WECO MADELEINE

IMO 9693824

Vessel information

Vessel Name WECO MADELEINE
IMO Number 9693824
MMSI 636093045
Vessel Type Tanker
Flag 🇱🇷 LIBERIA
Call Sign 5LCM2
Length 184 m
Beam 32 m

Detected Events (100)

Zone Dwell Northern Baltic Sea Surveillance Zone
Jul 24, 2026 01:25 UTC 80.0% ▼
  • Zone: Northern Baltic Sea Surveillance Zone
  • Duration: 1h 10m
  • Data Points: 14 AIS positions
  • Period: 2026-07-24T01:25:06+00:00 to 2026-07-24T02:35:25+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_078",
    "zone_name": "Central Mediterranean Sanctions Monitoring Zone",
    "dwell_minutes": 70.2999999999999971578290569595992565155029296875,
    "points_in_zone": 14,
    "first_point": {
        "ts": "2026-07-24T01:25:06+00:00",
        "lat": -34.5333499999999986584953148849308490753173828125,
        "lon": 18.208833299999998445173332584090530872344970703125
    },
    "last_point": {
        "ts": "2026-07-24T02:35:25+00:00",
        "lat": -34.63701669999999666060830350033938884735107421875,
        "lon": 18.443266699999998792236510780639946460723876953125
    }
}
Methodology: 2026.01.18
Zone Dwell discovered_079
Jul 23, 2026 21:01 UTC 80.0% ▼
  • Zone: discovered_079
  • Duration: 2h 3m
  • Data Points: 26 AIS positions
  • Period: 2026-07-23T21:01:06+00:00 to 2026-07-23T23:04:16+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_079",
    "zone_name": "Atlantic Midway Monitoring Zone",
    "dwell_minutes": 123.2000000000000028421709430404007434844970703125,
    "points_in_zone": 26,
    "first_point": {
        "ts": "2026-07-23T21:01:06+00:00",
        "lat": -33.87178329999999704114088672213256359100341796875,
        "lon": 18.314866699999999610781742376275360584259033203125
    },
    "last_point": {
        "ts": "2026-07-23T23:04:16+00:00",
        "lat": -34.10646669999999858191586099565029144287109375,
        "lon": 18.182050000000000267164068645797669887542724609375
    }
}
Methodology: 2026.01.18
Zone Dwell discovered_079
Jul 23, 2026 20:01 UTC 80.0% ▼
  • Zone: discovered_079
  • Duration: 3h 2m
  • Data Points: 43 AIS positions
  • Period: 2026-07-23T20:01:26+00:00 to 2026-07-23T23:04:16+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_079",
    "zone_name": "Atlantic Midway Monitoring Zone",
    "dwell_minutes": 182.80000000000001136868377216160297393798828125,
    "points_in_zone": 43,
    "first_point": {
        "ts": "2026-07-23T20:01:26+00:00",
        "lat": -33.88751669999999904803189565427601337432861328125,
        "lon": 18.267133300000001128182702814228832721710205078125
    },
    "last_point": {
        "ts": "2026-07-23T23:04:16+00:00",
        "lat": -34.10646669999999858191586099565029144287109375,
        "lon": 18.182050000000000267164068645797669887542724609375
    }
}
Methodology: 2026.01.18
Zone Dwell discovered_079
Jul 23, 2026 19:01 UTC 80.0% ▼
  • Zone: discovered_079
  • Duration: 4h 2m
  • Data Points: 60 AIS positions
  • Period: 2026-07-23T19:01:26+00:00 to 2026-07-23T23:04:16+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_079",
    "zone_name": "Atlantic Midway Monitoring Zone",
    "dwell_minutes": 242.80000000000001136868377216160297393798828125,
    "points_in_zone": 60,
    "first_point": {
        "ts": "2026-07-23T19:01:26+00:00",
        "lat": -33.897300000000001318767317570745944976806640625,
        "lon": 18.171283299999998916973709128797054290771484375
    },
    "last_point": {
        "ts": "2026-07-23T23:04:16+00:00",
        "lat": -34.10646669999999858191586099565029144287109375,
        "lon": 18.182050000000000267164068645797669887542724609375
    }
}
Methodology: 2026.01.18
Zone Dwell discovered_079
Jul 23, 2026 18:41 UTC 80.0% ▼
  • Zone: discovered_079
  • Duration: 4h 23m
  • Data Points: 64 AIS positions
  • Period: 2026-07-23T18:41:06+00:00 to 2026-07-23T23:04:16+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_079",
    "zone_name": "Atlantic Midway Monitoring Zone",
    "dwell_minutes": 263.19999999999998863131622783839702606201171875,
    "points_in_zone": 64,
    "first_point": {
        "ts": "2026-07-23T18:41:06+00:00",
        "lat": -33.86073329999999970141288940794765949249267578125,
        "lon": 18.10591670000000164009179570712149143218994140625
    },
    "last_point": {
        "ts": "2026-07-23T23:04:16+00:00",
        "lat": -34.10646669999999858191586099565029144287109375,
        "lon": 18.182050000000000267164068645797669887542724609375
    }
}
Methodology: 2026.01.18
Zone Dwell discovered_010
Apr 26, 2026 22:02 UTC 80.0% ▼
  • Zone: discovered_010
  • Duration: 1 hours
  • Data Points: 16 AIS positions
  • Period: 2026-04-26T22:02:33+00:00 to 2026-04-26T23:03:24+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_010",
    "zone_name": "Western Mediterranean Sanctioned Vessel Zone",
    "dwell_minutes": 60.89999999999999857891452847979962825775146484375,
    "points_in_zone": 16,
    "first_point": {
        "ts": "2026-04-26T22:02:33+00:00",
        "lat": 36.10853329999999772326191305182874202728271484375,
        "lon": -8.9563167000000003525883585098199546337127685546875
    },
    "last_point": {
        "ts": "2026-04-26T23:03:24+00:00",
        "lat": 36.19893330000000020163497538305819034576416015625,
        "lon": -9.203900000000000858335624798201024532318115234375
    }
}
Methodology: 2026.01.18
Zone Dwell discovered_010
Apr 26, 2026 21:09 UTC 80.0% ▼
  • Zone: discovered_010
  • Duration: 1h 54m
  • Data Points: 25 AIS positions
  • Period: 2026-04-26T21:09:22+00:00 to 2026-04-26T23:03:24+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_010",
    "zone_name": "Western Mediterranean Sanctioned Vessel Zone",
    "dwell_minutes": 114,
    "points_in_zone": 25,
    "first_point": {
        "ts": "2026-04-26T21:09:22+00:00",
        "lat": 36.03006669999999900255716056562960147857666015625,
        "lon": -8.7408500000000000085265128291212022304534912109375
    },
    "last_point": {
        "ts": "2026-04-26T23:03:24+00:00",
        "lat": 36.19893330000000020163497538305819034576416015625,
        "lon": -9.203900000000000858335624798201024532318115234375
    }
}
Methodology: 2026.01.18
Zone Dwell discovered_010
Apr 26, 2026 20:28 UTC 80.0% ▼
  • Zone: discovered_010
  • Duration: 2h 34m
  • Data Points: 41 AIS positions
  • Period: 2026-04-26T20:28:44+00:00 to 2026-04-26T23:03:24+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_010",
    "zone_name": "Western Mediterranean Sanctioned Vessel Zone",
    "dwell_minutes": 154.69999999999998863131622783839702606201171875,
    "points_in_zone": 41,
    "first_point": {
        "ts": "2026-04-26T20:28:44+00:00",
        "lat": 35.97628329999999863275661482475697994232177734375,
        "lon": -8.5784000000000002472688720445148646831512451171875
    },
    "last_point": {
        "ts": "2026-04-26T23:03:24+00:00",
        "lat": 36.19893330000000020163497538305819034576416015625,
        "lon": -9.203900000000000858335624798201024532318115234375
    }
}
Methodology: 2026.01.18
Zone Dwell Istanbul Black Sea Surveillance Zone
Apr 8, 2026 05:07 UTC 80.0% ▼
  • Zone: Istanbul Black Sea Surveillance Zone
  • Duration: 1h 50m
  • Data Points: 31 AIS positions
  • Period: 2026-04-08T05:07:23+00:00 to 2026-04-08T06:57:56+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_029",
    "zone_name": "Eastern Mediterranean Sanctions Monitoring Zone",
    "dwell_minutes": 110.5,
    "points_in_zone": 31,
    "first_point": {
        "ts": "2026-04-08T05:07:23+00:00",
        "lat": 34.7081333000000000765794538892805576324462890625,
        "lon": 33.31996670000000193567757378332316875457763671875
    },
    "last_point": {
        "ts": "2026-04-08T06:57:56+00:00",
        "lat": 34.70036669999999645597199560143053531646728515625,
        "lon": 33.30879999999999796500560478307306766510009765625
    }
}
Methodology: 2026.01.18
Loiter Istanbul Black Sea Surveillance Zone
Apr 8, 2026 05:07 UTC 75.0% ▼
