MUSUNG

Vessel information

Vessel Name MUSUNG
MMSI 440709700
Vessel Type Tanker
Flag 🏳️ REPUBLIC OF KOREA
Call Sign SSD
Length 40 m
Beam 10 m

Detected Events (25)

Sts🛰️✗ Strait of Gibraltar Surveillance Zone
Jul 31, 2026 18:05 UTC 75/100 ▼
Vessel A: MMSI 440308690 (CHEONGHAE3HO) REPUBLIC OF KOREA
Vessel B: MMSI 440709700 (MUSUNG) REPUBLIC OF KOREA
  • Minimum Distance: 6 meters
  • Average Distance: 14 meters
  • Duration: 35 minutes
  • Period: 2026-07-31T18:05:33+00:00 to 2026-07-31T18:41:14+00:00
  • Vessel A Avg Speed: 0.1 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Strait of Gibraltar Surveillance Zone

Confidence Analysis

Score: 75/100

Moderate-confidence STS candidate. Two tankers (CHEONGHAE3HO and MUSUNG) maintained close proximity (min 6m, avg 14m) for 36 minutes. Both vessels were slow-moving (avg speeds 0.1 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Strait of Gibraltar Surveillance Zone, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness25/25Min distance 6m, avg 14m
Duration5/25Duration 36 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±4m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Strait of Gibraltar Surveillance Zone

🛰️ Satellite Corroboration

✗ SAR Not Available

No satellite imagery for this time/location

No Sentinel-1 scenes covering AOI and time window

Searched: 2026-08-01T00:45:02.170314+00:00

Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 440308690,
        "name": "CHEONGHAE3HO",
        "flag": "REPUBLIC OF KOREA"
    },
    "vessel_b": {
        "mmsi": 440709700,
        "name": "MUSUNG",
        "flag": "REPUBLIC OF KOREA"
    },
    "min_distance_m": 6.0999999999999996447286321199499070644378662109375,
    "avg_distance_m": 14.199999999999999289457264239899814128875732421875,
    "distance_consistency_m": 3.79999999999999982236431605997495353221893310546875,
    "duration_minutes": 35.7000000000000028421709430404007434844970703125,
    "overlap_duration_s": 2141,
    "speed_a_avg": 0.1000000000000000055511151231257827021181583404541015625,
    "speed_a_std": 0.070000000000000006661338147750939242541790008544921875,
    "speed_b_avg": 0.01000000000000000020816681711721685132943093776702880859375,
    "speed_b_std": 0.0299999999999999988897769753748434595763683319091796875,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.1000000000000000055511151231257827021181583404541015625,
            "max_sog": 0.200000000000000011102230246251565404236316680908203125
        },
        "vessel_b": {
            "avg_sog": 0.01000000000000000020816681711721685132943093776702880859375,
            "max_sog": 0.1000000000000000055511151231257827021181583404541015625
        }
    },
    "time_window": {
        "start": "2026-07-31T18:05:33+00:00",
        "end": "2026-07-31T18:41:14+00:00"
    },
    "points_count": {
        "vessel_a": 10,
        "vessel_b": 10
    },
    "zone_id": "discovered_001",
    "zone_name": "Strait of Gibraltar Surveillance Zone",
    "score": {
        "value": 75,
        "components": {
            "distance_tightness": {
                "score": 25,
                "max": 25,
                "detail": "Min distance 6m, avg 14m"
            },
            "duration": {
                "score": 5,
                "max": 25,
                "detail": "Duration 36 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b14m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Strait of Gibraltar Surveillance Zone"
            }
        },
        "summary": "Moderate-confidence STS candidate. Two tankers (CHEONGHAE3HO and MUSUNG) maintained close proximity (min 6m, avg 14m) for 36 minutes. Both vessels were slow-moving (avg speeds 0.1 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Strait of Gibraltar Surveillance Zone, a known STS activity area."
    },
    "sar": {
        "status": "not_found",
        "centroid": {
            "lat": 35.0070742999999993116944096982479095458984375,
            "lon": 129.050440699999995786129147745668888092041015625
        },
        "time_window": {
            "start_ts": "2026-07-31T18:05:33+00:00",
            "end_ts": "2026-07-31T18:41:14+00:00"
        },
        "searched_at": "2026-08-01T00:45:02.170314+00:00",
        "notes": "No Sentinel-1 scenes covering AOI and time window"
    }
}
Methodology: 2026.01.18
Zone Dwell Strait of Gibraltar Surveillance Zone
Jul 31, 2026 18:01 UTC 80.0% ▼
  • Zone: Strait of Gibraltar Surveillance Zone
  • Duration: 1h 2m
  • Data Points: 20 AIS positions
  • Period: 2026-07-31T18:01:26+00:00 to 2026-07-31T19:04:06+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_001",
    "zone_name": "Strait of Gibraltar Surveillance Zone",
    "dwell_minutes": 62.7000000000000028421709430404007434844970703125,
    "points_in_zone": 20,
    "first_point": {
        "ts": "2026-07-31T18:01:26+00:00",
        "lat": 35.00692000000000092541085905395448207855224609375,
        "lon": 129.050293299999992768789525143802165985107421875
    },
    "last_point": {
        "ts": "2026-07-31T19:04:06+00:00",
        "lat": 35.03002500000000196678229258395731449127197265625,
        "lon": 129.09457670000000462096068076789379119873046875
    }
}
Methodology: 2026.01.18
Sts🛰️✗ Strait of Gibraltar Surveillance Zone
Jul 31, 2026 17:05 UTC 90/100 ▼
Vessel A: MMSI 440709700 (MUSUNG) REPUBLIC OF KOREA
Vessel B: MMSI 440308690 (CHEONGHAE3HO) REPUBLIC OF KOREA
  • Minimum Distance: 9 meters
  • Average Distance: 16 meters
  • Duration: 1h 33m
  • Period: 2026-07-31T17:08:06+00:00 to 2026-07-31T18:41:27+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.1 knots
  • Zone: Strait of Gibraltar Surveillance Zone

