SGV FLOT

IMO 8033089

Vessel information

Vessel Name SGV FLOT
IMO Number 8033089
MMSI 273458830
Vessel Type Tanker
Flag 🇷🇺 Russia
Call Sign UBSB
Length 119 m
Beam 13 m

Detected Events (100)

Zone Dwell Southern Öresund Surveillance Zone
Sep 4, 2026 23:01 UTC 80.0% ▼
  • Zone: Southern Öresund Surveillance Zone
  • Duration: 1h 44m
  • Data Points: 27 AIS positions
  • Period: 2026-09-04T23:01:29+00:00 to 2026-09-05T00:45:37+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_007",
    "zone_name": "Southern \u00d6resund Surveillance Zone",
    "dwell_minutes": 104.099999999999994315658113919198513031005859375,
    "points_in_zone": 27,
    "first_point": {
        "ts": "2026-09-04T23:01:29+00:00",
        "lat": 59.5724833000000018046193872578442096710205078125,
        "lon": 22.935199999999998254907040973193943500518798828125
    },
    "last_point": {
        "ts": "2026-09-05T00:45:37+00:00",
        "lat": 59.5179499999999990222931955941021442413330078125,
        "lon": 22.5803666999999990139258443377912044525146484375
    }
}
Methodology: 2026.01.18
Zone Dwell Southern Öresund Surveillance Zone
Sep 4, 2026 22:02 UTC 80.0% ▼
  • Zone: Southern Öresund Surveillance Zone
  • Duration: 2h 43m
  • Data Points: 42 AIS positions
  • Period: 2026-09-04T22:02:08+00:00 to 2026-09-05T00:45:37+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_007",
    "zone_name": "Southern \u00d6resund Surveillance Zone",
    "dwell_minutes": 163.5,
    "points_in_zone": 42,
    "first_point": {
        "ts": "2026-09-04T22:02:08+00:00",
        "lat": 59.5997832999999985759131959639489650726318359375,
        "lon": 23.143950000000000244426701101474463939666748046875
    },
    "last_point": {
        "ts": "2026-09-05T00:45:37+00:00",
        "lat": 59.5179499999999990222931955941021442413330078125,
        "lon": 22.5803666999999990139258443377912044525146484375
    }
}
Methodology: 2026.01.18
Zone Dwell Southern Öresund Surveillance Zone
Sep 4, 2026 21:01 UTC 80.0% ▼
  • Zone: Southern Öresund Surveillance Zone
  • Duration: 3h 43m
  • Data Points: 68 AIS positions
  • Period: 2026-09-04T21:01:47+00:00 to 2026-09-05T00:45:37+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_007",
    "zone_name": "Southern \u00d6resund Surveillance Zone",
    "dwell_minutes": 223.80000000000001136868377216160297393798828125,
    "points_in_zone": 68,
    "first_point": {
        "ts": "2026-09-04T21:01:47+00:00",
        "lat": 59.62599999999999766941982670687139034271240234375,
        "lon": 23.354233300000000639329300611279904842376708984375
    },
    "last_point": {
        "ts": "2026-09-05T00:45:37+00:00",
        "lat": 59.5179499999999990222931955941021442413330078125,
        "lon": 22.5803666999999990139258443377912044525146484375
    }
}
Methodology: 2026.01.18
Zone Dwell Southern Öresund Surveillance Zone
Sep 4, 2026 20:08 UTC 80.0% ▼
  • Zone: Southern Öresund Surveillance Zone
  • Duration: 4h 37m
  • Data Points: 92 AIS positions
  • Period: 2026-09-04T20:08:37+00:00 to 2026-09-05T00:45:37+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_007",
    "zone_name": "Southern \u00d6resund Surveillance Zone",
    "dwell_minutes": 277,
    "points_in_zone": 92,
    "first_point": {
        "ts": "2026-09-04T20:08:37+00:00",
        "lat": 59.65251669999999961646608426235616207122802734375,
        "lon": 23.531433299999999775309333926998078823089599609375
    },
    "last_point": {
        "ts": "2026-09-05T00:45:37+00:00",
        "lat": 59.5179499999999990222931955941021442413330078125,
        "lon": 22.5803666999999990139258443377912044525146484375
    }
}
Methodology: 2026.01.18
Ais Gap🛰️✗ Northern Baltic Sea Surveillance Zone
Sep 4, 2026 14:34 UTC 70.0% ▼
  • Gap Duration: 5h 18m
  • Last Seen: 2026-09-04T14:34:07+00:00 at 59.8074, 24.6336 (Zone: Northern Baltic Sea Surveillance Zone)
  • Next Seen: 2026-09-04T19:52:27+00:00 at 59.6617, 23.5863

🛰️ 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: 2026-09-04T20:15:01.879285+00:00

Show Raw Evidence JSON
{
    "gap_minutes": 318.30000000000001136868377216160297393798828125,
    "last_seen": {
        "ts": "2026-09-04T14:34:07+00:00",
        "lat": 59.8074332999999995763573679141700267791748046875,
        "lon": 24.6336332999999996218321030028164386749267578125,
        "sog": 6,
        "zone_id": "discovered_216"
    },
    "next_seen": {
        "ts": "2026-09-04T19:52:27+00:00",
        "lat": 59.66173330000000163408913067542016506195068359375,
        "lon": 23.586283300000001617036105017177760601043701171875
    },
    "gap_enrichment": {
        "status": "not_found",
        "corridor": {
            "start": {
                "lat": 59.8074332999999995763573679141700267791748046875,
                "lon": 24.6336332999999996218321030028164386749267578125,
                "ts": "2026-09-04T14:34:07+00:00"
            },
            "end": {
                "lat": 59.66173330000000163408913067542016506195068359375,
                "lon": 23.586283300000001617036105017177760601043701171875,
                "ts": "2026-09-04T19:52:27+00:00"
            },
            "bbox": {
                "min_lat": 59.48155299999999812143869348801672458648681640625,
                "min_lon": 23.228787000000000517729858984239399433135986328125,
                "max_lat": 59.98761300000000318277670885436236858367919921875,
                "max_lon": 24.991129000000000814907252788543701171875
            },
            "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": "2026-09-04T20:15:01.879285+00:00"
    }
}
Methodology: 2026.01.18
Zone Dwell Northern Baltic Sea Surveillance Zone
Sep 4, 2026 13:13 UTC 80.0% ▼
  • Zone: Northern Baltic Sea Surveillance Zone
  • Duration: 1h 20m
  • Data Points: 25 AIS positions
  • Period: 2026-09-04T13:13:37+00:00 to 2026-09-04T14:34:07+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_216",
    "zone_name": "Northern Baltic Sea Surveillance Zone",
    "dwell_minutes": 80.5,
    "points_in_zone": 25,
    "first_point": {
        "ts": "2026-09-04T13:13:37+00:00",
        "lat": 59.8334832999999974845195538364350795745849609375,
        "lon": 24.90384999999999848796505830250680446624755859375
    },
    "last_point": {
        "ts": "2026-09-04T14:34:07+00:00",
        "lat": 59.8074332999999995763573679141700267791748046875,
        "lon": 24.6336332999999996218321030028164386749267578125
    }
}
Methodology: 2026.01.18
Zone Dwell Baltic Exit/Tallinn Approach
Sep 4, 2026 12:00 UTC 80.0% ▼
  • Zone: Baltic Exit/Tallinn Approach
  • Duration: 1h 41m
  • Data Points: 38 AIS positions
  • Period: 2026-09-04T12:00:58+00:00 to 2026-09-04T13:42:37+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_baltic_transit",
    "zone_name": "Baltic Exit\/Tallinn Approach",
    "dwell_minutes": 101.7000000000000028421709430404007434844970703125,
    "points_in_zone": 38,
    "first_point": {
        "ts": "2026-09-04T12:00:58+00:00",
        "lat": 59.85844999999999771489456179551780223846435546875,
        "lon": 25.154033299999998263274392229504883289337158203125
    },
    "last_point": {
        "ts": "2026-09-04T13:42:37+00:00",
        "lat": 59.82411669999999759284037281759083271026611328125,
        "lon": 24.80553330000000045174601837061345577239990234375
    }
}
Methodology: 2026.01.18
Zone Dwell Baltic Exit/Tallinn Approach
Sep 4, 2026 11:01 UTC 80.0% ▼
  • Zone: Baltic Exit/Tallinn Approach
  • Duration: 2h 41m
  • Data Points: 58 AIS positions
  • Period: 2026-09-04T11:01:06+00:00 to 2026-09-04T13:42:37+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_baltic_transit",
    "zone_name": "Baltic Exit\/Tallinn Approach",
    "dwell_minutes": 161.5,
    "points_in_zone": 58,
    "first_point": {
        "ts": "2026-09-04T11:01:06+00:00",
        "lat": 59.87703330000000079280653153546154499053955078125,
        "lon": 25.365866700000001543457983643747866153717041015625
    },
    "last_point": {
        "ts": "2026-09-04T13:42:37+00:00",
        "lat": 59.82411669999999759284037281759083271026611328125,
        "lon": 24.80553330000000045174601837061345577239990234375
    }
}
Methodology: 2026.01.18
Zone Dwell Baltic Exit/Tallinn Approach
Sep 4, 2026 10:01 UTC 80.0% ▼
  • Zone: Baltic Exit/Tallinn Approach
  • Duration: 3h 40m
  • Data Points: 77 AIS positions
  • Period: 2026-09-04T10:01:56+00:00 to 2026-09-04T13:42:37+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_baltic_transit",
    "zone_name": "Baltic Exit\/Tallinn Approach",
    "dwell_minutes": 220.69999999999998863131622783839702606201171875,
    "points_in_zone": 77,
    "first_point": {
        "ts": "2026-09-04T10:01:56+00:00",
        "lat": 59.89271670000000113986970973201096057891845703125,
        "lon": 25.578399999999998470912032644264400005340576171875
    },
    "last_point": {
        "ts": "2026-09-04T13:42:37+00:00",
        "lat": 59.82411669999999759284037281759083271026611328125,
        "lon": 24.80553330000000045174601837061345577239990234375
    }
}
Methodology: 2026.01.18
Zone Dwell Baltic Exit/Tallinn Approach
Sep 4, 2026 09:03 UTC 80.0% ▼
  • Zone: Baltic Exit/Tallinn Approach
  • Duration: 4h 39m
  • Data Points: 98 AIS positions
  • Period: 2026-09-04T09:03:07+00:00 to 2026-09-04T13:42:37+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_baltic_transit",
    "zone_name": "Baltic Exit\/Tallinn Approach",
    "dwell_minutes": 279.5,
    "points_in_zone": 98,
    "first_point": {
        "ts": "2026-09-04T09:03:07+00:00",
        "lat": 59.91751670000000018490027287043631076812744140625,
        "lon": 25.788316699999999315195964300073683261871337890625
    },
    "last_point": {
        "ts": "2026-09-04T13:42:37+00:00",
        "lat": 59.82411669999999759284037281759083271026611328125,
        "lon": 24.80553330000000045174601837061345577239990234375
    }
}
Methodology: 2026.01.18
Zone Dwell Baltic Exit/Tallinn Approach
Sep 4, 2026 08:15 UTC 80.0% ▼
  • Zone: Baltic Exit/Tallinn Approach
  • Duration: 5h 27m
  • Data Points: 116 AIS positions
  • Period: 2026-09-04T08:15:17+00:00 to 2026-09-04T13:42:37+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_baltic_transit",
    "zone_name": "Baltic Exit\/Tallinn Approach",
    "dwell_minutes": 327.30000000000001136868377216160297393798828125,
    "points_in_zone": 116,
    "first_point": {
        "ts": "2026-09-04T08:15:17+00:00",
        "lat": 59.93724999999999880628820392303168773651123046875,
        "lon": 25.94548329999999936035237624309957027435302734375
    },
    "last_point": {
        "ts": "2026-09-04T13:42:37+00:00",
        "lat": 59.82411669999999759284037281759083271026611328125,
        "lon": 24.80553330000000045174601837061345577239990234375
    }
}
Methodology: 2026.01.18
Zone Dwell Baltic Exit/Tallinn Approach
Sep 4, 2026 07:22 UTC 80.0% ▼
  • Zone: Baltic Exit/Tallinn Approach
  • Duration: 6h 19m
  • Data Points: 118 AIS positions
  • Period: 2026-09-04T07:22:46+00:00 to 2026-09-04T13:42:37+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_baltic_transit",
    "zone_name": "Baltic Exit\/Tallinn Approach",
    "dwell_minutes": 379.8999999999999772626324556767940521240234375,
    "points_in_zone": 118,
    "first_point": {
        "ts": "2026-09-04T07:22:46+00:00",
        "lat": 59.9611000000000018417267710901796817779541015625,
        "lon": 26.120200000000000528643795405514538288116455078125
    },
    "last_point": {
        "ts": "2026-09-04T13:42:37+00:00",
        "lat": 59.82411669999999759284037281759083271026611328125,
        "lon": 24.80553330000000045174601837061345577239990234375
    }
}
Methodology: 2026.01.18
Zone Dwell Ust-Luga/St. Petersburg Approach
Sep 1, 2026 13:01 UTC 80.0% ▼
  • Zone: Ust-Luga/St. Petersburg Approach
  • Duration: 1h 55m
  • Data Points: 17 AIS positions
  • Period: 2026-09-01T13:01:05+00:00 to 2026-09-01T14:56:14+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 115.2000000000000028421709430404007434844970703125,
    "points_in_zone": 17,
    "first_point": {
        "ts": "2026-09-01T13:01:05+00:00",
        "lat": 59.8768783000000013316821423359215259552001953125,
        "lon": 30.2181633000000005040419637225568294525146484375
    },
    "last_point": {
        "ts": "2026-09-01T14:56:14+00:00",
        "lat": 59.8779899999999969395503285340964794158935546875,
        "lon": 30.219474999999999198507794062606990337371826171875
    }
}
Methodology: 2026.01.18
Loiter Ust-Luga/St. Petersburg Approach
Sep 1, 2026 13:01 UTC 75.0% ▼
  • Duration: 1h 55m
  • Radius: 136 meters
  • Data Points: 17 AIS positions
  • Centroid: 59.8769, 30.2182
  • Zone: Ust-Luga/St. Petersburg Approach
Show Raw Evidence JSON
{
    "radius_m": 136,
    "duration_minutes": 115.2000000000000028421709430404007434844970703125,
    "points": 17,
    "centroid": {
        "lat": 59.876943329411773220272152684628963470458984375,
        "lon": 30.2182265647058869717511697672307491302490234375
    },
    "bbox": {
        "min_lat": 59.87686000000000063892002799548208713531494140625,
        "min_lon": 30.218108300000000809859557193703949451446533203125,
        "max_lat": 59.8779899999999969395503285340964794158935546875,
        "max_lon": 30.219474999999999198507794062606990337371826171875
    },
    "zone_id": "russia_ust_luga_approach"
}
Methodology: 2026.01.18
Zone Dwell Ust-Luga/St. Petersburg Approach
Sep 1, 2026 12:05 UTC 80.0% ▼
  • Zone: Ust-Luga/St. Petersburg Approach
  • Duration: 2h 50m
  • Data Points: 23 AIS positions
  • Period: 2026-09-01T12:05:43+00:00 to 2026-09-01T14:56:14+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 170.5,
    "points_in_zone": 23,
    "first_point": {
        "ts": "2026-09-01T12:05:43+00:00",
        "lat": 59.8768917000000016059857443906366825103759765625,
        "lon": 30.21811999999999898136593401432037353515625
    },
    "last_point": {
        "ts": "2026-09-01T14:56:14+00:00",
        "lat": 59.8779899999999969395503285340964794158935546875,
        "lon": 30.219474999999999198507794062606990337371826171875
    }
}
Methodology: 2026.01.18
Loiter Ust-Luga/St. Petersburg Approach
Sep 1, 2026 12:05 UTC 75.0% ▼
  • Duration: 2h 50m
  • Radius: 138 meters
  • Data Points: 23 AIS positions
  • Centroid: 59.8769, 30.2182
  • Zone: Ust-Luga/St. Petersburg Approach
Show Raw Evidence JSON
{
    "radius_m": 138,
    "duration_minutes": 170.5,
    "points": 23,
    "centroid": {
        "lat": 59.8769297086956413522784714587032794952392578125,
        "lon": 30.21820151739130011492306948639452457427978515625
    },
    "bbox": {
        "min_lat": 59.87686000000000063892002799548208713531494140625,
        "min_lon": 30.218108300000000809859557193703949451446533203125,
        "max_lat": 59.8779899999999969395503285340964794158935546875,
        "max_lon": 30.219474999999999198507794062606990337371826171875
    },
    "zone_id": "russia_ust_luga_approach"
}
Methodology: 2026.01.18
Zone Dwell Ust-Luga/St. Petersburg Approach
Sep 1, 2026 11:51 UTC 80.0% ▼
  • Zone: Ust-Luga/St. Petersburg Approach
  • Duration: 3h 4m
  • Data Points: 26 AIS positions
  • Period: 2026-09-01T11:51:44+00:00 to 2026-09-01T14:56:14+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 184.5,
    "points_in_zone": 26,
    "first_point": {
        "ts": "2026-09-01T11:51:44+00:00",
        "lat": 59.87687170000000236314008361659944057464599609375,
        "lon": 30.218129999999998602788764401338994503021240234375
    },
    "last_point": {
        "ts": "2026-09-01T14:56:14+00:00",
        "lat": 59.8779899999999969395503285340964794158935546875,
        "lon": 30.219474999999999198507794062606990337371826171875
    }
}
Methodology: 2026.01.18
Loiter Ust-Luga/St. Petersburg Approach
Sep 1, 2026 11:51 UTC 75.0% ▼
  • Duration: 3h 4m
  • Radius: 139 meters
  • Data Points: 26 AIS positions
  • Centroid: 59.8769, 30.2182
  • Zone: Ust-Luga/St. Petersburg Approach
Show Raw Evidence JSON
{
    "radius_m": 138.900000000000005684341886080801486968994140625,
    "duration_minutes": 184.5,
    "points": 26,
    "centroid": {
        "lat": 59.87692314230768175775665440596640110015869140625,
        "lon": 30.218193011538456715925349271856248378753662109375
    },
    "bbox": {
        "min_lat": 59.87686000000000063892002799548208713531494140625,
        "min_lon": 30.218108300000000809859557193703949451446533203125,
        "max_lat": 59.8779899999999969395503285340964794158935546875,
        "max_lon": 30.219474999999999198507794062606990337371826171875
    },
    "zone_id": "russia_ust_luga_approach"
}
Methodology: 2026.01.18
Zone Dwell Ust-Luga/St. Petersburg Approach
Sep 1, 2026 08:25 UTC 80.0% ▼
  • Zone: Ust-Luga/St. Petersburg Approach
  • Duration: 6h 30m
  • Data Points: 27 AIS positions
  • Period: 2026-09-01T08:25:25+00:00 to 2026-09-01T14:56:14+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 390.80000000000001136868377216160297393798828125,
    "points_in_zone": 27,
    "first_point": {
        "ts": "2026-09-01T08:25:25+00:00",
        "lat": 59.8768682999999981575456331484019756317138671875,
        "lon": 30.218095000000001704165697447024285793304443359375
    },
    "last_point": {
        "ts": "2026-09-01T14:56:14+00:00",
        "lat": 59.8779899999999969395503285340964794158935546875,
        "lon": 30.219474999999999198507794062606990337371826171875
    }
}
Methodology: 2026.01.18
Loiter Ust-Luga/St. Petersburg Approach
Sep 1, 2026 08:25 UTC 75.0% ▼
  • Duration: 6h 30m
  • Radius: 139 meters
  • Data Points: 27 AIS positions
  • Centroid: 59.8769, 30.2182
  • Zone: Ust-Luga/St. Petersburg Approach
Show Raw Evidence JSON
{
    "radius_m": 139.19999999999998863131622783839702606201171875,
    "duration_minutes": 390.80000000000001136868377216160297393798828125,
    "points": 27,
    "centroid": {
        "lat": 59.87692111111109483090331195853650569915771484375,
        "lon": 30.2181893814814799270607181824743747711181640625
    },
    "bbox": {
        "min_lat": 59.87686000000000063892002799548208713531494140625,
        "min_lon": 30.218095000000001704165697447024285793304443359375,
        "max_lat": 59.8779899999999969395503285340964794158935546875,
        "max_lon": 30.219474999999999198507794062606990337371826171875
    },
    "zone_id": "russia_ust_luga_approach"
}
Methodology: 2026.01.18
Zone Dwell Ust-Luga/St. Petersburg Approach
Aug 31, 2026 18:08 UTC 80.0% ▼
  • Zone: Ust-Luga/St. Petersburg Approach
  • Duration: 2h 31m
  • Data Points: 3 AIS positions
  • Period: 2026-08-31T18:08:01+00:00 to 2026-08-31T20:39:45+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 151.69999999999998863131622783839702606201171875,
    "points_in_zone": 3,
    "first_point": {
        "ts": "2026-08-31T18:08:01+00:00",
        "lat": 59.87691670000000243589965975843369960784912109375,
        "lon": 30.218083299999999979945641825906932353973388671875
    },
    "last_point": {
        "ts": "2026-08-31T20:39:45+00:00",
        "lat": 59.87693329999999747315087006427347660064697265625,
        "lon": 30.21809999999999973852027324028313159942626953125
    }
}
Methodology: 2026.01.18
Zone Dwell Ust-Luga/St. Petersburg Approach
Aug 31, 2026 17:49 UTC 80.0% ▼
  • Zone: Ust-Luga/St. Petersburg Approach
  • Duration: 2h 50m
  • Data Points: 6 AIS positions
  • Period: 2026-08-31T17:49:31+00:00 to 2026-08-31T20:39:45+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 170.19999999999998863131622783839702606201171875,
    "points_in_zone": 6,
    "first_point": {
        "ts": "2026-08-31T17:49:31+00:00",
        "lat": 59.87691670000000243589965975843369960784912109375,
        "lon": 30.218116699999999497094904654659330844879150390625
    },
    "last_point": {
        "ts": "2026-08-31T20:39:45+00:00",
        "lat": 59.87693329999999747315087006427347660064697265625,
        "lon": 30.21809999999999973852027324028313159942626953125
    }
}
Methodology: 2026.01.18
Zone Dwell Ust-Luga/St. Petersburg Approach
Aug 31, 2026 14:46 UTC 80.0% ▼
  • Zone: Ust-Luga/St. Petersburg Approach
  • Duration: 5h 53m
  • Data Points: 7 AIS positions
  • Period: 2026-08-31T14:46:10+00:00 to 2026-08-31T20:39:45+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 353.6000000000000227373675443232059478759765625,
    "points_in_zone": 7,
    "first_point": {
        "ts": "2026-08-31T14:46:10+00:00",
        "lat": 59.87689999999999912461134954355657100677490234375,
        "lon": 30.21809999999999973852027324028313159942626953125
    },
    "last_point": {
        "ts": "2026-08-31T20:39:45+00:00",
        "lat": 59.87693329999999747315087006427347660064697265625,
        "lon": 30.21809999999999973852027324028313159942626953125
    }
}
Methodology: 2026.01.18
Zone Dwell Ust-Luga/St. Petersburg Approach
Aug 31, 2026 13:14 UTC 80.0% ▼
  • Zone: Ust-Luga/St. Petersburg Approach
  • Duration: 4h 55m
  • Data Points: 9 AIS positions
  • Period: 2026-08-31T13:14:50+00:00 to 2026-08-31T18:10:24+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 295.6000000000000227373675443232059478759765625,
    "points_in_zone": 9,
    "first_point": {
        "ts": "2026-08-31T13:14:50+00:00",
        "lat": 59.87689999999999912461134954355657100677490234375,
        "lon": 30.21809999999999973852027324028313159942626953125
    },
    "last_point": {
        "ts": "2026-08-31T18:10:24+00:00",
        "lat": 59.87693329999999747315087006427347660064697265625,
        "lon": 30.218050000000001631406121305190026760101318359375
    }
}
Methodology: 2026.01.18
Zone Dwell Ust-Luga/St. Petersburg Approach
Aug 31, 2026 12:49 UTC 80.0% ▼
  • Zone: Ust-Luga/St. Petersburg Approach
  • Duration: 5h 21m
  • Data Points: 10 AIS positions
  • Period: 2026-08-31T12:49:20+00:00 to 2026-08-31T18:10:24+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 321.1000000000000227373675443232059478759765625,
    "points_in_zone": 10,
    "first_point": {
        "ts": "2026-08-31T12:49:20+00:00",
        "lat": 59.87686670000000077607182902283966541290283203125,
        "lon": 30.21809999999999973852027324028313159942626953125
    },
    "last_point": {
        "ts": "2026-08-31T18:10:24+00:00",
        "lat": 59.87693329999999747315087006427347660064697265625,
        "lon": 30.218050000000001631406121305190026760101318359375
    }
}
Methodology: 2026.01.18
Loiter Ust-Luga/St. Petersburg Approach
Aug 31, 2026 12:49 UTC 75.0% ▼
  • Duration: 5h 21m
  • Radius: 4 meters
  • Data Points: 10 AIS positions
  • Centroid: 59.8769, 30.2181
  • Zone: Ust-Luga/St. Petersburg Approach
Show Raw Evidence JSON
{
    "radius_m": 4.20000000000000017763568394002504646778106689453125,
    "duration_minutes": 321.1000000000000227373675443232059478759765625,
    "points": 10,
    "centroid": {
        "lat": 59.87690166999999519248376600444316864013671875,
        "lon": 30.21809166999999973768353811465203762054443359375
    },
    "bbox": {
        "min_lat": 59.87686670000000077607182902283966541290283203125,
        "min_lon": 30.218050000000001631406121305190026760101318359375,
        "max_lat": 59.87693329999999747315087006427347660064697265625,
        "max_lon": 30.218116699999999497094904654659330844879150390625
    },
    "zone_id": "russia_ust_luga_approach"
}
Methodology: 2026.01.18
Zone Dwell Ust-Luga/St. Petersburg Approach
Aug 31, 2026 11:02 UTC 80.0% ▼
  • Zone: Ust-Luga/St. Petersburg Approach
  • Duration: 6h 37m
  • Data Points: 9 AIS positions
  • Period: 2026-08-31T11:21:39+00:00 to 2026-08-31T17:59:01+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 397.3999999999999772626324556767940521240234375,
    "points_in_zone": 9,
    "first_point": {
        "ts": "2026-08-31T11:21:39+00:00",
        "lat": 59.876883300000002918750396929681301116943359375,
        "lon": 30.21809999999999973852027324028313159942626953125
    },
    "last_point": {
        "ts": "2026-08-31T17:59:01+00:00",
        "lat": 59.87689999999999912461134954355657100677490234375,
        "lon": 30.218083299999999979945641825906932353973388671875
    }
}
Methodology: 2026.01.18
Loiter Ust-Luga/St. Petersburg Approach
Aug 31, 2026 11:02 UTC 75.0% ▼
  • Duration: 3h 43m
  • Radius: 3 meters
  • Data Points: 10 AIS positions
  • Centroid: 59.8769, 30.2181
  • Zone: Ust-Luga/St. Petersburg Approach
Show Raw Evidence JSON
{
    "radius_m": 3.20000000000000017763568394002504646778106689453125,
    "duration_minutes": 223.19999999999998863131622783839702606201171875,
    "points": 10,
    "centroid": {
        "lat": 59.8768949999999904321157373487949371337890625,
        "lon": 30.21809667000000132475179270841181278228759765625
    },
    "bbox": {
        "min_lat": 59.87686670000000077607182902283966541290283203125,
        "min_lon": 30.21806670000000138998075271956622600555419921875,
        "max_lat": 59.87691670000000243589965975843369960784912109375,
        "max_lon": 30.218116699999999497094904654659330844879150390625
    },
    "zone_id": "russia_ust_luga_approach"
}
Methodology: 2026.01.18
Sts Ust-Luga/St. Petersburg Approach
Aug 31, 2026 10:17 UTC 58/100 ▼
Vessel A: MMSI 273353550 (EUROSTAR 4 MARIA) RUSSIA
Vessel B: IMO 8033089 (SGV FLOT) Russia
  • Minimum Distance: 285 meters
  • Average Distance: 322 meters
  • Duration: 43 minutes
  • Period: 2026-08-31T10:31:05+00:00 to 2026-08-31T11:14:34+00:00
  • Vessel A Avg Speed: 0.3 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Ust-Luga/St. Petersburg Approach