  • Duration: 1h 48m
  • Radius: 848 meters
  • Data Points: 30 AIS positions
  • Centroid: 34.7077, 33.3191
  • Zone: Istanbul Black Sea Surveillance Zone
Show Raw Evidence JSON
{
    "radius_m": 848.299999999999954525264911353588104248046875,
    "duration_minutes": 108.5,
    "points": 30,
    "centroid": {
        "lat": 34.7077210966666598324081860482692718505859375,
        "lon": 33.319063913333337723088334314525127410888671875
    },
    "bbox": {
        "min_lat": 34.70368330000000156587702804245054721832275390625,
        "min_lon": 33.3111999999999994770405464805662631988525390625,
        "max_lat": 34.70824999999999960209606797434389591217041015625,
        "max_lon": 33.31996670000000193567757378332316875457763671875
    },
    "zone_id": "discovered_029"
}
Methodology: 2026.01.18
Zone Dwell Istanbul Black Sea Surveillance Zone
Apr 8, 2026 04:07 UTC 80.0% ▼
  • Zone: Istanbul Black Sea Surveillance Zone
  • Duration: 2h 50m
  • Data Points: 45 AIS positions
  • Period: 2026-04-08T04:07:20+00:00 to 2026-04-08T06:57:56+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_029",
    "zone_name": "Eastern Mediterranean Sanctions Monitoring Zone",
    "dwell_minutes": 170.599999999999994315658113919198513031005859375,
    "points_in_zone": 45,
    "first_point": {
        "ts": "2026-04-08T04:07:20+00:00",
        "lat": 34.7081500000000033878677641041576862335205078125,
        "lon": 33.31994999999999862438926356844604015350341796875
    },
    "last_point": {
        "ts": "2026-04-08T06:57:56+00:00",
        "lat": 34.70036669999999645597199560143053531646728515625,
        "lon": 33.30879999999999796500560478307306766510009765625
    }
}
Methodology: 2026.01.18
Loiter Istanbul Black Sea Surveillance Zone
Apr 8, 2026 04:07 UTC 75.0% ▼
  • Duration: 2h 48m
  • Radius: 878 meters
  • Data Points: 44 AIS positions
  • Centroid: 34.7079, 33.3193
  • Zone: Istanbul Black Sea Surveillance Zone
Show Raw Evidence JSON
{
    "radius_m": 878.3999999999999772626324556767940521240234375,
    "duration_minutes": 168.599999999999994315658113919198513031005859375,
    "points": 44,
    "centroid": {
        "lat": 34.7078549090909262986315297894179821014404296875,
        "lon": 33.3193488863636275709723122417926788330078125
    },
    "bbox": {
        "min_lat": 34.70368330000000156587702804245054721832275390625,
        "min_lon": 33.3111999999999994770405464805662631988525390625,
        "max_lat": 34.70824999999999960209606797434389591217041015625,
        "max_lon": 33.31996670000000193567757378332316875457763671875
    },
    "zone_id": "discovered_029"
}
Methodology: 2026.01.18
Zone Dwell Istanbul Black Sea Surveillance Zone
Apr 8, 2026 03:01 UTC 80.0% ▼
  • Zone: Istanbul Black Sea Surveillance Zone
  • Duration: 3h 56m
  • Data Points: 60 AIS positions
  • Period: 2026-04-08T03:01:18+00:00 to 2026-04-08T06:57:56+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_029",
    "zone_name": "Eastern Mediterranean Sanctions Monitoring Zone",
    "dwell_minutes": 236.599999999999994315658113919198513031005859375,
    "points_in_zone": 60,
    "first_point": {
        "ts": "2026-04-08T03:01:18+00:00",
        "lat": 34.7081500000000033878677641041576862335205078125,
        "lon": 33.31996670000000193567757378332316875457763671875
    },
    "last_point": {
        "ts": "2026-04-08T06:57:56+00:00",
        "lat": 34.70036669999999645597199560143053531646728515625,
        "lon": 33.30879999999999796500560478307306766510009765625
    }
}
Methodology: 2026.01.18
Loiter Istanbul Black Sea Surveillance Zone
Apr 8, 2026 03:01 UTC 75.0% ▼
  • Duration: 3h 54m
  • Radius: 895 meters
  • Data Points: 59 AIS positions
  • Centroid: 34.7079, 33.3195
  • Zone: Istanbul Black Sea Surveillance Zone
Show Raw Evidence JSON
{
    "radius_m": 894.700000000000045474735088646411895751953125,
    "duration_minutes": 234.599999999999994315658113919198513031005859375,
    "points": 59,
    "centroid": {
        "lat": 34.70792993220339894833159632980823516845703125,
        "lon": 33.31950199491522113248720415867865085601806640625
    },
    "bbox": {
        "min_lat": 34.70368330000000156587702804245054721832275390625,
        "min_lon": 33.3111999999999994770405464805662631988525390625,
        "max_lat": 34.70824999999999960209606797434389591217041015625,
        "max_lon": 33.31996670000000193567757378332316875457763671875
    },
    "zone_id": "discovered_029"
}
Methodology: 2026.01.18
Zone Dwell Istanbul Black Sea Surveillance Zone
Apr 8, 2026 02:01 UTC 80.0% ▼
  • Zone: Istanbul Black Sea Surveillance Zone
  • Duration: 4h 56m
  • Data Points: 74 AIS positions
  • Period: 2026-04-08T02:01:21+00:00 to 2026-04-08T06:57:56+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_029",
    "zone_name": "Eastern Mediterranean Sanctions Monitoring Zone",
    "dwell_minutes": 296.6000000000000227373675443232059478759765625,
    "points_in_zone": 74,
    "first_point": {
        "ts": "2026-04-08T02:01:21+00:00",
        "lat": 34.7081500000000033878677641041576862335205078125,
        "lon": 33.31996670000000193567757378332316875457763671875
    },
    "last_point": {
        "ts": "2026-04-08T06:57:56+00:00",
        "lat": 34.70036669999999645597199560143053531646728515625,
        "lon": 33.30879999999999796500560478307306766510009765625
    }
}
Methodology: 2026.01.18
Loiter Istanbul Black Sea Surveillance Zone
Apr 8, 2026 02:01 UTC 75.0% ▼
  • Duration: 4h 54m
  • Radius: 904 meters
  • Data Points: 73 AIS positions
  • Centroid: 34.7080, 33.3196
  • Zone: Istanbul Black Sea Surveillance Zone
Show Raw Evidence JSON
{
    "radius_m": 904.1000000000000227373675443232059478759765625,
    "duration_minutes": 294.6000000000000227373675443232059478759765625,
    "points": 73,
    "centroid": {
        "lat": 34.70797213698632077694128383882343769073486328125,
        "lon": 33.31959111643831050741937360726296901702880859375
    },
    "bbox": {
        "min_lat": 34.70368330000000156587702804245054721832275390625,
        "min_lon": 33.3111999999999994770405464805662631988525390625,
        "max_lat": 34.70824999999999960209606797434389591217041015625,
        "max_lon": 33.31996670000000193567757378332316875457763671875
    },
    "zone_id": "discovered_029"
}
Methodology: 2026.01.18
Zone Dwell Istanbul Black Sea Surveillance Zone
Apr 8, 2026 01:07 UTC 80.0% ▼
  • Zone: Istanbul Black Sea Surveillance Zone
  • Duration: 5h 50m
  • Data Points: 87 AIS positions
  • Period: 2026-04-08T01:07:23+00:00 to 2026-04-08T06:57:56+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_029",
    "zone_name": "Eastern Mediterranean Sanctions Monitoring Zone",
    "dwell_minutes": 350.6000000000000227373675443232059478759765625,
    "points_in_zone": 87,
    "first_point": {
        "ts": "2026-04-08T01:07:23+00:00",
        "lat": 34.7081500000000033878677641041576862335205078125,
        "lon": 33.31996670000000193567757378332316875457763671875
    },
    "last_point": {
        "ts": "2026-04-08T06:57:56+00:00",
        "lat": 34.70036669999999645597199560143053531646728515625,
        "lon": 33.30879999999999796500560478307306766510009765625
    }
}
Methodology: 2026.01.18
Loiter Istanbul Black Sea Surveillance Zone
Apr 8, 2026 01:07 UTC 75.0% ▼
  • Duration: 5h 48m
  • Radius: 910 meters
  • Data Points: 86 AIS positions
  • Centroid: 34.7080, 33.3196
  • Zone: Istanbul Black Sea Surveillance Zone
Show Raw Evidence JSON
{
    "radius_m": 910.1000000000000227373675443232059478759765625,
    "duration_minutes": 348.5,
    "points": 86,
    "centroid": {
        "lat": 34.7079990232558230900394846685230731964111328125,
        "lon": 33.3196478906976523148841806687414646148681640625
    },
    "bbox": {
        "min_lat": 34.70368330000000156587702804245054721832275390625,
        "min_lon": 33.3111999999999994770405464805662631988525390625,
