495353221893310546875,
    "duration_minutes": 381.1000000000000227373675443232059478759765625,
    "points": 30,
    "centroid": {
        "lat": 46.62407555999998720608346047811210155487060546875,
        "lon": 142.769115299999981516521074809134006500244140625
    },
    "bbox": {
        "min_lat": 46.6240499999999968849806464277207851409912109375,
        "min_lon": 142.769100000000008776623872108757495880126953125,
        "max_lat": 46.62411670000000185609678737819194793701171875,
        "max_lon": 142.769149999999996225596987642347812652587890625
    },
    "zone_id": "russia_prigorodnoye"
}
Methodology: 2026.01.18
Loiter Sakhalin South Approach
Oct 27, 2026 00:07 UTC 75.0% ▼
  • Duration: 6h 21m
  • Radius: 5 meters
  • Data Points: 30 AIS positions
  • Centroid: 46.6241, 142.7691
  • Zone: Sakhalin South Approach
Show Raw Evidence JSON
{
    "radius_m": 5.29999999999999982236431605997495353221893310546875,
    "duration_minutes": 381.1000000000000227373675443232059478759765625,
    "points": 30,
    "centroid": {
        "lat": 46.62407555999998720608346047811210155487060546875,
        "lon": 142.769115299999981516521074809134006500244140625
    },
    "bbox": {
        "min_lat": 46.6240499999999968849806464277207851409912109375,
        "min_lon": 142.769100000000008776623872108757495880126953125,
        "max_lat": 46.62411670000000185609678737819194793701171875,
        "max_lon": 142.769149999999996225596987642347812652587890625
    },
    "zone_id": "russia_sakhalin_south"
}
Methodology: 2026.01.18

Recent Position Data

Time (UTC) Lat Lon Speed Course Zone
Oct 28 04:35 46.6241 142.7691 0.0 kn 35.6° Prigorodnoye/Sakhalin LNG
Oct 28 04:29 46.6241 142.7691 0.1 kn 35.6° Prigorodnoye/Sakhalin LNG
Oct 28 04:08 46.6240 142.7691 0.1 kn 119.7° Prigorodnoye/Sakhalin LNG
Oct 28 04:02 46.6241 142.7691 0.0 kn 349.0° Prigorodnoye/Sakhalin LNG
Oct 28 02:26 46.6241 142.7691 0.1 kn 0.0° Prigorodnoye/Sakhalin LNG
Oct 28 02:17 46.6241 142.7691 0.0 kn 0.0° Prigorodnoye/Sakhalin LNG
Oct 28 02:08 46.6241 142.7691 0.0 kn 0.0° Prigorodnoye/Sakhalin LNG
Oct 28 01:59 46.6241 142.7691 0.0 kn 0.0° Prigorodnoye/Sakhalin LNG
Oct 28 01:56 46.6241 142.7691 0.1 kn 0.0° Prigorodnoye/Sakhalin LNG
Oct 28 01:50 46.6241 142.7691 0.0 kn 0.0° Prigorodnoye/Sakhalin LNG
Oct 28 01:41 46.6241 142.7691 0.0 kn 0.0° Prigorodnoye/Sakhalin LNG
Oct 28 01:38 46.6241 142.7691 0.0 kn 0.0° Prigorodnoye/Sakhalin LNG
Oct 28 01:23 46.6241 142.7691 0.0 kn 0.0° Prigorodnoye/Sakhalin LNG
Oct 28 01:11 46.6241 142.7691 0.0 kn 0.0° Prigorodnoye/Sakhalin LNG
Oct 28 00:56 46.6241 142.7691 0.0 kn 0.0° Prigorodnoye/Sakhalin LNG
Oct 28 00:50 46.6241 142.7691 0.0 kn 0.0° Prigorodnoye/Sakhalin LNG
Oct 27 23:02 46.6241 142.7691 0.0 kn 0.0° Prigorodnoye/Sakhalin LNG
Oct 27 22:26 46.6241 142.7691 0.0 kn 0.0° Prigorodnoye/Sakhalin LNG
Oct 27 22:17 46.6241 142.7691 0.0 kn 0.0° Prigorodnoye/Sakhalin LNG
Oct 27 22:05 46.6241 142.7691 0.0 kn 0.0° Prigorodnoye/Sakhalin LNG

Showing 20 of 100 recent positions.

Data Source

Vessel observed through FleetLeaks' AIS monitoring system in zones of interest. Identity and position data derived from AIS broadcasts and public maritime databases.

Disclaimer: AIS data can be spoofed or falsified. Vessel identities should be independently verified before making compliance decisions.