Confidence Analysis

Score: 58/100

Low-confidence STS candidate - may warrant review. Two tankers (EUROSTAR 4 MARIA and SGV FLOT) maintained close proximity (min 285m, avg 322m) for 44 minutes. Both vessels were slow-moving (avg speeds 0.3 and 0.0 knots). Moderate distance variation observed during the encounter. Event occurred in Ust-Luga/St. Petersburg Approach, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness15/25Min distance 285m, avg 322m
Duration5/25Duration 44 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency8/15Distance variance ±72m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Ust-Luga/St. Petersburg Approach
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273353550,
        "name": "EUROSTAR 4 MARIA",
        "flag": "RUSSIA"
    },
    "vessel_b": {
        "mmsi": 273458830,
        "imo": 8033089,
        "name": "SGV FLOT",
        "flag": "Russia"
    },
    "min_distance_m": 284.69999999999998863131622783839702606201171875,
    "avg_distance_m": 321.6000000000000227373675443232059478759765625,
    "distance_consistency_m": 72.099999999999994315658113919198513031005859375,
    "duration_minutes": 43.5,
    "overlap_duration_s": 2609,
    "speed_a_avg": 0.2800000000000000266453525910037569701671600341796875,
    "speed_a_std": 0.2200000000000000011102230246251565404236316680908203125,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.2800000000000000266453525910037569701671600341796875,
            "max_sog": 0.5
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-08-31T10:31:05+00:00",
        "end": "2026-08-31T11:14:34+00:00"
    },
    "points_count": {
        "vessel_a": 4,
        "vessel_b": 4
    },
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "score": {
        "value": 58,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 285m, avg 322m"
            },
            "duration": {
                "score": 5,
                "max": 25,
                "detail": "Duration 44 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 8,
                "max": 15,
                "detail": "Distance variance \u00b172m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Ust-Luga\/St. Petersburg Approach"
            }
        },
        "summary": "Low-confidence STS candidate - may warrant review. Two tankers (EUROSTAR 4 MARIA and SGV FLOT) maintained close proximity (min 285m, avg 322m) for 44 minutes. Both vessels were slow-moving (avg speeds 0.3 and 0.0 knots). Moderate distance variation observed during the encounter. Event occurred in Ust-Luga\/St. Petersburg Approach, a known STS activity area."
    }
}
Methodology: 2026.01.18
Zone Dwell Ust-Luga/St. Petersburg Approach
Aug 31, 2026 10:17 UTC 80.0% ▼
  • Zone: Ust-Luga/St. Petersburg Approach
  • Duration: 4h 29m
  • Data Points: 20 AIS positions
  • Period: 2026-08-31T10:17:09+00:00 to 2026-08-31T14:46:10+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 269,
    "points_in_zone": 20,
    "first_point": {
        "ts": "2026-08-31T10:17:09+00:00",
        "lat": 59.876883300000002918750396929681301116943359375,
        "lon": 30.218116699999999497094904654659330844879150390625
    },
    "last_point": {
        "ts": "2026-08-31T14:46:10+00:00",
        "lat": 59.87689999999999912461134954355657100677490234375,
        "lon": 30.21809999999999973852027324028313159942626953125
    }
}
Methodology: 2026.01.18
Loiter Ust-Luga/St. Petersburg Approach
Aug 31, 2026 10:17 UTC 75.0% ▼
  • Duration: 4h 29m
  • Radius: 3 meters
  • Data Points: 20 AIS positions
  • Centroid: 59.8769, 30.2181
  • Zone: Ust-Luga/St. Petersburg Approach
Show Raw Evidence JSON
{
    "radius_m": 3.20000000000000017763568394002504646778106689453125,
    "duration_minutes": 269,
    "points": 20,
    "centroid": {
        "lat": 59.8768949950000006765549187548458576202392578125,
        "lon": 30.21809499999999815145201864652335643768310546875
    },
    "bbox": {
        "min_lat": 59.87686670000000077607182902283966541290283203125,
        "min_lon": 30.21806670000000138998075271956622600555419921875,
        "max_lat": 59.87691670000000243589965975843369960784912109375,
        "max_lon": 30.218116699999999497094904654659330844879150390625
    },
    "zone_id": "russia_ust_luga_approach"
}
Methodology: 2026.01.18
Zone Dwell Ust-Luga/St. Petersburg Approach
Aug 31, 2026 09:00 UTC 80.0% ▼
  • Zone: Ust-Luga/St. Petersburg Approach
  • Duration: 5h 46m
  • Data Points: 32 AIS positions
  • Period: 2026-08-31T09:00:05+00:00 to 2026-08-31T14:46:10+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 346.1000000000000227373675443232059478759765625,
    "points_in_zone": 32,
    "first_point": {
        "ts": "2026-08-31T09:00:05+00:00",
        "lat": 59.876883300000002918750396929681301116943359375,
        "lon": 30.218116699999999497094904654659330844879150390625
    },
    "last_point": {
        "ts": "2026-08-31T14:46:10+00:00",
        "lat": 59.87689999999999912461134954355657100677490234375,
        "lon": 30.21809999999999973852027324028313159942626953125
    }
}
Methodology: 2026.01.18
Loiter Ust-Luga/St. Petersburg Approach
Aug 31, 2026 09:00 UTC 75.0% ▼
  • Duration: 5h 46m
  • Radius: 3 meters
  • Data Points: 32 AIS positions
  • Centroid: 59.8769, 30.2181
  • Zone: Ust-Luga/St. Petersburg Approach
Show Raw Evidence JSON
{
    "radius_m": 3.20000000000000017763568394002504646778106689453125,
    "duration_minutes": 346.1000000000000227373675443232059478759765625,
    "points": 32,
    "centroid": {
        "lat": 59.87689374374999573547029285691678524017333984375,
        "lon": 30.218100003125012875671018264256417751312255859375
    },
    "bbox": {
        "min_lat": 59.87686670000000077607182902283966541290283203125,
        "min_lon": 30.21806670000000138998075271956622600555419921875,
        "max_lat": 59.87691670000000243589965975843369960784912109375,
        "max_lon": 30.218133300000001639773472561500966548919677734375
    },
    "zone_id": "russia_ust_luga_approach"
}
Methodology: 2026.01.18
Sts🛰️✗ Ust-Luga/St. Petersburg Approach
Aug 31, 2026 08:28 UTC 85/100 ▼
Vessel A: Abrau (ABRAU) RUSSIA
Vessel B: IMO 8033089 (SGV FLOT) Russia
  • Minimum Distance: 121 meters
  • Average Distance: 123 meters
  • Duration: 1h 30m
  • Period: 2026-08-31T08:28:46+00:00 to 2026-08-31T09:59:36+00:00
  • Vessel A Avg Speed: 0.1 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Ust-Luga/St. Petersburg Approach

Confidence Analysis

Score: 85/100

High-confidence STS candidate. Two tankers (ABRAU and SGV FLOT) maintained close proximity (min 121m, avg 123m) for 91 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 Ust-Luga/St. Petersburg Approach, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness20/25Min distance 121m, avg 123m
Duration20/25Duration 91 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±2m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Ust-Luga/St. Petersburg Approach