Confidence Analysis

Score: 90/100

High-confidence STS candidate. Two tankers (MUSUNG and CHEONGHAE3HO) maintained close proximity (min 9m, avg 16m) for 93 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.1 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Strait of Gibraltar Surveillance Zone, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness25/25Min distance 9m, avg 16m
Duration20/25Duration 93 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±3m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Strait of Gibraltar Surveillance Zone

🛰️ Satellite Corroboration

✗ SAR Not Available

No satellite imagery for this time/location

No Sentinel-1 scenes covering AOI and time window

Searched: 2026-07-31T23:45:01.974423+00:00

Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 440709700,
        "name": "MUSUNG",
        "flag": "REPUBLIC OF KOREA"
    },
    "vessel_b": {
        "mmsi": 440308690,
        "name": "CHEONGHAE3HO",
        "flag": "REPUBLIC OF KOREA"
    },
    "min_distance_m": 9.0999999999999996447286321199499070644378662109375,
    "avg_distance_m": 16.10000000000000142108547152020037174224853515625,
    "distance_consistency_m": 3.20000000000000017763568394002504646778106689453125,
    "duration_minutes": 93.2999999999999971578290569595992565155029296875,
    "overlap_duration_s": 5601,
    "speed_a_avg": 0.0200000000000000004163336342344337026588618755340576171875,
    "speed_a_std": 0.040000000000000000832667268468867405317723751068115234375,
    "speed_b_avg": 0.11999999999999999555910790149937383830547332763671875,
    "speed_b_std": 0.070000000000000006661338147750939242541790008544921875,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.0200000000000000004163336342344337026588618755340576171875,
            "max_sog": 0.1000000000000000055511151231257827021181583404541015625
        },
        "vessel_b": {
            "avg_sog": 0.11999999999999999555910790149937383830547332763671875,
            "max_sog": 0.200000000000000011102230246251565404236316680908203125
        }
    },
    "time_window": {
        "start": "2026-07-31T17:08:06+00:00",
        "end": "2026-07-31T18:41:27+00:00"
    },
    "points_count": {
        "vessel_a": 15,
        "vessel_b": 15
    },
    "zone_id": "discovered_001",
    "zone_name": "Strait of Gibraltar Surveillance Zone",
    "score": {
        "value": 90,
        "components": {
            "distance_tightness": {
                "score": 25,
                "max": 25,
                "detail": "Min distance 9m, avg 16m"
            },
            "duration": {
                "score": 20,
                "max": 25,
                "detail": "Duration 93 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b13m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Strait of Gibraltar Surveillance Zone"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (MUSUNG and CHEONGHAE3HO) maintained close proximity (min 9m, avg 16m) for 93 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.1 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Strait of Gibraltar Surveillance Zone, a known STS activity area."
    },
    "sar": {
        "status": "not_found",
        "centroid": {
            "lat": 35.00708900000000056706994655542075634002685546875,
            "lon": 129.05043649999998933708411641418933868408203125
        },
        "time_window": {
            "start_ts": "2026-07-31T17:05:34+00:00",
            "end_ts": "2026-07-31T18:41:27+00:00"
        },
        "searched_at": "2026-07-31T23:45:01.974423+00:00",
        "notes": "No Sentinel-1 scenes covering AOI and time window"
    }
}
Methodology: 2026.01.18
Zone Dwell Strait of Gibraltar Surveillance Zone
Jul 31, 2026 17:00 UTC 80.0% ▼
  • Zone: Strait of Gibraltar Surveillance Zone
  • Duration: 2h 3m
  • Data Points: 27 AIS positions
  • Period: 2026-07-31T17:00:11+00:00 to 2026-07-31T19:04:06+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_001",
    "zone_name": "Strait of Gibraltar Surveillance Zone",
    "dwell_minutes": 123.900000000000005684341886080801486968994140625,
    "points_in_zone": 27,
    "first_point": {
        "ts": "2026-07-31T17:00:11+00:00",
        "lat": 35.00753329999999863275661482475697994232177734375,
        "lon": 129.05036169999999628998921252787113189697265625
    },
    "last_point": {
        "ts": "2026-07-31T19:04:06+00:00",
        "lat": 35.03002500000000196678229258395731449127197265625,
        "lon": 129.09457670000000462096068076789379119873046875
    }
}
Methodology: 2026.01.18
Loiter Strait of Gibraltar Surveillance Zone
Jul 31, 2026 17:00 UTC 75.0% ▼
  • Duration: 1h 50m
  • Radius: 979 meters
  • Data Points: 23 AIS positions
  • Centroid: 35.0073, 129.0515
  • Zone: Strait of Gibraltar Surveillance Zone
Show Raw Evidence JSON
{
    "radius_m": 978.799999999999954525264911353588104248046875,
    "duration_minutes": 110.900000000000005684341886080801486968994140625,
    "points": 23,
    "centroid": {
        "lat": 35.00726000434782037018521805293858051300048828125,
        "lon": 129.05148276086953273988910950720310211181640625
    },
    "bbox": {
        "min_lat": 35.005591699999996535552782006561756134033203125,
        "min_lon": 129.04896999999999707142706029117107391357421875,
        "max_lat": 35.0097717000000017151251086033880710601806640625,
        "max_lon": 129.061761700000005248512024991214275360107421875
    },
    "zone_id": "discovered_001"
}
Methodology: 2026.01.18
Zone Dwell Strait of Gibraltar Surveillance Zone
Jul 31, 2026 16:01 UTC 80.0% ▼
  • Zone: Strait of Gibraltar Surveillance Zone
  • Duration: 3h 2m
  • Data Points: 43 AIS positions
  • Period: 2026-07-31T16:01:25+00:00 to 2026-07-31T19:04:06+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_001",
    "zone_name": "Strait of Gibraltar Surveillance Zone",
    "dwell_minutes": 182.69999999999998863131622783839702606201171875,
    "points_in_zone": 43,
    "first_point": {
        "ts": "2026-07-31T16:01:25+00:00",
        "lat": 35.0073450000000008230927051045000553131103515625,
        "lon": 129.050375000000002501110429875552654266357421875
    },
    "last_point": {
        "ts": "2026-07-31T19:04:06+00:00",
        "lat": 35.03002500000000196678229258395731449127197265625,
        "lon": 129.09457670000000462096068076789379119873046875
    }
}
Methodology: 2026.01.18
Loiter Strait of Gibraltar Surveillance Zone
Jul 31, 2026 16:01 UTC 75.0% ▼
  • Duration: 2h 49m
  • Radius: 1,016 meters
  • Data Points: 39 AIS positions
  • Centroid: 35.0073, 129.0510
  • Zone: Strait of Gibraltar Surveillance Zone
Show Raw Evidence JSON
{
    "radius_m": 1016.1000000000000227373675443232059478759765625,
    "duration_minutes": 169.69999999999998863131622783839702606201171875,
    "points": 39,
    "centroid": {
        "lat": 35.00729735641026962866817484609782695770263671875,
        "lon": 129.05104329487176073598675429821014404296875
    },
    "bbox": {
        "min_lat": 35.005591699999996535552782006561756134033203125,
        "min_lon": 129.04896999999999707142706029117107391357421875,
        "max_lat": 35.0097717000000017151251086033880710601806640625,
        "max_lon": 129.061761700000005248512024991214275360107421875
    },
    "zone_id": "discovered_001"
}
Methodology: 2026.01.18
Sts Strait of Gibraltar Surveillance Zone
Jul 31, 2026 16:00 UTC 95/100 ▼
Vessel A: MMSI 440709700 (MUSUNG) REPUBLIC OF KOREA
Vessel B: MMSI 440308690 (CHEONGHAE3HO) REPUBLIC OF KOREA
  • Minimum Distance: 7 meters
  • Average Distance: 15 meters
  • Duration: 2h 24m
  • Period: 2026-07-31T16:16:58+00:00 to 2026-07-31T18:41:27+00:00
  • Vessel A Avg Speed: 0.1 knots
  • Vessel B Avg Speed: 0.1 knots
  • Zone: Strait of Gibraltar Surveillance Zone