        "max_lat": 34.70824999999999960209606797434389591217041015625,
        "max_lon": 33.31996670000000193567757378332316875457763671875
    },
    "zone_id": "discovered_029"
}
Methodology: 2026.01.18
Zone Dwell Istanbul Black Sea Surveillance Zone
Apr 8, 2026 00:37 UTC 80.0% ▼
  • Zone: Istanbul Black Sea Surveillance Zone
  • Duration: 6h 20m
  • Data Points: 94 AIS positions
  • Period: 2026-04-08T00:37:18+00:00 to 2026-04-08T06:57:56+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_029",
    "zone_name": "Eastern Mediterranean Sanctions Monitoring Zone",
    "dwell_minutes": 380.6000000000000227373675443232059478759765625,
    "points_in_zone": 94,
    "first_point": {
        "ts": "2026-04-08T00:37:18+00:00",
        "lat": 34.7081500000000033878677641041576862335205078125,
        "lon": 33.31996670000000193567757378332316875457763671875
    },
    "last_point": {
        "ts": "2026-04-08T06:57:56+00:00",
        "lat": 34.70036669999999645597199560143053531646728515625,
        "lon": 33.30879999999999796500560478307306766510009765625
    }
}
Methodology: 2026.01.18
Loiter Istanbul Black Sea Surveillance Zone
Apr 8, 2026 00:37 UTC 75.0% ▼
  • Duration: 6h 18m
  • Radius: 913 meters
  • Data Points: 93 AIS positions
  • Centroid: 34.7080, 33.3197
  • Zone: Istanbul Black Sea Surveillance Zone
Show Raw Evidence JSON
{
    "radius_m": 912.6000000000000227373675443232059478759765625,
    "duration_minutes": 378.6000000000000227373675443232059478759765625,
    "points": 93,
    "centroid": {
        "lat": 34.708010387096777549231774173676967620849609375,
        "lon": 33.31967188709675298241563723422586917877197265625
    },
    "bbox": {
        "min_lat": 34.70368330000000156587702804245054721832275390625,
        "min_lon": 33.3111999999999994770405464805662631988525390625,
        "max_lat": 34.70824999999999960209606797434389591217041015625,
        "max_lon": 33.31996670000000193567757378332316875457763671875
    },
    "zone_id": "discovered_029"
}
Methodology: 2026.01.18
Zone Dwell Istanbul Black Sea Surveillance Zone
Apr 7, 2026 23:01 UTC 80.0% ▼
  • Zone: Istanbul Black Sea Surveillance Zone
  • Duration: 6h 33m
  • Data Points: 81 AIS positions
  • Period: 2026-04-07T23:25:19+00:00 to 2026-04-08T05:58:19+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_029",
    "zone_name": "Eastern Mediterranean Sanctions Monitoring Zone",
    "dwell_minutes": 393,
    "points_in_zone": 81,
    "first_point": {
        "ts": "2026-04-07T23:25:19+00:00",
        "lat": 34.7081500000000033878677641041576862335205078125,
        "lon": 33.31996670000000193567757378332316875457763671875
    },
    "last_point": {
        "ts": "2026-04-08T05:58:19+00:00",
        "lat": 34.7081333000000000765794538892805576324462890625,
        "lon": 33.31996670000000193567757378332316875457763671875
    }
}
Methodology: 2026.01.18
Loiter Istanbul Black Sea Surveillance Zone
Apr 7, 2026 23:01 UTC 75.0% ▼
  • Duration: 6h 33m
  • Radius: 2 meters
  • Data Points: 81 AIS positions
  • Centroid: 34.7081, 33.3200
  • Zone: Istanbul Black Sea Surveillance Zone
Show Raw Evidence JSON
{
    "radius_m": 1.600000000000000088817841970012523233890533447265625,
    "duration_minutes": 393,
    "points": 81,
    "centroid": {
        "lat": 34.708147525925909349098219536244869232177734375,
        "lon": 33.319962576543190380107262171804904937744140625
    },
    "bbox": {
        "min_lat": 34.7081333000000000765794538892805576324462890625,
        "min_lon": 33.31994999999999862438926356844604015350341796875,
        "max_lat": 34.7081500000000033878677641041576862335205078125,
        "max_lon": 33.31996670000000193567757378332316875457763671875
    },
    "zone_id": "discovered_029"
}
Methodology: 2026.01.18
Zone Dwell Istanbul Black Sea Surveillance Zone
Apr 7, 2026 22:01 UTC 80.0% ▼
  • Zone: Istanbul Black Sea Surveillance Zone
  • Duration: 6h 33m
  • Data Points: 79 AIS positions
  • Period: 2026-04-07T22:52:20+00:00 to 2026-04-08T05:25:20+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_029",
    "zone_name": "Eastern Mediterranean Sanctions Monitoring Zone",
    "dwell_minutes": 393,
    "points_in_zone": 79,
    "first_point": {
        "ts": "2026-04-07T22:52:20+00:00",
        "lat": 34.7081500000000033878677641041576862335205078125,
        "lon": 33.31996670000000193567757378332316875457763671875
    },
    "last_point": {
        "ts": "2026-04-08T05:25:20+00:00",
        "lat": 34.7081500000000033878677641041576862335205078125,
        "lon": 33.31996670000000193567757378332316875457763671875
    }
}
Methodology: 2026.01.18
Loiter Istanbul Black Sea Surveillance Zone
Apr 7, 2026 22:01 UTC 75.0% ▼
  • Duration: 6h 33m
  • Radius: 2 meters
  • Data Points: 79 AIS positions
  • Centroid: 34.7081, 33.3200
  • Zone: Istanbul Black Sea Surveillance Zone
Show Raw Evidence JSON
{
    "radius_m": 2.100000000000000088817841970012523233890533447265625,
    "duration_minutes": 393,
    "points": 79,
    "centroid": {
        "lat": 34.7081478860759347071507363580167293548583984375,
        "lon": 33.31996247215187878509823349304497241973876953125
    },
    "bbox": {
        "min_lat": 34.7081333000000000765794538892805576324462890625,
        "min_lon": 33.31994999999999862438926356844604015350341796875,
        "max_lat": 34.70816669999999959372871671803295612335205078125,
        "max_lon": 33.31996670000000193567757378332316875457763671875
    },
    "zone_id": "discovered_029"
}
Methodology: 2026.01.18
Zone Dwell Istanbul Black Sea Surveillance Zone
Apr 7, 2026 21:07 UTC 80.0% ▼
  • Zone: Istanbul Black Sea Surveillance Zone
  • Duration: 6h 33m
  • Data Points: 72 AIS positions
  • Period: 2026-04-07T21:52:21+00:00 to 2026-04-08T04:25:19+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_029",
    "zone_name": "Eastern Mediterranean Sanctions Monitoring Zone",
    "dwell_minutes": 393,
    "points_in_zone": 72,
    "first_point": {
        "ts": "2026-04-07T21:52:21+00:00",
        "lat": 34.7081333000000000765794538892805576324462890625,
        "lon": 33.31996670000000193567757378332316875457763671875
    },
    "last_point": {
        "ts": "2026-04-08T04:25:19+00:00",
        "lat": 34.7081500000000033878677641041576862335205078125,
        "lon": 33.31994999999999862438926356844604015350341796875
    }
}
Methodology: 2026.01.18
Loiter Istanbul Black Sea Surveillance Zone
Apr 7, 2026 21:07 UTC 75.0% ▼
  • Duration: 6h 33m
  • Radius: 2 meters
  • Data Points: 72 AIS positions
  • Centroid: 34.7082, 33.3200
  • Zone: Istanbul Black Sea Surveillance Zone
Show Raw Evidence JSON
{
    "radius_m": 1.899999999999999911182158029987476766109466552734375,
    "duration_minutes": 393,
    "points": 72,
    "centroid": {
        "lat": 34.70814999999996786073097609914839267730712890625,
        "lon": 33.3199620611110987056235899217426776885986328125
    },
    "bbox": {
        "min_lat": 34.7081333000000000765794538892805576324462890625,
        "min_lon": 33.31994999999999862438926356844604015350341796875,
        "max_lat": 34.70816669999999959372871671803295612335205078125,
        "max_lon": 33.31996670000000193567757378332316875457763671875
    },
    "zone_id": "discovered_029"
}
Methodology: 2026.01.18
Zone Dwell Istanbul Black Sea Surveillance Zone
Apr 7, 2026 20:04 UTC 80.0% ▼
  • Zone: Istanbul Black Sea Surveillance Zone
  • Duration: 6h 36m
  • Data Points: 69 AIS positions
  • Period: 2026-04-07T20:40:19+00:00 to 2026-04-08T03:16:20+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_029",
    "zone_name": "Eastern Mediterranean Sanctions Monitoring Zone",
    "dwell_minutes": 396,
    "points_in_zone": 69,
    "first_point": {
        "ts": "2026-04-07T20:40:19+00:00",
        "lat": 34.7081500000000033878677641041576862335205078125,
        "lon": 33.31996670000000193567757378332316875457763671875
    },
    "last_point": {
        "ts": "2026-04-08T03:16:20+00:00",