🛰️ Satellite Corroboration

✗ SAR Not Available

No satellite imagery for this time/location

No Sentinel-1 scenes covering AOI and time window

Searched: 2026-08-31T13:30:01.460286+00:00

Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273368990,
        "imo": 9422964,
        "name": "ABRAU",
        "flag": "RUSSIA"
    },
    "vessel_b": {
        "mmsi": 273458830,
        "imo": 8033089,
        "name": "SGV FLOT",
        "flag": "Russia"
    },
    "min_distance_m": 121.2000000000000028421709430404007434844970703125,
    "avg_distance_m": 123.2000000000000028421709430404007434844970703125,
    "distance_consistency_m": 1.8000000000000000444089209850062616169452667236328125,
    "duration_minutes": 90.7999999999999971578290569595992565155029296875,
    "overlap_duration_s": 5450,
    "speed_a_avg": 0.1000000000000000055511151231257827021181583404541015625,
    "speed_a_std": 0.08000000000000000166533453693773481063544750213623046875,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.1000000000000000055511151231257827021181583404541015625,
            "max_sog": 0.200000000000000011102230246251565404236316680908203125
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-08-31T08:28:46+00:00",
        "end": "2026-08-31T09:59:36+00:00"
    },
    "points_count": {
        "vessel_a": 4,
        "vessel_b": 4
    },
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "score": {
        "value": 85,
        "components": {
            "distance_tightness": {
                "score": 20,
                "max": 25,
                "detail": "Min distance 121m, avg 123m"
            },
            "duration": {
                "score": 20,
                "max": 25,
                "detail": "Duration 91 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: Ust-Luga\/St. Petersburg Approach"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (ABRAU and SGV FLOT) maintained close proximity (min 121m, avg 123m) for 91 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 Ust-Luga\/St. Petersburg Approach, a known STS activity area."
    },
    "sar": {
        "status": "not_found",
        "centroid": {
            "lat": 59.87685019999999980200300342403352260589599609375,
            "lon": 30.219193300000000590443960390985012054443359375
        },
        "time_window": {
            "start_ts": "2026-08-31T08:28:46+00:00",
            "end_ts": "2026-08-31T09:59:36+00:00"
        },
        "searched_at": "2026-08-31T13:30:01.460286+00:00",
        "notes": "No Sentinel-1 scenes covering AOI and time window"
    }
}
Methodology: 2026.01.18
Zone Dwell Ust-Luga/St. Petersburg Approach
Aug 31, 2026 08:28 UTC 80.0% ▼
  • Zone: Ust-Luga/St. Petersburg Approach
  • Duration: 6h 18m
  • Data Points: 38 AIS positions
  • Period: 2026-08-31T08:28:06+00:00 to 2026-08-31T14:46:10+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 378.1000000000000227373675443232059478759765625,
    "points_in_zone": 38,
    "first_point": {
        "ts": "2026-08-31T08:28:06+00:00",
        "lat": 59.87689999999999912461134954355657100677490234375,
        "lon": 30.21809999999999973852027324028313159942626953125
    },
    "last_point": {
        "ts": "2026-08-31T14:46:10+00:00",
        "lat": 59.87689999999999912461134954355657100677490234375,
        "lon": 30.21809999999999973852027324028313159942626953125
    }
}
Methodology: 2026.01.18
Loiter Ust-Luga/St. Petersburg Approach
Aug 31, 2026 08:28 UTC 75.0% ▼
  • Duration: 6h 18m
  • Radius: 3 meters
  • Data Points: 38 AIS positions
  • Centroid: 59.8769, 30.2181
  • Zone: Ust-Luga/St. Petersburg Approach
Show Raw Evidence JSON
{
    "radius_m": 3.20000000000000017763568394002504646778106689453125,
    "duration_minutes": 378.1000000000000227373675443232059478759765625,
    "points": 38,
    "centroid": {
        "lat": 59.87689429210526981250950484536588191986083984375,
        "lon": 30.21810044210527479435768327675759792327880859375
    },
    "bbox": {
        "min_lat": 59.87686670000000077607182902283966541290283203125,
        "min_lon": 30.21806670000000138998075271956622600555419921875,
        "max_lat": 59.87691670000000243589965975843369960784912109375,
        "max_lon": 30.218133300000001639773472561500966548919677734375
    },
    "zone_id": "russia_ust_luga_approach"
}
Methodology: 2026.01.18
Zone Dwell Ust-Luga/St. Petersburg Approach
Aug 31, 2026 07:28 UTC 80.0% ▼
  • Zone: Ust-Luga/St. Petersburg Approach
  • Duration: 6h 17m
  • Data Points: 38 AIS positions
  • Period: 2026-08-31T07:28:41+00:00 to 2026-08-31T13:46:31+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 377.80000000000001136868377216160297393798828125,
    "points_in_zone": 38,
    "first_point": {
        "ts": "2026-08-31T07:28:41+00:00",
        "lat": 59.87691670000000243589965975843369960784912109375,
        "lon": 30.218083299999999979945641825906932353973388671875
    },
    "last_point": {
        "ts": "2026-08-31T13:46:31+00:00",
        "lat": 59.87689999999999912461134954355657100677490234375,
        "lon": 30.21809999999999973852027324028313159942626953125
    }
}
Methodology: 2026.01.18
Loiter Ust-Luga/St. Petersburg Approach
Aug 31, 2026 07:28 UTC 75.0% ▼
  • Duration: 6h 17m
  • Radius: 3 meters
  • Data Points: 38 AIS positions
  • Centroid: 59.8769, 30.2181
  • Zone: Ust-Luga/St. Petersburg Approach
Show Raw Evidence JSON
{
    "radius_m": 3.29999999999999982236431605997495353221893310546875,
    "duration_minutes": 377.80000000000001136868377216160297393798828125,
    "points": 38,
    "centroid": {
        "lat": 59.87689473157894326504901982843875885009765625,
        "lon": 30.21810000263159423639081069268286228179931640625
    },
    "bbox": {
        "min_lat": 59.87686670000000077607182902283966541290283203125,
        "min_lon": 30.21806670000000138998075271956622600555419921875,
        "max_lat": 59.87691670000000243589965975843369960784912109375,
        "max_lon": 30.218133300000001639773472561500966548919677734375
    },
    "zone_id": "russia_ust_luga_approach"
}
Methodology: 2026.01.18
Sts🛰️✗ Ust-Luga/St. Petersburg Approach
Aug 31, 2026 06:34 UTC 90/100 ▼
Vessel A: Abrau (ABRAU) RUSSIA
Vessel B: IMO 8033089 (SGV FLOT) Russia
  • Minimum Distance: 121 meters
  • Average Distance: 123 meters
  • Duration: 3h 24m
  • Period: 2026-08-31T06:34:57+00:00 to 2026-08-31T09:59:36+00:00
  • Vessel A Avg Speed: 0.1 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Ust-Luga/St. Petersburg Approach

Confidence Analysis

Score: 90/100

High-confidence STS candidate. Two tankers (ABRAU and SGV FLOT) maintained close proximity (min 121m, avg 123m) for 205 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 Ust-Luga/St. Petersburg Approach, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness20/25Min distance 121m, avg 123m
Duration25/25Duration 205 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±2m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Ust-Luga/St. Petersburg Approach

🛰️ Satellite Corroboration

✗ SAR Not Available

No satellite imagery for this time/location

No Sentinel-1 scenes covering AOI and time window

Searched: 2026-08-31T13:15:07.402238+00:00

Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273368990,
        "imo": 9422964,
        "name": "ABRAU",
        "flag": "RUSSIA"
    },
    "vessel_b": {
        "mmsi": 273458830,
        "imo": 8033089,
        "name": "SGV FLOT",
        "flag": "Russia"
    },
    "min_distance_m": 120.7000000000000028421709430404007434844970703125,
    "avg_distance_m": 122.7999999999999971578290569595992565155029296875,
    "distance_consistency_m": 1.600000000000000088817841970012523233890533447265625,
    "duration_minutes": 204.69999999999998863131622783839702606201171875,
    "overlap_duration_s": 12279,
    "speed_a_avg": 0.1000000000000000055511151231257827021181583404541015625,
    "speed_a_std": 0.08000000000000000166533453693773481063544750213623046875,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.1000000000000000055511151231257827021181583404541015625,
            "max_sog": 0.200000000000000011102230246251565404236316680908203125
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-08-31T06:34:57+00:00",
        "end": "2026-08-31T09:59:36+00:00"
    },
    "points_count": {
        "vessel_a": 7,
        "vessel_b": 7
    },
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "score": {
        "value": 90,
        "components": {
            "distance_tightness": {
                "score": 20,
                "max": 25,
                "detail": "Min distance 121m, avg 123m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 205 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: Ust-Luga\/St. Petersburg Approach"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (ABRAU and SGV FLOT) maintained close proximity (min 121m, avg 123m) for 205 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 Ust-Luga\/St. Petersburg Approach, a known STS activity area."
    },
    "sar": {
        "status": "not_found",
        "centroid": {
            "lat": 59.8768625000000014324541552923619747161865234375,
            "lon": 30.21919199999999960937202558852732181549072265625
        },
        "time_window": {
            "start_ts": "2026-08-31T06:34:57+00:00",
            "end_ts": "2026-08-31T09:59:36+00:00"
        },
        "searched_at": "2026-08-31T13:15:07.402238+00:00",
        "notes": "No Sentinel-1 scenes covering AOI and time window"
    }
}
Methodology: 2026.01.18
Sts🛰️✗ Ust-Luga/St. Petersburg Approach
Aug 31, 2026 06:13 UTC 82/100 ▼
Vessel A: MMSI 273353550 (EUROSTAR 4 MARIA) RUSSIA
Vessel B: IMO 8033089 (SGV FLOT) Russia
  • Minimum Distance: 280 meters
  • Average Distance: 300 meters
  • Duration: 5 hours
  • Period: 2026-08-31T06:13:45+00:00 to 2026-08-31T11:14:34+00:00
  • Vessel A Avg Speed: 0.4 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Ust-Luga/St. Petersburg Approach

Confidence Analysis

Score: 82/100

High-confidence STS candidate. Two tankers (EUROSTAR 4 MARIA and SGV FLOT) maintained close proximity (min 280m, avg 300m) for 301 minutes. Both vessels were slow-moving (avg speeds 0.4 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Ust-Luga/St. Petersburg Approach, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness15/25Min distance 280m, avg 300m
Duration25/25Duration 301 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency12/15Distance variance ±49m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Ust-Luga/St. Petersburg Approach

🛰️ Satellite Corroboration

✗ SAR Not Available

No satellite imagery for this time/location

No Sentinel-1 scenes covering AOI and time window

Searched: 2026-08-31T12:15:02.065609+00:00

Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273353550,
        "name": "EUROSTAR 4 MARIA",
        "flag": "RUSSIA"
    },
    "vessel_b": {
        "mmsi": 273458830,
        "imo": 8033089,
        "name": "SGV FLOT",
        "flag": "Russia"
    },
    "min_distance_m": 280.19999999999998863131622783839702606201171875,
    "avg_distance_m": 300.30000000000001136868377216160297393798828125,
    "distance_consistency_m": 48.60000000000000142108547152020037174224853515625,
    "duration_minutes": 300.80000000000001136868377216160297393798828125,
    "overlap_duration_s": 18049,
    "speed_a_avg": 0.39000000000000001332267629550187848508358001708984375,
    "speed_a_std": 0.25,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.39000000000000001332267629550187848508358001708984375,
            "max_sog": 0.8000000000000000444089209850062616169452667236328125
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-08-31T06:13:45+00:00",
        "end": "2026-08-31T11:14:34+00:00"
    },
    "points_count": {
        "vessel_a": 9,
        "vessel_b": 9
    },
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "score": {
        "value": 82,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 280m, avg 300m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 301 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 12,
                "max": 15,
                "detail": "Distance variance \u00b149m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Ust-Luga\/St. Petersburg Approach"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (EUROSTAR 4 MARIA and SGV FLOT) maintained close proximity (min 280m, avg 300m) for 301 minutes. Both vessels were slow-moving (avg speeds 0.4 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Ust-Luga\/St. Petersburg Approach, a known STS activity area."
    },
    "sar": {
        "status": "not_found",
        "centroid": {
            "lat": 59.87702949999999901820046943612396717071533203125,
            "lon": 30.220162800000000657973941997624933719635009765625
        },
        "time_window": {
            "start_ts": "2026-08-31T06:13:45+00:00",
            "end_ts": "2026-08-31T11:14:34+00:00"
        },
        "searched_at": "2026-08-31T12:15:02.065609+00:00",
        "notes": "No Sentinel-1 scenes covering AOI and time window"
    }
}
Methodology: 2026.01.18
Zone Dwell Ust-Luga/St. Petersburg Approach
Aug 31, 2026 06:12 UTC 80.0% ▼
  • Zone: Ust-Luga/St. Petersburg Approach
  • Duration: 6h 33m
  • Data Points: 39 AIS positions
  • Period: 2026-08-31T06:52:52+00:00 to 2026-08-31T13:26:41+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 393.80000000000001136868377216160297393798828125,
    "points_in_zone": 39,
    "first_point": {
        "ts": "2026-08-31T06:52:52+00:00",
        "lat": 59.87689999999999912461134954355657100677490234375,
        "lon": 30.218083299999999979945641825906932353973388671875
    },
    "last_point": {
        "ts": "2026-08-31T13:26:41+00:00",
        "lat": 59.876883300000002918750396929681301116943359375,
        "lon": 30.218116699999999497094904654659330844879150390625
    }
}
Methodology: 2026.01.18
Loiter Ust-Luga/St. Petersburg Approach
Aug 31, 2026 06:12 UTC 75.0% ▼
  • Duration: 6h 33m
  • Radius: 3 meters
  • Data Points: 39 AIS positions
  • Centroid: 59.8769, 30.2181
  • Zone: Ust-Luga/St. Petersburg Approach
Show Raw Evidence JSON
{
    "radius_m": 3.29999999999999982236431605997495353221893310546875,
    "duration_minutes": 393.80000000000001136868377216160297393798828125,
    "points": 39,
    "centroid": {
        "lat": 59.87689529487177964028887799941003322601318359375,
        "lon": 30.218100428205143970217250171117484569549560546875
    },
    "bbox": {
        "min_lat": 59.87686670000000077607182902283966541290283203125,
        "min_lon": 30.21806670000000138998075271956622600555419921875,
        "max_lat": 59.87691670000000243589965975843369960784912109375,
        "max_lon": 30.218133300000001639773472561500966548919677734375
    },
    "zone_id": "russia_ust_luga_approach"
}
Methodology: 2026.01.18
Sts🛰️✗ Ust-Luga/St. Petersburg Approach
Aug 31, 2026 05:20 UTC 79/100 ▼
Vessel A: MMSI 273353550 (EUROSTAR 4 MARIA) RUSSIA
Vessel B: IMO 8033089 (SGV FLOT) Russia
  • Minimum Distance: 280 meters
  • Average Distance: 301 meters
  • Duration: 5h 54m
  • Period: 2026-08-31T05:20:05+00:00 to 2026-08-31T11:14:34+00:00
  • Vessel A Avg Speed: 0.4 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Ust-Luga/St. Petersburg Approach

Confidence Analysis

Score: 79/100

Moderate-confidence STS candidate. Two tankers (EUROSTAR 4 MARIA and SGV FLOT) maintained close proximity (min 280m, avg 301m) for 354 minutes. Both vessels were slow-moving (avg speeds 0.4 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Ust-Luga/St. Petersburg Approach, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness15/25Min distance 280m, avg 301m
Duration25/25Duration 354 minutes
Speed Stability17/20both nearly stationary; stable speeds
Distance Consistency12/15Distance variance ±39m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Ust-Luga/St. Petersburg Approach