Confidence Analysis

Score: 95/100

High-confidence STS candidate. Two tankers (MUSUNG and CHEONGHAE3HO) maintained close proximity (min 7m, avg 15m) for 144 minutes. Both vessels were slow-moving (avg speeds 0.1 and 0.1 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Strait of Gibraltar Surveillance Zone, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness25/25Min distance 7m, avg 15m
Duration25/25Duration 144 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±3m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Strait of Gibraltar Surveillance Zone
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 440709700,
        "name": "MUSUNG",
        "flag": "REPUBLIC OF KOREA"
    },
    "vessel_b": {
        "mmsi": 440308690,
        "name": "CHEONGHAE3HO",
        "flag": "REPUBLIC OF KOREA"
    },
    "min_distance_m": 6.79999999999999982236431605997495353221893310546875,
    "avg_distance_m": 14.5999999999999996447286321199499070644378662109375,
    "distance_consistency_m": 3.20000000000000017763568394002504646778106689453125,
    "duration_minutes": 144.5,
    "overlap_duration_s": 8669,
    "speed_a_avg": 0.05000000000000000277555756156289135105907917022705078125,
    "speed_a_std": 0.08000000000000000166533453693773481063544750213623046875,
    "speed_b_avg": 0.11000000000000000055511151231257827021181583404541015625,
    "speed_b_std": 0.070000000000000006661338147750939242541790008544921875,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.05000000000000000277555756156289135105907917022705078125,
            "max_sog": 0.299999999999999988897769753748434595763683319091796875
        },
        "vessel_b": {
            "avg_sog": 0.11000000000000000055511151231257827021181583404541015625,
            "max_sog": 0.299999999999999988897769753748434595763683319091796875
        }
    },
    "time_window": {
        "start": "2026-07-31T16:16:58+00:00",
        "end": "2026-07-31T18:41:27+00:00"
    },
    "points_count": {
        "vessel_a": 30,
        "vessel_b": 30
    },
    "zone_id": "discovered_001",
    "zone_name": "Strait of Gibraltar Surveillance Zone",
    "score": {
        "value": 95,
        "components": {
            "distance_tightness": {
                "score": 25,
                "max": 25,
                "detail": "Min distance 7m, avg 15m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 144 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b13m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Strait of Gibraltar Surveillance Zone"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (MUSUNG and CHEONGHAE3HO) maintained close proximity (min 7m, avg 15m) for 144 minutes. Both vessels were slow-moving (avg speeds 0.1 and 0.1 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Strait of Gibraltar Surveillance Zone, a known STS activity area."
    }
}
Methodology: 2026.01.18
Zone Dwell Strait of Gibraltar Surveillance Zone
Jul 31, 2026 15:04 UTC 80.0% ▼
  • Zone: Strait of Gibraltar Surveillance Zone
  • Duration: 3h 59m
  • Data Points: 53 AIS positions
  • Period: 2026-07-31T15:04:17+00:00 to 2026-07-31T19:04:06+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_001",
    "zone_name": "Strait of Gibraltar Surveillance Zone",
    "dwell_minutes": 239.80000000000001136868377216160297393798828125,
    "points_in_zone": 53,
    "first_point": {
        "ts": "2026-07-31T15:04:17+00:00",
        "lat": 35.00749499999999869714883971028029918670654296875,
        "lon": 129.050354999999996152837411500513553619384765625
    },
    "last_point": {
        "ts": "2026-07-31T19:04:06+00:00",
        "lat": 35.03002500000000196678229258395731449127197265625,
        "lon": 129.09457670000000462096068076789379119873046875
    }
}
Methodology: 2026.01.18
Sts🛰️✗ Strait of Gibraltar Surveillance Zone
Jul 31, 2026 15:04 UTC 95/100 ▼
Vessel A: MMSI 440709700 (MUSUNG) REPUBLIC OF KOREA
Vessel B: MMSI 440308690 (CHEONGHAE3HO) REPUBLIC OF KOREA
  • Minimum Distance: 7 meters
  • Average Distance: 16 meters
  • Duration: 3h 37m
  • Period: 2026-07-31T15:04:17+00:00 to 2026-07-31T18:41:27+00:00
  • Vessel A Avg Speed: 0.1 knots
  • Vessel B Avg Speed: 0.1 knots
  • Zone: Strait of Gibraltar Surveillance Zone

Confidence Analysis

Score: 95/100

High-confidence STS candidate. Two tankers (MUSUNG and CHEONGHAE3HO) maintained close proximity (min 7m, avg 16m) for 217 minutes. Both vessels were slow-moving (avg speeds 0.1 and 0.1 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Strait of Gibraltar Surveillance Zone, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness25/25Min distance 7m, avg 16m
Duration25/25Duration 217 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±5m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Strait of Gibraltar Surveillance Zone