        "lat": 34.7081500000000033878677641041576862335205078125,
        "lon": 33.31994999999999862438926356844604015350341796875
    }
}
Methodology: 2026.01.18
Loiter Istanbul Black Sea Surveillance Zone
Apr 7, 2026 20:04 UTC 75.0% ▼
  • Duration: 6h 36m
  • Radius: 2 meters
  • Data Points: 69 AIS positions
  • Centroid: 34.7081, 33.3200
  • Zone: Istanbul Black Sea Surveillance Zone
Show Raw Evidence JSON
{
    "radius_m": 2.100000000000000088817841970012523233890533447265625,
    "duration_minutes": 396,
    "points": 69,
    "centroid": {
        "lat": 34.70814806376807837295928038656711578369140625,
        "lon": 33.31996573188401811194125912152230739593505859375
    },
    "bbox": {
        "min_lat": 34.7081333000000000765794538892805576324462890625,
        "min_lon": 33.31994999999999862438926356844604015350341796875,
        "max_lat": 34.70816669999999959372871671803295612335205078125,
        "max_lon": 33.31996670000000193567757378332316875457763671875
    },
    "zone_id": "discovered_029"
}
Methodology: 2026.01.18
Zone Dwell Istanbul Black Sea Surveillance Zone
Apr 7, 2026 19:01 UTC 80.0% ▼
  • Zone: Istanbul Black Sea Surveillance Zone
  • Duration: 6h 35m
  • Data Points: 71 AIS positions
  • Period: 2026-04-07T19:52:23+00:00 to 2026-04-08T02:28:17+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_029",
    "zone_name": "Eastern Mediterranean Sanctions Monitoring Zone",
    "dwell_minutes": 395.8999999999999772626324556767940521240234375,
    "points_in_zone": 71,
    "first_point": {
        "ts": "2026-04-07T19:52:23+00:00",
        "lat": 34.7081500000000033878677641041576862335205078125,
        "lon": 33.31996670000000193567757378332316875457763671875
    },
    "last_point": {
        "ts": "2026-04-08T02:28:17+00:00",
        "lat": 34.7081500000000033878677641041576862335205078125,
        "lon": 33.31996670000000193567757378332316875457763671875
    }
}
Methodology: 2026.01.18
Loiter Istanbul Black Sea Surveillance Zone
Apr 7, 2026 19:01 UTC 75.0% ▼
  • Duration: 6h 35m
  • Radius: 2 meters
  • Data Points: 71 AIS positions
  • Centroid: 34.7081, 33.3200
  • Zone: Istanbul Black Sea Surveillance Zone
Show Raw Evidence JSON
{
    "radius_m": 2.100000000000000088817841970012523233890533447265625,
    "duration_minutes": 395.8999999999999772626324556767940521240234375,
    "points": 71,
    "centroid": {
        "lat": 34.708148118309821938964887522161006927490234375,
        "lon": 33.319966933802760422622668556869029998779296875
    },
    "bbox": {
        "min_lat": 34.7081333000000000765794538892805576324462890625,
        "min_lon": 33.31996670000000193567757378332316875457763671875,
        "max_lat": 34.70816669999999959372871671803295612335205078125,
        "max_lon": 33.31998329999999697292878408916294574737548828125
    },
    "zone_id": "discovered_029"
}
Methodology: 2026.01.18
Zone Dwell Istanbul Black Sea Surveillance Zone
Apr 7, 2026 18:01 UTC 80.0% ▼
  • Zone: Istanbul Black Sea Surveillance Zone
  • Duration: 6h 32m
  • Data Points: 65 AIS positions
  • Period: 2026-04-07T18:52:22+00:00 to 2026-04-08T01:25:18+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_029",
    "zone_name": "Eastern Mediterranean Sanctions Monitoring Zone",
    "dwell_minutes": 392.8999999999999772626324556767940521240234375,
    "points_in_zone": 65,
    "first_point": {
        "ts": "2026-04-07T18:52:22+00:00",
        "lat": 34.7081500000000033878677641041576862335205078125,
        "lon": 33.31996670000000193567757378332316875457763671875
    },
    "last_point": {
        "ts": "2026-04-08T01:25:18+00:00",
        "lat": 34.7081500000000033878677641041576862335205078125,
        "lon": 33.31996670000000193567757378332316875457763671875
    }
}
Methodology: 2026.01.18
Loiter Istanbul Black Sea Surveillance Zone
Apr 7, 2026 18:01 UTC 75.0% ▼
  • Duration: 6h 32m
  • Radius: 2 meters
  • Data Points: 65 AIS positions
  • Centroid: 34.7081, 33.3200
  • Zone: Istanbul Black Sea Surveillance Zone
Show Raw Evidence JSON
{
    "radius_m": 2.100000000000000088817841970012523233890533447265625,
    "duration_minutes": 392.8999999999999772626324556767940521240234375,
    "points": 65,
    "centroid": {
        "lat": 34.70814794461538355108132236637175083160400390625,
        "lon": 33.31996695538456521035186597146093845367431640625
    },
    "bbox": {
        "min_lat": 34.7081333000000000765794538892805576324462890625,
        "min_lon": 33.31996670000000193567757378332316875457763671875,
        "max_lat": 34.70816669999999959372871671803295612335205078125,
        "max_lon": 33.31998329999999697292878408916294574737548828125
    },
    "zone_id": "discovered_029"
}
Methodology: 2026.01.18
Zone Dwell Istanbul Black Sea Surveillance Zone
Apr 7, 2026 17:01 UTC 80.0% ▼
  • Zone: Istanbul Black Sea Surveillance Zone
  • Duration: 6h 30m
  • Data Points: 80 AIS positions
  • Period: 2026-04-07T17:01:21+00:00 to 2026-04-07T23:31:22+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_029",
    "zone_name": "Eastern Mediterranean Sanctions Monitoring Zone",
    "dwell_minutes": 390,
    "points_in_zone": 80,
    "first_point": {
        "ts": "2026-04-07T17:01:21+00:00",
        "lat": 34.7081500000000033878677641041576862335205078125,
        "lon": 33.31996670000000193567757378332316875457763671875
    },
    "last_point": {
        "ts": "2026-04-07T23:31:22+00:00",
        "lat": 34.7081500000000033878677641041576862335205078125,
        "lon": 33.31996670000000193567757378332316875457763671875
    }
}
Methodology: 2026.01.18
Loiter Istanbul Black Sea Surveillance Zone
Apr 7, 2026 17:01 UTC 75.0% ▼
  • Duration: 6h 30m
  • Radius: 2 meters
  • Data Points: 80 AIS positions
  • Centroid: 34.7081, 33.3200
  • Zone: Istanbul Black Sea Surveillance Zone
Show Raw Evidence JSON
{
    "radius_m": 2.100000000000000088817841970012523233890533447265625,
    "duration_minutes": 390,
    "points": 80,
    "centroid": {
        "lat": 34.70814770374999369551005656830966472625732421875,
        "lon": 33.3199664899999419276355183683335781097412109375
    },
    "bbox": {
        "min_lat": 34.7081333000000000765794538892805576324462890625,
        "min_lon": 33.31994999999999862438926356844604015350341796875,
        "max_lat": 34.70816669999999959372871671803295612335205078125,
        "max_lon": 33.31998329999999697292878408916294574737548828125
    },
    "zone_id": "discovered_029"
}
Methodology: 2026.01.18
Zone Dwell Istanbul Black Sea Surveillance Zone
Apr 7, 2026 16:01 UTC 80.0% ▼
  • Zone: Istanbul Black Sea Surveillance Zone
  • Duration: 6h 32m
  • Data Points: 81 AIS positions
  • Period: 2026-04-07T16:55:23+00:00 to 2026-04-07T23:28:20+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_029",
    "zone_name": "Eastern Mediterranean Sanctions Monitoring Zone",
    "dwell_minutes": 392.8999999999999772626324556767940521240234375,
    "points_in_zone": 81,
    "first_point": {
        "ts": "2026-04-07T16:55:23+00:00",
        "lat": 34.7081500000000033878677641041576862335205078125,
        "lon": 33.31996670000000193567757378332316875457763671875
    },
    "last_point": {
        "ts": "2026-04-07T23:28:20+00:00",
        "lat": 34.7081500000000033878677641041576862335205078125,
        "lon": 33.31996670000000193567757378332316875457763671875
    }
}
Methodology: 2026.01.18
Loiter Istanbul Black Sea Surveillance Zone
Apr 7, 2026 16:01 UTC 75.0% ▼
  • Duration: 6h 32m
  • Radius: 2 meters
  • Data Points: 81 AIS positions
  • Centroid: 34.7081, 33.3200
  • Zone: Istanbul Black Sea Surveillance Zone
Show Raw Evidence JSON
{
    "radius_m": 2.100000000000000088817841970012523233890533447265625,
    "duration_minutes": 392.8999999999999772626324556767940521240234375,
    "points": 81,
    "centroid": {
        "lat": 34.70814773209875880866093211807310581207275390625,
        "lon": 33.31996649259252762931282632052898406982421875
    },