🛰️ Satellite Corroboration

✗ SAR Not Available

No satellite imagery for this time/location

No Sentinel-1 scenes covering AOI and time window

Searched: 2026-08-31T11:30:01.914111+00:00

Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273353550,
        "name": "EUROSTAR 4 MARIA",
        "flag": "RUSSIA"
    },
    "vessel_b": {
        "mmsi": 273458830,
        "imo": 8033089,
        "name": "SGV FLOT",
        "flag": "Russia"
    },
    "min_distance_m": 280.19999999999998863131622783839702606201171875,
    "avg_distance_m": 300.69999999999998863131622783839702606201171875,
    "distance_consistency_m": 39.2999999999999971578290569595992565155029296875,
    "duration_minutes": 354.5,
    "overlap_duration_s": 21269,
    "speed_a_avg": 0.440000000000000002220446049250313080847263336181640625,
    "speed_a_std": 0.35999999999999998667732370449812151491641998291015625,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.440000000000000002220446049250313080847263336181640625,
            "max_sog": 1.399999999999999911182158029987476766109466552734375
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-08-31T05:20:05+00:00",
        "end": "2026-08-31T11:14:34+00:00"
    },
    "points_count": {
        "vessel_a": 16,
        "vessel_b": 16
    },
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "score": {
        "value": 79,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 280m, avg 301m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 354 minutes"
            },
            "speed_stability": {
                "score": 17,
                "max": 20,
                "detail": "both nearly stationary; stable speeds"
            },
            "distance_consistency": {
                "score": 12,
                "max": 15,
                "detail": "Distance variance \u00b139m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Ust-Luga\/St. Petersburg Approach"
            }
        },
        "summary": "Moderate-confidence STS candidate. Two tankers (EUROSTAR 4 MARIA and SGV FLOT) maintained close proximity (min 280m, avg 301m) for 354 minutes. Both vessels were slow-moving (avg speeds 0.4 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Ust-Luga\/St. Petersburg Approach, a known STS activity area."
    },
    "sar": {
        "status": "not_found",
        "centroid": {
            "lat": 59.8770130999999992127413861453533172607421875,
            "lon": 30.22040679999999923666109680198132991790771484375
        },
        "time_window": {
            "start_ts": "2026-08-31T05:20:05+00:00",
            "end_ts": "2026-08-31T11:14:34+00:00"
        },
        "searched_at": "2026-08-31T11:30:01.914111+00:00",
        "notes": "No Sentinel-1 scenes covering AOI and time window"
    }
}
Methodology: 2026.01.18
Zone Dwell Ust-Luga/St. Petersburg Approach
Aug 31, 2026 05:10 UTC 80.0% ▼
  • Zone: Ust-Luga/St. Petersburg Approach
  • Duration: 6h 10m
  • Data Points: 52 AIS positions
  • Period: 2026-08-31T05:10:46+00:00 to 2026-08-31T11:21:39+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 370.8999999999999772626324556767940521240234375,
    "points_in_zone": 52,
    "first_point": {
        "ts": "2026-08-31T05:10:46+00:00",
        "lat": 59.876883300000002918750396929681301116943359375,
        "lon": 30.21809999999999973852027324028313159942626953125
    },
    "last_point": {
        "ts": "2026-08-31T11:21:39+00:00",
        "lat": 59.876883300000002918750396929681301116943359375,
        "lon": 30.21809999999999973852027324028313159942626953125
    }
}
Methodology: 2026.01.18
Loiter Ust-Luga/St. Petersburg Approach
Aug 31, 2026 05:10 UTC 75.0% ▼
  • Duration: 6h 10m
  • Radius: 5 meters
  • Data Points: 52 AIS positions
  • Centroid: 59.8769, 30.2181
  • Zone: Ust-Luga/St. Petersburg Approach
Show Raw Evidence JSON
{
    "radius_m": 4.5,
    "duration_minutes": 370.8999999999999772626324556767940521240234375,
    "points": 52,
    "centroid": {
        "lat": 59.87689647115386293307892628945410251617431640625,
        "lon": 30.2180990365384758433719980530440807342529296875
    },
    "bbox": {
        "min_lat": 59.87686670000000077607182902283966541290283203125,
        "min_lon": 30.21806670000000138998075271956622600555419921875,
        "max_lat": 59.87693329999999747315087006427347660064697265625,
        "max_lon": 30.218133300000001639773472561500966548919677734375
    },
    "zone_id": "russia_ust_luga_approach"
}
Methodology: 2026.01.18
Sts Ust-Luga/St. Petersburg Approach
Aug 31, 2026 04:34 UTC 82/100 ▼
Vessel A: MMSI 273353550 (EUROSTAR 4 MARIA) RUSSIA
Vessel B: IMO 8033089 (SGV FLOT) Russia
  • Minimum Distance: 280 meters
  • Average Distance: 293 meters
  • Duration: 5h 46m
  • Period: 2026-08-31T04:39:06+00:00 to 2026-08-31T10:25:44+00:00
  • Vessel A Avg Speed: 0.5 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Ust-Luga/St. Petersburg Approach

Confidence Analysis

Score: 82/100

High-confidence STS candidate. Two tankers (EUROSTAR 4 MARIA and SGV FLOT) maintained close proximity (min 280m, avg 293m) for 347 minutes. Both vessels were slow-moving (avg speeds 0.5 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Ust-Luga/St. Petersburg Approach, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness15/25Min distance 280m, avg 293m
Duration25/25Duration 347 minutes
Speed Stability17/20both nearly stationary; stable speeds
Distance Consistency15/15Distance variance ±20m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Ust-Luga/St. Petersburg Approach
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273353550,
        "name": "EUROSTAR 4 MARIA",
        "flag": "RUSSIA"
    },
    "vessel_b": {
        "mmsi": 273458830,
        "imo": 8033089,
        "name": "SGV FLOT",
        "flag": "Russia"
    },
    "min_distance_m": 280.19999999999998863131622783839702606201171875,
    "avg_distance_m": 292.80000000000001136868377216160297393798828125,
    "distance_consistency_m": 20.300000000000000710542735760100185871124267578125,
    "duration_minutes": 346.6000000000000227373675443232059478759765625,
    "overlap_duration_s": 20798,
    "speed_a_avg": 0.4899999999999999911182158029987476766109466552734375,
    "speed_a_std": 0.38000000000000000444089209850062616169452667236328125,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.4899999999999999911182158029987476766109466552734375,
            "max_sog": 1.399999999999999911182158029987476766109466552734375
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-08-31T04:39:06+00:00",
        "end": "2026-08-31T10:25:44+00:00"
    },
    "points_count": {
        "vessel_a": 14,
        "vessel_b": 14
    },
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "score": {
        "value": 82,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 280m, avg 293m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 347 minutes"
            },
            "speed_stability": {
                "score": 17,
                "max": 20,
                "detail": "both nearly stationary; stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b120m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Ust-Luga\/St. Petersburg Approach"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (EUROSTAR 4 MARIA and SGV FLOT) maintained close proximity (min 280m, avg 293m) for 347 minutes. Both vessels were slow-moving (avg speeds 0.5 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Ust-Luga\/St. Petersburg Approach, a known STS activity area."
    }
}
Methodology: 2026.01.18
Zone Dwell Ust-Luga/St. Petersburg Approach
Aug 31, 2026 04:04 UTC 80.0% ▼
  • Zone: Ust-Luga/St. Petersburg Approach
  • Duration: 6h 30m
  • Data Points: 52 AIS positions
  • Period: 2026-08-31T04:47:25+00:00 to 2026-08-31T11:17:29+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 390.1000000000000227373675443232059478759765625,
    "points_in_zone": 52,
    "first_point": {
        "ts": "2026-08-31T04:47:25+00:00",
        "lat": 59.87691670000000243589965975843369960784912109375,
        "lon": 30.218083299999999979945641825906932353973388671875
    },
    "last_point": {
        "ts": "2026-08-31T11:17:29+00:00",
        "lat": 59.87689999999999912461134954355657100677490234375,
        "lon": 30.21809999999999973852027324028313159942626953125
    }
}
Methodology: 2026.01.18
Loiter Ust-Luga/St. Petersburg Approach
Aug 31, 2026 04:04 UTC 75.0% ▼
  • Duration: 6h 30m
  • Radius: 5 meters
  • Data Points: 52 AIS positions
  • Centroid: 59.8769, 30.2181
  • Zone: Ust-Luga/St. Petersburg Approach
Show Raw Evidence JSON
{
    "radius_m": 4.5,
    "duration_minutes": 390.1000000000000227373675443232059478759765625,
    "points": 52,
    "centroid": {
        "lat": 59.87689711346155974069915828295052051544189453125,
        "lon": 30.218098715384630992275560856796801090240478515625
    },
    "bbox": {
        "min_lat": 59.87686670000000077607182902283966541290283203125,
        "min_lon": 30.21806670000000138998075271956622600555419921875,
        "max_lat": 59.87693329999999747315087006427347660064697265625,
        "max_lon": 30.218133300000001639773472561500966548919677734375
    },
    "zone_id": "russia_ust_luga_approach"
}
Methodology: 2026.01.18
Sts🛰️? Ust-Luga/St. Petersburg Approach
Aug 31, 2026 03:08 UTC 82/100 ▼
Vessel A: MMSI 273353550 (EUROSTAR 4 MARIA) RUSSIA
Vessel B: IMO 8033089 (SGV FLOT) Russia
  • Minimum Distance: 280 meters
  • Average Distance: 291 meters
  • Duration: 3h 48m
  • Period: 2026-08-31T03:09:27+00:00 to 2026-08-31T06:57:45+00:00
  • Vessel A Avg Speed: 0.4 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Ust-Luga/St. Petersburg Approach

Confidence Analysis

Score: 82/100

High-confidence STS candidate. Two tankers (EUROSTAR 4 MARIA and SGV FLOT) maintained close proximity (min 280m, avg 291m) for 228 minutes. Both vessels were slow-moving (avg speeds 0.4 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Ust-Luga/St. Petersburg Approach, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness15/25Min distance 280m, avg 291m
Duration25/25Duration 228 minutes
Speed Stability17/20both nearly stationary; stable speeds
Distance Consistency15/15Distance variance ±18m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Ust-Luga/St. Petersburg Approach

🛰️ Satellite Corroboration

? SAR Inconclusive

Satellite imagery available but requires review

Preview available for manual review

Scene: S1D_IW_GRDH_1SDV_20260830T153136_20260830T153201_004357_0080BA_ED1B_COG • Acquired: 2026-08-30T15:31:36.144504Z • Platform: sentinel-1d
SAR satellite preview for event 1173526

Click image to view full size

Searched: 2026-08-31T09:45:02.153779+00:00

Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273353550,
        "name": "EUROSTAR 4 MARIA",
        "flag": "RUSSIA"
    },
    "vessel_b": {
        "mmsi": 273458830,
        "imo": 8033089,
        "name": "SGV FLOT",
        "flag": "Russia"
    },
    "min_distance_m": 280.19999999999998863131622783839702606201171875,
    "avg_distance_m": 290.69999999999998863131622783839702606201171875,
    "distance_consistency_m": 17.699999999999999289457264239899814128875732421875,
    "duration_minutes": 228.30000000000001136868377216160297393798828125,
    "overlap_duration_s": 13698,
    "speed_a_avg": 0.440000000000000002220446049250313080847263336181640625,
    "speed_a_std": 0.35999999999999998667732370449812151491641998291015625,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.440000000000000002220446049250313080847263336181640625,
            "max_sog": 1.399999999999999911182158029987476766109466552734375
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-08-31T03:09:27+00:00",
        "end": "2026-08-31T06:57:45+00:00"
    },
    "points_count": {
        "vessel_a": 19,
        "vessel_b": 19
    },
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "score": {
        "value": 82,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 280m, avg 291m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 228 minutes"
            },
            "speed_stability": {
                "score": 17,
                "max": 20,
                "detail": "both nearly stationary; stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b118m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Ust-Luga\/St. Petersburg Approach"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (EUROSTAR 4 MARIA and SGV FLOT) maintained close proximity (min 280m, avg 291m) for 228 minutes. Both vessels were slow-moving (avg speeds 0.4 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Ust-Luga\/St. Petersburg Approach, a known STS activity area."
    },
    "sar": {
        "status": "inconclusive",
        "centroid": {
            "lat": 59.87680879999999916663000476546585559844970703125,
            "lon": 30.220630499999998619387042708694934844970703125
        },
        "time_window": {
            "start_ts": "2026-08-31T03:08:04+00:00",
            "end_ts": "2026-08-31T06:57:45+00:00"
        },
        "searched_at": "2026-08-31T09:45:02.153779+00:00",
        "scene_id": "S1D_IW_GRDH_1SDV_20260830T153136_20260830T153201_004357_0080BA_ED1B_COG",
        "scene_datetime": "2026-08-30T15:31:36.144504Z",
        "platform": "sentinel-1d",
        "bbox": {
            "min_lon": 29.001000999999998697376213385723531246185302734375,
            "min_lat": 59.5085830000000015616024029441177845001220703125,
            "max_lon": 34.32946799999999853980625630356371402740478515625,
            "max_lat": 61.43689299999999775536707602441310882568359375
        },
        "assets": {
            "preview_url": "https:\/\/fleetleaks.com\/wp-content\/uploads\/fleetleaks-evidence\/sar-imagery\/2026\/08\/event_1173526_thumbnail_20260831094507.png",
            "stored_path": "\/home\/fleetleaks\/public_html\/wp-content\/uploads\/fleetleaks-evidence\/sar-imagery\/2026\/08\/event_1173526_thumbnail_20260831094507.png",
            "source": "copernicus_dataspace"
        },
        "notes": "Preview available for manual review"
    }
}
Methodology: 2026.01.18
Zone Dwell Ust-Luga/St. Petersburg Approach
Aug 31, 2026 03:08 UTC 80.0% ▼
  • Zone: Ust-Luga/St. Petersburg Approach
  • Duration: 6h 36m
  • Data Points: 47 AIS positions
  • Period: 2026-08-31T03:40:19+00:00 to 2026-08-31T10:17:09+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 396.80000000000001136868377216160297393798828125,
    "points_in_zone": 47,
    "first_point": {
        "ts": "2026-08-31T03:40:19+00:00",
        "lat": 59.87689999999999912461134954355657100677490234375,
        "lon": 30.218050000000001631406121305190026760101318359375
    },
    "last_point": {
        "ts": "2026-08-31T10:17:09+00:00",
        "lat": 59.876883300000002918750396929681301116943359375,
        "lon": 30.218116699999999497094904654659330844879150390625
    }
}
Methodology: 2026.01.18
Loiter Ust-Luga/St. Petersburg Approach
Aug 31, 2026 03:08 UTC 75.0% ▼
  • Duration: 6h 36m
  • Radius: 4 meters
  • Data Points: 47 AIS positions
  • Centroid: 59.8769, 30.2181
  • Zone: Ust-Luga/St. Petersburg Approach
Show Raw Evidence JSON
{
    "radius_m": 4.4000000000000003552713678800500929355621337890625,
    "duration_minutes": 396.80000000000001136868377216160297393798828125,
    "points": 47,
    "centroid": {
        "lat": 59.87689751702126983445850783027708530426025390625,
        "lon": 30.21809964255322000781234237365424633026123046875
    },
    "bbox": {
        "min_lat": 59.87686670000000077607182902283966541290283203125,
        "min_lon": 30.218050000000001631406121305190026760101318359375,
        "max_lat": 59.87693329999999747315087006427347660064697265625,
        "max_lon": 30.218133300000001639773472561500966548919677734375
    },
    "zone_id": "russia_ust_luga_approach"
}
Methodology: 2026.01.18
Sts Ust-Luga/St. Petersburg Approach
Aug 31, 2026 02:01 UTC 82/100 ▼
Vessel A: MMSI 273353550 (EUROSTAR 4 MARIA) RUSSIA
Vessel B: IMO 8033089 (SGV FLOT) Russia
  • Minimum Distance: 280 meters
  • Average Distance: 290 meters
  • Duration: 4h 13m
  • Period: 2026-08-31T02:44:46+00:00 to 2026-08-31T06:57:45+00:00
  • Vessel A Avg Speed: 0.4 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Ust-Luga/St. Petersburg Approach

Confidence Analysis

Score: 82/100

High-confidence STS candidate. Two tankers (EUROSTAR 4 MARIA and SGV FLOT) maintained close proximity (min 280m, avg 290m) for 253 minutes. Both vessels were slow-moving (avg speeds 0.4 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Ust-Luga/St. Petersburg Approach, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness15/25Min distance 280m, avg 290m
Duration25/25Duration 253 minutes
Speed Stability17/20both nearly stationary; stable speeds
Distance Consistency15/15Distance variance ±17m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Ust-Luga/St. Petersburg Approach
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273353550,
        "name": "EUROSTAR 4 MARIA",
        "flag": "RUSSIA"
    },
    "vessel_b": {
        "mmsi": 273458830,
        "imo": 8033089,
        "name": "SGV FLOT",
        "flag": "Russia"
    },
    "min_distance_m": 280.19999999999998863131622783839702606201171875,
    "avg_distance_m": 290.30000000000001136868377216160297393798828125,
    "distance_consistency_m": 16.800000000000000710542735760100185871124267578125,
    "duration_minutes": 253,
    "overlap_duration_s": 15179,
    "speed_a_avg": 0.429999999999999993338661852249060757458209991455078125,
    "speed_a_std": 0.34999999999999997779553950749686919152736663818359375,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.429999999999999993338661852249060757458209991455078125,
            "max_sog": 1.399999999999999911182158029987476766109466552734375
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-08-31T02:44:46+00:00",
        "end": "2026-08-31T06:57:45+00:00"
    },
    "points_count": {
        "vessel_a": 21,
        "vessel_b": 21
    },
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "score": {
        "value": 82,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 280m, avg 290m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 253 minutes"
            },
            "speed_stability": {
                "score": 17,
                "max": 20,
                "detail": "both nearly stationary; stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b117m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Ust-Luga\/St. Petersburg Approach"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (EUROSTAR 4 MARIA and SGV FLOT) maintained close proximity (min 280m, avg 290m) for 253 minutes. Both vessels were slow-moving (avg speeds 0.4 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Ust-Luga\/St. Petersburg Approach, a known STS activity area."
    }
}
Methodology: 2026.01.18
Zone Dwell Ust-Luga/St. Petersburg Approach
Aug 31, 2026 02:01 UTC 80.0% ▼
  • Zone: Ust-Luga/St. Petersburg Approach
  • Duration: 6h 36m
  • Data Points: 45 AIS positions
  • Period: 2026-08-31T02:52:03+00:00 to 2026-08-31T09:28:37+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 396.6000000000000227373675443232059478759765625,
    "points_in_zone": 45,
    "first_point": {
        "ts": "2026-08-31T02:52:03+00:00",
        "lat": 59.87689999999999912461134954355657100677490234375,
        "lon": 30.218116699999999497094904654659330844879150390625
    },
    "last_point": {
        "ts": "2026-08-31T09:28:37+00:00",
        "lat": 59.87691670000000243589965975843369960784912109375,
        "lon": 30.218116699999999497094904654659330844879150390625
    }
}
Methodology: 2026.01.18
Loiter Ust-Luga/St. Petersburg Approach
Aug 31, 2026 02:01 UTC 75.0% ▼
  • Duration: 6h 36m
  • Radius: 4 meters
  • Data Points: 45 AIS positions
  • Centroid: 59.8769, 30.2181
  • Zone: Ust-Luga/St. Petersburg Approach
Show Raw Evidence JSON
{
    "radius_m": 4.20000000000000017763568394002504646778106689453125,
    "duration_minutes": 396.6000000000000227373675443232059478759765625,
    "points": 45,
    "centroid": {
        "lat": 59.87689963111112234628308215178549289703369140625,
        "lon": 30.218099257777797816970632993616163730621337890625
    },
    "bbox": {
        "min_lat": 59.87686670000000077607182902283966541290283203125,
        "min_lon": 30.218050000000001631406121305190026760101318359375,
        "max_lat": 59.87693329999999747315087006427347660064697265625,
        "max_lon": 30.218133300000001639773472561500966548919677734375
    },
    "zone_id": "russia_ust_luga_approach"
}
Methodology: 2026.01.18
Sts🛰️? Ust-Luga/St. Petersburg Approach
Aug 31, 2026 01:19 UTC 82/100 ▼
Vessel A: MMSI 273353550 (EUROSTAR 4 MARIA) RUSSIA
Vessel B: IMO 8033089 (SGV FLOT) Russia
  • Minimum Distance: 280 meters
  • Average Distance: 289 meters
  • Duration: 4h 57m
  • Period: 2026-08-31T01:19:47+00:00 to 2026-08-31T06:16:55+00:00
  • Vessel A Avg Speed: 0.4 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Ust-Luga/St. Petersburg Approach