🛰️ Satellite Corroboration

✗ SAR Not Available

No satellite imagery for this time/location

No Sentinel-1 scenes covering AOI and time window

Searched: 2026-07-31T21:30:07.098905+00:00

Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 440709700,
        "name": "MUSUNG",
        "flag": "REPUBLIC OF KOREA"
    },
    "vessel_b": {
        "mmsi": 440308690,
        "name": "CHEONGHAE3HO",
        "flag": "REPUBLIC OF KOREA"
    },
    "min_distance_m": 6.79999999999999982236431605997495353221893310546875,
    "avg_distance_m": 15.9000000000000003552713678800500929355621337890625,
    "distance_consistency_m": 4.5999999999999996447286321199499070644378662109375,
    "duration_minutes": 217.19999999999998863131622783839702606201171875,
    "overlap_duration_s": 13030,
    "speed_a_avg": 0.059999999999999997779553950749686919152736663818359375,
    "speed_a_std": 0.08000000000000000166533453693773481063544750213623046875,
    "speed_b_avg": 0.11999999999999999555910790149937383830547332763671875,
    "speed_b_std": 0.070000000000000006661338147750939242541790008544921875,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.059999999999999997779553950749686919152736663818359375,
            "max_sog": 0.299999999999999988897769753748434595763683319091796875
        },
        "vessel_b": {
            "avg_sog": 0.11999999999999999555910790149937383830547332763671875,
            "max_sog": 0.299999999999999988897769753748434595763683319091796875
        }
    },
    "time_window": {
        "start": "2026-07-31T15:04:17+00:00",
        "end": "2026-07-31T18:41:27+00:00"
    },
    "points_count": {
        "vessel_a": 44,
        "vessel_b": 44
    },
    "zone_id": "discovered_001",
    "zone_name": "Strait of Gibraltar Surveillance Zone",
    "score": {
        "value": 95,
        "components": {
            "distance_tightness": {
                "score": 25,
                "max": 25,
                "detail": "Min distance 7m, avg 16m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 217 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: Strait of Gibraltar Surveillance Zone"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (MUSUNG and CHEONGHAE3HO) maintained close proximity (min 7m, avg 16m) for 217 minutes. Both vessels were slow-moving (avg speeds 0.1 and 0.1 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Strait of Gibraltar Surveillance Zone, a known STS activity area."
    },
    "sar": {
        "status": "not_found",
        "centroid": {
            "lat": 35.00729460000000159425326273776590824127197265625,
            "lon": 129.050449100000008684219210408627986907958984375
        },
        "time_window": {
            "start_ts": "2026-07-31T15:04:17+00:00",
            "end_ts": "2026-07-31T18:41:27+00:00"
        },
        "searched_at": "2026-07-31T21:30:07.098905+00:00",
        "notes": "No Sentinel-1 scenes covering AOI and time window"
    }
}
Methodology: 2026.01.18
Loiter Strait of Gibraltar Surveillance Zone
Jul 31, 2026 15:04 UTC 75.0% ▼
  • Duration: 3h 46m
  • Radius: 1,027 meters
  • Data Points: 49 AIS positions
  • Centroid: 35.0073, 129.0509
  • Zone: Strait of Gibraltar Surveillance Zone
Show Raw Evidence JSON
{
    "radius_m": 1027.40000000000009094947017729282379150390625,
    "duration_minutes": 226.80000000000001136868377216160297393798828125,
    "points": 49,
    "centroid": {
        "lat": 35.0073469795918441604953841306269168853759765625,
        "lon": 129.050898944897909359497134573757648468017578125
    },
    "bbox": {
        "min_lat": 35.005591699999996535552782006561756134033203125,
        "min_lon": 129.04896999999999707142706029117107391357421875,
        "max_lat": 35.0097717000000017151251086033880710601806640625,
        "max_lon": 129.061761700000005248512024991214275360107421875
    },
    "zone_id": "discovered_001"
}
Methodology: 2026.01.18
Sts Strait of Gibraltar Surveillance Zone
Jul 31, 2026 14:48 UTC 95/100 ▼
Vessel A: MMSI 440709700 (MUSUNG) REPUBLIC OF KOREA
Vessel B: MMSI 440308690 (CHEONGHAE3HO) REPUBLIC OF KOREA
  • Minimum Distance: 7 meters
  • Average Distance: 16 meters
  • Duration: 3h 53m
  • Period: 2026-07-31T14:48:23+00:00 to 2026-07-31T18:41:27+00:00
  • Vessel A Avg Speed: 0.1 knots
  • Vessel B Avg Speed: 0.1 knots
  • Zone: Strait of Gibraltar Surveillance Zone