    "bbox": {
        "min_lat": 34.7081333000000000765794538892805576324462890625,
        "min_lon": 33.31994999999999862438926356844604015350341796875,
        "max_lat": 34.70816669999999959372871671803295612335205078125,
        "max_lon": 33.31998329999999697292878408916294574737548828125
    },
    "zone_id": "discovered_029"
}
Methodology: 2026.01.18
Zone Dwell Istanbul Black Sea Surveillance Zone
Apr 7, 2026 15:01 UTC 80.0% ▼
  • Zone: Istanbul Black Sea Surveillance Zone
  • Duration: 6h 26m
  • Data Points: 88 AIS positions
  • Period: 2026-04-07T15:34:22+00:00 to 2026-04-07T22:01:19+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_029",
    "zone_name": "Eastern Mediterranean Sanctions Monitoring Zone",
    "dwell_minutes": 386.8999999999999772626324556767940521240234375,
    "points_in_zone": 88,
    "first_point": {
        "ts": "2026-04-07T15:34:22+00:00",
        "lat": 34.7081500000000033878677641041576862335205078125,
        "lon": 33.319933300000002418528310954570770263671875
    },
    "last_point": {
        "ts": "2026-04-07T22:01:19+00:00",
        "lat": 34.7081333000000000765794538892805576324462890625,
        "lon": 33.31996670000000193567757378332316875457763671875
    }
}
Methodology: 2026.01.18
Loiter Istanbul Black Sea Surveillance Zone
Apr 7, 2026 15:01 UTC 75.0% ▼
  • Duration: 6h 26m
  • Radius: 3 meters
  • Data Points: 88 AIS positions
  • Centroid: 34.7081, 33.3200
  • Zone: Istanbul Black Sea Surveillance Zone
Show Raw Evidence JSON
{
    "radius_m": 2.79999999999999982236431605997495353221893310546875,
    "duration_minutes": 386.8999999999999772626324556767940521240234375,
    "points": 88,
    "centroid": {
        "lat": 34.7081473431818068320353631861507892608642578125,
        "lon": 33.31996404204539174997989903204143047332763671875
    },
    "bbox": {
        "min_lat": 34.7081333000000000765794538892805576324462890625,
        "min_lon": 33.319933300000002418528310954570770263671875,
        "max_lat": 34.70816669999999959372871671803295612335205078125,
        "max_lon": 33.31998329999999697292878408916294574737548828125
    },
    "zone_id": "discovered_029"
}
Methodology: 2026.01.18
Zone Dwell Istanbul Black Sea Surveillance Zone
Apr 7, 2026 14:13 UTC 80.0% ▼
  • Zone: Istanbul Black Sea Surveillance Zone
  • Duration: 6h 36m
  • Data Points: 90 AIS positions
  • Period: 2026-04-07T14:52:19+00:00 to 2026-04-07T21:28:25+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_029",
    "zone_name": "Eastern Mediterranean Sanctions Monitoring Zone",
    "dwell_minutes": 396.1000000000000227373675443232059478759765625,
    "points_in_zone": 90,
    "first_point": {
        "ts": "2026-04-07T14:52:19+00:00",
        "lat": 34.7081333000000000765794538892805576324462890625,
        "lon": 33.31996670000000193567757378332316875457763671875
    },
    "last_point": {
        "ts": "2026-04-07T21:28:25+00:00",
        "lat": 34.7081333000000000765794538892805576324462890625,
        "lon": 33.31996670000000193567757378332316875457763671875
    }
}
Methodology: 2026.01.18
Loiter Istanbul Black Sea Surveillance Zone
Apr 7, 2026 14:13 UTC 75.0% ▼
  • Duration: 6h 36m
  • Radius: 3 meters
  • Data Points: 90 AIS positions
  • Centroid: 34.7081, 33.3200
  • Zone: Istanbul Black Sea Surveillance Zone
Show Raw Evidence JSON
{
    "radius_m": 2.70000000000000017763568394002504646778106689453125,
    "duration_minutes": 396.1000000000000227373675443232059478759765625,
    "points": 90,
    "centroid": {
        "lat": 34.70814851555552849049490760080516338348388671875,
        "lon": 33.31996261666660075206891633570194244384765625
    },
    "bbox": {
        "min_lat": 34.7081333000000000765794538892805576324462890625,
        "min_lon": 33.319933300000002418528310954570770263671875,
        "max_lat": 34.70816669999999959372871671803295612335205078125,
        "max_lon": 33.31998329999999697292878408916294574737548828125
    },
    "zone_id": "discovered_029"
}
Methodology: 2026.01.18
Zone Dwell Istanbul Black Sea Surveillance Zone
Apr 7, 2026 13:01 UTC 80.0% ▼
  • Zone: Istanbul Black Sea Surveillance Zone
  • Duration: 6h 36m
  • Data Points: 78 AIS positions
  • Period: 2026-04-07T13:01:21+00:00 to 2026-04-07T19:37:22+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_029",
    "zone_name": "Eastern Mediterranean Sanctions Monitoring Zone",
    "dwell_minutes": 396,
    "points_in_zone": 78,
    "first_point": {
        "ts": "2026-04-07T13:01:21+00:00",
        "lat": 34.7081333000000000765794538892805576324462890625,
        "lon": 33.31996670000000193567757378332316875457763671875
    },
    "last_point": {
        "ts": "2026-04-07T19:37:22+00:00",
        "lat": 34.7081500000000033878677641041576862335205078125,
        "lon": 33.31996670000000193567757378332316875457763671875
    }
}
Methodology: 2026.01.18
Loiter Istanbul Black Sea Surveillance Zone
Apr 7, 2026 13:01 UTC 75.0% ▼
  • Duration: 6h 36m
  • Radius: 3 meters
  • Data Points: 78 AIS positions
  • Centroid: 34.7081, 33.3200
  • Zone: Istanbul Black Sea Surveillance Zone
Show Raw Evidence JSON
{
    "radius_m": 2.70000000000000017763568394002504646778106689453125,
    "duration_minutes": 396,
    "points": 78,
    "centroid": {
        "lat": 34.70814764487176518059641239233314990997314453125,
        "lon": 33.319962199999935137384454719722270965576171875
    },
    "bbox": {
        "min_lat": 34.7081333000000000765794538892805576324462890625,
        "min_lon": 33.319933300000002418528310954570770263671875,
        "max_lat": 34.70816669999999959372871671803295612335205078125,
        "max_lon": 33.31998329999999697292878408916294574737548828125
    },
    "zone_id": "discovered_029"
}
Methodology: 2026.01.18
Zone Dwell Istanbul Black Sea Surveillance Zone
Apr 7, 2026 12:49 UTC 80.0% ▼
  • Zone: Istanbul Black Sea Surveillance Zone
  • Duration: 6h 33m
  • Data Points: 77 AIS positions
  • Period: 2026-04-07T12:52:22+00:00 to 2026-04-07T19:25:23+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_029",
    "zone_name": "Eastern Mediterranean Sanctions Monitoring Zone",
    "dwell_minutes": 393,
    "points_in_zone": 77,
    "first_point": {
        "ts": "2026-04-07T12:52:22+00:00",
        "lat": 34.7081333000000000765794538892805576324462890625,
        "lon": 33.31996670000000193567757378332316875457763671875
    },
    "last_point": {
        "ts": "2026-04-07T19:25:23+00:00",
        "lat": 34.7081500000000033878677641041576862335205078125,
        "lon": 33.31996670000000193567757378332316875457763671875
    }
}
Methodology: 2026.01.18
Loiter Istanbul Black Sea Surveillance Zone
Apr 7, 2026 12:49 UTC 75.0% ▼
  • Duration: 6h 33m
  • Radius: 3 meters
  • Data Points: 77 AIS positions
  • Centroid: 34.7081, 33.3200
  • Zone: Istanbul Black Sea Surveillance Zone
Show Raw Evidence JSON
{
    "radius_m": 2.70000000000000017763568394002504646778106689453125,
    "duration_minutes": 393,
    "points": 77,
    "centroid": {
        "lat": 34.70814718051945391152912634424865245819091796875,
        "lon": 33.31996214155838487158689531497657299041748046875
    },
    "bbox": {
        "min_lat": 34.7081333000000000765794538892805576324462890625,
        "min_lon": 33.319933300000002418528310954570770263671875,
        "max_lat": 34.70816669999999959372871671803295612335205078125,
        "max_lon": 33.31998329999999697292878408916294574737548828125
    },
    "zone_id": "discovered_029"
}
Methodology: 2026.01.18
Sts🛰️✗ Istanbul Black Sea Surveillance Zone
Apr 7, 2026 11:23 UTC 77/100 ▼
Vessel A: IMO 9430739 (SRIWANGI III) Singapore
Vessel B: IMO 9693824 (WECO MADELEINE) LIBERIA
  • Minimum Distance: 325 meters
  • Average Distance: 340 meters
  • Duration: 3h 24m
  • Period: 2026-04-07T11:23:12+00:00 to 2026-04-07T14:47:11+00:00
  • Vessel A Avg Speed: 0.2 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Istanbul Black Sea Surveillance Zone

