OMSK

IMO 9418509

Vessel information

Vessel Name OMSK
IMO Number 9418509
MMSI 273371330
Vessel Type Tanker
Flag 🇷🇺 Russia
Call Sign UBZU
Length 100 m
Beam 16 m

Sanction Status

⚠️ This vessel is sanctioned.

View Full Sanctions Details →

Detected Events (100)

Zone Dwell Prigorodnoye/Sakhalin LNG
Jun 19, 2026 06:01 UTC 80.0% ▼
  • Zone: Prigorodnoye/Sakhalin LNG
  • Duration: 1h 35m
  • Data Points: 33 AIS positions
  • Period: 2026-06-19T06:01:03+00:00 to 2026-06-19T07:36:33+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "dwell_minutes": 95.5,
    "points_in_zone": 33,
    "first_point": {
        "ts": "2026-06-19T06:01:03+00:00",
        "lat": 46.430246699999997872509993612766265869140625,
        "lon": 142.945481699999987768023856915533542633056640625
    },
    "last_point": {
        "ts": "2026-06-19T07:36:33+00:00",
        "lat": 46.221558299999998098428477533161640167236328125,
        "lon": 143.177154999999999063220457173883914947509765625
    }
}
Methodology: 2026.01.18
Zone Dwell Sakhalin South Approach
Jun 19, 2026 06:01 UTC 80.0% ▼
  • Zone: Sakhalin South Approach
  • Duration: 1h 35m
  • Data Points: 33 AIS positions
  • Period: 2026-06-19T06:01:03+00:00 to 2026-06-19T07:36:33+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "dwell_minutes": 95.5,
    "points_in_zone": 33,
    "first_point": {
        "ts": "2026-06-19T06:01:03+00:00",
        "lat": 46.430246699999997872509993612766265869140625,
        "lon": 142.945481699999987768023856915533542633056640625
    },
    "last_point": {
        "ts": "2026-06-19T07:36:33+00:00",
        "lat": 46.221558299999998098428477533161640167236328125,
        "lon": 143.177154999999999063220457173883914947509765625
    }
}
Methodology: 2026.01.18
Zone Dwell Sakhalin South Approach
Jun 19, 2026 05:00 UTC 80.0% ▼
  • Zone: Sakhalin South Approach
  • Duration: 2h 36m
  • Data Points: 61 AIS positions
  • Period: 2026-06-19T05:00:33+00:00 to 2026-06-19T07:36:33+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "dwell_minutes": 156,
    "points_in_zone": 61,
    "first_point": {
        "ts": "2026-06-19T05:00:33+00:00",
        "lat": 46.51596669999999988931449479423463344573974609375,
        "lon": 142.733710000000002082742867060005664825439453125
    },
    "last_point": {
        "ts": "2026-06-19T07:36:33+00:00",
        "lat": 46.221558299999998098428477533161640167236328125,
        "lon": 143.177154999999999063220457173883914947509765625
    }
}
Methodology: 2026.01.18
Zone Dwell Prigorodnoye/Sakhalin LNG
Jun 19, 2026 05:00 UTC 80.0% ▼
  • Zone: Prigorodnoye/Sakhalin LNG
  • Duration: 2h 36m
  • Data Points: 61 AIS positions
  • Period: 2026-06-19T05:00:33+00:00 to 2026-06-19T07:36:33+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "dwell_minutes": 156,
    "points_in_zone": 61,
    "first_point": {
        "ts": "2026-06-19T05:00:33+00:00",
        "lat": 46.51596669999999988931449479423463344573974609375,
        "lon": 142.733710000000002082742867060005664825439453125
    },
    "last_point": {
        "ts": "2026-06-19T07:36:33+00:00",
        "lat": 46.221558299999998098428477533161640167236328125,
        "lon": 143.177154999999999063220457173883914947509765625
    }
}
Methodology: 2026.01.18
Zone Dwell Prigorodnoye/Sakhalin LNG
Jun 19, 2026 04:01 UTC 80.0% ▼
  • Zone: Prigorodnoye/Sakhalin LNG
  • Duration: 3h 35m
  • Data Points: 86 AIS positions
  • Period: 2026-06-19T04:01:33+00:00 to 2026-06-19T07:36:33+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "dwell_minutes": 215,
    "points_in_zone": 86,
    "first_point": {
        "ts": "2026-06-19T04:01:33+00:00",
        "lat": 46.663735000000002628439688123762607574462890625,
        "lon": 142.658015000000006011759978719055652618408203125
    },
    "last_point": {
        "ts": "2026-06-19T07:36:33+00:00",
        "lat": 46.221558299999998098428477533161640167236328125,
        "lon": 143.177154999999999063220457173883914947509765625
    }
}
Methodology: 2026.01.18
Zone Dwell Sakhalin South Approach
Jun 19, 2026 04:01 UTC 80.0% ▼
  • Zone: Sakhalin South Approach
  • Duration: 3h 35m
  • Data Points: 86 AIS positions
  • Period: 2026-06-19T04:01:33+00:00 to 2026-06-19T07:36:33+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "dwell_minutes": 215,
    "points_in_zone": 86,
    "first_point": {
        "ts": "2026-06-19T04:01:33+00:00",
        "lat": 46.663735000000002628439688123762607574462890625,
        "lon": 142.658015000000006011759978719055652618408203125
    },
    "last_point": {
        "ts": "2026-06-19T07:36:33+00:00",
        "lat": 46.221558299999998098428477533161640167236328125,
        "lon": 143.177154999999999063220457173883914947509765625
    }
}
Methodology: 2026.01.18
Zone Dwell Prigorodnoye/Sakhalin LNG
Jun 19, 2026 03:05 UTC 80.0% ▼
  • Zone: Prigorodnoye/Sakhalin LNG
  • Duration: 4h 31m
  • Data Points: 98 AIS positions
  • Period: 2026-06-19T03:05:29+00:00 to 2026-06-19T07:36:33+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "dwell_minutes": 271.1000000000000227373675443232059478759765625,
    "points_in_zone": 98,
    "first_point": {
        "ts": "2026-06-19T03:05:29+00:00",
        "lat": 46.6623349999999987858245731331408023834228515625,
        "lon": 142.6607549999999946521711535751819610595703125
    },
    "last_point": {
        "ts": "2026-06-19T07:36:33+00:00",
        "lat": 46.221558299999998098428477533161640167236328125,
        "lon": 143.177154999999999063220457173883914947509765625
    }
}
Methodology: 2026.01.18
Zone Dwell Sakhalin South Approach
Jun 19, 2026 03:05 UTC 80.0% ▼
  • Zone: Sakhalin South Approach
  • Duration: 4h 31m
  • Data Points: 98 AIS positions
  • Period: 2026-06-19T03:05:29+00:00 to 2026-06-19T07:36:33+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "dwell_minutes": 271.1000000000000227373675443232059478759765625,
    "points_in_zone": 98,
    "first_point": {
        "ts": "2026-06-19T03:05:29+00:00",
        "lat": 46.6623349999999987858245731331408023834228515625,
        "lon": 142.6607549999999946521711535751819610595703125
    },
    "last_point": {
        "ts": "2026-06-19T07:36:33+00:00",
        "lat": 46.221558299999998098428477533161640167236328125,
        "lon": 143.177154999999999063220457173883914947509765625
    }
}
Methodology: 2026.01.18
Sts🛰️✗ Prigorodnoye/Sakhalin LNG
Jun 19, 2026 03:01 UTC 69/100 ▼
Vessel A: PROXIMA (PROXIMA) RUSSIA
Vessel B: Omsk (OMSK) Russia
  • Minimum Distance: 23 meters
  • Average Distance: 95 meters
  • Duration: 1 hours
  • Period: 2026-06-19T03:01:44+00:00 to 2026-06-19T04:01:46+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.5 knots
  • Zone: Prigorodnoye/Sakhalin LNG

Confidence Analysis

Score: 69/100

Moderate-confidence STS candidate. Two tankers (PROXIMA and OMSK) maintained close proximity (min 23m, avg 95m) for 60 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.5 knots). Event occurred in Prigorodnoye/Sakhalin LNG, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness25/25Min distance 23m, avg 95m
Duration15/25Duration 60 minutes
Speed Stability14/20both nearly stationary; somewhat variable speeds
Distance Consistency5/15Distance variance ±142m
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: 2026-06-19T09:30:01.558940+00:00

Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273264690,
        "imo": 9329655,
        "name": "PROXIMA",
        "flag": "RUSSIA"
    },
    "vessel_b": {
        "mmsi": 273371330,
        "imo": 9418509,
        "name": "OMSK",
        "flag": "Russia"
    },
    "min_distance_m": 22.699999999999999289457264239899814128875732421875,
    "avg_distance_m": 94.900000000000005684341886080801486968994140625,
    "distance_consistency_m": 142.400000000000005684341886080801486968994140625,
    "duration_minutes": 60,
    "overlap_duration_s": 3602,
    "speed_a_avg": 0.040000000000000000832667268468867405317723751068115234375,
    "speed_a_std": 0.08000000000000000166533453693773481063544750213623046875,
    "speed_b_avg": 0.4699999999999999733546474089962430298328399658203125,
    "speed_b_std": 0.7399999999999999911182158029987476766109466552734375,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.040000000000000000832667268468867405317723751068115234375,
            "max_sog": 0.200000000000000011102230246251565404236316680908203125
        },
        "vessel_b": {
            "avg_sog": 0.4699999999999999733546474089962430298328399658203125,
            "max_sog": 1.899999999999999911182158029987476766109466552734375
        }
    },
    "time_window": {
        "start": "2026-06-19T03:01:44+00:00",
        "end": "2026-06-19T04:01:46+00:00"
    },
    "points_count": {
        "vessel_a": 11,
        "vessel_b": 11
    },
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "score": {
        "value": 69,
        "components": {
            "distance_tightness": {
                "score": 25,
                "max": 25,
                "detail": "Min distance 23m, avg 95m"
            },
            "duration": {
                "score": 15,
                "max": 25,
                "detail": "Duration 60 minutes"
            },
            "speed_stability": {
                "score": 14,
                "max": 20,
                "detail": "both nearly stationary; somewhat variable speeds"
            },
            "distance_consistency": {
                "score": 5,
                "max": 15,
                "detail": "Distance variance \u00b1142m"
            },
            "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 (PROXIMA and OMSK) maintained close proximity (min 23m, avg 95m) for 60 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.5 knots). Event occurred in Prigorodnoye\/Sakhalin LNG, a known STS activity area."
    },
    "sar": {
        "status": "not_found",
        "centroid": {
            "lat": 46.66265609999999952606231090612709522247314453125,
            "lon": 142.66118199999999660576577298343181610107421875
        },
        "time_window": {
            "start_ts": "2026-06-19T03:01:44+00:00",
            "end_ts": "2026-06-19T04:01:46+00:00"
        },
        "searched_at": "2026-06-19T09:30:01.558940+00:00",
        "notes": "No Sentinel-1 scenes covering AOI and time window"
    }
}
Methodology: 2026.01.18
Sts🛰️✗ Sakhalin South Approach
Jun 19, 2026 03:01 UTC 69/100 ▼
Vessel A: PROXIMA (PROXIMA) RUSSIA
Vessel B: Omsk (OMSK) Russia
  • Minimum Distance: 23 meters
  • Average Distance: 95 meters
  • Duration: 1 hours
  • Period: 2026-06-19T03:01:44+00:00 to 2026-06-19T04:01:46+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.5 knots
  • Zone: Sakhalin South Approach

Confidence Analysis

Score: 69/100

Moderate-confidence STS candidate. Two tankers (PROXIMA and OMSK) maintained close proximity (min 23m, avg 95m) for 60 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.5 knots). Event occurred in Sakhalin South Approach, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness25/25Min distance 23m, avg 95m
Duration15/25Duration 60 minutes
Speed Stability14/20both nearly stationary; somewhat variable speeds
Distance Consistency5/15Distance variance ±142m
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: 2026-06-19T09:30:04.061651+00:00

Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273264690,
        "imo": 9329655,
        "name": "PROXIMA",
        "flag": "RUSSIA"
    },
    "vessel_b": {
        "mmsi": 273371330,
        "imo": 9418509,
        "name": "OMSK",
        "flag": "Russia"
    },
    "min_distance_m": 22.699999999999999289457264239899814128875732421875,
    "avg_distance_m": 94.900000000000005684341886080801486968994140625,
    "distance_consistency_m": 142.400000000000005684341886080801486968994140625,
    "duration_minutes": 60,
    "overlap_duration_s": 3602,
    "speed_a_avg": 0.040000000000000000832667268468867405317723751068115234375,
    "speed_a_std": 0.08000000000000000166533453693773481063544750213623046875,
    "speed_b_avg": 0.4699999999999999733546474089962430298328399658203125,
    "speed_b_std": 0.7399999999999999911182158029987476766109466552734375,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.040000000000000000832667268468867405317723751068115234375,
            "max_sog": 0.200000000000000011102230246251565404236316680908203125
        },
        "vessel_b": {
            "avg_sog": 0.4699999999999999733546474089962430298328399658203125,
            "max_sog": 1.899999999999999911182158029987476766109466552734375
        }
    },
    "time_window": {
        "start": "2026-06-19T03:01:44+00:00",
        "end": "2026-06-19T04:01:46+00:00"
    },
    "points_count": {
        "vessel_a": 11,
        "vessel_b": 11
    },
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "score": {
        "value": 69,
        "components": {
            "distance_tightness": {
                "score": 25,
                "max": 25,
                "detail": "Min distance 23m, avg 95m"
            },
            "duration": {
                "score": 15,
                "max": 25,
                "detail": "Duration 60 minutes"
            },
            "speed_stability": {
                "score": 14,
                "max": 20,
                "detail": "both nearly stationary; somewhat variable speeds"
            },
            "distance_consistency": {
                "score": 5,
                "max": 15,
                "detail": "Distance variance \u00b1142m"
            },
            "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 (PROXIMA and OMSK) maintained close proximity (min 23m, avg 95m) for 60 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.5 knots). Event occurred in Sakhalin South Approach, a known STS activity area."
    },
    "sar": {
        "status": "not_found",
        "centroid": {
            "lat": 46.66265609999999952606231090612709522247314453125,
            "lon": 142.66118199999999660576577298343181610107421875
        },
        "time_window": {
            "start_ts": "2026-06-19T03:01:44+00:00",
            "end_ts": "2026-06-19T04:01:46+00:00"
        },
        "searched_at": "2026-06-19T09:30:04.061651+00:00",
        "notes": "No Sentinel-1 scenes covering AOI and time window"
    }
}
Methodology: 2026.01.18
Sts🛰️✗ Prigorodnoye/Sakhalin LNG
Jun 19, 2026 02:02 UTC 74/100 ▼
Vessel A: PROXIMA (PROXIMA) RUSSIA
Vessel B: Omsk (OMSK) Russia
  • Minimum Distance: 16 meters
  • Average Distance: 63 meters
  • Duration: 1h 57m
  • Period: 2026-06-19T02:04:44+00:00 to 2026-06-19T04:01:46+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.3 knots
  • Zone: Prigorodnoye/Sakhalin LNG

Confidence Analysis

Score: 74/100

Moderate-confidence STS candidate. Two tankers (PROXIMA and OMSK) maintained close proximity (min 16m, avg 63m) for 117 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.3 knots). Event occurred in Prigorodnoye/Sakhalin LNG, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness25/25Min distance 16m, avg 63m
Duration20/25Duration 117 minutes
Speed Stability14/20both nearly stationary; somewhat variable speeds
Distance Consistency5/15Distance variance ±110m
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: 2026-06-19T08:45:01.910533+00:00

Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273264690,
        "imo": 9329655,
        "name": "PROXIMA",
        "flag": "RUSSIA"
    },
    "vessel_b": {
        "mmsi": 273371330,
        "imo": 9418509,
        "name": "OMSK",
        "flag": "Russia"
    },
    "min_distance_m": 15.5999999999999996447286321199499070644378662109375,
    "avg_distance_m": 62.60000000000000142108547152020037174224853515625,
    "distance_consistency_m": 109.7000000000000028421709430404007434844970703125,
    "duration_minutes": 117,
    "overlap_duration_s": 7022,
    "speed_a_avg": 0.0200000000000000004163336342344337026588618755340576171875,
    "speed_a_std": 0.059999999999999997779553950749686919152736663818359375,
    "speed_b_avg": 0.2600000000000000088817841970012523233890533447265625,
    "speed_b_std": 0.58999999999999996891375531049561686813831329345703125,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.0200000000000000004163336342344337026588618755340576171875,
            "max_sog": 0.200000000000000011102230246251565404236316680908203125
        },
        "vessel_b": {
            "avg_sog": 0.2600000000000000088817841970012523233890533447265625,
            "max_sog": 1.899999999999999911182158029987476766109466552734375
        }
    },
    "time_window": {
        "start": "2026-06-19T02:04:44+00:00",
        "end": "2026-06-19T04:01:46+00:00"
    },
    "points_count": {
        "vessel_a": 20,
        "vessel_b": 20
    },
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "score": {
        "value": 74,
        "components": {
            "distance_tightness": {
                "score": 25,
                "max": 25,
                "detail": "Min distance 16m, avg 63m"
            },
            "duration": {
                "score": 20,
                "max": 25,
                "detail": "Duration 117 minutes"
            },
            "speed_stability": {
                "score": 14,
                "max": 20,
                "detail": "both nearly stationary; somewhat variable speeds"
            },
            "distance_consistency": {
                "score": 5,
                "max": 15,
                "detail": "Distance variance \u00b1110m"
            },
            "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 (PROXIMA and OMSK) maintained close proximity (min 16m, avg 63m) for 117 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.3 knots). Event occurred in Prigorodnoye\/Sakhalin LNG, a known STS activity area."
    },
    "sar": {
        "status": "not_found",
        "centroid": {
            "lat": 46.66256220000000354275471181608736515045166015625,
            "lon": 142.661101999999999634383129887282848358154296875
        },
        "time_window": {
            "start_ts": "2026-06-19T02:02:28+00:00",
            "end_ts": "2026-06-19T04:01:46+00:00"
        },
        "searched_at": "2026-06-19T08:45:01.910533+00:00",
        "notes": "No Sentinel-1 scenes covering AOI and time window"
    }
}
Methodology: 2026.01.18
Sts🛰️✗ Sakhalin South Approach
Jun 19, 2026 02:02 UTC 74/100 ▼
Vessel A: PROXIMA (PROXIMA) RUSSIA
Vessel B: Omsk (OMSK) Russia
  • Minimum Distance: 16 meters
  • Average Distance: 63 meters
  • Duration: 1h 57m
  • Period: 2026-06-19T02:04:44+00:00 to 2026-06-19T04:01:46+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.3 knots
  • Zone: Sakhalin South Approach

Confidence Analysis

Score: 74/100

Moderate-confidence STS candidate. Two tankers (PROXIMA and OMSK) maintained close proximity (min 16m, avg 63m) for 117 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.3 knots). Event occurred in Sakhalin South Approach, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness25/25Min distance 16m, avg 63m
Duration20/25Duration 117 minutes
Speed Stability14/20both nearly stationary; somewhat variable speeds
Distance Consistency5/15Distance variance ±110m
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: 2026-06-19T08:45:04.360624+00:00

Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273264690,
        "imo": 9329655,
        "name": "PROXIMA",
        "flag": "RUSSIA"
    },
    "vessel_b": {
        "mmsi": 273371330,
        "imo": 9418509,
        "name": "OMSK",
        "flag": "Russia"
    },
    "min_distance_m": 15.5999999999999996447286321199499070644378662109375,
    "avg_distance_m": 62.60000000000000142108547152020037174224853515625,
    "distance_consistency_m": 109.7000000000000028421709430404007434844970703125,
    "duration_minutes": 117,
    "overlap_duration_s": 7022,
    "speed_a_avg": 0.0200000000000000004163336342344337026588618755340576171875,
    "speed_a_std": 0.059999999999999997779553950749686919152736663818359375,
    "speed_b_avg": 0.2600000000000000088817841970012523233890533447265625,
    "speed_b_std": 0.58999999999999996891375531049561686813831329345703125,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.0200000000000000004163336342344337026588618755340576171875,
            "max_sog": 0.200000000000000011102230246251565404236316680908203125
        },
        "vessel_b": {
            "avg_sog": 0.2600000000000000088817841970012523233890533447265625,
            "max_sog": 1.899999999999999911182158029987476766109466552734375
        }
    },
    "time_window": {
        "start": "2026-06-19T02:04:44+00:00",
        "end": "2026-06-19T04:01:46+00:00"
    },
    "points_count": {
        "vessel_a": 20,
        "vessel_b": 20
    },
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "score": {
        "value": 74,
        "components": {
            "distance_tightness": {
                "score": 25,
                "max": 25,
                "detail": "Min distance 16m, avg 63m"
            },
            "duration": {
                "score": 20,
                "max": 25,
                "detail": "Duration 117 minutes"
            },
            "speed_stability": {
                "score": 14,
                "max": 20,
                "detail": "both nearly stationary; somewhat variable speeds"
            },
            "distance_consistency": {
                "score": 5,
                "max": 15,
                "detail": "Distance variance \u00b1110m"
            },
            "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 (PROXIMA and OMSK) maintained close proximity (min 16m, avg 63m) for 117 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.3 knots). Event occurred in Sakhalin South Approach, a known STS activity area."
    },
    "sar": {
        "status": "not_found",
        "centroid": {
            "lat": 46.66256220000000354275471181608736515045166015625,
            "lon": 142.661101999999999634383129887282848358154296875
        },
        "time_window": {
            "start_ts": "2026-06-19T02:02:28+00:00",
            "end_ts": "2026-06-19T04:01:46+00:00"
        },
        "searched_at": "2026-06-19T08:45:04.360624+00:00",
        "notes": "No Sentinel-1 scenes covering AOI and time window"
    }
}
Methodology: 2026.01.18
Zone Dwell Prigorodnoye/Sakhalin LNG
Jun 19, 2026 02:02 UTC 80.0% ▼
  • Zone: Prigorodnoye/Sakhalin LNG
  • Duration: 5h 34m
  • Data Points: 105 AIS positions
  • Period: 2026-06-19T02:02:28+00:00 to 2026-06-19T07:36:33+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "dwell_minutes": 334.1000000000000227373675443232059478759765625,
    "points_in_zone": 105,
    "first_point": {
        "ts": "2026-06-19T02:02:28+00:00",
        "lat": 46.66235830000000106565494206734001636505126953125,
        "lon": 142.660743300000007138805813156068325042724609375
    },
    "last_point": {
        "ts": "2026-06-19T07:36:33+00:00",
        "lat": 46.221558299999998098428477533161640167236328125,
        "lon": 143.177154999999999063220457173883914947509765625
    }
}
Methodology: 2026.01.18
Zone Dwell Sakhalin South Approach
Jun 19, 2026 02:02 UTC 80.0% ▼
  • Zone: Sakhalin South Approach
  • Duration: 5h 34m
  • Data Points: 105 AIS positions
  • Period: 2026-06-19T02:02:28+00:00 to 2026-06-19T07:36:33+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "dwell_minutes": 334.1000000000000227373675443232059478759765625,
    "points_in_zone": 105,
    "first_point": {
        "ts": "2026-06-19T02:02:28+00:00",
        "lat": 46.66235830000000106565494206734001636505126953125,
        "lon": 142.660743300000007138805813156068325042724609375
    },
    "last_point": {
        "ts": "2026-06-19T07:36:33+00:00",
        "lat": 46.221558299999998098428477533161640167236328125,
        "lon": 143.177154999999999063220457173883914947509765625
    }
}
Methodology: 2026.01.18
Loiter Prigorodnoye/Sakhalin LNG
Jun 19, 2026 02:02 UTC 75.0% ▼
  • Duration: 2h 4m
  • Radius: 907 meters
  • Data Points: 23 AIS positions
  • Centroid: 46.6624, 142.6605
  • Zone: Prigorodnoye/Sakhalin LNG
Show Raw Evidence JSON
{
    "radius_m": 907.3999999999999772626324556767940521240234375,
    "duration_minutes": 124.599999999999994315658113919198513031005859375,
    "points": 23,
    "centroid": {
        "lat": 46.66238239565217327253776602447032928466796875,
        "lon": 142.66047493478259866606094874441623687744140625
    },
    "bbox": {
        "min_lat": 46.65455670000000054642441682517528533935546875,
        "min_lon": 142.6571016999999983454472385346889495849609375,
        "max_lat": 46.6665832999999992125594872049987316131591796875,
        "max_lon": 142.663061699999985876274877227842807769775390625
    },
    "zone_id": "russia_prigorodnoye"
}
Methodology: 2026.01.18
Loiter Sakhalin South Approach
Jun 19, 2026 02:02 UTC 75.0% ▼
  • Duration: 2h 4m
  • Radius: 907 meters
  • Data Points: 23 AIS positions
  • Centroid: 46.6624, 142.6605
  • Zone: Sakhalin South Approach
Show Raw Evidence JSON
{
    "radius_m": 907.3999999999999772626324556767940521240234375,
    "duration_minutes": 124.599999999999994315658113919198513031005859375,
    "points": 23,
    "centroid": {
        "lat": 46.66238239565217327253776602447032928466796875,
        "lon": 142.66047493478259866606094874441623687744140625
    },
    "bbox": {
        "min_lat": 46.65455670000000054642441682517528533935546875,
        "min_lon": 142.6571016999999983454472385346889495849609375,
        "max_lat": 46.6665832999999992125594872049987316131591796875,
        "max_lon": 142.663061699999985876274877227842807769775390625
    },
    "zone_id": "russia_sakhalin_south"
}
Methodology: 2026.01.18
Zone Dwell Sakhalin South Approach
Jun 19, 2026 01:08 UTC 80.0% ▼
  • Zone: Sakhalin South Approach
  • Duration: 6h 28m
  • Data Points: 111 AIS positions
  • Period: 2026-06-19T01:08:28+00:00 to 2026-06-19T07:36:33+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "dwell_minutes": 388.1000000000000227373675443232059478759765625,
    "points_in_zone": 111,
    "first_point": {
        "ts": "2026-06-19T01:08:28+00:00",
        "lat": 46.66217499999999773763192933984100818634033203125,
        "lon": 142.6612082999999984167516231536865234375
    },
    "last_point": {
        "ts": "2026-06-19T07:36:33+00:00",
        "lat": 46.221558299999998098428477533161640167236328125,
        "lon": 143.177154999999999063220457173883914947509765625
    }
}
Methodology: 2026.01.18
Zone Dwell Prigorodnoye/Sakhalin LNG
Jun 19, 2026 01:08 UTC 80.0% ▼
  • Zone: Prigorodnoye/Sakhalin LNG
  • Duration: 6h 28m
  • Data Points: 111 AIS positions
  • Period: 2026-06-19T01:08:28+00:00 to 2026-06-19T07:36:33+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "dwell_minutes": 388.1000000000000227373675443232059478759765625,
    "points_in_zone": 111,
    "first_point": {
        "ts": "2026-06-19T01:08:28+00:00",
        "lat": 46.66217499999999773763192933984100818634033203125,
        "lon": 142.6612082999999984167516231536865234375
    },
    "last_point": {
        "ts": "2026-06-19T07:36:33+00:00",
        "lat": 46.221558299999998098428477533161640167236328125,
        "lon": 143.177154999999999063220457173883914947509765625
    }
}
Methodology: 2026.01.18
Loiter Prigorodnoye/Sakhalin LNG
Jun 19, 2026 01:08 UTC 75.0% ▼
  • Duration: 2h 58m
  • Radius: 907 meters
  • Data Points: 29 AIS positions
  • Centroid: 46.6624, 142.6606
  • Zone: Prigorodnoye/Sakhalin LNG
Show Raw Evidence JSON
{
    "radius_m": 906.700000000000045474735088646411895751953125,
    "duration_minutes": 178.599999999999994315658113919198513031005859375,
    "points": 29,
    "centroid": {
        "lat": 46.6623561551724179707889561541378498077392578125,
        "lon": 142.660568796551700643249205313622951507568359375
    },
    "bbox": {
        "min_lat": 46.65455670000000054642441682517528533935546875,
        "min_lon": 142.6571016999999983454472385346889495849609375,
        "max_lat": 46.6665832999999992125594872049987316131591796875,
        "max_lon": 142.663061699999985876274877227842807769775390625
    },
    "zone_id": "russia_prigorodnoye"
}
Methodology: 2026.01.18
Loiter Sakhalin South Approach
Jun 19, 2026 01:08 UTC 75.0% ▼
  • Duration: 2h 58m
  • Radius: 907 meters
  • Data Points: 29 AIS positions
  • Centroid: 46.6624, 142.6606
  • Zone: Sakhalin South Approach
Show Raw Evidence JSON
{
    "radius_m": 906.700000000000045474735088646411895751953125,
    "duration_minutes": 178.599999999999994315658113919198513031005859375,
    "points": 29,
    "centroid": {
        "lat": 46.6623561551724179707889561541378498077392578125,
        "lon": 142.660568796551700643249205313622951507568359375
    },
    "bbox": {
        "min_lat": 46.65455670000000054642441682517528533935546875,
        "min_lon": 142.6571016999999983454472385346889495849609375,
        "max_lat": 46.6665832999999992125594872049987316131591796875,
        "max_lon": 142.663061699999985876274877227842807769775390625
    },
    "zone_id": "russia_sakhalin_south"
}
Methodology: 2026.01.18
Sts Prigorodnoye/Sakhalin LNG
Jun 19, 2026 01:01 UTC 82/100 ▼
Vessel A: PROXIMA (PROXIMA) RUSSIA
Vessel B: Omsk (OMSK) Russia
  • Minimum Distance: 16 meters
  • Average Distance: 53 meters
  • Duration: 3 hours
  • Period: 2026-06-19T01:01:46+00:00 to 2026-06-19T04:01:46+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.2 knots
  • Zone: Prigorodnoye/Sakhalin LNG

Confidence Analysis

Score: 82/100

High-confidence STS candidate. Two tankers (PROXIMA and OMSK) maintained close proximity (min 16m, avg 53m) for 180 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.2 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 16m, avg 53m
Duration25/25Duration 180 minutes
Speed Stability14/20both nearly stationary; somewhat variable speeds
Distance Consistency8/15Distance variance ±95m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Prigorodnoye/Sakhalin LNG
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273264690,
        "imo": 9329655,
        "name": "PROXIMA",
        "flag": "RUSSIA"
    },
    "vessel_b": {
        "mmsi": 273371330,
        "imo": 9418509,
        "name": "OMSK",
        "flag": "Russia"
    },
    "min_distance_m": 15.5999999999999996447286321199499070644378662109375,
    "avg_distance_m": 52.89999999999999857891452847979962825775146484375,
    "distance_consistency_m": 95.2000000000000028421709430404007434844970703125,
    "duration_minutes": 180,
    "overlap_duration_s": 10800,
    "speed_a_avg": 0.01000000000000000020816681711721685132943093776702880859375,
    "speed_a_std": 0.05000000000000000277555756156289135105907917022705078125,
    "speed_b_avg": 0.190000000000000002220446049250313080847263336181640625,
    "speed_b_std": 0.520000000000000017763568394002504646778106689453125,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.01000000000000000020816681711721685132943093776702880859375,
            "max_sog": 0.200000000000000011102230246251565404236316680908203125
        },
        "vessel_b": {
            "avg_sog": 0.190000000000000002220446049250313080847263336181640625,
            "max_sog": 1.899999999999999911182158029987476766109466552734375
        }
    },
    "time_window": {
        "start": "2026-06-19T01:01:46+00:00",
        "end": "2026-06-19T04:01:46+00:00"
    },
    "points_count": {
        "vessel_a": 27,
        "vessel_b": 27
    },
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "score": {
        "value": 82,
        "components": {
            "distance_tightness": {
                "score": 25,
                "max": 25,
                "detail": "Min distance 16m, avg 53m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 180 minutes"
            },
            "speed_stability": {
                "score": 14,
                "max": 20,
                "detail": "both nearly stationary; somewhat variable speeds"
            },
            "distance_consistency": {
                "score": 8,
                "max": 15,
                "detail": "Distance variance \u00b195m"
            },
            "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 (PROXIMA and OMSK) maintained close proximity (min 16m, avg 53m) for 180 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.2 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
Jun 19, 2026 01:01 UTC 82/100 ▼
Vessel A: PROXIMA (PROXIMA) RUSSIA
Vessel B: Omsk (OMSK) Russia
  • Minimum Distance: 16 meters
  • Average Distance: 53 meters
  • Duration: 3 hours
  • Period: 2026-06-19T01:01:46+00:00 to 2026-06-19T04:01:46+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.2 knots
  • Zone: Sakhalin South Approach