Confidence Analysis

Score: 82/100

High-confidence STS candidate. Two tankers (EUROSTAR 4 MARIA and SGV FLOT) maintained close proximity (min 280m, avg 289m) for 297 minutes. Both vessels were slow-moving (avg speeds 0.4 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Ust-Luga/St. Petersburg Approach, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness15/25Min distance 280m, avg 289m
Duration25/25Duration 297 minutes
Speed Stability17/20both nearly stationary; stable speeds
Distance Consistency15/15Distance variance ±15m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Ust-Luga/St. Petersburg Approach

🛰️ Satellite Corroboration

? SAR Inconclusive

Satellite imagery available but requires review

Preview available for manual review

Scene: S1D_IW_GRDH_1SDV_20260830T153136_20260830T153201_004357_0080BA_ED1B_COG • Acquired: 2026-08-30T15:31:36.144504Z • Platform: sentinel-1d
SAR satellite preview for event 1172884

Click image to view full size

Searched: 2026-08-31T06:45:07.427357+00:00

Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273353550,
        "name": "EUROSTAR 4 MARIA",
        "flag": "RUSSIA"
    },
    "vessel_b": {
        "mmsi": 273458830,
        "imo": 8033089,
        "name": "SGV FLOT",
        "flag": "Russia"
    },
    "min_distance_m": 280.19999999999998863131622783839702606201171875,
    "avg_distance_m": 288.8999999999999772626324556767940521240234375,
    "distance_consistency_m": 15,
    "duration_minutes": 297.1000000000000227373675443232059478759765625,
    "overlap_duration_s": 17828,
    "speed_a_avg": 0.429999999999999993338661852249060757458209991455078125,
    "speed_a_std": 0.34999999999999997779553950749686919152736663818359375,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.429999999999999993338661852249060757458209991455078125,
            "max_sog": 1.399999999999999911182158029987476766109466552734375
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-08-31T01:19:47+00:00",
        "end": "2026-08-31T06:16:55+00:00"
    },
    "points_count": {
        "vessel_a": 27,
        "vessel_b": 27
    },
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "score": {
        "value": 82,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 280m, avg 289m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 297 minutes"
            },
            "speed_stability": {
                "score": 17,
                "max": 20,
                "detail": "both nearly stationary; stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b115m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Ust-Luga\/St. Petersburg Approach"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (EUROSTAR 4 MARIA and SGV FLOT) maintained close proximity (min 280m, avg 289m) for 297 minutes. Both vessels were slow-moving (avg speeds 0.4 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Ust-Luga\/St. Petersburg Approach, a known STS activity area."
    },
    "sar": {
        "status": "inconclusive",
        "centroid": {
            "lat": 59.87686370000000124491634778678417205810546875,
            "lon": 30.220657599999999121109794941730797290802001953125
        },
        "time_window": {
            "start_ts": "2026-08-31T01:19:47+00:00",
            "end_ts": "2026-08-31T06:16:55+00:00"
        },
        "searched_at": "2026-08-31T06:45:07.427357+00:00",
        "scene_id": "S1D_IW_GRDH_1SDV_20260830T153136_20260830T153201_004357_0080BA_ED1B_COG",
        "scene_datetime": "2026-08-30T15:31:36.144504Z",
        "platform": "sentinel-1d",
        "bbox": {
            "min_lon": 29.001000999999998697376213385723531246185302734375,
            "min_lat": 59.5085830000000015616024029441177845001220703125,
            "max_lon": 34.32946799999999853980625630356371402740478515625,
            "max_lat": 61.43689299999999775536707602441310882568359375
        },
        "assets": {
            "preview_url": "https:\/\/fleetleaks.com\/wp-content\/uploads\/fleetleaks-evidence\/sar-imagery\/2026\/08\/event_1172884_thumbnail_20260831064511.png",
            "stored_path": "\/home\/fleetleaks\/public_html\/wp-content\/uploads\/fleetleaks-evidence\/sar-imagery\/2026\/08\/event_1172884_thumbnail_20260831064511.png",
            "source": "copernicus_dataspace"
        },
        "notes": "Preview available for manual review"
    }
}
Methodology: 2026.01.18
Zone Dwell Ust-Luga/St. Petersburg Approach
Aug 31, 2026 01:03 UTC 80.0% ▼
  • Zone: Ust-Luga/St. Petersburg Approach
  • Duration: 6h 31m
  • Data Points: 44 AIS positions
  • Period: 2026-08-31T01:56:18+00:00 to 2026-08-31T08:28:06+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 391.80000000000001136868377216160297393798828125,
    "points_in_zone": 44,
    "first_point": {
        "ts": "2026-08-31T01:56:18+00:00",
        "lat": 59.87689999999999912461134954355657100677490234375,
        "lon": 30.21809999999999973852027324028313159942626953125
    },
    "last_point": {
        "ts": "2026-08-31T08:28:06+00:00",
        "lat": 59.87689999999999912461134954355657100677490234375,
        "lon": 30.21809999999999973852027324028313159942626953125
    }
}
Methodology: 2026.01.18
Loiter Ust-Luga/St. Petersburg Approach
Aug 31, 2026 01:03 UTC 75.0% ▼
  • Duration: 6h 31m
  • Radius: 4 meters
  • Data Points: 44 AIS positions
  • Centroid: 59.8769, 30.2181
  • Zone: Ust-Luga/St. Petersburg Approach
Show Raw Evidence JSON
{
    "radius_m": 4.4000000000000003552713678800500929355621337890625,
    "duration_minutes": 391.80000000000001136868377216160297393798828125,
    "points": 44,
    "centroid": {
        "lat": 59.876897727272734073267201893031597137451171875,
        "lon": 30.21809734318183160439730272628366947174072265625
    },
    "bbox": {
        "min_lat": 59.87686670000000077607182902283966541290283203125,
        "min_lon": 30.218050000000001631406121305190026760101318359375,
        "max_lat": 59.87693329999999747315087006427347660064697265625,
        "max_lon": 30.218133300000001639773472561500966548919677734375
    },
    "zone_id": "russia_ust_luga_approach"
}
Methodology: 2026.01.18
Zone Dwell Ust-Luga/St. Petersburg Approach
Aug 31, 2026 00:04 UTC 80.0% ▼
  • Zone: Ust-Luga/St. Petersburg Approach
  • Duration: 6h 32m
  • Data Points: 55 AIS positions
  • Period: 2026-08-31T00:55:59+00:00 to 2026-08-31T07:28:41+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 392.69999999999998863131622783839702606201171875,
    "points_in_zone": 55,
    "first_point": {
        "ts": "2026-08-31T00:55:59+00:00",
        "lat": 59.87689999999999912461134954355657100677490234375,
        "lon": 30.21809999999999973852027324028313159942626953125
    },
    "last_point": {
        "ts": "2026-08-31T07:28:41+00:00",
        "lat": 59.87691670000000243589965975843369960784912109375,
        "lon": 30.218083299999999979945641825906932353973388671875
    }
}
Methodology: 2026.01.18
Loiter Ust-Luga/St. Petersburg Approach
Aug 31, 2026 00:04 UTC 75.0% ▼
  • Duration: 6h 32m
  • Radius: 4 meters
  • Data Points: 55 AIS positions
  • Centroid: 59.8769, 30.2181
  • Zone: Ust-Luga/St. Petersburg Approach
Show Raw Evidence JSON
{
    "radius_m": 4.4000000000000003552713678800500929355621337890625,
    "duration_minutes": 392.69999999999998863131622783839702606201171875,
    "points": 55,
    "centroid": {
        "lat": 59.8768984854545607277032104320824146270751953125,
        "lon": 30.218096660000018260916476720012724399566650390625
    },
    "bbox": {
        "min_lat": 59.87686670000000077607182902283966541290283203125,
        "min_lon": 30.218050000000001631406121305190026760101318359375,
        "max_lat": 59.87693329999999747315087006427347660064697265625,
        "max_lon": 30.218133300000001639773472561500966548919677734375
    },
    "zone_id": "russia_ust_luga_approach"
}
Methodology: 2026.01.18
Zone Dwell Ust-Luga/St. Petersburg Approach
Aug 30, 2026 23:12 UTC 80.0% ▼
  • Zone: Ust-Luga/St. Petersburg Approach
  • Duration: 6h 34m
  • Data Points: 62 AIS positions
  • Period: 2026-08-30T23:51:55+00:00 to 2026-08-31T06:26:45+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 394.80000000000001136868377216160297393798828125,
    "points_in_zone": 62,
    "first_point": {
        "ts": "2026-08-30T23:51:55+00:00",
        "lat": 59.87691670000000243589965975843369960784912109375,
        "lon": 30.21806670000000138998075271956622600555419921875
    },
    "last_point": {
        "ts": "2026-08-31T06:26:45+00:00",
        "lat": 59.87691670000000243589965975843369960784912109375,
        "lon": 30.21809999999999973852027324028313159942626953125
    }
}
Methodology: 2026.01.18
Loiter Ust-Luga/St. Petersburg Approach
Aug 30, 2026 23:12 UTC 75.0% ▼
  • Duration: 6h 34m
  • Radius: 4 meters
  • Data Points: 62 AIS positions
  • Centroid: 59.8769, 30.2181
  • Zone: Ust-Luga/St. Petersburg Approach
Show Raw Evidence JSON
{
    "radius_m": 4.0999999999999996447286321199499070644378662109375,
    "duration_minutes": 394.80000000000001136868377216160297393798828125,
    "points": 62,
    "centroid": {
        "lat": 59.87689811935486972060971311293542385101318359375,
        "lon": 30.21809408225808368797515868209302425384521484375
    },
    "bbox": {
        "min_lat": 59.87686670000000077607182902283966541290283203125,
        "min_lon": 30.218050000000001631406121305190026760101318359375,
        "max_lat": 59.87691670000000243589965975843369960784912109375,
        "max_lon": 30.218133300000001639773472561500966548919677734375
    },
    "zone_id": "russia_ust_luga_approach"
}
Methodology: 2026.01.18
Sts🛰️? Ust-Luga/St. Petersburg Approach
Aug 30, 2026 22:13 UTC 85/100 ▼
Vessel A: MMSI 273353550 (EUROSTAR 4 MARIA) RUSSIA
Vessel B: IMO 8033089 (SGV FLOT) Russia
  • Minimum Distance: 281 meters
  • Average Distance: 285 meters
  • Duration: 5h 36m
  • Period: 2026-08-30T22:13:29+00:00 to 2026-08-31T03:50:16+00:00
  • Vessel A Avg Speed: 0.4 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Ust-Luga/St. Petersburg Approach

Confidence Analysis

Score: 85/100

High-confidence STS candidate. Two tankers (EUROSTAR 4 MARIA and SGV FLOT) maintained close proximity (min 281m, avg 285m) for 337 minutes. Both vessels were slow-moving (avg speeds 0.4 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Ust-Luga/St. Petersburg Approach, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness15/25Min distance 281m, avg 285m
Duration25/25Duration 337 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±2m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Ust-Luga/St. Petersburg Approach

🛰️ Satellite Corroboration

? SAR Inconclusive

Satellite imagery available but requires review

Preview available for manual review

Scene: S1D_IW_GRDH_1SDV_20260830T153136_20260830T153201_004357_0080BA_ED1B_COG • Acquired: 2026-08-30T15:31:36.144504Z • Platform: sentinel-1d
SAR satellite preview for event 1172197

Click image to view full size

Searched: 2026-08-31T04:45:01.471935+00:00

Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273353550,
        "name": "EUROSTAR 4 MARIA",
        "flag": "RUSSIA"
    },
    "vessel_b": {
        "mmsi": 273458830,
        "imo": 8033089,
        "name": "SGV FLOT",
        "flag": "Russia"
    },
    "min_distance_m": 281.19999999999998863131622783839702606201171875,
    "avg_distance_m": 284.69999999999998863131622783839702606201171875,
    "distance_consistency_m": 1.6999999999999999555910790149937383830547332763671875,
    "duration_minutes": 336.80000000000001136868377216160297393798828125,
    "overlap_duration_s": 20207,
    "speed_a_avg": 0.35999999999999998667732370449812151491641998291015625,
    "speed_a_std": 0.2600000000000000088817841970012523233890533447265625,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.35999999999999998667732370449812151491641998291015625,
            "max_sog": 1.100000000000000088817841970012523233890533447265625
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-08-30T22:13:29+00:00",
        "end": "2026-08-31T03:50:16+00:00"
    },
    "points_count": {
        "vessel_a": 19,
        "vessel_b": 19
    },
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "score": {
        "value": 85,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 281m, avg 285m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 337 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: Ust-Luga\/St. Petersburg Approach"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (EUROSTAR 4 MARIA and SGV FLOT) maintained close proximity (min 281m, avg 285m) for 337 minutes. Both vessels were slow-moving (avg speeds 0.4 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Ust-Luga\/St. Petersburg Approach, a known STS activity area."
    },
    "sar": {
        "status": "inconclusive",
        "centroid": {
            "lat": 59.87681719999999785386535222642123699188232421875,
            "lon": 30.22063440000000156260284711606800556182861328125
        },
        "time_window": {
            "start_ts": "2026-08-30T22:13:29+00:00",
            "end_ts": "2026-08-31T03:50:16+00:00"
        },
        "searched_at": "2026-08-31T04:45:01.471935+00:00",
        "scene_id": "S1D_IW_GRDH_1SDV_20260830T153136_20260830T153201_004357_0080BA_ED1B_COG",
        "scene_datetime": "2026-08-30T15:31:36.144504Z",
        "platform": "sentinel-1d",
        "bbox": {
            "min_lon": 29.001000999999998697376213385723531246185302734375,
            "min_lat": 59.5085830000000015616024029441177845001220703125,
            "max_lon": 34.32946799999999853980625630356371402740478515625,
            "max_lat": 61.43689299999999775536707602441310882568359375
        },
        "assets": {
            "preview_url": "https:\/\/fleetleaks.com\/wp-content\/uploads\/fleetleaks-evidence\/sar-imagery\/2026\/08\/event_1172197_thumbnail_20260831044505.png",
            "stored_path": "\/home\/fleetleaks\/public_html\/wp-content\/uploads\/fleetleaks-evidence\/sar-imagery\/2026\/08\/event_1172197_thumbnail_20260831044505.png",
            "source": "copernicus_dataspace"
        },
        "notes": "Preview available for manual review"
    }
}
Methodology: 2026.01.18
Zone Dwell Ust-Luga/St. Petersburg Approach
Aug 30, 2026 22:10 UTC 80.0% ▼
  • Zone: Ust-Luga/St. Petersburg Approach
  • Duration: 6h 32m
  • Data Points: 65 AIS positions
  • Period: 2026-08-30T22:55:24+00:00 to 2026-08-31T05:27:49+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 392.3999999999999772626324556767940521240234375,
    "points_in_zone": 65,
    "first_point": {
        "ts": "2026-08-30T22:55:24+00:00",
        "lat": 59.87691670000000243589965975843369960784912109375,
        "lon": 30.218083299999999979945641825906932353973388671875
    },
    "last_point": {
        "ts": "2026-08-31T05:27:49+00:00",
        "lat": 59.87686670000000077607182902283966541290283203125,
        "lon": 30.21809999999999973852027324028313159942626953125
    }
}
Methodology: 2026.01.18
Loiter Ust-Luga/St. Petersburg Approach
Aug 30, 2026 22:10 UTC 75.0% ▼
  • Duration: 6h 32m
  • Radius: 4 meters
  • Data Points: 65 AIS positions
  • Centroid: 59.8769, 30.2181
  • Zone: Ust-Luga/St. Petersburg Approach
Show Raw Evidence JSON
{
    "radius_m": 4.20000000000000017763568394002504646778106689453125,
    "duration_minutes": 392.3999999999999772626324556767940521240234375,
    "points": 65,
    "centroid": {
        "lat": 59.8768982061538821426438516937196254730224609375,
        "lon": 30.218093327692333360801058006472885608673095703125
    },
    "bbox": {
        "min_lat": 59.87686670000000077607182902283966541290283203125,
        "min_lon": 30.218050000000001631406121305190026760101318359375,
        "max_lat": 59.87691670000000243589965975843369960784912109375,
        "max_lon": 30.218133300000001639773472561500966548919677734375
    },
    "zone_id": "russia_ust_luga_approach"
}
Methodology: 2026.01.18
Sts Ust-Luga/St. Petersburg Approach
Aug 30, 2026 21:45 UTC 85/100 ▼
Vessel A: MMSI 273353550 (EUROSTAR 4 MARIA) RUSSIA
Vessel B: IMO 8033089 (SGV FLOT) Russia
  • Minimum Distance: 281 meters
  • Average Distance: 284 meters
  • Duration: 4h 53m
  • Period: 2026-08-30T21:51:48+00:00 to 2026-08-31T02:44:46+00:00
  • Vessel A Avg Speed: 0.4 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Ust-Luga/St. Petersburg Approach