Confidence Analysis

Score: 77/100

Moderate-confidence STS candidate. Two tankers (SRIWANGI III and WECO MADELEINE) maintained close proximity (min 325m, avg 340m) for 204 minutes. Both vessels were slow-moving (avg speeds 0.2 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Eastern Mediterranean Sanctions Monitoring Zone, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness10/25Min distance 325m, avg 340m
Duration25/25Duration 204 minutes
Speed Stability17/20both nearly stationary; stable speeds
Distance Consistency15/15Distance variance ±18m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Eastern Mediterranean Sanctions Monitoring Zone

🛰️ Satellite Corroboration

✗ SAR Not Available

No satellite imagery for this time/location

No Sentinel-1 scenes covering AOI and time window

Searched: 2026-04-07T16:45:04.543682+00:00

Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 563223700,
        "imo": 9430739,
        "name": "SRIWANGI III",
        "flag": "Singapore"
    },
    "vessel_b": {
        "mmsi": 636093045,
        "imo": 9693824,
        "name": "WECO MADELEINE",
        "flag": "LIBERIA"
    },
    "min_distance_m": 325.19999999999998863131622783839702606201171875,
    "avg_distance_m": 339.6000000000000227373675443232059478759765625,
    "distance_consistency_m": 18.199999999999999289457264239899814128875732421875,
    "duration_minutes": 204,
    "overlap_duration_s": 12239,
    "speed_a_avg": 0.2300000000000000099920072216264088638126850128173828125,
    "speed_a_std": 0.39000000000000001332267629550187848508358001708984375,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.2300000000000000099920072216264088638126850128173828125,
            "max_sog": 0.8000000000000000444089209850062616169452667236328125
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-04-07T11:23:12+00:00",
        "end": "2026-04-07T14:47:11+00:00"
    },
    "points_count": {
        "vessel_a": 4,
        "vessel_b": 4
    },
    "zone_id": "discovered_029",
    "zone_name": "Eastern Mediterranean Sanctions Monitoring Zone",
    "score": {
        "value": 77,
        "components": {
            "distance_tightness": {
                "score": 10,
                "max": 25,
                "detail": "Min distance 325m, avg 340m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 204 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: Eastern Mediterranean Sanctions Monitoring Zone"
            }
        },
        "summary": "Moderate-confidence STS candidate. Two tankers (SRIWANGI III and WECO MADELEINE) maintained close proximity (min 325m, avg 340m) for 204 minutes. Both vessels were slow-moving (avg speeds 0.2 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Eastern Mediterranean Sanctions Monitoring Zone, a known STS activity area."
    },
    "sar": {
        "status": "not_found",
        "centroid": {
            "lat": 34.7089179000000029873262974433600902557373046875,
            "lon": 33.32156789999999801921148900873959064483642578125
        },
        "time_window": {
            "start_ts": "2026-04-07T11:23:12+00:00",
            "end_ts": "2026-04-07T14:47:11+00:00"
        },
        "searched_at": "2026-04-07T16:45:04.543682+00:00",
        "notes": "No Sentinel-1 scenes covering AOI and time window"
    }
}
Methodology: 2026.01.18
Zone Dwell Istanbul Black Sea Surveillance Zone
Apr 7, 2026 11:22 UTC 80.0% ▼
  • Zone: Istanbul Black Sea Surveillance Zone
  • Duration: 6h 36m
  • Data Points: 67 AIS positions
  • Period: 2026-04-07T11:40:19+00:00 to 2026-04-07T18:16:22+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_029",
    "zone_name": "Eastern Mediterranean Sanctions Monitoring Zone",
    "dwell_minutes": 396.1000000000000227373675443232059478759765625,
    "points_in_zone": 67,
    "first_point": {
        "ts": "2026-04-07T11:40:19+00:00",
        "lat": 34.70816669999999959372871671803295612335205078125,
        "lon": 33.31994999999999862438926356844604015350341796875
    },
    "last_point": {
        "ts": "2026-04-07T18:16:22+00:00",
        "lat": 34.7081500000000033878677641041576862335205078125,
        "lon": 33.31996670000000193567757378332316875457763671875
    }
}
Methodology: 2026.01.18
Loiter Istanbul Black Sea Surveillance Zone
Apr 7, 2026 11:22 UTC 75.0% ▼
  • Duration: 6h 36m
  • Radius: 3 meters
  • Data Points: 67 AIS positions
  • Centroid: 34.7081, 33.3200
  • Zone: Istanbul Black Sea Surveillance Zone
Show Raw Evidence JSON
{
    "radius_m": 2.600000000000000088817841970012523233890533447265625,
    "duration_minutes": 396.1000000000000227373675443232059478759765625,
    "points": 67,
    "centroid": {
        "lat": 34.70814800597012350635850452817976474761962890625,
        "lon": 33.31996121194024595979499281384050846099853515625
    },
    "bbox": {
        "min_lat": 34.7081333000000000765794538892805576324462890625,
        "min_lon": 33.319933300000002418528310954570770263671875,
        "max_lat": 34.70816669999999959372871671803295612335205078125,
        "max_lon": 33.31998329999999697292878408916294574737548828125
    },
    "zone_id": "discovered_029"
}
Methodology: 2026.01.18
Sts🛰️✗ Istanbul Black Sea Surveillance Zone
Apr 7, 2026 10:06 UTC 69/100 ▼
Vessel A: IMO 9517288 (ALFA SEA) Panama
Vessel B: IMO 9693824 (WECO MADELEINE) LIBERIA
  • Minimum Distance: 340 meters
  • Average Distance: 350 meters
  • Duration: 1h 36m
  • Period: 2026-04-07T10:06:53+00:00 to 2026-04-07T11:43:39+00:00
  • Vessel A Avg Speed: 0.2 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Istanbul Black Sea Surveillance Zone

Confidence Analysis

Score: 69/100

Moderate-confidence STS candidate. Two tankers (ALFA SEA and WECO MADELEINE) maintained close proximity (min 340m, avg 350m) for 97 minutes. Both vessels were slow-moving (avg speeds 0.2 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Eastern Mediterranean Sanctions Monitoring Zone, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness10/25Min distance 340m, avg 350m
Duration20/25Duration 97 minutes
Speed Stability14/20both nearly stationary; somewhat variable speeds
Distance Consistency15/15Distance variance ±8m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Eastern Mediterranean Sanctions Monitoring Zone