Confidence Analysis

Score: 82/100

High-confidence STS candidate. Two tankers (PROXIMA and OMSK) maintained close proximity (min 16m, avg 53m) for 180 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.2 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 16m, avg 53m
Duration25/25Duration 180 minutes
Speed Stability14/20both nearly stationary; somewhat variable speeds
Distance Consistency8/15Distance variance ±95m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Sakhalin South Approach
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273264690,
        "imo": 9329655,
        "name": "PROXIMA",
        "flag": "RUSSIA"
    },
    "vessel_b": {
        "mmsi": 273371330,
        "imo": 9418509,
        "name": "OMSK",
        "flag": "Russia"
    },
    "min_distance_m": 15.5999999999999996447286321199499070644378662109375,
    "avg_distance_m": 52.89999999999999857891452847979962825775146484375,
    "distance_consistency_m": 95.2000000000000028421709430404007434844970703125,
    "duration_minutes": 180,
    "overlap_duration_s": 10800,
    "speed_a_avg": 0.01000000000000000020816681711721685132943093776702880859375,
    "speed_a_std": 0.05000000000000000277555756156289135105907917022705078125,
    "speed_b_avg": 0.190000000000000002220446049250313080847263336181640625,
    "speed_b_std": 0.520000000000000017763568394002504646778106689453125,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.01000000000000000020816681711721685132943093776702880859375,
            "max_sog": 0.200000000000000011102230246251565404236316680908203125
        },
        "vessel_b": {
            "avg_sog": 0.190000000000000002220446049250313080847263336181640625,
            "max_sog": 1.899999999999999911182158029987476766109466552734375
        }
    },
    "time_window": {
        "start": "2026-06-19T01:01:46+00:00",
        "end": "2026-06-19T04:01:46+00:00"
    },
    "points_count": {
        "vessel_a": 27,
        "vessel_b": 27
    },
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "score": {
        "value": 82,
        "components": {
            "distance_tightness": {
                "score": 25,
                "max": 25,
                "detail": "Min distance 16m, avg 53m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 180 minutes"
            },
            "speed_stability": {
                "score": 14,
                "max": 20,
                "detail": "both nearly stationary; somewhat variable speeds"
            },
            "distance_consistency": {
                "score": 8,
                "max": 15,
                "detail": "Distance variance \u00b195m"
            },
            "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 (PROXIMA and OMSK) maintained close proximity (min 16m, avg 53m) for 180 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.2 knots). Moderate distance variation observed during the encounter. Event occurred in Sakhalin South Approach, a known STS activity area."
    }
}
Methodology: 2026.01.18
Sts🛰️✗ Prigorodnoye/Sakhalin LNG
Jun 19, 2026 00:08 UTC 79/100 ▼
Vessel A: Omsk (OMSK) Russia
Vessel B: PROXIMA (PROXIMA) RUSSIA
  • Minimum Distance: 22 meters
  • Average Distance: 70 meters
  • Duration: 3h 48m
  • Period: 2026-06-19T00:08:27+00:00 to 2026-06-19T03:57:22+00:00
  • Vessel A Avg Speed: 0.3 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Prigorodnoye/Sakhalin LNG

Confidence Analysis

Score: 79/100

Moderate-confidence STS candidate. Two tankers (OMSK and PROXIMA) maintained close proximity (min 22m, avg 70m) for 229 minutes. Both vessels were slow-moving (avg speeds 0.2 and 0.0 knots). Event occurred in Prigorodnoye/Sakhalin LNG, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness25/25Min distance 22m, avg 70m
Duration25/25Duration 229 minutes
Speed Stability14/20both nearly stationary; somewhat variable speeds
Distance Consistency5/15Distance variance ±119m
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: 2026-06-19T05:00:07.641693+00:00

Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273371330,
        "imo": 9418509,
        "name": "OMSK",
        "flag": "Russia"
    },
    "vessel_b": {
        "mmsi": 273264690,
        "imo": 9329655,
        "name": "PROXIMA",
        "flag": "RUSSIA"
    },
    "min_distance_m": 21.800000000000000710542735760100185871124267578125,
    "avg_distance_m": 70.2999999999999971578290569595992565155029296875,
    "distance_consistency_m": 119.2000000000000028421709430404007434844970703125,
    "duration_minutes": 228.900000000000005684341886080801486968994140625,
    "overlap_duration_s": 13735,
    "speed_a_avg": 0.25,
    "speed_a_std": 0.60999999999999998667732370449812151491641998291015625,
    "speed_b_avg": 0.0200000000000000004163336342344337026588618755340576171875,
    "speed_b_std": 0.059999999999999997779553950749686919152736663818359375,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.25,
            "max_sog": 1.899999999999999911182158029987476766109466552734375
        },
        "vessel_b": {
            "avg_sog": 0.0200000000000000004163336342344337026588618755340576171875,
            "max_sog": 0.200000000000000011102230246251565404236316680908203125
        }
    },
    "time_window": {
        "start": "2026-06-19T00:08:27+00:00",
        "end": "2026-06-19T03:57:22+00:00"
    },
    "points_count": {
        "vessel_a": 25,
        "vessel_b": 25
    },
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "score": {
        "value": 79,
        "components": {
            "distance_tightness": {
                "score": 25,
                "max": 25,
                "detail": "Min distance 22m, avg 70m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 229 minutes"
            },
            "speed_stability": {
                "score": 14,
                "max": 20,
                "detail": "both nearly stationary; somewhat variable speeds"
            },
            "distance_consistency": {
                "score": 5,
                "max": 15,
                "detail": "Distance variance \u00b1119m"
            },
            "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 (OMSK and PROXIMA) maintained close proximity (min 22m, avg 70m) for 229 minutes. Both vessels were slow-moving (avg speeds 0.2 and 0.0 knots). Event occurred in Prigorodnoye\/Sakhalin LNG, a known STS activity area."
    },
    "sar": {
        "status": "not_found",
        "centroid": {
            "lat": 46.6624436999999971931174513883888721466064453125,
            "lon": 142.6610938000000032843672670423984527587890625
        },
        "time_window": {
            "start_ts": "2026-06-19T00:08:27+00:00",
            "end_ts": "2026-06-19T03:57:22+00:00"
        },
        "searched_at": "2026-06-19T05:00:07.641693+00:00",
        "notes": "No Sentinel-1 scenes covering AOI and time window"
    }
}
Methodology: 2026.01.18
Sts🛰️✗ Sakhalin South Approach
Jun 19, 2026 00:08 UTC 79/100 ▼
Vessel A: Omsk (OMSK) Russia
Vessel B: PROXIMA (PROXIMA) RUSSIA
  • Minimum Distance: 22 meters
  • Average Distance: 70 meters
  • Duration: 3h 48m
  • Period: 2026-06-19T00:08:27+00:00 to 2026-06-19T03:57:22+00:00
  • Vessel A Avg Speed: 0.3 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Sakhalin South Approach

Confidence Analysis

Score: 79/100

Moderate-confidence STS candidate. Two tankers (OMSK and PROXIMA) maintained close proximity (min 22m, avg 70m) for 229 minutes. Both vessels were slow-moving (avg speeds 0.2 and 0.0 knots). Event occurred in Sakhalin South Approach, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness25/25Min distance 22m, avg 70m
Duration25/25Duration 229 minutes
Speed Stability14/20both nearly stationary; somewhat variable speeds
Distance Consistency5/15Distance variance ±119m
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: 2026-06-19T05:00:10.027611+00:00

Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273371330,
        "imo": 9418509,
        "name": "OMSK",
        "flag": "Russia"
    },
    "vessel_b": {
        "mmsi": 273264690,
        "imo": 9329655,
        "name": "PROXIMA",
        "flag": "RUSSIA"
    },
    "min_distance_m": 21.800000000000000710542735760100185871124267578125,
    "avg_distance_m": 70.2999999999999971578290569595992565155029296875,
    "distance_consistency_m": 119.2000000000000028421709430404007434844970703125,
    "duration_minutes": 228.900000000000005684341886080801486968994140625,
    "overlap_duration_s": 13735,
    "speed_a_avg": 0.25,
    "speed_a_std": 0.60999999999999998667732370449812151491641998291015625,
    "speed_b_avg": 0.0200000000000000004163336342344337026588618755340576171875,
    "speed_b_std": 0.059999999999999997779553950749686919152736663818359375,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.25,
            "max_sog": 1.899999999999999911182158029987476766109466552734375
        },
        "vessel_b": {
            "avg_sog": 0.0200000000000000004163336342344337026588618755340576171875,
            "max_sog": 0.200000000000000011102230246251565404236316680908203125
        }
    },
    "time_window": {
        "start": "2026-06-19T00:08:27+00:00",
        "end": "2026-06-19T03:57:22+00:00"
    },
    "points_count": {
        "vessel_a": 25,
        "vessel_b": 25
    },
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "score": {
        "value": 79,
        "components": {
            "distance_tightness": {
                "score": 25,
                "max": 25,
                "detail": "Min distance 22m, avg 70m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 229 minutes"
            },
            "speed_stability": {
                "score": 14,
                "max": 20,
                "detail": "both nearly stationary; somewhat variable speeds"
            },
            "distance_consistency": {
                "score": 5,
                "max": 15,
                "detail": "Distance variance \u00b1119m"
            },
            "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 (OMSK and PROXIMA) maintained close proximity (min 22m, avg 70m) for 229 minutes. Both vessels were slow-moving (avg speeds 0.2 and 0.0 knots). Event occurred in Sakhalin South Approach, a known STS activity area."
    },
    "sar": {
        "status": "not_found",
        "centroid": {
            "lat": 46.6624436999999971931174513883888721466064453125,
            "lon": 142.6610938000000032843672670423984527587890625
        },
        "time_window": {
            "start_ts": "2026-06-19T00:08:27+00:00",
            "end_ts": "2026-06-19T03:57:22+00:00"
        },
        "searched_at": "2026-06-19T05:00:10.027611+00:00",
        "notes": "No Sentinel-1 scenes covering AOI and time window"
    }
}
Methodology: 2026.01.18
Zone Dwell Prigorodnoye/Sakhalin LNG
Jun 19, 2026 00:08 UTC 80.0% ▼
  • Zone: Prigorodnoye/Sakhalin LNG
  • Duration: 6h 29m
  • Data Points: 95 AIS positions
  • Period: 2026-06-19T00:08:27+00:00 to 2026-06-19T06:38:04+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "dwell_minutes": 389.6000000000000227373675443232059478759765625,
    "points_in_zone": 95,
    "first_point": {
        "ts": "2026-06-19T00:08:27+00:00",
        "lat": 46.662131700000003320383257232606410980224609375,
        "lon": 142.661480000000011614247341640293598175048828125
    },
    "last_point": {
        "ts": "2026-06-19T06:38:04+00:00",
        "lat": 46.38770000000000237605490838177502155303955078125,
        "lon": 143.07263499999999112333171069622039794921875
    }
}
Methodology: 2026.01.18
Zone Dwell Sakhalin South Approach
Jun 19, 2026 00:08 UTC 80.0% ▼
  • Zone: Sakhalin South Approach
  • Duration: 6h 29m
  • Data Points: 95 AIS positions
  • Period: 2026-06-19T00:08:27+00:00 to 2026-06-19T06:38:04+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "dwell_minutes": 389.6000000000000227373675443232059478759765625,
    "points_in_zone": 95,
    "first_point": {
        "ts": "2026-06-19T00:08:27+00:00",
        "lat": 46.662131700000003320383257232606410980224609375,
        "lon": 142.661480000000011614247341640293598175048828125
    },
    "last_point": {
        "ts": "2026-06-19T06:38:04+00:00",
        "lat": 46.38770000000000237605490838177502155303955078125,
        "lon": 143.07263499999999112333171069622039794921875
    }
}
Methodology: 2026.01.18
Loiter Prigorodnoye/Sakhalin LNG
Jun 19, 2026 00:08 UTC 75.0% ▼
  • Duration: 3h 58m
  • Radius: 907 meters
  • Data Points: 30 AIS positions
  • Centroid: 46.6623, 142.6606
  • Zone: Prigorodnoye/Sakhalin LNG
Show Raw Evidence JSON
{
    "radius_m": 906.6000000000000227373675443232059478759765625,
    "duration_minutes": 238.599999999999994315658113919198513031005859375,
    "points": 30,
    "centroid": {
        "lat": 46.6623486733333407983081997372210025787353515625,
        "lon": 142.6605991699999549382482655346393585205078125
    },
    "bbox": {
        "min_lat": 46.65455670000000054642441682517528533935546875,
        "min_lon": 142.6571016999999983454472385346889495849609375,
        "max_lat": 46.6665832999999992125594872049987316131591796875,
        "max_lon": 142.663061699999985876274877227842807769775390625
    },
    "zone_id": "russia_prigorodnoye"
}
Methodology: 2026.01.18
Loiter Sakhalin South Approach
Jun 19, 2026 00:08 UTC 75.0% ▼
  • Duration: 3h 58m
  • Radius: 907 meters
  • Data Points: 30 AIS positions
  • Centroid: 46.6623, 142.6606
  • Zone: Sakhalin South Approach
Show Raw Evidence JSON
{
    "radius_m": 906.6000000000000227373675443232059478759765625,
    "duration_minutes": 238.599999999999994315658113919198513031005859375,
    "points": 30,
    "centroid": {
        "lat": 46.6623486733333407983081997372210025787353515625,
        "lon": 142.6605991699999549382482655346393585205078125
    },
    "bbox": {
        "min_lat": 46.65455670000000054642441682517528533935546875,
        "min_lon": 142.6571016999999983454472385346889495849609375,
        "max_lat": 46.6665832999999992125594872049987316131591796875,
        "max_lon": 142.663061699999985876274877227842807769775390625
    },
    "zone_id": "russia_sakhalin_south"
}
Methodology: 2026.01.18
Sts Prigorodnoye/Sakhalin LNG
Jun 18, 2026 22:56 UTC 95/100 ▼
Vessel A: Omsk (OMSK) Russia
Vessel B: PROXIMA (PROXIMA) RUSSIA
  • Minimum Distance: 22 meters
  • Average Distance: 28 meters
  • Duration: 4h 50m
  • Period: 2026-06-18T22:56:26+00:00 to 2026-06-19T03:47:21+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 (OMSK and PROXIMA) maintained close proximity (min 22m, avg 28m) for 291 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 22m, avg 28m
Duration25/25Duration 291 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±7m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Prigorodnoye/Sakhalin LNG
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273371330,
        "imo": 9418509,
        "name": "OMSK",
        "flag": "Russia"
    },
    "vessel_b": {
        "mmsi": 273264690,
        "imo": 9329655,
        "name": "PROXIMA",
        "flag": "RUSSIA"
    },
    "min_distance_m": 21.800000000000000710542735760100185871124267578125,
    "avg_distance_m": 28.199999999999999289457264239899814128875732421875,
    "distance_consistency_m": 6.5999999999999996447286321199499070644378662109375,
    "duration_minutes": 290.8999999999999772626324556767940521240234375,
    "overlap_duration_s": 17455,
    "speed_a_avg": 0.0299999999999999988897769753748434595763683319091796875,
    "speed_a_std": 0.13000000000000000444089209850062616169452667236328125,
    "speed_b_avg": 0.0200000000000000004163336342344337026588618755340576171875,
    "speed_b_std": 0.059999999999999997779553950749686919152736663818359375,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.0299999999999999988897769753748434595763683319091796875,
            "max_sog": 0.59999999999999997779553950749686919152736663818359375
        },
        "vessel_b": {
            "avg_sog": 0.0200000000000000004163336342344337026588618755340576171875,
            "max_sog": 0.200000000000000011102230246251565404236316680908203125
        }
    },
    "time_window": {
        "start": "2026-06-18T22:56:26+00:00",
        "end": "2026-06-19T03:47:21+00:00"
    },
    "points_count": {
        "vessel_a": 23,
        "vessel_b": 23
    },
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "score": {
        "value": 95,
        "components": {
            "distance_tightness": {
                "score": 25,
                "max": 25,
                "detail": "Min distance 22m, avg 28m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 291 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b17m"
            },
            "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 (OMSK and PROXIMA) maintained close proximity (min 22m, avg 28m) for 291 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
Jun 18, 2026 22:56 UTC 95/100 ▼
Vessel A: Omsk (OMSK) Russia
Vessel B: PROXIMA (PROXIMA) RUSSIA
  • Minimum Distance: 22 meters
  • Average Distance: 28 meters
  • Duration: 4h 50m
  • Period: 2026-06-18T22:56:26+00:00 to 2026-06-19T03:47:21+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 (OMSK and PROXIMA) maintained close proximity (min 22m, avg 28m) for 291 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 22m, avg 28m
Duration25/25Duration 291 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±7m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Sakhalin South Approach
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273371330,
        "imo": 9418509,
        "name": "OMSK",
        "flag": "Russia"
    },
    "vessel_b": {
        "mmsi": 273264690,
        "imo": 9329655,
        "name": "PROXIMA",
        "flag": "RUSSIA"
    },
    "min_distance_m": 21.800000000000000710542735760100185871124267578125,
    "avg_distance_m": 28.199999999999999289457264239899814128875732421875,
    "distance_consistency_m": 6.5999999999999996447286321199499070644378662109375,
    "duration_minutes": 290.8999999999999772626324556767940521240234375,
    "overlap_duration_s": 17455,
    "speed_a_avg": 0.0299999999999999988897769753748434595763683319091796875,
    "speed_a_std": 0.13000000000000000444089209850062616169452667236328125,
    "speed_b_avg": 0.0200000000000000004163336342344337026588618755340576171875,
    "speed_b_std": 0.059999999999999997779553950749686919152736663818359375,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.0299999999999999988897769753748434595763683319091796875,
            "max_sog": 0.59999999999999997779553950749686919152736663818359375
        },
        "vessel_b": {
            "avg_sog": 0.0200000000000000004163336342344337026588618755340576171875,
            "max_sog": 0.200000000000000011102230246251565404236316680908203125
        }
    },
    "time_window": {
        "start": "2026-06-18T22:56:26+00:00",
        "end": "2026-06-19T03:47:21+00:00"
    },
    "points_count": {
        "vessel_a": 23,
        "vessel_b": 23
    },
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "score": {
        "value": 95,
        "components": {
            "distance_tightness": {
                "score": 25,
                "max": 25,
                "detail": "Min distance 22m, avg 28m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 291 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b17m"
            },
            "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 (OMSK and PROXIMA) maintained close proximity (min 22m, avg 28m) for 291 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
Jun 18, 2026 22:32 UTC 80.0% ▼
  • Zone: Prigorodnoye/Sakhalin LNG
  • Duration: 6h 30m
  • Data Points: 65 AIS positions
  • Period: 2026-06-18T22:56:26+00:00 to 2026-06-19T05:27:03+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "dwell_minutes": 390.6000000000000227373675443232059478759765625,
    "points_in_zone": 65,
    "first_point": {
        "ts": "2026-06-18T22:56:26+00:00",
        "lat": 46.66214169999999938909240881912410259246826171875,
        "lon": 142.66127000000000180079950951039791107177734375
    },
    "last_point": {
        "ts": "2026-06-19T05:27:03+00:00",
        "lat": 46.45163500000000311729309032671153545379638671875,
        "lon": 142.79935169999998834100551903247833251953125
    }
}
Methodology: 2026.01.18
Zone Dwell Sakhalin South Approach
Jun 18, 2026 22:32 UTC 80.0% ▼
  • Zone: Sakhalin South Approach
  • Duration: 6h 30m
  • Data Points: 65 AIS positions
  • Period: 2026-06-18T22:56:26+00:00 to 2026-06-19T05:27:03+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "dwell_minutes": 390.6000000000000227373675443232059478759765625,
    "points_in_zone": 65,
    "first_point": {
        "ts": "2026-06-18T22:56:26+00:00",
        "lat": 46.66214169999999938909240881912410259246826171875,
        "lon": 142.66127000000000180079950951039791107177734375
    },
    "last_point": {
        "ts": "2026-06-19T05:27:03+00:00",
        "lat": 46.45163500000000311729309032671153545379638671875,
        "lon": 142.79935169999998834100551903247833251953125
    }
}
Methodology: 2026.01.18
Loiter Prigorodnoye/Sakhalin LNG
Jun 18, 2026 22:32 UTC 75.0% ▼
  • Duration: 5h 34m
  • Radius: 906 meters
  • Data Points: 32 AIS positions
  • Centroid: 46.6623, 142.6606
  • Zone: Prigorodnoye/Sakhalin LNG
Show Raw Evidence JSON
{
    "radius_m": 906.200000000000045474735088646411895751953125,
    "duration_minutes": 334.6000000000000227373675443232059478759765625,
    "points": 32,
    "centroid": {
        "lat": 46.662335581250005134279490448534488677978515625,
        "lon": 142.660642346874993791061569936573505401611328125
    },
    "bbox": {
        "min_lat": 46.65455670000000054642441682517528533935546875,
        "min_lon": 142.6571016999999983454472385346889495849609375,
        "max_lat": 46.6665832999999992125594872049987316131591796875,
        "max_lon": 142.663061699999985876274877227842807769775390625
    },
    "zone_id": "russia_prigorodnoye"
}
Methodology: 2026.01.18
Loiter Sakhalin South Approach
Jun 18, 2026 22:32 UTC 75.0% ▼
  • Duration: 5h 34m
  • Radius: 906 meters
  • Data Points: 32 AIS positions
  • Centroid: 46.6623, 142.6606
  • Zone: Sakhalin South Approach
Show Raw Evidence JSON
{
    "radius_m": 906.200000000000045474735088646411895751953125,
    "duration_minutes": 334.6000000000000227373675443232059478759765625,
    "points": 32,
    "centroid": {
        "lat": 46.662335581250005134279490448534488677978515625,
        "lon": 142.660642346874993791061569936573505401611328125
    },
    "bbox": {
        "min_lat": 46.65455670000000054642441682517528533935546875,
        "min_lon": 142.6571016999999983454472385346889495849609375,
        "max_lat": 46.6665832999999992125594872049987316131591796875,
        "max_lon": 142.663061699999985876274877227842807769775390625
    },
    "zone_id": "russia_sakhalin_south"
}
Methodology: 2026.01.18
Zone Dwell Prigorodnoye/Sakhalin LNG
Jun 18, 2026 21:02 UTC 80.0% ▼
  • Zone: Prigorodnoye/Sakhalin LNG
  • Duration: 6h 29m
  • Data Points: 25 AIS positions
  • Period: 2026-06-18T21:17:26+00:00 to 2026-06-19T03:47:21+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "dwell_minutes": 389.8999999999999772626324556767940521240234375,
    "points_in_zone": 25,
    "first_point": {
        "ts": "2026-06-18T21:17:26+00:00",
        "lat": 46.66228670000000278150764643214643001556396484375,
        "lon": 142.660785000000004174580681137740612030029296875
    },
    "last_point": {
        "ts": "2026-06-19T03:47:21+00:00",
        "lat": 46.6629649999999998044586391188204288482666015625,
        "lon": 142.6612499999999954525264911353588104248046875
    }
}
Methodology: 2026.01.18
Zone Dwell Sakhalin South Approach
Jun 18, 2026 21:02 UTC 80.0% ▼
  • Zone: Sakhalin South Approach
  • Duration: 6h 29m
  • Data Points: 25 AIS positions
  • Period: 2026-06-18T21:17:26+00:00 to 2026-06-19T03:47:21+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "dwell_minutes": 389.8999999999999772626324556767940521240234375,
    "points_in_zone": 25,
    "first_point": {
        "ts": "2026-06-18T21:17:26+00:00",
        "lat": 46.66228670000000278150764643214643001556396484375,
        "lon": 142.660785000000004174580681137740612030029296875
    },
    "last_point": {
        "ts": "2026-06-19T03:47:21+00:00",
        "lat": 46.6629649999999998044586391188204288482666015625,
        "lon": 142.6612499999999954525264911353588104248046875
    }
}
Methodology: 2026.01.18
Loiter Prigorodnoye/Sakhalin LNG
Jun 18, 2026 21:02 UTC 75.0% ▼
  • Duration: 6h 29m
  • Radius: 77 meters
  • Data Points: 25 AIS positions
  • Centroid: 46.6623, 142.6609
  • Zone: Prigorodnoye/Sakhalin LNG
Show Raw Evidence JSON
{
    "radius_m": 76.5,
    "duration_minutes": 389.8999999999999772626324556767940521240234375,
    "points": 25,
    "centroid": {
        "lat": 46.6623103440000051023162086494266986846923828125,
        "lon": 142.6609436679999589614453725516796112060546875
    },
    "bbox": {
        "min_lat": 46.662131700000003320383257232606410980224609375,
        "min_lon": 142.660674999999997680788510479032993316650390625,
        "max_lat": 46.6629649999999998044586391188204288482666015625,
        "max_lon": 142.661480000000011614247341640293598175048828125
    },
    "zone_id": "russia_prigorodnoye"
}
Methodology: 2026.01.18
Loiter Sakhalin South Approach
Jun 18, 2026 21:02 UTC 75.0% ▼
  • Duration: 6h 29m
  • Radius: 77 meters
  • Data Points: 25 AIS positions
  • Centroid: 46.6623, 142.6609
  • Zone: Sakhalin South Approach
Show Raw Evidence JSON
{
    "radius_m": 76.5,
    "duration_minutes": 389.8999999999999772626324556767940521240234375,
    "points": 25,
    "centroid": {
        "lat": 46.6623103440000051023162086494266986846923828125,
        "lon": 142.6609436679999589614453725516796112060546875
    },
    "bbox": {
        "min_lat": 46.662131700000003320383257232606410980224609375,
        "min_lon": 142.660674999999997680788510479032993316650390625,
        "max_lat": 46.6629649999999998044586391188204288482666015625,
        "max_lon": 142.661480000000011614247341640293598175048828125
    },
    "zone_id": "russia_sakhalin_south"
}
Methodology: 2026.01.18
Zone Dwell Prigorodnoye/Sakhalin LNG
Jun 18, 2026 20:17 UTC 80.0% ▼
  • Zone: Prigorodnoye/Sakhalin LNG
  • Duration: 6h 36m
  • Data Points: 25 AIS positions
  • Period: 2026-06-18T20:50:26+00:00 to 2026-06-19T03:26:29+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "dwell_minutes": 396.1000000000000227373675443232059478759765625,
    "points_in_zone": 25,
    "first_point": {
        "ts": "2026-06-18T20:50:26+00:00",
        "lat": 46.6622966999999988502167980186641216278076171875,
        "lon": 142.6607549999999946521711535751819610595703125
    },
    "last_point": {
        "ts": "2026-06-19T03:26:29+00:00",
        "lat": 46.66225670000000036452547647058963775634765625,
        "lon": 142.660981700000007776907295919954776763916015625
    }
}
Methodology: 2026.01.18
Zone Dwell Sakhalin South Approach
Jun 18, 2026 20:17 UTC 80.0% ▼
  • Zone: Sakhalin South Approach
  • Duration: 6h 36m
  • Data Points: 25 AIS positions
  • Period: 2026-06-18T20:50:26+00:00 to 2026-06-19T03:26:29+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "dwell_minutes": 396.1000000000000227373675443232059478759765625,
    "points_in_zone": 25,
    "first_point": {
        "ts": "2026-06-18T20:50:26+00:00",
        "lat": 46.6622966999999988502167980186641216278076171875,
        "lon": 142.6607549999999946521711535751819610595703125
    },
    "last_point": {
        "ts": "2026-06-19T03:26:29+00:00",
        "lat": 46.66225670000000036452547647058963775634765625,
        "lon": 142.660981700000007776907295919954776763916015625
    }
}
Methodology: 2026.01.18
Loiter Prigorodnoye/Sakhalin LNG
Jun 18, 2026 20:17 UTC 75.0% ▼
  • Duration: 6h 36m
  • Radius: 48 meters
  • Data Points: 25 AIS positions
  • Centroid: 46.6623, 142.6609
  • Zone: Prigorodnoye/Sakhalin LNG
Show Raw Evidence JSON
{
    "radius_m": 48,
    "duration_minutes": 396.1000000000000227373675443232059478759765625,
    "points": 25,
    "centroid": {
        "lat": 46.66227874799999852939436095766723155975341796875,
        "lon": 142.660889999999966448740451596677303314208984375
    },
    "bbox": {
        "min_lat": 46.662131700000003320383257232606410980224609375,
        "min_lon": 142.66059500000000070940586738288402557373046875,
        "max_lat": 46.66235830000000106565494206734001636505126953125,
        "max_lon": 142.661480000000011614247341640293598175048828125
    },
    "zone_id": "russia_prigorodnoye"
}
Methodology: 2026.01.18
Loiter Sakhalin South Approach
Jun 18, 2026 20:17 UTC 75.0% ▼
  • Duration: 6h 36m
  • Radius: 48 meters
  • Data Points: 25 AIS positions
  • Centroid: 46.6623, 142.6609
  • Zone: Sakhalin South Approach
Show Raw Evidence JSON
{
    "radius_m": 48,
    "duration_minutes": 396.1000000000000227373675443232059478759765625,
    "points": 25,
    "centroid": {
        "lat": 46.66227874799999852939436095766723155975341796875,
        "lon": 142.660889999999966448740451596677303314208984375
    },
    "bbox": {
        "min_lat": 46.662131700000003320383257232606410980224609375,
        "min_lon": 142.66059500000000070940586738288402557373046875,
        "max_lat": 46.66235830000000106565494206734001636505126953125,
        "max_lon": 142.661480000000011614247341640293598175048828125
    },
    "zone_id": "russia_sakhalin_south"
}
Methodology: 2026.01.18
Sts Prigorodnoye/Sakhalin LNG
Jun 18, 2026 20:07 UTC 85/100 ▼
Vessel A: PROXIMA (PROXIMA) RUSSIA
Vessel B: Omsk (OMSK) Russia
  • Minimum Distance: 11 meters
  • Average Distance: 25 meters
  • Duration: 1h 15m
  • Period: 2026-06-18T20:07:45+00:00 to 2026-06-18T21:22:50+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 (PROXIMA and OMSK) maintained close proximity (min 11m, avg 25m) for 75 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 11m, avg 25m
Duration15/25Duration 75 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±5m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Prigorodnoye/Sakhalin LNG
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273264690,
        "imo": 9329655,
        "name": "PROXIMA",
        "flag": "RUSSIA"
    },
    "vessel_b": {
        "mmsi": 273371330,
        "imo": 9418509,
        "name": "OMSK",
        "flag": "Russia"
    },
    "min_distance_m": 11.4000000000000003552713678800500929355621337890625,
    "avg_distance_m": 25.10000000000000142108547152020037174224853515625,
    "distance_consistency_m": 5.29999999999999982236431605997495353221893310546875,
    "duration_minutes": 75.099999999999994315658113919198513031005859375,
    "overlap_duration_s": 4505,
    "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": "2026-06-18T20:07:45+00:00",
        "end": "2026-06-18T21:22:50+00:00"
    },
    "points_count": {
        "vessel_a": 14,
        "vessel_b": 14
    },
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "score": {
        "value": 85,
        "components": {
            "distance_tightness": {
                "score": 25,
                "max": 25,
                "detail": "Min distance 11m, avg 25m"
            },
            "duration": {
                "score": 15,
                "max": 25,
                "detail": "Duration 75 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b15m"
            },
            "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 (PROXIMA and OMSK) maintained close proximity (min 11m, avg 25m) for 75 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
Jun 18, 2026 20:07 UTC 85/100 ▼
Vessel A: PROXIMA (PROXIMA) RUSSIA
Vessel B: Omsk (OMSK) Russia
  • Minimum Distance: 11 meters
  • Average Distance: 25 meters
  • Duration: 1h 15m
  • Period: 2026-06-18T20:07:45+00:00 to 2026-06-18T21:22:50+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 (PROXIMA and OMSK) maintained close proximity (min 11m, avg 25m) for 75 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 11m, avg 25m
Duration15/25Duration 75 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±5m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Sakhalin South Approach
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273264690,
        "imo": 9329655,
        "name": "PROXIMA",
        "flag": "RUSSIA"
    },
    "vessel_b": {
        "mmsi": 273371330,
        "imo": 9418509,
        "name": "OMSK",
        "flag": "Russia"
    },
    "min_distance_m": 11.4000000000000003552713678800500929355621337890625,
    "avg_distance_m": 25.10000000000000142108547152020037174224853515625,
    "distance_consistency_m": 5.29999999999999982236431605997495353221893310546875,
    "duration_minutes": 75.099999999999994315658113919198513031005859375,
    "overlap_duration_s": 4505,
    "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": "2026-06-18T20:07:45+00:00",
        "end": "2026-06-18T21:22:50+00:00"
    },
    "points_count": {
        "vessel_a": 14,
        "vessel_b": 14
    },
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "score": {
        "value": 85,
        "components": {
            "distance_tightness": {
                "score": 25,
                "max": 25,
                "detail": "Min distance 11m, avg 25m"
            },
            "duration": {
                "score": 15,
                "max": 25,
                "detail": "Duration 75 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b15m"
            },
            "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 (PROXIMA and OMSK) maintained close proximity (min 11m, avg 25m) for 75 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
Jun 18, 2026 19:38 UTC 80.0% ▼
  • Zone: Sakhalin South Approach
  • Duration: 6h 30m
  • Data Points: 20 AIS positions
  • Period: 2026-06-18T19:38:25+00:00 to 2026-06-19T02:08:28+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "dwell_minutes": 390.1000000000000227373675443232059478759765625,
    "points_in_zone": 20,
    "first_point": {
        "ts": "2026-06-18T19:38:25+00:00",
        "lat": 46.66281169999999889341779635287821292877197265625,
        "lon": 142.66082000000000107320374809205532073974609375
    },
    "last_point": {
        "ts": "2026-06-19T02:08:28+00:00",
        "lat": 46.66233170000000285426722257398068904876708984375,
        "lon": 142.660751699999991615186445415019989013671875
    }
}
Methodology: 2026.01.18
Zone Dwell Prigorodnoye/Sakhalin LNG
Jun 18, 2026 19:38 UTC 80.0% ▼
  • Zone: Prigorodnoye/Sakhalin LNG
  • Duration: 6h 30m
  • Data Points: 20 AIS positions
  • Period: 2026-06-18T19:38:25+00:00 to 2026-06-19T02:08:28+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "dwell_minutes": 390.1000000000000227373675443232059478759765625,
    "points_in_zone": 20,
    "first_point": {
        "ts": "2026-06-18T19:38:25+00:00",
        "lat": 46.66281169999999889341779635287821292877197265625,
        "lon": 142.66082000000000107320374809205532073974609375
    },
    "last_point": {
        "ts": "2026-06-19T02:08:28+00:00",
        "lat": 46.66233170000000285426722257398068904876708984375,
        "lon": 142.660751699999991615186445415019989013671875
    }
}
Methodology: 2026.01.18
Loiter Prigorodnoye/Sakhalin LNG
Jun 18, 2026 19:38 UTC 75.0% ▼
  • Duration: 6h 30m
  • Radius: 59 meters
  • Data Points: 20 AIS positions
  • Centroid: 46.6623, 142.6609
  • Zone: Prigorodnoye/Sakhalin LNG
Show Raw Evidence JSON
{
    "radius_m": 58.7000000000000028421709430404007434844970703125,
    "duration_minutes": 390.1000000000000227373675443232059478759765625,
    "points": 20,
    "centroid": {
        "lat": 46.6622855199999975184255163185298442840576171875,
        "lon": 142.66088974500001995693310163915157318115234375
    },
    "bbox": {
        "min_lat": 46.662131700000003320383257232606410980224609375,
        "min_lon": 142.66059500000000070940586738288402557373046875,
        "max_lat": 46.66281169999999889341779635287821292877197265625,
        "max_lon": 142.661480000000011614247341640293598175048828125
    },
    "zone_id": "russia_prigorodnoye"
}
Methodology: 2026.01.18
Loiter Sakhalin South Approach
Jun 18, 2026 19:38 UTC 75.0% ▼
  • Duration: 6h 30m
  • Radius: 59 meters
  • Data Points: 20 AIS positions
  • Centroid: 46.6623, 142.6609
  • Zone: Sakhalin South Approach
Show Raw Evidence JSON
{
    "radius_m": 58.7000000000000028421709430404007434844970703125,
    "duration_minutes": 390.1000000000000227373675443232059478759765625,
    "points": 20,
    "centroid": {
        "lat": 46.6622855199999975184255163185298442840576171875,
        "lon": 142.66088974500001995693310163915157318115234375
    },
    "bbox": {
        "min_lat": 46.662131700000003320383257232606410980224609375,
        "min_lon": 142.66059500000000070940586738288402557373046875,
        "max_lat": 46.66281169999999889341779635287821292877197265625,
        "max_lon": 142.661480000000011614247341640293598175048828125
    },
    "zone_id": "russia_sakhalin_south"
}
Methodology: 2026.01.18
Zone Dwell Sakhalin South Approach
Jun 18, 2026 18:08 UTC 80.0% ▼
  • Zone: Sakhalin South Approach
  • Duration: 6 hours
  • Data Points: 13 AIS positions
  • Period: 2026-06-18T18:08:24+00:00 to 2026-06-19T00:08:27+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "dwell_minutes": 360.1000000000000227373675443232059478759765625,
    "points_in_zone": 13,
    "first_point": {
        "ts": "2026-06-18T18:08:24+00:00",
        "lat": 46.66312500000000085265128291212022304534912109375,
        "lon": 142.660343299999993860183167271316051483154296875
    },
    "last_point": {
        "ts": "2026-06-19T00:08:27+00:00",
        "lat": 46.662131700000003320383257232606410980224609375,
        "lon": 142.661480000000011614247341640293598175048828125
    }
}
Methodology: 2026.01.18
Zone Dwell Prigorodnoye/Sakhalin LNG
Jun 18, 2026 18:08 UTC 80.0% ▼
  • Zone: Prigorodnoye/Sakhalin LNG
  • Duration: 6 hours
  • Data Points: 13 AIS positions
  • Period: 2026-06-18T18:08:24+00:00 to 2026-06-19T00:08:27+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "dwell_minutes": 360.1000000000000227373675443232059478759765625,
    "points_in_zone": 13,
    "first_point": {
        "ts": "2026-06-18T18:08:24+00:00",
        "lat": 46.66312500000000085265128291212022304534912109375,
        "lon": 142.660343299999993860183167271316051483154296875
    },
    "last_point": {
        "ts": "2026-06-19T00:08:27+00:00",
        "lat": 46.662131700000003320383257232606410980224609375,
        "lon": 142.661480000000011614247341640293598175048828125
    }
}
Methodology: 2026.01.18
Loiter Prigorodnoye/Sakhalin LNG
Jun 18, 2026 18:08 UTC 75.0% ▼
  • Duration: 6 hours
  • Radius: 94 meters
  • Data Points: 13 AIS positions
  • Centroid: 46.6624, 142.6609
  • Zone: Prigorodnoye/Sakhalin LNG
Show Raw Evidence JSON
{
    "radius_m": 94,
    "duration_minutes": 360.1000000000000227373675443232059478759765625,
    "points": 13,
    "centroid": {
        "lat": 46.66235476923076674893309245817363262176513671875,
        "lon": 142.6608516615384587566950358450412750244140625
    },
    "bbox": {
        "min_lat": 46.662131700000003320383257232606410980224609375,
        "min_lon": 142.660343299999993860183167271316051483154296875,
        "max_lat": 46.66312500000000085265128291212022304534912109375,
        "max_lon": 142.661480000000011614247341640293598175048828125
    },
    "zone_id": "russia_prigorodnoye"
}
Methodology: 2026.01.18
Loiter Sakhalin South Approach
Jun 18, 2026 18:08 UTC 75.0% ▼
  • Duration: 6 hours
  • Radius: 94 meters
  • Data Points: 13 AIS positions
  • Centroid: 46.6624, 142.6609
  • Zone: Sakhalin South Approach
Show Raw Evidence JSON
{
    "radius_m": 94,
    "duration_minutes": 360.1000000000000227373675443232059478759765625,
    "points": 13,
    "centroid": {
        "lat": 46.66235476923076674893309245817363262176513671875,
        "lon": 142.6608516615384587566950358450412750244140625
    },
    "bbox": {
        "min_lat": 46.662131700000003320383257232606410980224609375,
        "min_lon": 142.660343299999993860183167271316051483154296875,
        "max_lat": 46.66312500000000085265128291212022304534912109375,
        "max_lon": 142.661480000000011614247341640293598175048828125
    },
    "zone_id": "russia_sakhalin_south"
}
Methodology: 2026.01.18
Sts🛰️✗ Prigorodnoye/Sakhalin LNG
Jun 18, 2026 17:02 UTC 95/100 ▼
Vessel A: Omsk (OMSK) Russia
Vessel B: PROXIMA (PROXIMA) RUSSIA
  • Minimum Distance: 23 meters
  • Average Distance: 26 meters
  • Duration: 4h 15m
  • Period: 2026-06-18T17:02:23+00:00 to 2026-06-18T21:17:26+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 (OMSK and PROXIMA) maintained close proximity (min 23m, avg 26m) for 255 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 23m, avg 26m
Duration25/25Duration 255 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: 2026-06-18T23:45:01.640819+00:00

Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273371330,
        "imo": 9418509,
        "name": "OMSK",
        "flag": "Russia"
    },
    "vessel_b": {
        "mmsi": 273264690,
        "imo": 9329655,
        "name": "PROXIMA",
        "flag": "RUSSIA"
    },
    "min_distance_m": 22.60000000000000142108547152020037174224853515625,
    "avg_distance_m": 25.5,
    "distance_consistency_m": 1.600000000000000088817841970012523233890533447265625,
    "duration_minutes": 255.099999999999994315658113919198513031005859375,
    "overlap_duration_s": 15303,
    "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": "2026-06-18T17:02:23+00:00",
        "end": "2026-06-18T21:17:26+00:00"
    },
    "points_count": {
        "vessel_a": 12,
        "vessel_b": 12
    },
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "score": {
        "value": 95,
        "components": {
            "distance_tightness": {
                "score": 25,
                "max": 25,
                "detail": "Min distance 23m, avg 26m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 255 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 (OMSK and PROXIMA) maintained close proximity (min 23m, avg 26m) for 255 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": 46.66244950000000102363628684543073177337646484375,
            "lon": 142.660637100000002419619704596698284149169921875
        },
        "time_window": {
            "start_ts": "2026-06-18T17:02:23+00:00",
            "end_ts": "2026-06-18T21:17:26+00:00"
        },
        "searched_at": "2026-06-18T23:45:01.640819+00:00",
        "notes": "No Sentinel-1 scenes covering AOI and time window"
    }
}
Methodology: 2026.01.18
Sts🛰️✗ Sakhalin South Approach
Jun 18, 2026 17:02 UTC 95/100 ▼
Vessel A: Omsk (OMSK) Russia
Vessel B: PROXIMA (PROXIMA) RUSSIA
  • Minimum Distance: 23 meters
  • Average Distance: 26 meters
  • Duration: 4h 15m
  • Period: 2026-06-18T17:02:23+00:00 to 2026-06-18T21:17:26+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 (OMSK and PROXIMA) maintained close proximity (min 23m, avg 26m) for 255 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 23m, avg 26m
Duration25/25Duration 255 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: 2026-06-18T23:45:04.129155+00:00

Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273371330,
        "imo": 9418509,
        "name": "OMSK",
        "flag": "Russia"
    },
    "vessel_b": {
        "mmsi": 273264690,
        "imo": 9329655,
        "name": "PROXIMA",
        "flag": "RUSSIA"
    },
    "min_distance_m": 22.60000000000000142108547152020037174224853515625,
    "avg_distance_m": 25.5,
    "distance_consistency_m": 1.600000000000000088817841970012523233890533447265625,
    "duration_minutes": 255.099999999999994315658113919198513031005859375,
    "overlap_duration_s": 15303,
    "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": "2026-06-18T17:02:23+00:00",
        "end": "2026-06-18T21:17:26+00:00"
    },
    "points_count": {
        "vessel_a": 12,
        "vessel_b": 12
    },
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "score": {
        "value": 95,
        "components": {
            "distance_tightness": {
                "score": 25,
                "max": 25,
                "detail": "Min distance 23m, avg 26m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 255 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 (OMSK and PROXIMA) maintained close proximity (min 23m, avg 26m) for 255 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": 46.66244950000000102363628684543073177337646484375,
            "lon": 142.660637100000002419619704596698284149169921875
        },
        "time_window": {
            "start_ts": "2026-06-18T17:02:23+00:00",
            "end_ts": "2026-06-18T21:17:26+00:00"
        },
        "searched_at": "2026-06-18T23:45:04.129155+00:00",
        "notes": "No Sentinel-1 scenes covering AOI and time window"
    }
}
Methodology: 2026.01.18
Zone Dwell Prigorodnoye/Sakhalin LNG
Jun 18, 2026 17:02 UTC 80.0% ▼
  • Zone: Prigorodnoye/Sakhalin LNG
  • Duration: 5h 54m
  • Data Points: 14 AIS positions
  • Period: 2026-06-18T17:02:23+00:00 to 2026-06-18T22:56:26+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "dwell_minutes": 354.1000000000000227373675443232059478759765625,
    "points_in_zone": 14,
    "first_point": {
        "ts": "2026-06-18T17:02:23+00:00",
        "lat": 46.6632900000000034879121812991797924041748046875,
        "lon": 142.6601617000000032930984161794185638427734375
    },
    "last_point": {
        "ts": "2026-06-18T22:56:26+00:00",
        "lat": 46.66214169999999938909240881912410259246826171875,
        "lon": 142.66127000000000180079950951039791107177734375
    }
}
Methodology: 2026.01.18
Zone Dwell Sakhalin South Approach
Jun 18, 2026 17:02 UTC 80.0% ▼
  • Zone: Sakhalin South Approach
  • Duration: 5h 54m
  • Data Points: 14 AIS positions
  • Period: 2026-06-18T17:02:23+00:00 to 2026-06-18T22:56:26+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "dwell_minutes": 354.1000000000000227373675443232059478759765625,
    "points_in_zone": 14,
    "first_point": {
        "ts": "2026-06-18T17:02:23+00:00",
        "lat": 46.6632900000000034879121812991797924041748046875,
        "lon": 142.6601617000000032930984161794185638427734375
    },
    "last_point": {
        "ts": "2026-06-18T22:56:26+00:00",
        "lat": 46.66214169999999938909240881912410259246826171875,
        "lon": 142.66127000000000180079950951039791107177734375
    }
}
Methodology: 2026.01.18
Loiter Prigorodnoye/Sakhalin LNG
Jun 18, 2026 17:02 UTC 75.0% ▼
  • Duration: 5h 54m
  • Radius: 97 meters
  • Data Points: 14 AIS positions
  • Centroid: 46.6625, 142.6607
  • Zone: Prigorodnoye/Sakhalin LNG
Show Raw Evidence JSON
{
    "radius_m": 97.400000000000005684341886080801486968994140625,
    "duration_minutes": 354.1000000000000227373675443232059478759765625,
    "points": 14,
    "centroid": {
        "lat": 46.66250061428571171973089803941547870635986328125,
        "lon": 142.66071464285715819642064161598682403564453125
    },
    "bbox": {
        "min_lat": 46.66213669999999780202415422536432743072509765625,
        "min_lon": 142.6601617000000032930984161794185638427734375,
        "max_lat": 46.6632900000000034879121812991797924041748046875,
        "max_lon": 142.661309999999986075636115856468677520751953125
    },
    "zone_id": "russia_prigorodnoye"
}
Methodology: 2026.01.18
Loiter Sakhalin South Approach
Jun 18, 2026 17:02 UTC 75.0% ▼
  • Duration: 5h 54m
  • Radius: 97 meters
  • Data Points: 14 AIS positions
  • Centroid: 46.6625, 142.6607
  • Zone: Sakhalin South Approach
Show Raw Evidence JSON
{
    "radius_m": 97.400000000000005684341886080801486968994140625,
    "duration_minutes": 354.1000000000000227373675443232059478759765625,
    "points": 14,
    "centroid": {
        "lat": 46.66250061428571171973089803941547870635986328125,
        "lon": 142.66071464285715819642064161598682403564453125
    },
    "bbox": {
        "min_lat": 46.66213669999999780202415422536432743072509765625,
        "min_lon": 142.6601617000000032930984161794185638427734375,
        "max_lat": 46.6632900000000034879121812991797924041748046875,
        "max_lon": 142.661309999999986075636115856468677520751953125
    },
    "zone_id": "russia_sakhalin_south"
}
Methodology: 2026.01.18
Sts Prigorodnoye/Sakhalin LNG
Jun 18, 2026 16:37 UTC 95/100 ▼
Vessel A: Omsk (OMSK) Russia
Vessel B: PROXIMA (PROXIMA) RUSSIA
  • Minimum Distance: 23 meters
  • Average Distance: 25 meters
  • Duration: 4h 54m
  • Period: 2026-06-18T16:23:23+00:00 to 2026-06-18T21:17:26+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 (OMSK and PROXIMA) maintained close proximity (min 23m, avg 25m) for 294 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 23m, avg 25m
Duration25/25Duration 294 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": 273371330,
        "imo": 9418509,
        "name": "OMSK",
        "flag": "Russia"
    },
    "vessel_b": {
        "mmsi": 273264690,
        "imo": 9329655,
        "name": "PROXIMA",
        "flag": "RUSSIA"
    },
    "min_distance_m": 22.60000000000000142108547152020037174224853515625,
    "avg_distance_m": 25.300000000000000710542735760100185871124267578125,
    "distance_consistency_m": 1.5,
    "duration_minutes": 294.1000000000000227373675443232059478759765625,
    "overlap_duration_s": 17643,
    "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": "2026-06-18T16:23:23+00:00",
        "end": "2026-06-18T21:17:26+00:00"
    },
    "points_count": {
        "vessel_a": 15,
        "vessel_b": 15
    },
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "score": {
        "value": 95,
        "components": {
            "distance_tightness": {
                "score": 25,
                "max": 25,
                "detail": "Min distance 23m, avg 25m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 294 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 (OMSK and PROXIMA) maintained close proximity (min 23m, avg 25m) for 294 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
Jun 18, 2026 16:37 UTC 95/100 ▼
Vessel A: Omsk (OMSK) Russia
Vessel B: PROXIMA (PROXIMA) RUSSIA
  • Minimum Distance: 23 meters
  • Average Distance: 25 meters
  • Duration: 4h 54m
  • Period: 2026-06-18T16:23:23+00:00 to 2026-06-18T21:17:26+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 (OMSK and PROXIMA) maintained close proximity (min 23m, avg 25m) for 294 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 23m, avg 25m
Duration25/25Duration 294 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": 273371330,
        "imo": 9418509,
        "name": "OMSK",
        "flag": "Russia"
    },
    "vessel_b": {
        "mmsi": 273264690,
        "imo": 9329655,
        "name": "PROXIMA",
        "flag": "RUSSIA"
    },
    "min_distance_m": 22.60000000000000142108547152020037174224853515625,
    "avg_distance_m": 25.300000000000000710542735760100185871124267578125,
    "distance_consistency_m": 1.5,
    "duration_minutes": 294.1000000000000227373675443232059478759765625,
    "overlap_duration_s": 17643,
    "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": "2026-06-18T16:23:23+00:00",
        "end": "2026-06-18T21:17:26+00:00"
    },
    "points_count": {
        "vessel_a": 15,
        "vessel_b": 15
    },
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "score": {
        "value": 95,
        "components": {
            "distance_tightness": {
                "score": 25,
                "max": 25,
                "detail": "Min distance 23m, avg 25m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 294 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 (OMSK and PROXIMA) maintained close proximity (min 23m, avg 25m) for 294 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
Jun 18, 2026 16:05 UTC 80.0% ▼
  • Zone: Sakhalin South Approach
  • Duration: 6h 33m
  • Data Points: 17 AIS positions
  • Period: 2026-06-18T16:23:23+00:00 to 2026-06-18T22:56:26+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "dwell_minutes": 393.1000000000000227373675443232059478759765625,
    "points_in_zone": 17,
    "first_point": {
        "ts": "2026-06-18T16:23:23+00:00",
        "lat": 46.6633767000000005964466254226863384246826171875,
        "lon": 142.66010829999999032224877737462520599365234375
    },
    "last_point": {
        "ts": "2026-06-18T22:56:26+00:00",
        "lat": 46.66214169999999938909240881912410259246826171875,
        "lon": 142.66127000000000180079950951039791107177734375
    }
}
Methodology: 2026.01.18
Zone Dwell Prigorodnoye/Sakhalin LNG
Jun 18, 2026 16:05 UTC 80.0% ▼
  • Zone: Prigorodnoye/Sakhalin LNG
  • Duration: 6h 33m
  • Data Points: 17 AIS positions
  • Period: 2026-06-18T16:23:23+00:00 to 2026-06-18T22:56:26+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "dwell_minutes": 393.1000000000000227373675443232059478759765625,
    "points_in_zone": 17,
    "first_point": {
        "ts": "2026-06-18T16:23:23+00:00",
        "lat": 46.6633767000000005964466254226863384246826171875,
        "lon": 142.66010829999999032224877737462520599365234375
    },
    "last_point": {
        "ts": "2026-06-18T22:56:26+00:00",
        "lat": 46.66214169999999938909240881912410259246826171875,
        "lon": 142.66127000000000180079950951039791107177734375
    }
}
Methodology: 2026.01.18
Loiter Prigorodnoye/Sakhalin LNG
Jun 18, 2026 16:05 UTC 75.0% ▼
  • Duration: 6h 33m
  • Radius: 90 meters
  • Data Points: 17 AIS positions
  • Centroid: 46.6626, 142.6606
  • Zone: Prigorodnoye/Sakhalin LNG
Show Raw Evidence JSON
{
    "radius_m": 89.599999999999994315658113919198513031005859375,
    "duration_minutes": 393.1000000000000227373675443232059478759765625,
    "points": 17,
    "centroid": {
        "lat": 46.6626494294117577510405681096017360687255859375,
        "lon": 142.660613817647089263118687085807323455810546875
    },
    "bbox": {
        "min_lat": 46.66213669999999780202415422536432743072509765625,
        "min_lon": 142.66010829999999032224877737462520599365234375,
        "max_lat": 46.6633767000000005964466254226863384246826171875,
        "max_lon": 142.661309999999986075636115856468677520751953125
    },
    "zone_id": "russia_prigorodnoye"
}
Methodology: 2026.01.18
Loiter Sakhalin South Approach
Jun 18, 2026 16:05 UTC 75.0% ▼
  • Duration: 6h 33m
  • Radius: 90 meters
  • Data Points: 17 AIS positions
  • Centroid: 46.6626, 142.6606
  • Zone: Sakhalin South Approach
Show Raw Evidence JSON
{
    "radius_m": 89.599999999999994315658113919198513031005859375,
    "duration_minutes": 393.1000000000000227373675443232059478759765625,
    "points": 17,
    "centroid": {
        "lat": 46.6626494294117577510405681096017360687255859375,
        "lon": 142.660613817647089263118687085807323455810546875
    },
    "bbox": {
        "min_lat": 46.66213669999999780202415422536432743072509765625,
        "min_lon": 142.66010829999999032224877737462520599365234375,
        "max_lat": 46.6633767000000005964466254226863384246826171875,
        "max_lon": 142.661309999999986075636115856468677520751953125
    },
    "zone_id": "russia_sakhalin_south"
}
Methodology: 2026.01.18
Sts Prigorodnoye/Sakhalin LNG
Jun 18, 2026 15:59 UTC 95/100 ▼
Vessel A: Omsk (OMSK) Russia
Vessel B: PROXIMA (PROXIMA) RUSSIA
  • Minimum Distance: 23 meters
  • Average Distance: 25 meters
  • Duration: 5h 3m
  • Period: 2026-06-18T15:59:23+00:00 to 2026-06-18T21:02:25+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 (OMSK and PROXIMA) maintained close proximity (min 23m, avg 25m) for 303 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 23m, avg 25m
Duration25/25Duration 303 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": 273371330,
        "imo": 9418509,
        "name": "OMSK",
        "flag": "Russia"
    },
    "vessel_b": {
        "mmsi": 273264690,
        "imo": 9329655,
        "name": "PROXIMA",
        "flag": "RUSSIA"
    },
    "min_distance_m": 22.60000000000000142108547152020037174224853515625,
    "avg_distance_m": 25.199999999999999289457264239899814128875732421875,
    "distance_consistency_m": 1.399999999999999911182158029987476766109466552734375,
    "duration_minutes": 303,
    "overlap_duration_s": 18182,
    "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": "2026-06-18T15:59:23+00:00",
        "end": "2026-06-18T21:02:25+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 23m, avg 25m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 303 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 (OMSK and PROXIMA) maintained close proximity (min 23m, avg 25m) for 303 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
Jun 18, 2026 15:59 UTC 95/100 ▼
Vessel A: Omsk (OMSK) Russia
Vessel B: PROXIMA (PROXIMA) RUSSIA
  • Minimum Distance: 23 meters
  • Average Distance: 25 meters
  • Duration: 5h 3m
  • Period: 2026-06-18T15:59:23+00:00 to 2026-06-18T21:02:25+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 (OMSK and PROXIMA) maintained close proximity (min 23m, avg 25m) for 303 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 23m, avg 25m
Duration25/25Duration 303 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": 273371330,
        "imo": 9418509,
        "name": "OMSK",
        "flag": "Russia"
    },
    "vessel_b": {
        "mmsi": 273264690,
        "imo": 9329655,
        "name": "PROXIMA",
        "flag": "RUSSIA"
    },
    "min_distance_m": 22.60000000000000142108547152020037174224853515625,
    "avg_distance_m": 25.199999999999999289457264239899814128875732421875,
    "distance_consistency_m": 1.399999999999999911182158029987476766109466552734375,
    "duration_minutes": 303,
    "overlap_duration_s": 18182,
    "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": "2026-06-18T15:59:23+00:00",
        "end": "2026-06-18T21:02:25+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 23m, avg 25m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 303 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 (OMSK and PROXIMA) maintained close proximity (min 23m, avg 25m) for 303 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
Jun 18, 2026 15:05 UTC 80.0% ▼
  • Zone: Sakhalin South Approach
  • Duration: 6h 12m
  • Data Points: 23 AIS positions
  • Period: 2026-06-18T15:05:22+00:00 to 2026-06-18T21:17:26+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "dwell_minutes": 372.1000000000000227373675443232059478759765625,
    "points_in_zone": 23,
    "first_point": {
        "ts": "2026-06-18T15:05:22+00:00",
        "lat": 46.6632383000000032780008041299879550933837890625,
        "lon": 142.66022670000000971413101069629192352294921875
    },
    "last_point": {
        "ts": "2026-06-18T21:17:26+00:00",
        "lat": 46.66228670000000278150764643214643001556396484375,
        "lon": 142.660785000000004174580681137740612030029296875
    }
}
Methodology: 2026.01.18
Zone Dwell Prigorodnoye/Sakhalin LNG
Jun 18, 2026 15:05 UTC 80.0% ▼
  • Zone: Prigorodnoye/Sakhalin LNG
  • Duration: 6h 12m
  • Data Points: 23 AIS positions
  • Period: 2026-06-18T15:05:22+00:00 to 2026-06-18T21:17:26+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "dwell_minutes": 372.1000000000000227373675443232059478759765625,
    "points_in_zone": 23,
    "first_point": {
        "ts": "2026-06-18T15:05:22+00:00",
        "lat": 46.6632383000000032780008041299879550933837890625,
        "lon": 142.66022670000000971413101069629192352294921875
    },
    "last_point": {
        "ts": "2026-06-18T21:17:26+00:00",
        "lat": 46.66228670000000278150764643214643001556396484375,
        "lon": 142.660785000000004174580681137740612030029296875
    }
}
Methodology: 2026.01.18
Loiter Prigorodnoye/Sakhalin LNG
Jun 18, 2026 15:05 UTC 75.0% ▼
  • Duration: 6h 12m
  • Radius: 80 meters
  • Data Points: 23 AIS positions
  • Centroid: 46.6629, 142.6604
  • Zone: Prigorodnoye/Sakhalin LNG
Show Raw Evidence JSON
{
    "radius_m": 80.400000000000005684341886080801486968994140625,
    "duration_minutes": 372.1000000000000227373675443232059478759765625,
    "points": 23,
    "centroid": {
        "lat": 46.662910082608703987716580741107463836669921875,
        "lon": 142.66041455652174363422091118991374969482421875
    },
    "bbox": {
        "min_lat": 46.66223670000000112167981569655239582061767578125,
        "min_lon": 142.66010829999999032224877737462520599365234375,
        "max_lat": 46.6633767000000005964466254226863384246826171875,
        "max_lon": 142.66082000000000107320374809205532073974609375
    },
    "zone_id": "russia_prigorodnoye"
}
Methodology: 2026.01.18
Loiter Sakhalin South Approach
Jun 18, 2026 15:05 UTC 75.0% ▼
  • Duration: 6h 12m
  • Radius: 80 meters
  • Data Points: 23 AIS positions
  • Centroid: 46.6629, 142.6604
  • Zone: Sakhalin South Approach
Show Raw Evidence JSON
{
    "radius_m": 80.400000000000005684341886080801486968994140625,
    "duration_minutes": 372.1000000000000227373675443232059478759765625,
    "points": 23,
    "centroid": {
        "lat": 46.662910082608703987716580741107463836669921875,
        "lon": 142.66041455652174363422091118991374969482421875
    },
    "bbox": {
        "min_lat": 46.66223670000000112167981569655239582061767578125,
        "min_lon": 142.66010829999999032224877737462520599365234375,
        "max_lat": 46.6633767000000005964466254226863384246826171875,
        "max_lon": 142.66082000000000107320374809205532073974609375
    },
    "zone_id": "russia_sakhalin_south"
}
Methodology: 2026.01.18
Loiter Prigorodnoye/Sakhalin LNG
Jun 18, 2026 14:11 UTC 75.0% ▼
  • Duration: 6h 33m
  • Radius: 85 meters
  • Data Points: 26 AIS positions
  • Centroid: 46.6630, 142.6605
  • Zone: Prigorodnoye/Sakhalin LNG
Show Raw Evidence JSON
{
    "radius_m": 85.2000000000000028421709430404007434844970703125,
    "duration_minutes": 393.69999999999998863131622783839702606201171875,
    "points": 26,
    "centroid": {
        "lat": 46.66296802307693525335707818157970905303955078125,
        "lon": 142.660466976923061110937851481139659881591796875
    },
    "bbox": {
        "min_lat": 46.66223670000000112167981569655239582061767578125,
        "min_lon": 142.66010829999999032224877737462520599365234375,
        "max_lat": 46.66344670000000149912011693231761455535888671875,
        "max_lon": 142.6610249999999950887286104261875152587890625
    },
    "zone_id": "russia_prigorodnoye"
}
Methodology: 2026.01.18
Loiter Sakhalin South Approach
Jun 18, 2026 14:11 UTC 75.0% ▼
  • Duration: 6h 33m
  • Radius: 85 meters
  • Data Points: 26 AIS positions
  • Centroid: 46.6630, 142.6605
  • Zone: Sakhalin South Approach
Show Raw Evidence JSON
{
    "radius_m": 85.2000000000000028421709430404007434844970703125,
    "duration_minutes": 393.69999999999998863131622783839702606201171875,
    "points": 26,
    "centroid": {
        "lat": 46.66296802307693525335707818157970905303955078125,
        "lon": 142.660466976923061110937851481139659881591796875
    },
    "bbox": {
        "min_lat": 46.66223670000000112167981569655239582061767578125,
        "min_lon": 142.66010829999999032224877737462520599365234375,
        "max_lat": 46.66344670000000149912011693231761455535888671875,
        "max_lon": 142.6610249999999950887286104261875152587890625
    },
    "zone_id": "russia_sakhalin_south"
}
Methodology: 2026.01.18
Sts Prigorodnoye/Sakhalin LNG
Jun 18, 2026 14:07 UTC 85/100 ▼
Vessel A: PROXIMA (PROXIMA) RUSSIA
Vessel B: Omsk (OMSK) Russia
  • Minimum Distance: 21 meters
  • Average Distance: 50 meters
  • Duration: 2h 21m
  • Period: 2026-06-18T14:07:42+00:00 to 2026-06-18T16:28:46+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.2 knots
  • Zone: Prigorodnoye/Sakhalin LNG