Confidence Analysis

Score: 85/100

High-confidence STS candidate. Two tankers (EUROSTAR 4 MARIA and SGV FLOT) maintained close proximity (min 281m, avg 284m) for 293 minutes. Both vessels were slow-moving (avg speeds 0.4 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Ust-Luga/St. Petersburg Approach, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness15/25Min distance 281m, avg 284m
Duration25/25Duration 293 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±2m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Ust-Luga/St. Petersburg Approach
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273353550,
        "name": "EUROSTAR 4 MARIA",
        "flag": "RUSSIA"
    },
    "vessel_b": {
        "mmsi": 273458830,
        "imo": 8033089,
        "name": "SGV FLOT",
        "flag": "Russia"
    },
    "min_distance_m": 281.19999999999998863131622783839702606201171875,
    "avg_distance_m": 284.3999999999999772626324556767940521240234375,
    "distance_consistency_m": 1.6999999999999999555910790149937383830547332763671875,
    "duration_minutes": 293,
    "overlap_duration_s": 17578,
    "speed_a_avg": 0.38000000000000000444089209850062616169452667236328125,
    "speed_a_std": 0.270000000000000017763568394002504646778106689453125,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.38000000000000000444089209850062616169452667236328125,
            "max_sog": 1.100000000000000088817841970012523233890533447265625
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-08-30T21:51:48+00:00",
        "end": "2026-08-31T02:44:46+00:00"
    },
    "points_count": {
        "vessel_a": 13,
        "vessel_b": 13
    },
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "score": {
        "value": 85,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 281m, avg 284m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 293 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: Ust-Luga\/St. Petersburg Approach"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (EUROSTAR 4 MARIA and SGV FLOT) maintained close proximity (min 281m, avg 284m) for 293 minutes. Both vessels were slow-moving (avg speeds 0.4 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Ust-Luga\/St. Petersburg Approach, a known STS activity area."
    }
}
Methodology: 2026.01.18
Zone Dwell Ust-Luga/St. Petersburg Approach
Aug 30, 2026 21:10 UTC 80.0% ▼
  • Zone: Ust-Luga/St. Petersburg Approach
  • Duration: 6h 27m
  • Data Points: 64 AIS positions
  • Period: 2026-08-30T21:59:55+00:00 to 2026-08-31T04:27:34+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 387.6000000000000227373675443232059478759765625,
    "points_in_zone": 64,
    "first_point": {
        "ts": "2026-08-30T21:59:55+00:00",
        "lat": 59.87691670000000243589965975843369960784912109375,
        "lon": 30.218083299999999979945641825906932353973388671875
    },
    "last_point": {
        "ts": "2026-08-31T04:27:34+00:00",
        "lat": 59.87689999999999912461134954355657100677490234375,
        "lon": 30.218083299999999979945641825906932353973388671875
    }
}
Methodology: 2026.01.18
Loiter Ust-Luga/St. Petersburg Approach
Aug 30, 2026 21:10 UTC 75.0% ▼
  • Duration: 6h 27m
  • Radius: 4 meters
  • Data Points: 64 AIS positions
  • Centroid: 59.8769, 30.2181
  • Zone: Ust-Luga/St. Petersburg Approach
Show Raw Evidence JSON
{
    "radius_m": 4.29999999999999982236431605997495353221893310546875,
    "duration_minutes": 387.6000000000000227373675443232059478759765625,
    "points": 64,
    "centroid": {
        "lat": 59.8769000031250442361852037720382213592529296875,
        "lon": 30.2180929640625208776327781379222869873046875
    },
    "bbox": {
        "min_lat": 59.87686670000000077607182902283966541290283203125,
        "min_lon": 30.218050000000001631406121305190026760101318359375,
        "max_lat": 59.87691670000000243589965975843369960784912109375,
        "max_lon": 30.218133300000001639773472561500966548919677734375
    },
    "zone_id": "russia_ust_luga_approach"
}
Methodology: 2026.01.18
Zone Dwell Ust-Luga/St. Petersburg Approach
Aug 30, 2026 20:01 UTC 80.0% ▼
  • Zone: Ust-Luga/St. Petersburg Approach
  • Duration: 6h 34m
  • Data Points: 71 AIS positions
  • Period: 2026-08-30T20:40:28+00:00 to 2026-08-31T03:14:58+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 394.5,
    "points_in_zone": 71,
    "first_point": {
        "ts": "2026-08-30T20:40:28+00:00",
        "lat": 59.87691670000000243589965975843369960784912109375,
        "lon": 30.218133300000001639773472561500966548919677734375
    },
    "last_point": {
        "ts": "2026-08-31T03:14:58+00:00",
        "lat": 59.87689999999999912461134954355657100677490234375,
        "lon": 30.218116699999999497094904654659330844879150390625
    }
}
Methodology: 2026.01.18
Loiter Ust-Luga/St. Petersburg Approach
Aug 30, 2026 20:01 UTC 75.0% ▼
  • Duration: 6h 34m
  • Radius: 4 meters
  • Data Points: 71 AIS positions
  • Centroid: 59.8769, 30.2181
  • Zone: Ust-Luga/St. Petersburg Approach
Show Raw Evidence JSON
{
    "radius_m": 4.20000000000000017763568394002504646778106689453125,
    "duration_minutes": 394.5,
    "points": 71,
    "centroid": {
        "lat": 59.8768995323944324127296567894518375396728515625,
        "lon": 30.2180948309859331857296638190746307373046875
    },
    "bbox": {
        "min_lat": 59.87686670000000077607182902283966541290283203125,
        "min_lon": 30.21806670000000138998075271956622600555419921875,
        "max_lat": 59.87693329999999747315087006427347660064697265625,
        "max_lon": 30.21815000000000139834810397587716579437255859375
    },
    "zone_id": "russia_ust_luga_approach"
}
Methodology: 2026.01.18
Sts Ust-Luga/St. Petersburg Approach
Aug 30, 2026 19:04 UTC 85/100 ▼
Vessel A: MMSI 273353550 (EUROSTAR 4 MARIA) RUSSIA
Vessel B: IMO 8033089 (SGV FLOT) Russia
  • Minimum Distance: 283 meters
  • Average Distance: 286 meters
  • Duration: 6h 17m
  • Period: 2026-08-30T19:07:18+00:00 to 2026-08-31T01:25:06+00:00
  • Vessel A Avg Speed: 0.4 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Ust-Luga/St. Petersburg Approach

Confidence Analysis

Score: 85/100

High-confidence STS candidate. Two tankers (EUROSTAR 4 MARIA and SGV FLOT) maintained close proximity (min 283m, avg 286m) for 378 minutes. Both vessels were slow-moving (avg speeds 0.3 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Ust-Luga/St. Petersburg Approach, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness15/25Min distance 283m, avg 286m
Duration25/25Duration 378 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±2m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Ust-Luga/St. Petersburg Approach
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273353550,
        "name": "EUROSTAR 4 MARIA",
        "flag": "RUSSIA"
    },
    "vessel_b": {
        "mmsi": 273458830,
        "imo": 8033089,
        "name": "SGV FLOT",
        "flag": "Russia"
    },
    "min_distance_m": 283,
    "avg_distance_m": 286.3999999999999772626324556767940521240234375,
    "distance_consistency_m": 2.20000000000000017763568394002504646778106689453125,
    "duration_minutes": 377.80000000000001136868377216160297393798828125,
    "overlap_duration_s": 22668,
    "speed_a_avg": 0.34999999999999997779553950749686919152736663818359375,
    "speed_a_std": 0.200000000000000011102230246251565404236316680908203125,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.34999999999999997779553950749686919152736663818359375,
            "max_sog": 0.59999999999999997779553950749686919152736663818359375
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-08-30T19:07:18+00:00",
        "end": "2026-08-31T01:25:06+00:00"
    },
    "points_count": {
        "vessel_a": 15,
        "vessel_b": 15
    },
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "score": {
        "value": 85,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 283m, avg 286m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 378 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b12m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Ust-Luga\/St. Petersburg Approach"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (EUROSTAR 4 MARIA and SGV FLOT) maintained close proximity (min 283m, avg 286m) for 378 minutes. Both vessels were slow-moving (avg speeds 0.3 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Ust-Luga\/St. Petersburg Approach, a known STS activity area."
    }
}
Methodology: 2026.01.18
Zone Dwell Ust-Luga/St. Petersburg Approach
Aug 30, 2026 19:04 UTC 80.0% ▼
  • Zone: Ust-Luga/St. Petersburg Approach
  • Duration: 6h 36m
  • Data Points: 73 AIS positions
  • Period: 2026-08-30T19:50:43+00:00 to 2026-08-31T02:26:51+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 396.1000000000000227373675443232059478759765625,
    "points_in_zone": 73,
    "first_point": {
        "ts": "2026-08-30T19:50:43+00:00",
        "lat": 59.87691670000000243589965975843369960784912109375,
        "lon": 30.21806670000000138998075271956622600555419921875
    },
    "last_point": {
        "ts": "2026-08-31T02:26:51+00:00",
        "lat": 59.876883300000002918750396929681301116943359375,
        "lon": 30.21809999999999973852027324028313159942626953125
    }
}
Methodology: 2026.01.18
Loiter Ust-Luga/St. Petersburg Approach
Aug 30, 2026 19:04 UTC 75.0% ▼
  • Duration: 6h 36m
  • Radius: 5 meters
  • Data Points: 73 AIS positions
  • Centroid: 59.8769, 30.2181
  • Zone: Ust-Luga/St. Petersburg Approach
Show Raw Evidence JSON
{
    "radius_m": 4.5999999999999996447286321199499070644378662109375,
    "duration_minutes": 396.1000000000000227373675443232059478759765625,
    "points": 73,
    "centroid": {
        "lat": 59.8769022876713137293336330913007259368896484375,
        "lon": 30.2180945164383700785037945024669170379638671875
    },
    "bbox": {
        "min_lat": 59.87686670000000077607182902283966541290283203125,
        "min_lon": 30.21806670000000138998075271956622600555419921875,
        "max_lat": 59.87693329999999747315087006427347660064697265625,
        "max_lon": 30.21815000000000139834810397587716579437255859375
    },
    "zone_id": "russia_ust_luga_approach"
}
Methodology: 2026.01.18
Sts Ust-Luga/St. Petersburg Approach
Aug 30, 2026 18:52 UTC 85/100 ▼
Vessel A: MMSI 273353550 (EUROSTAR 4 MARIA) RUSSIA
Vessel B: IMO 8033089 (SGV FLOT) Russia
  • Minimum Distance: 283 meters
  • Average Distance: 287 meters
  • Duration: 3h 20m
  • Period: 2026-08-30T18:58:38+00:00 to 2026-08-30T22:19:29+00:00
  • Vessel A Avg Speed: 0.3 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Ust-Luga/St. Petersburg Approach

Confidence Analysis

Score: 85/100

High-confidence STS candidate. Two tankers (EUROSTAR 4 MARIA and SGV FLOT) maintained close proximity (min 283m, avg 287m) for 201 minutes. Both vessels were slow-moving (avg speeds 0.3 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Ust-Luga/St. Petersburg Approach, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness15/25Min distance 283m, avg 287m
Duration25/25Duration 201 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±2m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Ust-Luga/St. Petersburg Approach
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273353550,
        "name": "EUROSTAR 4 MARIA",
        "flag": "RUSSIA"
    },
    "vessel_b": {
        "mmsi": 273458830,
        "imo": 8033089,
        "name": "SGV FLOT",
        "flag": "Russia"
    },
    "min_distance_m": 283,
    "avg_distance_m": 286.80000000000001136868377216160297393798828125,
    "distance_consistency_m": 2,
    "duration_minutes": 200.80000000000001136868377216160297393798828125,
    "overlap_duration_s": 12051,
    "speed_a_avg": 0.340000000000000024424906541753443889319896697998046875,
    "speed_a_std": 0.2200000000000000011102230246251565404236316680908203125,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.340000000000000024424906541753443889319896697998046875,
            "max_sog": 0.59999999999999997779553950749686919152736663818359375
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-08-30T18:58:38+00:00",
        "end": "2026-08-30T22:19:29+00:00"
    },
    "points_count": {
        "vessel_a": 14,
        "vessel_b": 14
    },
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "score": {
        "value": 85,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 283m, avg 287m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 201 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: Ust-Luga\/St. Petersburg Approach"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (EUROSTAR 4 MARIA and SGV FLOT) maintained close proximity (min 283m, avg 287m) for 201 minutes. Both vessels were slow-moving (avg speeds 0.3 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Ust-Luga\/St. Petersburg Approach, a known STS activity area."
    }
}
Methodology: 2026.01.18
Zone Dwell Ust-Luga/St. Petersburg Approach
Aug 30, 2026 18:01 UTC 80.0% ▼
  • Zone: Ust-Luga/St. Petersburg Approach
  • Duration: 6h 31m
  • Data Points: 72 AIS positions
  • Period: 2026-08-30T18:52:19+00:00 to 2026-08-31T01:24:06+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 391.80000000000001136868377216160297393798828125,
    "points_in_zone": 72,
    "first_point": {
        "ts": "2026-08-30T18:52:19+00:00",
        "lat": 59.87689999999999912461134954355657100677490234375,
        "lon": 30.21806670000000138998075271956622600555419921875
    },
    "last_point": {
        "ts": "2026-08-31T01:24:06+00:00",
        "lat": 59.87689999999999912461134954355657100677490234375,
        "lon": 30.21809999999999973852027324028313159942626953125
    }
}
Methodology: 2026.01.18
Loiter Ust-Luga/St. Petersburg Approach
Aug 30, 2026 18:01 UTC 75.0% ▼
  • Duration: 6h 31m
  • Radius: 5 meters
  • Data Points: 72 AIS positions
  • Centroid: 59.8769, 30.2181
  • Zone: Ust-Luga/St. Petersburg Approach
Show Raw Evidence JSON
{
    "radius_m": 4.5999999999999996447286321199499070644378662109375,
    "duration_minutes": 391.80000000000001136868377216160297393798828125,
    "points": 72,
    "centroid": {
        "lat": 59.87690579722228534365058294497430324554443359375,
        "lon": 30.21809235694446016395886545069515705108642578125
    },
    "bbox": {
        "min_lat": 59.87686670000000077607182902283966541290283203125,
        "min_lon": 30.218050000000001631406121305190026760101318359375,
        "max_lat": 59.87693329999999747315087006427347660064697265625,
        "max_lon": 30.21815000000000139834810397587716579437255859375
    },
    "zone_id": "russia_ust_luga_approach"
}
Methodology: 2026.01.18
Zone Dwell Ust-Luga/St. Petersburg Approach
Aug 30, 2026 17:06 UTC 80.0% ▼
  • Zone: Ust-Luga/St. Petersburg Approach
  • Duration: 6h 32m
  • Data Points: 70 AIS positions
  • Period: 2026-08-30T17:51:16+00:00 to 2026-08-31T00:24:01+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 392.80000000000001136868377216160297393798828125,
    "points_in_zone": 70,
    "first_point": {
        "ts": "2026-08-30T17:51:16+00:00",
        "lat": 59.87691670000000243589965975843369960784912109375,
        "lon": 30.218083299999999979945641825906932353973388671875
    },
    "last_point": {
        "ts": "2026-08-31T00:24:01+00:00",
        "lat": 59.87689999999999912461134954355657100677490234375,
        "lon": 30.21806670000000138998075271956622600555419921875
    }
}
Methodology: 2026.01.18
Loiter Ust-Luga/St. Petersburg Approach
Aug 30, 2026 17:06 UTC 75.0% ▼
  • Duration: 6h 32m
  • Radius: 5 meters
  • Data Points: 70 AIS positions
  • Centroid: 59.8769, 30.2181
  • Zone: Ust-Luga/St. Petersburg Approach
Show Raw Evidence JSON
{
    "radius_m": 4.70000000000000017763568394002504646778106689453125,
    "duration_minutes": 392.80000000000001136868377216160297393798828125,
    "points": 70,
    "centroid": {
        "lat": 59.87690667571433777993661351501941680908203125,
        "lon": 30.218090947142872693120807525701820850372314453125
    },
    "bbox": {
        "min_lat": 59.87686670000000077607182902283966541290283203125,
        "min_lon": 30.218050000000001631406121305190026760101318359375,
        "max_lat": 59.87693329999999747315087006427347660064697265625,
        "max_lon": 30.21815000000000139834810397587716579437255859375
    },
    "zone_id": "russia_ust_luga_approach"
}
Methodology: 2026.01.18
Sts🛰️? Ust-Luga/St. Petersburg Approach
Aug 30, 2026 16:07 UTC 85/100 ▼
Vessel A: MMSI 273353550 (EUROSTAR 4 MARIA) RUSSIA
Vessel B: IMO 8033089 (SGV FLOT) Russia
  • Minimum Distance: 283 meters
  • Average Distance: 287 meters
  • Duration: 6h 12m
  • Period: 2026-08-30T16:07:27+00:00 to 2026-08-30T22:19:29+00:00
  • Vessel A Avg Speed: 0.4 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Ust-Luga/St. Petersburg Approach

Confidence Analysis

Score: 85/100

High-confidence STS candidate. Two tankers (EUROSTAR 4 MARIA and SGV FLOT) maintained close proximity (min 283m, avg 286m) for 372 minutes. Both vessels were slow-moving (avg speeds 0.4 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Ust-Luga/St. Petersburg Approach, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness15/25Min distance 283m, avg 286m
Duration25/25Duration 372 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±2m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Ust-Luga/St. Petersburg Approach

🛰️ Satellite Corroboration

? SAR Inconclusive

Satellite imagery available but requires review

Preview available for manual review

Scene: S1D_IW_GRDH_1SDV_20260830T153136_20260830T153201_004357_0080BA_ED1B_COG • Acquired: 2026-08-30T15:31:36.144504Z • Platform: sentinel-1d
SAR satellite preview for event 1170619