🛰️ Satellite Corroboration

✗ SAR Not Available

No satellite imagery for this time/location

No Sentinel-1 scenes covering AOI and time window

Searched: 2026-04-07T16:45:19.378276+00:00

Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 353657000,
        "imo": 9517288,
        "name": "ALFA SEA",
        "flag": "Panama"
    },
    "vessel_b": {
        "mmsi": 636093045,
        "imo": 9693824,
        "name": "WECO MADELEINE",
        "flag": "LIBERIA"
    },
    "min_distance_m": 339.6000000000000227373675443232059478759765625,
    "avg_distance_m": 349.8999999999999772626324556767940521240234375,
    "distance_consistency_m": 7.9000000000000003552713678800500929355621337890625,
    "duration_minutes": 96.7999999999999971578290569595992565155029296875,
    "overlap_duration_s": 5806,
    "speed_a_avg": 0.2399999999999999911182158029987476766109466552734375,
    "speed_a_std": 0.64000000000000001332267629550187848508358001708984375,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.2399999999999999911182158029987476766109466552734375,
            "max_sog": 1.6999999999999999555910790149937383830547332763671875
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-04-07T10:06:53+00:00",
        "end": "2026-04-07T11:43:39+00:00"
    },
    "points_count": {
        "vessel_a": 7,
        "vessel_b": 7
    },
    "zone_id": "discovered_029",
    "zone_name": "Eastern Mediterranean Sanctions Monitoring Zone",
    "score": {
        "value": 69,
        "components": {
            "distance_tightness": {
                "score": 10,
                "max": 25,
                "detail": "Min distance 340m, avg 350m"
            },
            "duration": {
                "score": 20,
                "max": 25,
                "detail": "Duration 97 minutes"
            },
            "speed_stability": {
                "score": 14,
                "max": 20,
                "detail": "both nearly stationary; somewhat variable 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: Eastern Mediterranean Sanctions Monitoring Zone"
            }
        },
        "summary": "Moderate-confidence STS candidate. Two tankers (ALFA SEA and WECO MADELEINE) maintained close proximity (min 340m, avg 350m) for 97 minutes. Both vessels were slow-moving (avg speeds 0.2 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Eastern Mediterranean Sanctions Monitoring Zone, a known STS activity area."
    },
    "sar": {
        "status": "not_found",
        "centroid": {
            "lat": 34.70922209999999807905624038539826869964599609375,
            "lon": 33.3213731000000024096152628771960735321044921875
        },
        "time_window": {
            "start_ts": "2026-04-07T10:06:53+00:00",
            "end_ts": "2026-04-07T11:43:39+00:00"
        },
        "searched_at": "2026-04-07T16:45:19.378276+00:00",
        "notes": "No Sentinel-1 scenes covering AOI and time window"
    }
}
Methodology: 2026.01.18
Zone Dwell Istanbul Black Sea Surveillance Zone
Apr 7, 2026 10:01 UTC 80.0% ▼
  • Zone: Istanbul Black Sea Surveillance Zone
  • Duration: 6h 33m
  • Data Points: 49 AIS positions
  • Period: 2026-04-07T10:13:21+00:00 to 2026-04-07T16:46:21+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_029",
    "zone_name": "Eastern Mediterranean Sanctions Monitoring Zone",
    "dwell_minutes": 393,
    "points_in_zone": 49,
    "first_point": {
        "ts": "2026-04-07T10:13:21+00:00",
        "lat": 34.7081500000000033878677641041576862335205078125,
        "lon": 33.31994999999999862438926356844604015350341796875
    },
    "last_point": {
        "ts": "2026-04-07T16:46:21+00:00",
        "lat": 34.7081500000000033878677641041576862335205078125,
        "lon": 33.31996670000000193567757378332316875457763671875
    }
}
Methodology: 2026.01.18
Loiter Istanbul Black Sea Surveillance Zone
Apr 7, 2026 10:01 UTC 75.0% ▼
  • Duration: 6h 33m
  • Radius: 3 meters
  • Data Points: 49 AIS positions
  • Centroid: 34.7081, 33.3200
  • Zone: Istanbul Black Sea Surveillance Zone
Show Raw Evidence JSON
{
    "radius_m": 2.79999999999999982236431605997495353221893310546875,
    "duration_minutes": 393,
    "points": 49,
    "centroid": {
        "lat": 34.70814829591835604105654056183993816375732421875,
        "lon": 33.31995919591835075834751478396356105804443359375
    },
    "bbox": {
        "min_lat": 34.7081333000000000765794538892805576324462890625,
        "min_lon": 33.319933300000002418528310954570770263671875,
        "max_lat": 34.70816669999999959372871671803295612335205078125,
        "max_lon": 33.31998329999999697292878408916294574737548828125
    },
    "zone_id": "discovered_029"
}
Methodology: 2026.01.18
Sts Istanbul Black Sea Surveillance Zone
Apr 7, 2026 09:52 UTC 77/100 ▼
Vessel A: IMO 9430739 (SRIWANGI III) Singapore
Vessel B: IMO 9693824 (WECO MADELEINE) LIBERIA
  • Minimum Distance: 325 meters
  • Average Distance: 340 meters
  • Duration: 4h 54m
  • Period: 2026-04-07T09:52:14+00:00 to 2026-04-07T14:47:11+00:00
  • Vessel A Avg Speed: 0.2 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Istanbul Black Sea Surveillance Zone

Confidence Analysis

Score: 77/100

Moderate-confidence STS candidate. Two tankers (SRIWANGI III and WECO MADELEINE) maintained close proximity (min 325m, avg 340m) for 295 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 Eastern Mediterranean Sanctions Monitoring Zone, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness10/25Min distance 325m, avg 340m
Duration25/25Duration 295 minutes
Speed Stability17/20both nearly stationary; stable speeds
Distance Consistency15/15Distance variance ±14m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Eastern Mediterranean Sanctions Monitoring Zone
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 563223700,
        "imo": 9430739,
        "name": "SRIWANGI III",
        "flag": "Singapore"
    },
    "vessel_b": {
        "mmsi": 636093045,
        "imo": 9693824,
        "name": "WECO MADELEINE",
        "flag": "LIBERIA"
    },
    "min_distance_m": 325.19999999999998863131622783839702606201171875,
    "avg_distance_m": 340,
    "distance_consistency_m": 14.300000000000000710542735760100185871124267578125,
    "duration_minutes": 294.8999999999999772626324556767940521240234375,
    "overlap_duration_s": 17697,
    "speed_a_avg": 0.1499999999999999944488848768742172978818416595458984375,
    "speed_a_std": 0.320000000000000006661338147750939242541790008544921875,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.1499999999999999944488848768742172978818416595458984375,
            "max_sog": 0.8000000000000000444089209850062616169452667236328125
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-04-07T09:52:14+00:00",
        "end": "2026-04-07T14:47:11+00:00"
    },
    "points_count": {
        "vessel_a": 6,
        "vessel_b": 6
    },
    "zone_id": "discovered_029",
    "zone_name": "Eastern Mediterranean Sanctions Monitoring Zone",
    "score": {
        "value": 77,
        "components": {
            "distance_tightness": {
                "score": 10,
                "max": 25,
                "detail": "Min distance 325m, avg 340m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 295 minutes"
            },
            "speed_stability": {
                "score": 17,
                "max": 20,
                "detail": "both nearly stationary; stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b114m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Eastern Mediterranean Sanctions Monitoring Zone"
            }
        },
        "summary": "Moderate-confidence STS candidate. Two tankers (SRIWANGI III and WECO MADELEINE) maintained close proximity (min 325m, avg 340m) for 295 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 Eastern Mediterranean Sanctions Monitoring Zone, a known STS activity area."
    }
}
Methodology: 2026.01.18
Sts Istanbul Black Sea Surveillance Zone
Apr 7, 2026 09:34 UTC 74/100 ▼
Vessel A: IMO 9517288 (ALFA SEA) Panama
Vessel B: IMO 9693824 (WECO MADELEINE) LIBERIA
  • Minimum Distance: 340 meters
  • Average Distance: 353 meters
  • Duration: 2h 1m
  • Period: 2026-04-07T09:41:57+00:00 to 2026-04-07T11:43:39+00:00
  • Vessel A Avg Speed: 0.2 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Istanbul Black Sea Surveillance Zone