Confidence Analysis

Score: 85/100

High-confidence STS candidate. Two tankers (PROXIMA and OMSK) maintained close proximity (min 21m, avg 50m) for 141 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.2 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 21m, avg 50m
Duration25/25Duration 141 minutes
Speed Stability17/20both nearly stationary; stable speeds
Distance Consistency8/15Distance variance ±60m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Prigorodnoye/Sakhalin LNG
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273264690,
        "imo": 9329655,
        "name": "PROXIMA",
        "flag": "RUSSIA"
    },
    "vessel_b": {
        "mmsi": 273371330,
        "imo": 9418509,
        "name": "OMSK",
        "flag": "Russia"
    },
    "min_distance_m": 21,
    "avg_distance_m": 49.5,
    "distance_consistency_m": 59.60000000000000142108547152020037174224853515625,
    "duration_minutes": 141.099999999999994315658113919198513031005859375,
    "overlap_duration_s": 8464,
    "speed_a_avg": 0.040000000000000000832667268468867405317723751068115234375,
    "speed_a_std": 0.059999999999999997779553950749686919152736663818359375,
    "speed_b_avg": 0.2399999999999999911182158029987476766109466552734375,
    "speed_b_std": 0.5,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.040000000000000000832667268468867405317723751068115234375,
            "max_sog": 0.200000000000000011102230246251565404236316680908203125
        },
        "vessel_b": {
            "avg_sog": 0.2399999999999999911182158029987476766109466552734375,
            "max_sog": 1.5
        }
    },
    "time_window": {
        "start": "2026-06-18T14:07:42+00:00",
        "end": "2026-06-18T16:28:46+00:00"
    },
    "points_count": {
        "vessel_a": 16,
        "vessel_b": 16
    },
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "score": {
        "value": 85,
        "components": {
            "distance_tightness": {
                "score": 25,
                "max": 25,
                "detail": "Min distance 21m, avg 50m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 141 minutes"
            },
            "speed_stability": {
                "score": 17,
                "max": 20,
                "detail": "both nearly stationary; stable speeds"
            },
            "distance_consistency": {
                "score": 8,
                "max": 15,
                "detail": "Distance variance \u00b160m"
            },
            "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 (PROXIMA and OMSK) maintained close proximity (min 21m, avg 50m) for 141 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.2 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
Jun 18, 2026 14:07 UTC 85/100 ▼
Vessel A: PROXIMA (PROXIMA) RUSSIA
Vessel B: Omsk (OMSK) Russia
  • Minimum Distance: 21 meters
  • Average Distance: 50 meters
  • Duration: 2h 21m
  • Period: 2026-06-18T14:07:42+00:00 to 2026-06-18T16:28:46+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.2 knots
  • Zone: Sakhalin South Approach

Confidence Analysis

Score: 85/100

High-confidence STS candidate. Two tankers (PROXIMA and OMSK) maintained close proximity (min 21m, avg 50m) for 141 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.2 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 21m, avg 50m
Duration25/25Duration 141 minutes
Speed Stability17/20both nearly stationary; stable speeds
Distance Consistency8/15Distance variance ±60m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Sakhalin South Approach
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273264690,
        "imo": 9329655,
        "name": "PROXIMA",
        "flag": "RUSSIA"
    },
    "vessel_b": {
        "mmsi": 273371330,
        "imo": 9418509,
        "name": "OMSK",
        "flag": "Russia"
    },
    "min_distance_m": 21,
    "avg_distance_m": 49.5,
    "distance_consistency_m": 59.60000000000000142108547152020037174224853515625,
    "duration_minutes": 141.099999999999994315658113919198513031005859375,
    "overlap_duration_s": 8464,
    "speed_a_avg": 0.040000000000000000832667268468867405317723751068115234375,
    "speed_a_std": 0.059999999999999997779553950749686919152736663818359375,
    "speed_b_avg": 0.2399999999999999911182158029987476766109466552734375,
    "speed_b_std": 0.5,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.040000000000000000832667268468867405317723751068115234375,
            "max_sog": 0.200000000000000011102230246251565404236316680908203125
        },
        "vessel_b": {
            "avg_sog": 0.2399999999999999911182158029987476766109466552734375,
            "max_sog": 1.5
        }
    },
    "time_window": {
        "start": "2026-06-18T14:07:42+00:00",
        "end": "2026-06-18T16:28:46+00:00"
    },
    "points_count": {
        "vessel_a": 16,
        "vessel_b": 16
    },
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "score": {
        "value": 85,
        "components": {
            "distance_tightness": {
                "score": 25,
                "max": 25,
                "detail": "Min distance 21m, avg 50m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 141 minutes"
            },
            "speed_stability": {
                "score": 17,
                "max": 20,
                "detail": "both nearly stationary; stable speeds"
            },
            "distance_consistency": {
                "score": 8,
                "max": 15,
                "detail": "Distance variance \u00b160m"
            },
            "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 (PROXIMA and OMSK) maintained close proximity (min 21m, avg 50m) for 141 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.2 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 Sakhalin South Approach
Jun 18, 2026 14:01 UTC 80.0% ▼
  • Zone: Sakhalin South Approach
  • Duration: 6h 33m
  • Data Points: 26 AIS positions
  • Period: 2026-06-18T14:43:44+00:00 to 2026-06-18T21:17:26+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "dwell_minutes": 393.69999999999998863131622783839702606201171875,
    "points_in_zone": 26,
    "first_point": {
        "ts": "2026-06-18T14:43:44+00:00",
        "lat": 46.66344670000000149912011693231761455535888671875,
        "lon": 142.6610249999999950887286104261875152587890625
    },
    "last_point": {
        "ts": "2026-06-18T21:17:26+00:00",
        "lat": 46.66228670000000278150764643214643001556396484375,
        "lon": 142.660785000000004174580681137740612030029296875
    }
}
Methodology: 2026.01.18
Zone Dwell Prigorodnoye/Sakhalin LNG
Jun 18, 2026 14:01 UTC 80.0% ▼
  • Zone: Prigorodnoye/Sakhalin LNG
  • Duration: 6h 33m
  • Data Points: 26 AIS positions
  • Period: 2026-06-18T14:43:44+00:00 to 2026-06-18T21:17:26+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "dwell_minutes": 393.69999999999998863131622783839702606201171875,
    "points_in_zone": 26,
    "first_point": {
        "ts": "2026-06-18T14:43:44+00:00",
        "lat": 46.66344670000000149912011693231761455535888671875,
        "lon": 142.6610249999999950887286104261875152587890625
    },
    "last_point": {
        "ts": "2026-06-18T21:17:26+00:00",
        "lat": 46.66228670000000278150764643214643001556396484375,
        "lon": 142.660785000000004174580681137740612030029296875
    }
}
Methodology: 2026.01.18
Loiter Prigorodnoye/Sakhalin LNG
Jun 18, 2026 13:58 UTC 75.0% ▼
  • Duration: 6h 22m
  • Radius: 1,006 meters
  • Data Points: 32 AIS positions
  • Centroid: 46.6624, 142.6599
  • Zone: Prigorodnoye/Sakhalin LNG
Show Raw Evidence JSON
{
    "radius_m": 1005.6000000000000227373675443232059478759765625,
    "duration_minutes": 382,
    "points": 32,
    "centroid": {
        "lat": 46.6624426031250010282747098244726657867431640625,
        "lon": 142.6599158281250083746272139251232147216796875
    },
    "bbox": {
        "min_lat": 46.6543716999999986683178576640784740447998046875,
        "min_lon": 142.65398329999999305073288269340991973876953125,
        "max_lat": 46.66346329999999653637132723815739154815673828125,
        "max_lon": 142.6612867000000051120878197252750396728515625
    },
    "zone_id": "russia_prigorodnoye"
}
Methodology: 2026.01.18
Loiter Sakhalin South Approach
Jun 18, 2026 13:58 UTC 75.0% ▼
  • Duration: 6h 22m
  • Radius: 1,006 meters
  • Data Points: 32 AIS positions
  • Centroid: 46.6624, 142.6599
  • Zone: Sakhalin South Approach
Show Raw Evidence JSON
{
    "radius_m": 1005.6000000000000227373675443232059478759765625,
    "duration_minutes": 382,
    "points": 32,
    "centroid": {
        "lat": 46.6624426031250010282747098244726657867431640625,
        "lon": 142.6599158281250083746272139251232147216796875
    },
    "bbox": {
        "min_lat": 46.6543716999999986683178576640784740447998046875,
        "min_lon": 142.65398329999999305073288269340991973876953125,
        "max_lat": 46.66346329999999653637132723815739154815673828125,
        "max_lon": 142.6612867000000051120878197252750396728515625
    },
    "zone_id": "russia_sakhalin_south"
}
Methodology: 2026.01.18
Zone Dwell Prigorodnoye/Sakhalin LNG
Jun 18, 2026 13:01 UTC 80.0% ▼
  • Zone: Prigorodnoye/Sakhalin LNG
  • Duration: 6h 22m
  • Data Points: 32 AIS positions
  • Period: 2026-06-18T13:58:24+00:00 to 2026-06-18T20:20:25+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "dwell_minutes": 382,
    "points_in_zone": 32,
    "first_point": {
        "ts": "2026-06-18T13:58:24+00:00",
        "lat": 46.6543716999999986683178576640784740447998046875,
        "lon": 142.65398329999999305073288269340991973876953125
    },
    "last_point": {
        "ts": "2026-06-18T20:20:25+00:00",
        "lat": 46.66226999999999947021933621726930141448974609375,
        "lon": 142.660760000000010450094123370945453643798828125
    }
}
Methodology: 2026.01.18
Zone Dwell Sakhalin South Approach
Jun 18, 2026 13:01 UTC 80.0% ▼
  • Zone: Sakhalin South Approach
  • Duration: 6h 22m
  • Data Points: 32 AIS positions
  • Period: 2026-06-18T13:58:24+00:00 to 2026-06-18T20:20:25+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "dwell_minutes": 382,
    "points_in_zone": 32,
    "first_point": {
        "ts": "2026-06-18T13:58:24+00:00",
        "lat": 46.6543716999999986683178576640784740447998046875,
        "lon": 142.65398329999999305073288269340991973876953125
    },
    "last_point": {
        "ts": "2026-06-18T20:20:25+00:00",
        "lat": 46.66226999999999947021933621726930141448974609375,
        "lon": 142.660760000000010450094123370945453643798828125
    }
}
Methodology: 2026.01.18
Zone Dwell Sakhalin South Approach
Jun 18, 2026 12:00 UTC 80.0% ▼
  • Zone: Sakhalin South Approach
  • Duration: 6h 8m
  • Data Points: 77 AIS positions
  • Period: 2026-06-18T12:00:06+00:00 to 2026-06-18T18:08:24+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "dwell_minutes": 368.30000000000001136868377216160297393798828125,
    "points_in_zone": 77,
    "first_point": {
        "ts": "2026-06-18T12:00:06+00:00",
        "lat": 46.36171829999999971505530993454158306121826171875,
        "lon": 142.529038299999996297628968022763729095458984375
    },
    "last_point": {
        "ts": "2026-06-18T18:08:24+00:00",
        "lat": 46.66312500000000085265128291212022304534912109375,
        "lon": 142.660343299999993860183167271316051483154296875
    }
}
Methodology: 2026.01.18
Zone Dwell Prigorodnoye/Sakhalin LNG
Jun 18, 2026 12:00 UTC 80.0% ▼
  • Zone: Prigorodnoye/Sakhalin LNG
  • Duration: 6h 8m
  • Data Points: 77 AIS positions
  • Period: 2026-06-18T12:00:06+00:00 to 2026-06-18T18:08:24+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "dwell_minutes": 368.30000000000001136868377216160297393798828125,
    "points_in_zone": 77,
    "first_point": {
        "ts": "2026-06-18T12:00:06+00:00",
        "lat": 46.36171829999999971505530993454158306121826171875,
        "lon": 142.529038299999996297628968022763729095458984375
    },
    "last_point": {
        "ts": "2026-06-18T18:08:24+00:00",
        "lat": 46.66312500000000085265128291212022304534912109375,
        "lon": 142.660343299999993860183167271316051483154296875
    }
}
Methodology: 2026.01.18
Zone Dwell Sakhalin South Approach
Jun 18, 2026 11:20 UTC 80.0% ▼
  • Zone: Sakhalin South Approach
  • Duration: 6h 36m
  • Data Points: 83 AIS positions
  • Period: 2026-06-18T11:32:24+00:00 to 2026-06-18T18:08:24+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "dwell_minutes": 396,
    "points_in_zone": 83,
    "first_point": {
        "ts": "2026-06-18T11:32:24+00:00",
        "lat": 46.28278999999999854253474040888249874114990234375,
        "lon": 142.491136699999998427301761694252490997314453125
    },
    "last_point": {
        "ts": "2026-06-18T18:08:24+00:00",
        "lat": 46.66312500000000085265128291212022304534912109375,
        "lon": 142.660343299999993860183167271316051483154296875
    }
}
Methodology: 2026.01.18
Zone Dwell Prigorodnoye/Sakhalin LNG
Jun 18, 2026 11:20 UTC 80.0% ▼
  • Zone: Prigorodnoye/Sakhalin LNG
  • Duration: 6h 36m
  • Data Points: 83 AIS positions
  • Period: 2026-06-18T11:32:24+00:00 to 2026-06-18T18:08:24+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "dwell_minutes": 396,
    "points_in_zone": 83,
    "first_point": {
        "ts": "2026-06-18T11:32:24+00:00",
        "lat": 46.28278999999999854253474040888249874114990234375,
        "lon": 142.491136699999998427301761694252490997314453125
    },
    "last_point": {
        "ts": "2026-06-18T18:08:24+00:00",
        "lat": 46.66312500000000085265128291212022304534912109375,
        "lon": 142.660343299999993860183167271316051483154296875
    }
}
Methodology: 2026.01.18
Ais Gap🛰️✗ Prigorodnoye/Sakhalin LNG
Jun 1, 2026 09:10 UTC 70.0% ▼
  • Gap Duration: 6h 4m
  • Last Seen: 2026-06-01T09:10:20+00:00 at 46.3237, 142.5153 (Zone: Prigorodnoye/Sakhalin LNG)
  • Next Seen: 2026-06-01T15:14:40+00:00 at 46.1588, 141.6781

🛰️ Gap Corroboration

✗ No Imagery

These are snapshots that may corroborate presence during the gap. They do not reconstruct a continuous route.

SAR Imagery (Sentinel-1)

Status: ✗ No SAR coverage

No Sentinel-1 scenes covering corridor and time window

VIIRS Thermal Anomaly

Status: ✗ No detections

No VIIRS thermal/light detections in corridor

Searched: 2026-06-01T15:30:10.867224+00:00

Show Raw Evidence JSON
{
    "gap_minutes": 364.30000000000001136868377216160297393798828125,
    "last_seen": {
        "ts": "2026-06-01T09:10:20+00:00",
        "lat": 46.323683299999999007923179306089878082275390625,
        "lon": 142.51525670000000900472514331340789794921875,
        "sog": 10.300000000000000710542735760100185871124267578125,
        "zone_id": "russia_prigorodnoye"
    },
    "next_seen": {
        "ts": "2026-06-01T15:14:40+00:00",
        "lat": 46.1587932999999992489392752759158611297607421875,
        "lon": 141.67806500000000369254848919808864593505859375,
        "zone_ids": [
            "discovered_197"
        ]
    },
    "gap_enrichment": {
        "status": "not_found",
        "corridor": {
            "start": {
                "lat": 46.323683299999999007923179306089878082275390625,
                "lon": 142.51525670000000900472514331340789794921875,
                "ts": "2026-06-01T09:10:20+00:00"
            },
            "end": {
                "lat": 46.1587932999999992489392752759158611297607421875,
                "lon": 141.67806500000000369254848919808864593505859375,
                "ts": "2026-06-01T15:14:40+00:00"
            },
            "bbox": {
                "min_lat": 45.97861300000000284171619568951427936553955078125,
                "min_lon": 141.4175470000000132131390273571014404296875,
                "max_lat": 46.50386300000000261434252024628221988677978515625,
                "max_lon": 142.77577400000001262014848180115222930908203125
            },
            "buffer_km": 20
        },
        "sar": {
            "status": "not_found",
            "notes": "No Sentinel-1 scenes covering corridor and time window"
        },
        "viirs": {
            "status": "not_found",
            "notes": "No VIIRS thermal\/light detections in corridor"
        },
        "searched_at": "2026-06-01T15:30:10.867224+00:00"
    }
}
Methodology: 2026.01.18
Ais Gap🛰️✗ Sakhalin South Approach
Jun 1, 2026 09:10 UTC 70.0% ▼
  • Gap Duration: 6h 4m
  • Last Seen: 2026-06-01T09:10:20+00:00 at 46.3237, 142.5153 (Zone: Sakhalin South Approach)
  • Next Seen: 2026-06-01T15:14:40+00:00 at 46.1588, 141.6781

🛰️ Gap Corroboration

✗ No Imagery

These are snapshots that may corroborate presence during the gap. They do not reconstruct a continuous route.