Click image to view full size

Searched: 2026-08-30T22:45:06.780098+00:00

Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273353550,
        "name": "EUROSTAR 4 MARIA",
        "flag": "RUSSIA"
    },
    "vessel_b": {
        "mmsi": 273458830,
        "imo": 8033089,
        "name": "SGV FLOT",
        "flag": "Russia"
    },
    "min_distance_m": 283,
    "avg_distance_m": 286.5,
    "distance_consistency_m": 2,
    "duration_minutes": 372,
    "overlap_duration_s": 22322,
    "speed_a_avg": 0.35999999999999998667732370449812151491641998291015625,
    "speed_a_std": 0.2600000000000000088817841970012523233890533447265625,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.35999999999999998667732370449812151491641998291015625,
            "max_sog": 0.90000000000000002220446049250313080847263336181640625
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-08-30T16:07:27+00:00",
        "end": "2026-08-30T22:19:29+00:00"
    },
    "points_count": {
        "vessel_a": 16,
        "vessel_b": 16
    },
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "score": {
        "value": 85,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 283m, avg 286m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 372 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: Ust-Luga\/St. Petersburg Approach"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (EUROSTAR 4 MARIA and SGV FLOT) maintained close proximity (min 283m, avg 286m) for 372 minutes. Both vessels were slow-moving (avg speeds 0.4 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Ust-Luga\/St. Petersburg Approach, a known STS activity area."
    },
    "sar": {
        "status": "inconclusive",
        "centroid": {
            "lat": 59.87682989999999705332811572588980197906494140625,
            "lon": 30.22063229999999833808033145032823085784912109375
        },
        "time_window": {
            "start_ts": "2026-08-30T16:07:27+00:00",
            "end_ts": "2026-08-30T22:19:29+00:00"
        },
        "searched_at": "2026-08-30T22:45:06.780098+00:00",
        "scene_id": "S1D_IW_GRDH_1SDV_20260830T153136_20260830T153201_004357_0080BA_ED1B_COG",
        "scene_datetime": "2026-08-30T15:31:36.144504Z",
        "platform": "sentinel-1d",
        "bbox": {
            "min_lon": 29.001000999999998697376213385723531246185302734375,
            "min_lat": 59.5085830000000015616024029441177845001220703125,
            "max_lon": 34.32946799999999853980625630356371402740478515625,
            "max_lat": 61.43689299999999775536707602441310882568359375
        },
        "assets": {
            "preview_url": "https:\/\/fleetleaks.com\/wp-content\/uploads\/fleetleaks-evidence\/sar-imagery\/2026\/08\/event_1170619_thumbnail_20260830224510.png",
            "stored_path": "\/home\/fleetleaks\/public_html\/wp-content\/uploads\/fleetleaks-evidence\/sar-imagery\/2026\/08\/event_1170619_thumbnail_20260830224510.png",
            "source": "copernicus_dataspace"
        },
        "notes": "Preview available for manual review"
    }
}
Methodology: 2026.01.18
Zone Dwell Ust-Luga/St. Petersburg Approach
Aug 30, 2026 16:04 UTC 80.0% ▼
  • Zone: Ust-Luga/St. Petersburg Approach
  • Duration: 6h 31m
  • Data Points: 67 AIS positions
  • Period: 2026-08-30T16:52:23+00:00 to 2026-08-30T23:23:59+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 391.6000000000000227373675443232059478759765625,
    "points_in_zone": 67,
    "first_point": {
        "ts": "2026-08-30T16:52:23+00:00",
        "lat": 59.87689999999999912461134954355657100677490234375,
        "lon": 30.218083299999999979945641825906932353973388671875
    },
    "last_point": {
        "ts": "2026-08-30T23:23:59+00:00",
        "lat": 59.87689999999999912461134954355657100677490234375,
        "lon": 30.21809999999999973852027324028313159942626953125
    }
}
Methodology: 2026.01.18
Loiter Ust-Luga/St. Petersburg Approach
Aug 30, 2026 16:04 UTC 75.0% ▼
  • Duration: 6h 31m
  • Radius: 5 meters
  • Data Points: 67 AIS positions
  • Centroid: 59.8769, 30.2181
  • Zone: Ust-Luga/St. Petersburg Approach
Show Raw Evidence JSON
{
    "radius_m": 4.9000000000000003552713678800500929355621337890625,
    "duration_minutes": 391.6000000000000227373675443232059478759765625,
    "points": 67,
    "centroid": {
        "lat": 59.8769084686567651942823431454598903656005859375,
        "lon": 30.218091537313444661094763432629406452178955078125
    },
    "bbox": {
        "min_lat": 59.87686670000000077607182902283966541290283203125,
        "min_lon": 30.218050000000001631406121305190026760101318359375,
        "max_lat": 59.87693329999999747315087006427347660064697265625,
        "max_lon": 30.21815000000000139834810397587716579437255859375
    },
    "zone_id": "russia_ust_luga_approach"
}
Methodology: 2026.01.18
Zone Dwell Ust-Luga/St. Petersburg Approach
Aug 30, 2026 15:02 UTC 80.0% ▼
  • Zone: Ust-Luga/St. Petersburg Approach
  • Duration: 6h 27m
  • Data Points: 69 AIS positions
  • Period: 2026-08-30T15:54:47+00:00 to 2026-08-30T22:21:47+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 387,
    "points_in_zone": 69,
    "first_point": {
        "ts": "2026-08-30T15:54:47+00:00",
        "lat": 59.87689999999999912461134954355657100677490234375,
        "lon": 30.21809999999999973852027324028313159942626953125
    },
    "last_point": {
        "ts": "2026-08-30T22:21:47+00:00",
        "lat": 59.87689999999999912461134954355657100677490234375,
        "lon": 30.21809999999999973852027324028313159942626953125
    }
}
Methodology: 2026.01.18
Loiter Ust-Luga/St. Petersburg Approach
Aug 30, 2026 15:02 UTC 75.0% ▼
  • Duration: 6h 27m
  • Radius: 5 meters
  • Data Points: 69 AIS positions
  • Centroid: 59.8769, 30.2181
  • Zone: Ust-Luga/St. Petersburg Approach
Show Raw Evidence JSON
{
    "radius_m": 4.9000000000000003552713678800500929355621337890625,
    "duration_minutes": 387,
    "points": 69,
    "centroid": {
        "lat": 59.87690870724640035405172966420650482177734375,
        "lon": 30.21809274927537813937306054867804050445556640625
    },
    "bbox": {
        "min_lat": 59.87686670000000077607182902283966541290283203125,
        "min_lon": 30.218050000000001631406121305190026760101318359375,
        "max_lat": 59.87693329999999747315087006427347660064697265625,
        "max_lon": 30.21815000000000139834810397587716579437255859375
    },
    "zone_id": "russia_ust_luga_approach"
}
Methodology: 2026.01.18
Sts Ust-Luga/St. Petersburg Approach
Aug 30, 2026 14:03 UTC 92/100 ▼
Vessel A: Thoth (THOTH) Russia
Vessel B: IMO 8033089 (SGV FLOT) Russia
  • Minimum Distance: 90 meters
  • Average Distance: 121 meters
  • Duration: 3h 19m
  • Period: 2026-08-30T14:40:19+00:00 to 2026-08-30T17:59:51+00:00
  • Vessel A Avg Speed: 0.2 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Ust-Luga/St. Petersburg Approach

Confidence Analysis

Score: 92/100

High-confidence STS candidate. Two tankers (THOTH and SGV FLOT) maintained close proximity (min 90m, avg 121m) for 200 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 Ust-Luga/St. Petersburg Approach, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness25/25Min distance 90m, avg 121m
Duration25/25Duration 200 minutes
Speed Stability17/20both nearly stationary; stable speeds
Distance Consistency15/15Distance variance ±12m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Ust-Luga/St. Petersburg Approach
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273253080,
        "imo": 9164718,
        "name": "THOTH",
        "flag": "Russia"
    },
    "vessel_b": {
        "mmsi": 273458830,
        "imo": 8033089,
        "name": "SGV FLOT",
        "flag": "Russia"
    },
    "min_distance_m": 90.099999999999994315658113919198513031005859375,
    "avg_distance_m": 121.099999999999994315658113919198513031005859375,
    "distance_consistency_m": 12.4000000000000003552713678800500929355621337890625,
    "duration_minutes": 199.5,
    "overlap_duration_s": 11972,
    "speed_a_avg": 0.1499999999999999944488848768742172978818416595458984375,
    "speed_a_std": 0.34999999999999997779553950749686919152736663818359375,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.1499999999999999944488848768742172978818416595458984375,
            "max_sog": 1.100000000000000088817841970012523233890533447265625
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-08-30T14:40:19+00:00",
        "end": "2026-08-30T17:59:51+00:00"
    },
    "points_count": {
        "vessel_a": 10,
        "vessel_b": 10
    },
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "score": {
        "value": 92,
        "components": {
            "distance_tightness": {
                "score": 25,
                "max": 25,
                "detail": "Min distance 90m, avg 121m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 200 minutes"
            },
            "speed_stability": {
                "score": 17,
                "max": 20,
                "detail": "both nearly stationary; stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b112m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Ust-Luga\/St. Petersburg Approach"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (THOTH and SGV FLOT) maintained close proximity (min 90m, avg 121m) for 200 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 Ust-Luga\/St. Petersburg Approach, a known STS activity area."
    }
}
Methodology: 2026.01.18
Zone Dwell Ust-Luga/St. Petersburg Approach
Aug 30, 2026 14:03 UTC 80.0% ▼
  • Zone: Ust-Luga/St. Petersburg Approach
  • Duration: 6h 32m
  • Data Points: 76 AIS positions
  • Period: 2026-08-30T14:54:38+00:00 to 2026-08-30T21:27:12+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 392.6000000000000227373675443232059478759765625,
    "points_in_zone": 76,
    "first_point": {
        "ts": "2026-08-30T14:54:38+00:00",
        "lat": 59.87689999999999912461134954355657100677490234375,
        "lon": 30.218083299999999979945641825906932353973388671875
    },
    "last_point": {
        "ts": "2026-08-30T21:27:12+00:00",
        "lat": 59.876883300000002918750396929681301116943359375,
        "lon": 30.218083299999999979945641825906932353973388671875
    }
}
Methodology: 2026.01.18
Loiter Ust-Luga/St. Petersburg Approach
Aug 30, 2026 14:03 UTC 75.0% ▼
  • Duration: 6h 32m
  • Radius: 4 meters
  • Data Points: 76 AIS positions
  • Centroid: 59.8769, 30.2181
  • Zone: Ust-Luga/St. Petersburg Approach
Show Raw Evidence JSON
{
    "radius_m": 4.29999999999999982236431605997495353221893310546875,
    "duration_minutes": 392.6000000000000227373675443232059478759765625,
    "points": 76,
    "centroid": {
        "lat": 59.87690680526321074239604058675467967987060546875,
        "lon": 30.218093196052649318517069332301616668701171875
    },
    "bbox": {
        "min_lat": 59.876883300000002918750396929681301116943359375,
        "min_lon": 30.218050000000001631406121305190026760101318359375,
        "max_lat": 59.87693329999999747315087006427347660064697265625,
        "max_lon": 30.21815000000000139834810397587716579437255859375
    },
    "zone_id": "russia_ust_luga_approach"
}
Methodology: 2026.01.18
Sts Ust-Luga/St. Petersburg Approach
Aug 30, 2026 14:01 UTC 82/100 ▼
Vessel A: MMSI 273353550 (EUROSTAR 4 MARIA) RUSSIA
Vessel B: IMO 8033089 (SGV FLOT) Russia
  • Minimum Distance: 283 meters
  • Average Distance: 286 meters
  • Duration: 6h 11m
  • Period: 2026-08-30T14:01:01+00:00 to 2026-08-30T20:12:27+00:00
  • Vessel A Avg Speed: 0.4 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Ust-Luga/St. Petersburg Approach

Confidence Analysis

Score: 82/100

High-confidence STS candidate. Two tankers (EUROSTAR 4 MARIA and SGV FLOT) maintained close proximity (min 283m, avg 286m) for 371 minutes. Both vessels were slow-moving (avg speeds 0.4 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Ust-Luga/St. Petersburg Approach, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness15/25Min distance 283m, avg 286m
Duration25/25Duration 371 minutes
Speed Stability17/20both nearly stationary; stable speeds
Distance Consistency15/15Distance variance ±2m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Ust-Luga/St. Petersburg Approach
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273353550,
        "name": "EUROSTAR 4 MARIA",
        "flag": "RUSSIA"
    },
    "vessel_b": {
        "mmsi": 273458830,
        "imo": 8033089,
        "name": "SGV FLOT",
        "flag": "Russia"
    },
    "min_distance_m": 283,
    "avg_distance_m": 286.3999999999999772626324556767940521240234375,
    "distance_consistency_m": 2.399999999999999911182158029987476766109466552734375,
    "duration_minutes": 371.3999999999999772626324556767940521240234375,
    "overlap_duration_s": 22286,
    "speed_a_avg": 0.35999999999999998667732370449812151491641998291015625,
    "speed_a_std": 0.309999999999999997779553950749686919152736663818359375,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.35999999999999998667732370449812151491641998291015625,
            "max_sog": 0.90000000000000002220446049250313080847263336181640625
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-08-30T14:01:01+00:00",
        "end": "2026-08-30T20:12:27+00:00"
    },
    "points_count": {
        "vessel_a": 16,
        "vessel_b": 16
    },
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "score": {
        "value": 82,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 283m, avg 286m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 371 minutes"
            },
            "speed_stability": {
                "score": 17,
                "max": 20,
                "detail": "both nearly stationary; 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: Ust-Luga\/St. Petersburg Approach"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (EUROSTAR 4 MARIA and SGV FLOT) maintained close proximity (min 283m, avg 286m) for 371 minutes. Both vessels were slow-moving (avg speeds 0.4 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Ust-Luga\/St. Petersburg Approach, a known STS activity area."
    }
}
Methodology: 2026.01.18
Sts Ust-Luga/St. Petersburg Approach
Aug 30, 2026 13:06 UTC 82/100 ▼
Vessel A: MMSI 273353550 (EUROSTAR 4 MARIA) RUSSIA
Vessel B: IMO 8033089 (SGV FLOT) Russia
  • Minimum Distance: 283 meters
  • Average Distance: 286 meters
  • Duration: 5h 39m
  • Period: 2026-08-30T13:52:50+00:00 to 2026-08-30T19:32:38+00:00
  • Vessel A Avg Speed: 0.3 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Ust-Luga/St. Petersburg Approach

Confidence Analysis

Score: 82/100

High-confidence STS candidate. Two tankers (EUROSTAR 4 MARIA and SGV FLOT) maintained close proximity (min 283m, avg 286m) for 340 minutes. Both vessels were slow-moving (avg speeds 0.3 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Ust-Luga/St. Petersburg Approach, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness15/25Min distance 283m, avg 286m
Duration25/25Duration 340 minutes
Speed Stability17/20both nearly stationary; stable speeds
Distance Consistency15/15Distance variance ±3m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Ust-Luga/St. Petersburg Approach
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273353550,
        "name": "EUROSTAR 4 MARIA",
        "flag": "RUSSIA"
    },
    "vessel_b": {
        "mmsi": 273458830,
        "imo": 8033089,
        "name": "SGV FLOT",
        "flag": "Russia"
    },
    "min_distance_m": 283,
    "avg_distance_m": 286.3999999999999772626324556767940521240234375,
    "distance_consistency_m": 2.600000000000000088817841970012523233890533447265625,
    "duration_minutes": 339.80000000000001136868377216160297393798828125,
    "overlap_duration_s": 20388,
    "speed_a_avg": 0.340000000000000024424906541753443889319896697998046875,
    "speed_a_std": 0.330000000000000015543122344752191565930843353271484375,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.340000000000000024424906541753443889319896697998046875,
            "max_sog": 0.90000000000000002220446049250313080847263336181640625
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-08-30T13:52:50+00:00",
        "end": "2026-08-30T19:32:38+00:00"
    },
    "points_count": {
        "vessel_a": 13,
        "vessel_b": 13
    },
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "score": {
        "value": 82,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 283m, avg 286m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 340 minutes"
            },
            "speed_stability": {
                "score": 17,
                "max": 20,
                "detail": "both nearly stationary; 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: Ust-Luga\/St. Petersburg Approach"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (EUROSTAR 4 MARIA and SGV FLOT) maintained close proximity (min 283m, avg 286m) for 340 minutes. Both vessels were slow-moving (avg speeds 0.3 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Ust-Luga\/St. Petersburg Approach, a known STS activity area."
    }
}
Methodology: 2026.01.18
Zone Dwell Ust-Luga/St. Petersburg Approach
Aug 30, 2026 13:06 UTC 80.0% ▼
  • Zone: Ust-Luga/St. Petersburg Approach
  • Duration: 6h 32m
  • Data Points: 69 AIS positions
  • Period: 2026-08-30T13:55:11+00:00 to 2026-08-30T20:28:06+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 392.8999999999999772626324556767940521240234375,
    "points_in_zone": 69,
    "first_point": {
        "ts": "2026-08-30T13:55:11+00:00",
        "lat": 59.87689999999999912461134954355657100677490234375,
        "lon": 30.21809999999999973852027324028313159942626953125
    },
    "last_point": {
        "ts": "2026-08-30T20:28:06+00:00",
        "lat": 59.87691670000000243589965975843369960784912109375,
        "lon": 30.218116699999999497094904654659330844879150390625
    }
}
Methodology: 2026.01.18
Loiter Ust-Luga/St. Petersburg Approach
Aug 30, 2026 13:06 UTC 75.0% ▼
  • Duration: 6h 32m
  • Radius: 3 meters
  • Data Points: 69 AIS positions
  • Centroid: 59.8769, 30.2181
  • Zone: Ust-Luga/St. Petersburg Approach
Show Raw Evidence JSON
{
    "radius_m": 3.399999999999999911182158029987476766109466552734375,
    "duration_minutes": 392.8999999999999772626324556767940521240234375,
    "points": 69,
    "centroid": {
        "lat": 59.87690580434786369323774124495685100555419921875,
        "lon": 30.218091542028989948676098720170557498931884765625
    },
    "bbox": {
        "min_lat": 59.876883300000002918750396929681301116943359375,
        "min_lon": 30.218050000000001631406121305190026760101318359375,
        "max_lat": 59.87693329999999747315087006427347660064697265625,
        "max_lon": 30.218133300000001639773472561500966548919677734375
    },
    "zone_id": "russia_ust_luga_approach"
}
Methodology: 2026.01.18
Sts Ust-Luga/St. Petersburg Approach
Aug 30, 2026 12:32 UTC 95/100 ▼
Vessel A: Thoth (THOTH) Russia
Vessel B: IMO 8033089 (SGV FLOT) Russia
  • Minimum Distance: 90 meters
  • Average Distance: 123 meters
  • Duration: 5h 1m
  • Period: 2026-08-30T12:58:41+00:00 to 2026-08-30T17:59:51+00:00
  • Vessel A Avg Speed: 0.1 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Ust-Luga/St. Petersburg Approach