Confidence Analysis

Score: 95/100

High-confidence STS candidate. Two tankers (MUSUNG and CHEONGHAE3HO) maintained close proximity (min 7m, avg 16m) for 233 minutes. Both vessels were slow-moving (avg speeds 0.1 and 0.1 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Strait of Gibraltar Surveillance Zone, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness25/25Min distance 7m, avg 16m
Duration25/25Duration 233 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±5m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Strait of Gibraltar Surveillance Zone
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 440709700,
        "name": "MUSUNG",
        "flag": "REPUBLIC OF KOREA"
    },
    "vessel_b": {
        "mmsi": 440308690,
        "name": "CHEONGHAE3HO",
        "flag": "REPUBLIC OF KOREA"
    },
    "min_distance_m": 6.79999999999999982236431605997495353221893310546875,
    "avg_distance_m": 15.800000000000000710542735760100185871124267578125,
    "distance_consistency_m": 4.5999999999999996447286321199499070644378662109375,
    "duration_minutes": 233.099999999999994315658113919198513031005859375,
    "overlap_duration_s": 13984,
    "speed_a_avg": 0.059999999999999997779553950749686919152736663818359375,
    "speed_a_std": 0.08000000000000000166533453693773481063544750213623046875,
    "speed_b_avg": 0.11999999999999999555910790149937383830547332763671875,
    "speed_b_std": 0.059999999999999997779553950749686919152736663818359375,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.059999999999999997779553950749686919152736663818359375,
            "max_sog": 0.299999999999999988897769753748434595763683319091796875
        },
        "vessel_b": {
            "avg_sog": 0.11999999999999999555910790149937383830547332763671875,
            "max_sog": 0.299999999999999988897769753748434595763683319091796875
        }
    },
    "time_window": {
        "start": "2026-07-31T14:48:23+00:00",
        "end": "2026-07-31T18:41:27+00:00"
    },
    "points_count": {
        "vessel_a": 45,
        "vessel_b": 45
    },
    "zone_id": "discovered_001",
    "zone_name": "Strait of Gibraltar Surveillance Zone",
    "score": {
        "value": 95,
        "components": {
            "distance_tightness": {
                "score": 25,
                "max": 25,
                "detail": "Min distance 7m, avg 16m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 233 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: Strait of Gibraltar Surveillance Zone"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (MUSUNG and CHEONGHAE3HO) maintained close proximity (min 7m, avg 16m) for 233 minutes. Both vessels were slow-moving (avg speeds 0.1 and 0.1 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Strait of Gibraltar Surveillance Zone, a known STS activity area."
    }
}
Methodology: 2026.01.18
Loiter Strait of Gibraltar Surveillance Zone
Jul 31, 2026 14:29 UTC 75.0% ▼
  • Duration: 4h 21m
  • Radius: 1,002 meters
  • Data Points: 53 AIS positions
  • Centroid: 35.0075, 129.0511
  • Zone: Strait of Gibraltar Surveillance Zone
Show Raw Evidence JSON
{
    "radius_m": 1002.200000000000045474735088646411895751953125,
    "duration_minutes": 261.19999999999998863131622783839702606201171875,
    "points": 53,
    "centroid": {
        "lat": 35.00749233396228277115369564853608608245849609375,
        "lon": 129.05113745094337218688451685011386871337890625
    },
    "bbox": {
        "min_lat": 35.005591699999996535552782006561756134033203125,
        "min_lon": 129.04896999999999707142706029117107391357421875,
        "max_lat": 35.0125766999999967765688779763877391815185546875,
        "max_lon": 129.061761700000005248512024991214275360107421875
    },
    "zone_id": "discovered_001"
}
Methodology: 2026.01.18
Zone Dwell Strait of Gibraltar Surveillance Zone
Jul 31, 2026 14:01 UTC 80.0% ▼
  • Zone: Strait of Gibraltar Surveillance Zone
  • Duration: 5h 2m
  • Data Points: 58 AIS positions
  • Period: 2026-07-31T14:01:50+00:00 to 2026-07-31T19:04:06+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_001",
    "zone_name": "Strait of Gibraltar Surveillance Zone",
    "dwell_minutes": 302.30000000000001136868377216160297393798828125,
    "points_in_zone": 58,
    "first_point": {
        "ts": "2026-07-31T14:01:50+00:00",
        "lat": 35.01776170000000121262928587384521961212158203125,
        "lon": 129.034966700000012451710063032805919647216796875
    },
    "last_point": {
        "ts": "2026-07-31T19:04:06+00:00",
        "lat": 35.03002500000000196678229258395731449127197265625,
        "lon": 129.09457670000000462096068076789379119873046875
    }
}
Methodology: 2026.01.18
Zone Dwell Strait of Gibraltar Surveillance Zone
Jul 31, 2026 13:01 UTC 80.0% ▼
  • Zone: Strait of Gibraltar Surveillance Zone