SAR Imagery (Sentinel-1)

Status: ✗ No SAR coverage

No Sentinel-1 scenes covering corridor and time window

VIIRS Thermal Anomaly

Status: ✗ No detections

No VIIRS thermal/light detections in corridor

Searched: 2026-06-01T15:30:02.228759+00:00

Show Raw Evidence JSON
{
    "gap_minutes": 364.30000000000001136868377216160297393798828125,
    "last_seen": {
        "ts": "2026-06-01T09:10:20+00:00",
        "lat": 46.323683299999999007923179306089878082275390625,
        "lon": 142.51525670000000900472514331340789794921875,
        "sog": 10.300000000000000710542735760100185871124267578125,
        "zone_id": "russia_sakhalin_south"
    },
    "next_seen": {
        "ts": "2026-06-01T15:14:40+00:00",
        "lat": 46.1587932999999992489392752759158611297607421875,
        "lon": 141.67806500000000369254848919808864593505859375,
        "zone_ids": [
            "discovered_197"
        ]
    },
    "gap_enrichment": {
        "status": "not_found",
        "corridor": {
            "start": {
                "lat": 46.323683299999999007923179306089878082275390625,
                "lon": 142.51525670000000900472514331340789794921875,
                "ts": "2026-06-01T09:10:20+00:00"
            },
            "end": {
                "lat": 46.1587932999999992489392752759158611297607421875,
                "lon": 141.67806500000000369254848919808864593505859375,
                "ts": "2026-06-01T15:14:40+00:00"
            },
            "bbox": {
                "min_lat": 45.97861300000000284171619568951427936553955078125,
                "min_lon": 141.4175470000000132131390273571014404296875,
                "max_lat": 46.50386300000000261434252024628221988677978515625,
                "max_lon": 142.77577400000001262014848180115222930908203125
            },
            "buffer_km": 20
        },
        "sar": {
            "status": "not_found",
            "notes": "No Sentinel-1 scenes covering corridor and time window"
        },
        "viirs": {
            "status": "not_found",
            "notes": "No VIIRS thermal\/light detections in corridor"
        },
        "searched_at": "2026-06-01T15:30:02.228759+00:00"
    }
}
Methodology: 2026.01.18
Zone Dwell Sakhalin South Approach
Jun 1, 2026 08:00 UTC 80.0% ▼
  • Zone: Sakhalin South Approach
  • Duration: 1h 9m
  • Data Points: 34 AIS positions
  • Period: 2026-06-01T08:00:30+00:00 to 2026-06-01T09:10:20+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "dwell_minutes": 69.7999999999999971578290569595992565155029296875,
    "points_in_zone": 34,
    "first_point": {
        "ts": "2026-06-01T08:00:30+00:00",
        "lat": 46.51206169999999673336787964217364788055419921875,
        "lon": 142.62737329999998792118276469409465789794921875
    },
    "last_point": {
        "ts": "2026-06-01T09:10:20+00:00",
        "lat": 46.323683299999999007923179306089878082275390625,
        "lon": 142.51525670000000900472514331340789794921875
    }
}
Methodology: 2026.01.18
Zone Dwell Prigorodnoye/Sakhalin LNG
Jun 1, 2026 08:00 UTC 80.0% ▼
  • Zone: Prigorodnoye/Sakhalin LNG
  • Duration: 1h 9m
  • Data Points: 34 AIS positions
  • Period: 2026-06-01T08:00:30+00:00 to 2026-06-01T09:10:20+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "dwell_minutes": 69.7999999999999971578290569595992565155029296875,
    "points_in_zone": 34,
    "first_point": {
        "ts": "2026-06-01T08:00:30+00:00",
        "lat": 46.51206169999999673336787964217364788055419921875,
        "lon": 142.62737329999998792118276469409465789794921875
    },
    "last_point": {
        "ts": "2026-06-01T09:10:20+00:00",
        "lat": 46.323683299999999007923179306089878082275390625,
        "lon": 142.51525670000000900472514331340789794921875
    }
}
Methodology: 2026.01.18
Zone Dwell Prigorodnoye/Sakhalin LNG
Jun 1, 2026 07:01 UTC 80.0% ▼
  • Zone: Prigorodnoye/Sakhalin LNG
  • Duration: 2h 8m
  • Data Points: 58 AIS positions
  • Period: 2026-06-01T07:01:49+00:00 to 2026-06-01T09:10:20+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "dwell_minutes": 128.5,
    "points_in_zone": 58,
    "first_point": {
        "ts": "2026-06-01T07:01:49+00:00",
        "lat": 46.60309829999999919891706667840480804443359375,
        "lon": 142.673129999999986239345162175595760345458984375
    },
    "last_point": {
        "ts": "2026-06-01T09:10:20+00:00",
        "lat": 46.323683299999999007923179306089878082275390625,
        "lon": 142.51525670000000900472514331340789794921875
    }
}
Methodology: 2026.01.18
Zone Dwell Sakhalin South Approach
Jun 1, 2026 07:01 UTC 80.0% ▼
  • Zone: Sakhalin South Approach
  • Duration: 2h 8m
  • Data Points: 58 AIS positions
  • Period: 2026-06-01T07:01:49+00:00 to 2026-06-01T09:10:20+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "dwell_minutes": 128.5,
    "points_in_zone": 58,
    "first_point": {
        "ts": "2026-06-01T07:01:49+00:00",
        "lat": 46.60309829999999919891706667840480804443359375,
        "lon": 142.673129999999986239345162175595760345458984375
    },
    "last_point": {
        "ts": "2026-06-01T09:10:20+00:00",
        "lat": 46.323683299999999007923179306089878082275390625,
        "lon": 142.51525670000000900472514331340789794921875
    }
}
Methodology: 2026.01.18
Zone Dwell Prigorodnoye/Sakhalin LNG
Jun 1, 2026 06:01 UTC 80.0% ▼
  • Zone: Prigorodnoye/Sakhalin LNG
  • Duration: 3h 8m
  • Data Points: 68 AIS positions
  • Period: 2026-06-01T06:01:48+00:00 to 2026-06-01T09:10:20+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "dwell_minutes": 188.5,
    "points_in_zone": 68,
    "first_point": {
        "ts": "2026-06-01T06:01:48+00:00",
        "lat": 46.60308330000000154313966049812734127044677734375,
        "lon": 142.672968300000007957351044751703739166259765625
    },
    "last_point": {
        "ts": "2026-06-01T09:10:20+00:00",
        "lat": 46.323683299999999007923179306089878082275390625,
        "lon": 142.51525670000000900472514331340789794921875
    }
}
Methodology: 2026.01.18
Zone Dwell Sakhalin South Approach
Jun 1, 2026 06:01 UTC 80.0% ▼
  • Zone: Sakhalin South Approach
  • Duration: 3h 8m
  • Data Points: 68 AIS positions
  • Period: 2026-06-01T06:01:48+00:00 to 2026-06-01T09:10:20+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "dwell_minutes": 188.5,
    "points_in_zone": 68,
    "first_point": {
        "ts": "2026-06-01T06:01:48+00:00",
        "lat": 46.60308330000000154313966049812734127044677734375,
        "lon": 142.672968300000007957351044751703739166259765625
    },
    "last_point": {
        "ts": "2026-06-01T09:10:20+00:00",
        "lat": 46.323683299999999007923179306089878082275390625,
        "lon": 142.51525670000000900472514331340789794921875
    }
}
Methodology: 2026.01.18
Zone Dwell Prigorodnoye/Sakhalin LNG
Jun 1, 2026 05:01 UTC 80.0% ▼
  • Zone: Prigorodnoye/Sakhalin LNG
  • Duration: 4h 8m
  • Data Points: 78 AIS positions
  • Period: 2026-06-01T05:01:48+00:00 to 2026-06-01T09:10:20+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "dwell_minutes": 248.5,
    "points_in_zone": 78,
    "first_point": {
        "ts": "2026-06-01T05:01:48+00:00",
        "lat": 46.60291829999999890787876211106777191162109375,
        "lon": 142.672335000000003901732270605862140655517578125
    },
    "last_point": {
        "ts": "2026-06-01T09:10:20+00:00",
        "lat": 46.323683299999999007923179306089878082275390625,
        "lon": 142.51525670000000900472514331340789794921875
    }
}
Methodology: 2026.01.18
Zone Dwell Sakhalin South Approach
Jun 1, 2026 05:01 UTC 80.0% ▼
  • Zone: Sakhalin South Approach
  • Duration: 4h 8m
  • Data Points: 78 AIS positions
  • Period: 2026-06-01T05:01:48+00:00 to 2026-06-01T09:10:20+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "dwell_minutes": 248.5,
    "points_in_zone": 78,
    "first_point": {
        "ts": "2026-06-01T05:01:48+00:00",
        "lat": 46.60291829999999890787876211106777191162109375,
        "lon": 142.672335000000003901732270605862140655517578125
    },
    "last_point": {
        "ts": "2026-06-01T09:10:20+00:00",
        "lat": 46.323683299999999007923179306089878082275390625,
        "lon": 142.51525670000000900472514331340789794921875
    }
}
Methodology: 2026.01.18
Loiter Prigorodnoye/Sakhalin LNG
Jun 1, 2026 05:01 UTC 75.0% ▼
  • Duration: 2h 23m
  • Radius: 292 meters
  • Data Points: 25 AIS positions
  • Centroid: 46.6029, 142.6728
  • Zone: Prigorodnoye/Sakhalin LNG
Show Raw Evidence JSON
{
    "radius_m": 291.80000000000001136868377216160297393798828125,
    "duration_minutes": 143.69999999999998863131622783839702606201171875,
    "points": 25,
    "centroid": {
        "lat": 46.602947868000001108157448470592498779296875,
        "lon": 142.67276933600004440449993126094341278076171875
    },
    "bbox": {
        "min_lat": 46.60120169999999717447281000204384326934814453125,
        "min_lon": 142.669925000000006320988177321851253509521484375,
        "max_lat": 46.60312830000000161589923663996160030364990234375,
        "max_lon": 142.673489999999986821421771310269832611083984375
    },
    "zone_id": "russia_prigorodnoye"
}
Methodology: 2026.01.18
Loiter Sakhalin South Approach
Jun 1, 2026 05:01 UTC 75.0% ▼
  • Duration: 2h 23m
  • Radius: 292 meters
  • Data Points: 25 AIS positions
  • Centroid: 46.6029, 142.6728
  • Zone: Sakhalin South Approach
Show Raw Evidence JSON
{
    "radius_m": 291.80000000000001136868377216160297393798828125,
    "duration_minutes": 143.69999999999998863131622783839702606201171875,
    "points": 25,
    "centroid": {
        "lat": 46.602947868000001108157448470592498779296875,
        "lon": 142.67276933600004440449993126094341278076171875
    },
    "bbox": {
        "min_lat": 46.60120169999999717447281000204384326934814453125,
        "min_lon": 142.669925000000006320988177321851253509521484375,
        "max_lat": 46.60312830000000161589923663996160030364990234375,
        "max_lon": 142.673489999999986821421771310269832611083984375
    },
    "zone_id": "russia_sakhalin_south"
}
Methodology: 2026.01.18
Zone Dwell Sakhalin South Approach
Jun 1, 2026 04:01 UTC 80.0% ▼
  • Zone: Sakhalin South Approach
  • Duration: 5h 8m
  • Data Points: 93 AIS positions
  • Period: 2026-06-01T04:01:47+00:00 to 2026-06-01T09:10:20+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "dwell_minutes": 308.6000000000000227373675443232059478759765625,
    "points_in_zone": 93,
    "first_point": {
        "ts": "2026-06-01T04:01:47+00:00",
        "lat": 46.6026949999999970941644278354942798614501953125,
        "lon": 142.672396700000007285780156962573528289794921875
    },
    "last_point": {
        "ts": "2026-06-01T09:10:20+00:00",
        "lat": 46.323683299999999007923179306089878082275390625,
        "lon": 142.51525670000000900472514331340789794921875
    }
}
Methodology: 2026.01.18
Zone Dwell Prigorodnoye/Sakhalin LNG
Jun 1, 2026 04:01 UTC 80.0% ▼
  • Zone: Prigorodnoye/Sakhalin LNG
  • Duration: 5h 8m
  • Data Points: 93 AIS positions
  • Period: 2026-06-01T04:01:47+00:00 to 2026-06-01T09:10:20+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "dwell_minutes": 308.6000000000000227373675443232059478759765625,
    "points_in_zone": 93,
    "first_point": {
        "ts": "2026-06-01T04:01:47+00:00",
        "lat": 46.6026949999999970941644278354942798614501953125,
        "lon": 142.672396700000007285780156962573528289794921875
    },
    "last_point": {
        "ts": "2026-06-01T09:10:20+00:00",
        "lat": 46.323683299999999007923179306089878082275390625,
        "lon": 142.51525670000000900472514331340789794921875
    }
}
Methodology: 2026.01.18
Loiter Prigorodnoye/Sakhalin LNG
Jun 1, 2026 04:01 UTC 75.0% ▼
  • Duration: 3h 23m
  • Radius: 282 meters
  • Data Points: 40 AIS positions
  • Centroid: 46.6029, 142.6727
  • Zone: Prigorodnoye/Sakhalin LNG
Show Raw Evidence JSON
{
    "radius_m": 282,
    "duration_minutes": 203.69999999999998863131622783839702606201171875,
    "points": 40,
    "centroid": {
        "lat": 46.6028802075000072591137723065912723541259765625,
        "lon": 142.672684040000007144044502638280391693115234375
    },
    "bbox": {
        "min_lat": 46.60120169999999717447281000204384326934814453125,
        "min_lon": 142.669925000000006320988177321851253509521484375,
        "max_lat": 46.60312830000000161589923663996160030364990234375,
        "max_lon": 142.673489999999986821421771310269832611083984375
    },
    "zone_id": "russia_prigorodnoye"
}
Methodology: 2026.01.18
Loiter Sakhalin South Approach
Jun 1, 2026 04:01 UTC 75.0% ▼
  • Duration: 3h 23m
  • Radius: 282 meters
  • Data Points: 40 AIS positions
  • Centroid: 46.6029, 142.6727
  • Zone: Sakhalin South Approach
Show Raw Evidence JSON
{
    "radius_m": 282,
    "duration_minutes": 203.69999999999998863131622783839702606201171875,
    "points": 40,
    "centroid": {
        "lat": 46.6028802075000072591137723065912723541259765625,
        "lon": 142.672684040000007144044502638280391693115234375
    },
    "bbox": {
        "min_lat": 46.60120169999999717447281000204384326934814453125,
        "min_lon": 142.669925000000006320988177321851253509521484375,
        "max_lat": 46.60312830000000161589923663996160030364990234375,
        "max_lon": 142.673489999999986821421771310269832611083984375
    },
    "zone_id": "russia_sakhalin_south"
}
Methodology: 2026.01.18

Recent Position Data

Time (UTC) Lat Lon Speed Course Zone
Jun 19 07:36 46.2216 143.1772 10.9 kn 160.9° Prigorodnoye/Sakhalin LNG
Jun 19 07:35 46.2259 143.1747 10.9 kn 158.9° Prigorodnoye/Sakhalin LNG
Jun 19 07:29 46.2410 143.1662 10.9 kn 159.1° Prigorodnoye/Sakhalin LNG
Jun 19 07:17 46.2751 143.1464 11.1 kn 155.6° Prigorodnoye/Sakhalin LNG
Jun 19 07:15 46.2814 143.1424 11.1 kn 156.7° Prigorodnoye/Sakhalin LNG
Jun 19 07:11 46.2931 143.1345 11.2 kn 151.2° Prigorodnoye/Sakhalin LNG
Jun 19 07:08 46.3006 143.1291 11.3 kn 153.4° Prigorodnoye/Sakhalin LNG
Jun 19 07:04 46.3116 143.1213 11.3 kn 154.3° Prigorodnoye/Sakhalin LNG
Jun 19 07:01 46.3205 143.1149 11.4 kn 151.8° Prigorodnoye/Sakhalin LNG
Jun 19 06:59 46.3271 143.1102 11.5 kn 154.7° Prigorodnoye/Sakhalin LNG
Jun 19 06:52 46.3457 143.0978 11.1 kn 153.8° Prigorodnoye/Sakhalin LNG
Jun 19 06:51 46.3499 143.0951 11.2 kn 155.8° Prigorodnoye/Sakhalin LNG
Jun 19 06:48 46.3584 143.0898 11.1 kn 156.9° Prigorodnoye/Sakhalin LNG
Jun 19 06:47 46.3613 143.0881 11.1 kn 157.0° Prigorodnoye/Sakhalin LNG
Jun 19 06:46 46.3642 143.0863 11.1 kn 157.6° Prigorodnoye/Sakhalin LNG
Jun 19 06:45 46.3670 143.0846 11.0 kn 156.2° Prigorodnoye/Sakhalin LNG
Jun 19 06:42 46.3756 143.0797 10.9 kn 158.0° Prigorodnoye/Sakhalin LNG
Jun 19 06:38 46.3877 143.0726 10.8 kn 155.3° Prigorodnoye/Sakhalin LNG
Jun 19 06:37 46.3905 143.0710 10.8 kn 159.2° Prigorodnoye/Sakhalin LNG
Jun 19 06:33 46.3998 143.0655 10.8 kn 158.6° 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.