Confidence Analysis

Score: 95/100

High-confidence STS candidate. Two tankers (THOTH and SGV FLOT) maintained close proximity (min 90m, avg 123m) for 301 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 Ust-Luga/St. Petersburg Approach, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness25/25Min distance 90m, avg 123m
Duration25/25Duration 301 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±9m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Ust-Luga/St. Petersburg Approach
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273253080,
        "imo": 9164718,
        "name": "THOTH",
        "flag": "Russia"
    },
    "vessel_b": {
        "mmsi": 273458830,
        "imo": 8033089,
        "name": "SGV FLOT",
        "flag": "Russia"
    },
    "min_distance_m": 90.099999999999994315658113919198513031005859375,
    "avg_distance_m": 122.900000000000005684341886080801486968994140625,
    "distance_consistency_m": 9.300000000000000710542735760100185871124267578125,
    "duration_minutes": 301.19999999999998863131622783839702606201171875,
    "overlap_duration_s": 18070,
    "speed_a_avg": 0.08000000000000000166533453693773481063544750213623046875,
    "speed_a_std": 0.2600000000000000088817841970012523233890533447265625,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.08000000000000000166533453693773481063544750213623046875,
            "max_sog": 1.100000000000000088817841970012523233890533447265625
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-08-30T12:58:41+00:00",
        "end": "2026-08-30T17:59:51+00:00"
    },
    "points_count": {
        "vessel_a": 18,
        "vessel_b": 18
    },
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "score": {
        "value": 95,
        "components": {
            "distance_tightness": {
                "score": 25,
                "max": 25,
                "detail": "Min distance 90m, avg 123m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 301 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b19m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Ust-Luga\/St. Petersburg Approach"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (THOTH and SGV FLOT) maintained close proximity (min 90m, avg 123m) for 301 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 Ust-Luga\/St. Petersburg Approach, a known STS activity area."
    }
}
Methodology: 2026.01.18
Zone Dwell Ust-Luga/St. Petersburg Approach
Aug 30, 2026 12:02 UTC 80.0% ▼
  • Zone: Ust-Luga/St. Petersburg Approach
  • Duration: 6h 34m
  • Data Points: 64 AIS positions
  • Period: 2026-08-30T12:52:57+00:00 to 2026-08-30T19:27:38+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 394.69999999999998863131622783839702606201171875,
    "points_in_zone": 64,
    "first_point": {
        "ts": "2026-08-30T12:52:57+00:00",
        "lat": 59.876883300000002918750396929681301116943359375,
        "lon": 30.218083299999999979945641825906932353973388671875
    },
    "last_point": {
        "ts": "2026-08-30T19:27:38+00:00",
        "lat": 59.87691670000000243589965975843369960784912109375,
        "lon": 30.21806670000000138998075271956622600555419921875
    }
}
Methodology: 2026.01.18
Loiter Ust-Luga/St. Petersburg Approach
Aug 30, 2026 12:02 UTC 75.0% ▼
  • Duration: 6h 34m
  • Radius: 4 meters
  • Data Points: 64 AIS positions
  • Centroid: 59.8769, 30.2181
  • Zone: Ust-Luga/St. Petersburg Approach
Show Raw Evidence JSON
{
    "radius_m": 3.70000000000000017763568394002504646778106689453125,
    "duration_minutes": 394.69999999999998863131622783839702606201171875,
    "points": 64,
    "centroid": {
        "lat": 59.8769031265625386595274903811514377593994140625,
        "lon": 30.21809218281250508653101860545575618743896484375
    },
    "bbox": {
        "min_lat": 59.876883300000002918750396929681301116943359375,
        "min_lon": 30.218050000000001631406121305190026760101318359375,
        "max_lat": 59.87693329999999747315087006427347660064697265625,
        "max_lon": 30.218133300000001639773472561500966548919677734375
    },
    "zone_id": "russia_ust_luga_approach"
}
Methodology: 2026.01.18
Sts Ust-Luga/St. Petersburg Approach
Aug 30, 2026 11:24 UTC 95/100 ▼
Vessel A: Thoth (THOTH) Russia
Vessel B: IMO 8033089 (SGV FLOT) Russia
  • Minimum Distance: 90 meters
  • Average Distance: 124 meters
  • Duration: 6h 4m
  • Period: 2026-08-30T11:55:20+00:00 to 2026-08-30T17:59:51+00:00
  • Vessel A Avg Speed: 0.1 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Ust-Luga/St. Petersburg Approach

Confidence Analysis

Score: 95/100

High-confidence STS candidate. Two tankers (THOTH and SGV FLOT) maintained close proximity (min 90m, avg 124m) for 364 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 Ust-Luga/St. Petersburg Approach, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness25/25Min distance 90m, avg 124m
Duration25/25Duration 364 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±8m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Ust-Luga/St. Petersburg Approach
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273253080,
        "imo": 9164718,
        "name": "THOTH",
        "flag": "Russia"
    },
    "vessel_b": {
        "mmsi": 273458830,
        "imo": 8033089,
        "name": "SGV FLOT",
        "flag": "Russia"
    },
    "min_distance_m": 90.099999999999994315658113919198513031005859375,
    "avg_distance_m": 123.7999999999999971578290569595992565155029296875,
    "distance_consistency_m": 8.199999999999999289457264239899814128875732421875,
    "duration_minutes": 364.5,
    "overlap_duration_s": 21871,
    "speed_a_avg": 0.059999999999999997779553950749686919152736663818359375,
    "speed_a_std": 0.2300000000000000099920072216264088638126850128173828125,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.059999999999999997779553950749686919152736663818359375,
            "max_sog": 1.100000000000000088817841970012523233890533447265625
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-08-30T11:55:20+00:00",
        "end": "2026-08-30T17:59:51+00:00"
    },
    "points_count": {
        "vessel_a": 24,
        "vessel_b": 24
    },
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "score": {
        "value": 95,
        "components": {
            "distance_tightness": {
                "score": 25,
                "max": 25,
                "detail": "Min distance 90m, avg 124m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 364 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b18m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Ust-Luga\/St. Petersburg Approach"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (THOTH and SGV FLOT) maintained close proximity (min 90m, avg 124m) for 364 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 Ust-Luga\/St. Petersburg Approach, a known STS activity area."
    }
}
Methodology: 2026.01.18
Zone Dwell Ust-Luga/St. Petersburg Approach
Aug 30, 2026 11:02 UTC 80.0% ▼
  • Zone: Ust-Luga/St. Petersburg Approach
  • Duration: 6h 34m
  • Data Points: 63 AIS positions
  • Period: 2026-08-30T11:53:24+00:00 to 2026-08-30T18:28:12+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 394.80000000000001136868377216160297393798828125,
    "points_in_zone": 63,
    "first_point": {
        "ts": "2026-08-30T11:53:24+00:00",
        "lat": 59.87689999999999912461134954355657100677490234375,
        "lon": 30.21809999999999973852027324028313159942626953125
    },
    "last_point": {
        "ts": "2026-08-30T18:28:12+00:00",
        "lat": 59.87691670000000243589965975843369960784912109375,
        "lon": 30.21806670000000138998075271956622600555419921875
    }
}
Methodology: 2026.01.18
Loiter Ust-Luga/St. Petersburg Approach
Aug 30, 2026 11:02 UTC 75.0% ▼
  • Duration: 6h 34m
  • Radius: 4 meters
  • Data Points: 63 AIS positions
  • Centroid: 59.8769, 30.2181
  • Zone: Ust-Luga/St. Petersburg Approach
Show Raw Evidence JSON
{
    "radius_m": 3.600000000000000088817841970012523233890533447265625,
    "duration_minutes": 394.80000000000001136868377216160297393798828125,
    "points": 63,
    "centroid": {
        "lat": 59.87690158730162437450417201034724712371826171875,
        "lon": 30.218093911111122196189171518199145793914794921875
    },
    "bbox": {
        "min_lat": 59.876883300000002918750396929681301116943359375,
        "min_lon": 30.218050000000001631406121305190026760101318359375,
        "max_lat": 59.87693329999999747315087006427347660064697265625,
        "max_lon": 30.218116699999999497094904654659330844879150390625
    },
    "zone_id": "russia_ust_luga_approach"
}
Methodology: 2026.01.18
Sts Ust-Luga/St. Petersburg Approach
Aug 30, 2026 10:13 UTC 90/100 ▼
Vessel A: Thoth (THOTH) Russia
Vessel B: IMO 8033089 (SGV FLOT) Russia
  • Minimum Distance: 124 meters
  • Average Distance: 126 meters
  • Duration: 4h 58m
  • Period: 2026-08-30T10:18:11+00:00 to 2026-08-30T15:16:41+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Ust-Luga/St. Petersburg Approach

Confidence Analysis

Score: 90/100

High-confidence STS candidate. Two tankers (THOTH and SGV FLOT) maintained close proximity (min 124m, avg 126m) for 298 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 Ust-Luga/St. Petersburg Approach, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness20/25Min distance 124m, avg 126m
Duration25/25Duration 298 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±1m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Ust-Luga/St. Petersburg Approach
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273253080,
        "imo": 9164718,
        "name": "THOTH",
        "flag": "Russia"
    },
    "vessel_b": {
        "mmsi": 273458830,
        "imo": 8033089,
        "name": "SGV FLOT",
        "flag": "Russia"
    },
    "min_distance_m": 123.7999999999999971578290569595992565155029296875,
    "avg_distance_m": 126.2000000000000028421709430404007434844970703125,
    "distance_consistency_m": 1.100000000000000088817841970012523233890533447265625,
    "duration_minutes": 298.5,
    "overlap_duration_s": 17910,
    "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": "2026-08-30T10:18:11+00:00",
        "end": "2026-08-30T15:16:41+00:00"
    },
    "points_count": {
        "vessel_a": 35,
        "vessel_b": 35
    },
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "score": {
        "value": 90,
        "components": {
            "distance_tightness": {
                "score": 20,
                "max": 25,
                "detail": "Min distance 124m, avg 126m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 298 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: Ust-Luga\/St. Petersburg Approach"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (THOTH and SGV FLOT) maintained close proximity (min 124m, avg 126m) for 298 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 Ust-Luga\/St. Petersburg Approach, a known STS activity area."
    }
}
Methodology: 2026.01.18
Zone Dwell Ust-Luga/St. Petersburg Approach
Aug 30, 2026 10:00 UTC 80.0% ▼
  • Zone: Ust-Luga/St. Petersburg Approach
  • Duration: 6h 30m
  • Data Points: 60 AIS positions
  • Period: 2026-08-30T10:50:15+00:00 to 2026-08-30T17:20:17+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 390,
    "points_in_zone": 60,
    "first_point": {
        "ts": "2026-08-30T10:50:15+00:00",
        "lat": 59.87689999999999912461134954355657100677490234375,
        "lon": 30.21809999999999973852027324028313159942626953125
    },
    "last_point": {
        "ts": "2026-08-30T17:20:17+00:00",
        "lat": 59.87689999999999912461134954355657100677490234375,
        "lon": 30.21809999999999973852027324028313159942626953125
    }
}
Methodology: 2026.01.18
Loiter Ust-Luga/St. Petersburg Approach
Aug 30, 2026 10:00 UTC 75.0% ▼
  • Duration: 6h 30m
  • Radius: 3 meters
  • Data Points: 60 AIS positions
  • Centroid: 59.8769, 30.2181
  • Zone: Ust-Luga/St. Petersburg Approach
Show Raw Evidence JSON
{
    "radius_m": 3.20000000000000017763568394002504646778106689453125,
    "duration_minutes": 390,
    "points": 60,
    "centroid": {
        "lat": 59.8768997216667031580072944052517414093017578125,
        "lon": 30.218095551666689146941280341707170009613037109375
    },
    "bbox": {
        "min_lat": 59.876883300000002918750396929681301116943359375,
        "min_lon": 30.218050000000001631406121305190026760101318359375,
        "max_lat": 59.87691670000000243589965975843369960784912109375,
        "max_lon": 30.218116699999999497094904654659330844879150390625
    },
    "zone_id": "russia_ust_luga_approach"
}
Methodology: 2026.01.18
Sts Ust-Luga/St. Petersburg Approach
Aug 30, 2026 09:17 UTC 90/100 ▼
Vessel A: Thoth (THOTH) Russia
Vessel B: IMO 8033089 (SGV FLOT) Russia
  • Minimum Distance: 124 meters
  • Average Distance: 126 meters
  • Duration: 5h 59m
  • Period: 2026-08-30T09:17:20+00:00 to 2026-08-30T15:16:41+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Ust-Luga/St. Petersburg Approach

Confidence Analysis

Score: 90/100

High-confidence STS candidate. Two tankers (THOTH and SGV FLOT) maintained close proximity (min 124m, avg 126m) for 359 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 Ust-Luga/St. Petersburg Approach, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness20/25Min distance 124m, avg 126m
Duration25/25Duration 359 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±1m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Ust-Luga/St. Petersburg Approach
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273253080,
        "imo": 9164718,
        "name": "THOTH",
        "flag": "Russia"
    },
    "vessel_b": {
        "mmsi": 273458830,
        "imo": 8033089,
        "name": "SGV FLOT",
        "flag": "Russia"
    },
    "min_distance_m": 123.7999999999999971578290569595992565155029296875,
    "avg_distance_m": 126.2000000000000028421709430404007434844970703125,
    "distance_consistency_m": 1,
    "duration_minutes": 359.3999999999999772626324556767940521240234375,
    "overlap_duration_s": 21561,
    "speed_a_avg": 0,
    "speed_a_std": 0,
    "speed_b_avg": 0,
    "speed_b_std": 0.0200000000000000004163336342344337026588618755340576171875,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0,
            "max_sog": 0
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0.1000000000000000055511151231257827021181583404541015625
        }
    },
    "time_window": {
        "start": "2026-08-30T09:17:20+00:00",
        "end": "2026-08-30T15:16:41+00:00"
    },
    "points_count": {
        "vessel_a": 43,
        "vessel_b": 43
    },
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "score": {
        "value": 90,
        "components": {
            "distance_tightness": {
                "score": 20,
                "max": 25,
                "detail": "Min distance 124m, avg 126m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 359 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: Ust-Luga\/St. Petersburg Approach"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (THOTH and SGV FLOT) maintained close proximity (min 124m, avg 126m) for 359 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 Ust-Luga\/St. Petersburg Approach, a known STS activity area."
    }
}
Methodology: 2026.01.18
Zone Dwell Ust-Luga/St. Petersburg Approach
Aug 30, 2026 09:13 UTC 80.0% ▼
  • Zone: Ust-Luga/St. Petersburg Approach
  • Duration: 6h 36m
  • Data Points: 59 AIS positions
  • Period: 2026-08-30T09:52:32+00:00 to 2026-08-30T16:29:16+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 396.69999999999998863131622783839702606201171875,
    "points_in_zone": 59,
    "first_point": {
        "ts": "2026-08-30T09:52:32+00:00",
        "lat": 59.87686670000000077607182902283966541290283203125,
        "lon": 30.218116699999999497094904654659330844879150390625
    },
    "last_point": {
        "ts": "2026-08-30T16:29:16+00:00",
        "lat": 59.87689999999999912461134954355657100677490234375,
        "lon": 30.218083299999999979945641825906932353973388671875
    }
}
Methodology: 2026.01.18

Recent Position Data

Time (UTC) Lat Lon Speed Course Zone
Sep 5 00:45 59.5180 22.5804 6.3 kn 252.2° discovered_008
Sep 5 00:20 59.5318 22.6637 6.3 kn 253.0° discovered_008
Sep 5 00:17 59.5331 22.6728 6.3 kn 252.1° discovered_008
Sep 5 00:14 59.5347 22.6835 6.4 kn 253.9° discovered_008
Sep 5 00:10 59.5366 22.6958 6.4 kn 253.6° discovered_008
Sep 5 00:06 59.5387 22.7100 6.4 kn 254.5° discovered_008
Sep 5 00:04 59.5397 22.7167 6.4 kn 254.9° discovered_008
Sep 5 00:01 59.5413 22.7280 6.4 kn 253.6° discovered_008
Sep 4 23:59 59.5421 22.7332 6.5 kn 253.1° discovered_008
Sep 4 23:56 59.5437 22.7441 6.5 kn 253.5° discovered_008
Sep 4 23:54 59.5447 22.7511 6.5 kn 253.3° discovered_008
Sep 4 23:52 59.5460 22.7591 6.5 kn 253.3° discovered_008
Sep 4 23:50 59.5470 22.7660 6.5 kn 251.2° discovered_008
Sep 4 23:48 59.5479 22.7710 6.5 kn 252.2° discovered_008
Sep 4 23:45 59.5496 22.7818 6.5 kn 252.0° discovered_008
Sep 4 23:43 59.5511 22.7910 6.5 kn 253.1° discovered_008
Sep 4 23:41 59.5522 22.7978 6.4 kn 251.8° discovered_008
Sep 4 23:38 59.5535 22.8056 6.4 kn 253.4° discovered_008
Sep 4 23:36 59.5549 22.8140 6.4 kn 253.5° discovered_008
Sep 4 23:33 59.5566 22.8247 6.4 kn 253.1° discovered_008

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.