  • Duration: 6h 2m
  • Data Points: 70 AIS positions
  • Period: 2026-07-31T13:01:29+00:00 to 2026-07-31T19:04:06+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_001",
    "zone_name": "Strait of Gibraltar Surveillance Zone",
    "dwell_minutes": 362.6000000000000227373675443232059478759765625,
    "points_in_zone": 70,
    "first_point": {
        "ts": "2026-07-31T13:01:29+00:00",
        "lat": 35.014420000000001209627953357994556427001953125,
        "lon": 129.03005170000000134677975438535213470458984375
    },
    "last_point": {
        "ts": "2026-07-31T19:04:06+00:00",
        "lat": 35.03002500000000196678229258395731449127197265625,
        "lon": 129.09457670000000462096068076789379119873046875
    }
}
Methodology: 2026.01.18
Zone Dwell Strait of Gibraltar Surveillance Zone
Jul 31, 2026 12:01 UTC 80.0% ▼
  • Zone: Strait of Gibraltar Surveillance Zone
  • Duration: 6h 34m
  • Data Points: 78 AIS positions
  • Period: 2026-07-31T12:30:05+00:00 to 2026-07-31T19:04:06+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_001",
    "zone_name": "Strait of Gibraltar Surveillance Zone",
    "dwell_minutes": 394,
    "points_in_zone": 78,
    "first_point": {
        "ts": "2026-07-31T12:30:05+00:00",
        "lat": 35.01904499999999842430042917840182781219482421875,
        "lon": 129.041100000000000136424205265939235687255859375
    },
    "last_point": {
        "ts": "2026-07-31T19:04:06+00:00",
        "lat": 35.03002500000000196678229258395731449127197265625,
        "lon": 129.09457670000000462096068076789379119873046875
    }
}
Methodology: 2026.01.18
Zone Dwell Strait of Gibraltar Surveillance Zone
Jul 31, 2026 11:00 UTC 80.0% ▼
  • Zone: Strait of Gibraltar Surveillance Zone
  • Duration: 6h 38m
  • Data Points: 77 AIS positions
  • Period: 2026-07-31T11:50:03+00:00 to 2026-07-31T18:28:12+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_001",
    "zone_name": "Strait of Gibraltar Surveillance Zone",
    "dwell_minutes": 398.1000000000000227373675443232059478759765625,
    "points_in_zone": 77,
    "first_point": {
        "ts": "2026-07-31T11:50:03+00:00",
        "lat": 35.02210000000000178488335222937166690826416015625,
        "lon": 129.048403299999989712887327186763286590576171875
    },
    "last_point": {
        "ts": "2026-07-31T18:28:12+00:00",
        "lat": 35.0069567000000034795448300428688526153564453125,
        "lon": 129.050346700000005739639163948595523834228515625
    }
}
Methodology: 2026.01.18
Loiter Strait of Gibraltar Surveillance Zone
Jul 31, 2026 11:00 UTC 75.0% ▼
  • Duration: 1h 53m
  • Radius: 798 meters
  • Data Points: 26 AIS positions
  • Centroid: 35.0206, 129.0456
  • Zone: Strait of Gibraltar Surveillance Zone
Show Raw Evidence JSON
{
    "radius_m": 798.3999999999999772626324556767940521240234375,
    "duration_minutes": 113.7000000000000028421709430404007434844970703125,
    "points": 26,
    "centroid": {
        "lat": 35.0206108923076868677526363171637058258056640625,
        "lon": 129.04560366153845052394899539649486541748046875
    },
    "bbox": {
        "min_lat": 35.01655329999999821666278876364231109619140625,
        "min_lon": 129.037364999999994097379385493695735931396484375,
        "max_lat": 35.0224017000000031885065254755318164825439453125,
        "max_lon": 129.0489016999999876134097576141357421875
    },
    "zone_id": "discovered_001"
}
Methodology: 2026.01.18
Zone Dwell Strait of Gibraltar Surveillance Zone
Jul 31, 2026 10:00 UTC 80.0% ▼
  • Zone: Strait of Gibraltar Surveillance Zone
  • Duration: 6h 36m
  • Data Points: 81 AIS positions
  • Period: 2026-07-31T10:32:02+00:00 to 2026-07-31T17:08:06+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_001",
    "zone_name": "Strait of Gibraltar Surveillance Zone",
    "dwell_minutes": 396.1000000000000227373675443232059478759765625,
    "points_in_zone": 81,
    "first_point": {
        "ts": "2026-07-31T10:32:02+00:00",
        "lat": 35.0210282999999975572791299782693386077880859375,
        "lon": 129.047921699999989186835591681301593780517578125
    },
    "last_point": {
        "ts": "2026-07-31T17:08:06+00:00",
        "lat": 35.0073967000000010330040822736918926239013671875,
        "lon": 129.0504349999999931242200545966625213623046875
    }
}
Methodology: 2026.01.18
Loiter Strait of Gibraltar Surveillance Zone
Jul 31, 2026 10:00 UTC 75.0% ▼
  • Duration: 2h 54m
  • Radius: 863 meters
  • Data Points: 37 AIS positions
  • Centroid: 35.0208, 129.0463
  • Zone: Strait of Gibraltar Surveillance Zone
Show Raw Evidence JSON
{
    "radius_m": 863.200000000000045474735088646411895751953125,
    "duration_minutes": 174,
    "points": 37,
    "centroid": {
        "lat": 35.0207529702702657914414885453879833221435546875,
        "lon": 129.046295767567613665960379876196384429931640625
    },
    "bbox": {
        "min_lat": 35.01655329999999821666278876364231109619140625,
        "min_lon": 129.037364999999994097379385493695735931396484375,
        "max_lat": 35.0224017000000031885065254755318164825439453125,
        "max_lon": 129.0489016999999876134097576141357421875
    },
    "zone_id": "discovered_001"
}
Methodology: 2026.01.18
Zone Dwell Strait of Gibraltar Surveillance Zone
Jul 31, 2026 09:03 UTC 80.0% ▼
  • Zone: Strait of Gibraltar Surveillance Zone
  • Duration: 6h 35m
  • Data Points: 74 AIS positions
  • Period: 2026-07-31T09:53:21+00:00 to 2026-07-31T16:29:05+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_001",
    "zone_name": "Strait of Gibraltar Surveillance Zone",
    "dwell_minutes": 395.69999999999998863131622783839702606201171875,
    "points_in_zone": 74,
    "first_point": {
        "ts": "2026-07-31T09:53:21+00:00",
        "lat": 35.0208233000000035417542676441371440887451171875,
        "lon": 129.04786500000000160071067512035369873046875
    },
    "last_point": {
        "ts": "2026-07-31T16:29:05+00:00",
        "lat": 35.00745669999999876154106459580361843109130859375,
        "lon": 129.050399999999996225596987642347812652587890625
    }
}
Methodology: 2026.01.18
Loiter Strait of Gibraltar Surveillance Zone
Jul 31, 2026 09:03 UTC 75.0% ▼
  • Duration: 3h 50m
  • Radius: 889 meters
  • Data Points: 46 AIS positions
  • Centroid: 35.0208, 129.0466
  • Zone: Strait of Gibraltar Surveillance Zone
Show Raw Evidence JSON
{
    "radius_m": 889.1000000000000227373675443232059478759765625,
    "duration_minutes": 230.69999999999998863131622783839702606201171875,
    "points": 46,
    "centroid": {
        "lat": 35.02075832826086099203166668303310871124267578125,
        "lon": 129.046594058695660578450770117342472076416015625
    },
    "bbox": {
        "min_lat": 35.01655329999999821666278876364231109619140625,
        "min_lon": 129.037364999999994097379385493695735931396484375,
        "max_lat": 35.0224017000000031885065254755318164825439453125,
        "max_lon": 129.0489016999999876134097576141357421875
    },
    "zone_id": "discovered_001"
}
Methodology: 2026.01.18
Zone Dwell Strait of Gibraltar Surveillance Zone
Jul 31, 2026 08:30 UTC 80.0% ▼
  • Zone: Strait of Gibraltar Surveillance Zone
  • Duration: 6h 32m
  • Data Points: 68 AIS positions
  • Period: 2026-07-31T08:50:21+00:00 to 2026-07-31T15:22:31+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_001",
    "zone_name": "Strait of Gibraltar Surveillance Zone",
    "dwell_minutes": 392.19999999999998863131622783839702606201171875,
    "points_in_zone": 68,
    "first_point": {
        "ts": "2026-07-31T08:50:21+00:00",
        "lat": 35.0208032999999971934812492690980434417724609375,
        "lon": 129.04775499999999510691850446164608001708984375
    },
    "last_point": {
        "ts": "2026-07-31T15:22:31+00:00",
        "lat": 35.00763169999999746551111456938087940216064453125,
        "lon": 129.050308300000011740849004127085208892822265625
    }
}
Methodology: 2026.01.18
Loiter Strait of Gibraltar Surveillance Zone
Jul 31, 2026 08:30 UTC 75.0% ▼
  • Duration: 4h 23m
  • Radius: 1,108 meters
  • Data Points: 51 AIS positions
  • Centroid: 35.0209, 129.0468
  • Zone: Strait of Gibraltar Surveillance Zone
Show Raw Evidence JSON
{
    "radius_m": 1108,
    "duration_minutes": 263.8999999999999772626324556767940521240234375,
    "points": 51,
    "centroid": {
        "lat": 35.02094760980391896509900107048451900482177734375,
        "lon": 129.046775033333375404254184104502201080322265625
    },
    "bbox": {
        "min_lat": 35.01655329999999821666278876364231109619140625,
        "min_lon": 129.037364999999994097379385493695735931396484375,
        "max_lat": 35.03015500000000059799276641570031642913818359375,
        "max_lon": 129.051478300000013632597983814775943756103515625
    },
    "zone_id": "discovered_001"
}
Methodology: 2026.01.18
Zone Dwell Strait of Gibraltar Surveillance Zone
Jul 26, 2026 14:12 UTC 80.0% ▼
  • Zone: Strait of Gibraltar Surveillance Zone
  • Duration: 1h 34m
  • Data Points: 29 AIS positions
  • Period: 2026-07-26T14:12:32+00:00 to 2026-07-26T15:47:12+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_001",
    "zone_name": "Strait of Gibraltar Surveillance Zone",
    "dwell_minutes": 94.7000000000000028421709430404007434844970703125,
    "points_in_zone": 29,
    "first_point": {
        "ts": "2026-07-26T14:12:32+00:00",
        "lat": 35.0298082999999991216100170277059078216552734375,
        "lon": 129.121161699999987604314810596406459808349609375
    },
    "last_point": {
        "ts": "2026-07-26T15:47:12+00:00",
        "lat": 34.87780169999999912988641881383955478668212890625,
        "lon": 128.9743783000000121319317258894443511962890625
    }
}
Methodology: 2026.01.18

Recent Position Data

Time (UTC) Lat Lon Speed Course Zone
Jul 31 19:04 35.0300 129.0946 9.4 kn 47.6° Strait of Gibraltar Surveillance Zone
Jul 31 19:00 35.0234 129.0859 9.7 kn 49.6° Strait of Gibraltar Surveillance Zone
Jul 31 18:57 35.0185 129.0789 9.6 kn 52.0° Strait of Gibraltar Surveillance Zone
Jul 31 18:54 35.0134 129.0702 9.2 kn 60.9° Strait of Gibraltar Surveillance Zone
Jul 31 18:51 35.0098 129.0618 8.8 kn 61.9° Strait of Gibraltar Surveillance Zone
Jul 31 18:50 35.0087 129.0591 8.8 kn 63.0° Strait of Gibraltar Surveillance Zone
Jul 31 18:49 35.0075 129.0564 8.8 kn 63.7° Strait of Gibraltar Surveillance Zone
Jul 31 18:47 35.0056 129.0516 7.7 kn 68.9° Strait of Gibraltar Surveillance Zone
Jul 31 18:43 35.0071 129.0490 5.2 kn 267.0° Strait of Gibraltar Surveillance Zone
Jul 31 18:41 35.0070 129.0503 0.1 kn 218.0° Strait of Gibraltar Surveillance Zone
Jul 31 18:37 35.0070 129.0504 0.0 kn 218.0° Strait of Gibraltar Surveillance Zone
Jul 31 18:33 35.0069 129.0503 0.0 kn 218.0° Strait of Gibraltar Surveillance Zone
Jul 31 18:28 35.0070 129.0503 0.0 kn 218.0° Strait of Gibraltar Surveillance Zone
Jul 31 18:26 35.0070 129.0503 0.0 kn 218.0° Strait of Gibraltar Surveillance Zone
Jul 31 18:21 35.0072 129.0504 0.0 kn 239.3° Strait of Gibraltar Surveillance Zone
Jul 31 18:13 35.0072 129.0503 0.0 kn 44.1° Strait of Gibraltar Surveillance Zone
Jul 31 18:10 35.0071 129.0503 0.0 kn 44.1° Strait of Gibraltar Surveillance Zone
Jul 31 18:08 35.0071 129.0503 0.0 kn 44.1° Strait of Gibraltar Surveillance Zone
Jul 31 18:04 35.0070 129.0504 0.0 kn 44.1° Strait of Gibraltar Surveillance Zone
Jul 31 18:01 35.0069 129.0503 0.0 kn 31.2° Strait of Gibraltar Surveillance Zone

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.