Confidence Analysis

Score: 74/100

Moderate-confidence STS candidate. Two tankers (ALFA SEA and WECO MADELEINE) maintained close proximity (min 340m, avg 352m) for 122 minutes. Both vessels were slow-moving (avg speeds 0.2 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Eastern Mediterranean Sanctions Monitoring Zone, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness10/25Min distance 340m, avg 352m
Duration25/25Duration 122 minutes
Speed Stability14/20both nearly stationary; somewhat variable speeds
Distance Consistency15/15Distance variance ±13m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Eastern Mediterranean Sanctions Monitoring Zone
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 353657000,
        "imo": 9517288,
        "name": "ALFA SEA",
        "flag": "Panama"
    },
    "vessel_b": {
        "mmsi": 636093045,
        "imo": 9693824,
        "name": "WECO MADELEINE",
        "flag": "LIBERIA"
    },
    "min_distance_m": 339.6000000000000227373675443232059478759765625,
    "avg_distance_m": 352.5,
    "distance_consistency_m": 13.4000000000000003552713678800500929355621337890625,
    "duration_minutes": 121.7000000000000028421709430404007434844970703125,
    "overlap_duration_s": 7302,
    "speed_a_avg": 0.1700000000000000122124532708767219446599483489990234375,
    "speed_a_std": 0.54000000000000003552713678800500929355621337890625,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.1700000000000000122124532708767219446599483489990234375,
            "max_sog": 1.6999999999999999555910790149937383830547332763671875
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-04-07T09:41:57+00:00",
        "end": "2026-04-07T11:43:39+00:00"
    },
    "points_count": {
        "vessel_a": 10,
        "vessel_b": 10
    },
    "zone_id": "discovered_029",
    "zone_name": "Eastern Mediterranean Sanctions Monitoring Zone",
    "score": {
        "value": 74,
        "components": {
            "distance_tightness": {
                "score": 10,
                "max": 25,
                "detail": "Min distance 340m, avg 352m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 122 minutes"
            },
            "speed_stability": {
                "score": 14,
                "max": 20,
                "detail": "both nearly stationary; somewhat variable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b113m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Eastern Mediterranean Sanctions Monitoring Zone"
            }
        },
        "summary": "Moderate-confidence STS candidate. Two tankers (ALFA SEA and WECO MADELEINE) maintained close proximity (min 340m, avg 352m) for 122 minutes. Both vessels were slow-moving (avg speeds 0.2 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Eastern Mediterranean Sanctions Monitoring Zone, a known STS activity area."
    }
}
Methodology: 2026.01.18
Zone Dwell Istanbul Black Sea Surveillance Zone
Apr 7, 2026 09:31 UTC 80.0% ▼
  • Zone: Istanbul Black Sea Surveillance Zone
  • Duration: 6h 36m
  • Data Points: 50 AIS positions
  • Period: 2026-04-07T09:52:19+00:00 to 2026-04-07T16:28:23+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_029",
    "zone_name": "Eastern Mediterranean Sanctions Monitoring Zone",
    "dwell_minutes": 396.1000000000000227373675443232059478759765625,
    "points_in_zone": 50,
    "first_point": {
        "ts": "2026-04-07T09:52:19+00:00",
        "lat": 34.70816669999999959372871671803295612335205078125,
        "lon": 33.31994999999999862438926356844604015350341796875
    },
    "last_point": {
        "ts": "2026-04-07T16:28:23+00:00",
        "lat": 34.7081500000000033878677641041576862335205078125,
        "lon": 33.31996670000000193567757378332316875457763671875
    }
}
Methodology: 2026.01.18
Loiter Istanbul Black Sea Surveillance Zone
Apr 7, 2026 09:31 UTC 75.0% ▼
  • Duration: 6h 36m
  • Radius: 6 meters
  • Data Points: 50 AIS positions
  • Centroid: 34.7082, 33.3200
  • Zone: Istanbul Black Sea Surveillance Zone
Show Raw Evidence JSON
{
    "radius_m": 5.9000000000000003552713678800500929355621337890625,
    "duration_minutes": 396.1000000000000227373675443232059478759765625,
    "points": 50,
    "centroid": {
        "lat": 34.7081506659999803332539158873260021209716796875,
        "lon": 33.31995700800001003472061711363494396209716796875
    },
    "bbox": {
        "min_lat": 34.7081333000000000765794538892805576324462890625,
        "min_lon": 33.319933300000002418528310954570770263671875,
        "max_lat": 34.70819999999999794226823723874986171722412109375,
        "max_lon": 33.31998329999999697292878408916294574737548828125
    },
    "zone_id": "discovered_029"
}
Methodology: 2026.01.18
Zone Dwell Istanbul Black Sea Surveillance Zone
Apr 7, 2026 08:04 UTC 80.0% ▼
  • Zone: Istanbul Black Sea Surveillance Zone
  • Duration: 6h 33m
  • Data Points: 35 AIS positions
  • Period: 2026-04-07T08:25:20+00:00 to 2026-04-07T14:58:19+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_029",
    "zone_name": "Eastern Mediterranean Sanctions Monitoring Zone",
    "dwell_minutes": 393,
    "points_in_zone": 35,
    "first_point": {
        "ts": "2026-04-07T08:25:20+00:00",
        "lat": 34.7081500000000033878677641041576862335205078125,
        "lon": 33.31994999999999862438926356844604015350341796875
    },
    "last_point": {
        "ts": "2026-04-07T14:58:19+00:00",
        "lat": 34.7081333000000000765794538892805576324462890625,
        "lon": 33.31996670000000193567757378332316875457763671875
    }
}
Methodology: 2026.01.18
Loiter Istanbul Black Sea Surveillance Zone
Apr 7, 2026 08:04 UTC 75.0% ▼
  • Duration: 6h 33m
  • Radius: 7 meters
  • Data Points: 35 AIS positions
  • Centroid: 34.7082, 33.3200
  • Zone: Istanbul Black Sea Surveillance Zone
Show Raw Evidence JSON
{
    "radius_m": 7.4000000000000003552713678800500929355621337890625,
    "duration_minutes": 393,
    "points": 35,
    "centroid": {
        "lat": 34.70815333428571847207422251813113689422607421875,
        "lon": 33.3199590571428387875130283646285533905029296875
    },
    "bbox": {
        "min_lat": 34.7081333000000000765794538892805576324462890625,
        "min_lon": 33.319933300000002418528310954570770263671875,
        "max_lat": 34.70821670000000125355654745362699031829833984375,
        "max_lon": 33.31998329999999697292878408916294574737548828125
    },
    "zone_id": "discovered_029"
}
Methodology: 2026.01.18
Zone Dwell Istanbul Black Sea Surveillance Zone
Apr 7, 2026 07:01 UTC 80.0% ▼
  • Zone: Istanbul Black Sea Surveillance Zone
  • Duration: 6h 6m
  • Data Points: 38 AIS positions
  • Period: 2026-04-07T07:01:21+00:00 to 2026-04-07T13:07:21+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_029",
    "zone_name": "Eastern Mediterranean Sanctions Monitoring Zone",
    "dwell_minutes": 366,
    "points_in_zone": 38,
    "first_point": {
        "ts": "2026-04-07T07:01:21+00:00",
        "lat": 34.7081333000000000765794538892805576324462890625,
        "lon": 33.31996670000000193567757378332316875457763671875
    },
    "last_point": {
        "ts": "2026-04-07T13:07:21+00:00",
        "lat": 34.7081333000000000765794538892805576324462890625,
        "lon": 33.31998329999999697292878408916294574737548828125
    }
}
Methodology: 2026.01.18
Loiter Istanbul Black Sea Surveillance Zone
Apr 7, 2026 07:01 UTC 75.0% ▼
  • Duration: 6h 6m
  • Radius: 7 meters
  • Data Points: 38 AIS positions
  • Centroid: 34.7082, 33.3200
  • Zone: Istanbul Black Sea Surveillance Zone
Show Raw Evidence JSON
{
    "radius_m": 7.4000000000000003552713678800500929355621337890625,
    "duration_minutes": 366,
    "points": 38,
    "centroid": {
        "lat": 34.708153510526329910135245881974697113037109375,
        "lon": 33.3199583473683986767355236224830150604248046875
    },
    "bbox": {
        "min_lat": 34.7081333000000000765794538892805576324462890625,
        "min_lon": 33.319933300000002418528310954570770263671875,
        "max_lat": 34.70821670000000125355654745362699031829833984375,
        "max_lon": 33.31998329999999697292878408916294574737548828125
    },
    "zone_id": "discovered_029"
}
Methodology: 2026.01.18
Sts🛰️✗ Istanbul Black Sea Surveillance Zone
Apr 7, 2026 07:00 UTC 77/100 ▼
Vessel A: IMO 9517288 (ALFA SEA) Panama
Vessel B: IMO 9693824 (WECO MADELEINE) LIBERIA
  • Minimum Distance: 340 meters
  • Average Distance: 350 meters
  • Duration: 4h 43m
  • Period: 2026-04-07T07:00:23+00:00 to 2026-04-07T11:43:39+00:00
  • Vessel A Avg Speed: 0.1 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Istanbul Black Sea Surveillance Zone

Confidence Analysis

Score: 77/100

Moderate-confidence STS candidate. Two tankers (ALFA SEA and WECO MADELEINE) maintained close proximity (min 340m, avg 350m) for 283 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 Eastern Mediterranean Sanctions Monitoring Zone, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness10/25Min distance 340m, avg 350m
Duration25/25Duration 283 minutes
Speed Stability17/20both nearly stationary; stable speeds
Distance Consistency15/15Distance variance ±12m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Eastern Mediterranean Sanctions Monitoring Zone

🛰️ Satellite Corroboration

✗ SAR Not Available

No satellite imagery for this time/location

No Sentinel-1 scenes covering AOI and time window

Searched: 2026-04-07T13:45:02.101948+00:00

Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 353657000,
        "imo": 9517288,
        "name": "ALFA SEA",
        "flag": "Panama"
    },
    "vessel_b": {
        "mmsi": 636093045,
        "imo": 9693824,
        "name": "WECO MADELEINE",
        "flag": "LIBERIA"
    },
    "min_distance_m": 339.6000000000000227373675443232059478759765625,
    "avg_distance_m": 350.19999999999998863131622783839702606201171875,
    "distance_consistency_m": 12.5,
    "duration_minutes": 283.30000000000001136868377216160297393798828125,
    "overlap_duration_s": 16996,
    "speed_a_avg": 0.13000000000000000444089209850062616169452667236328125,
    "speed_a_std": 0.4699999999999999733546474089962430298328399658203125,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.13000000000000000444089209850062616169452667236328125,
            "max_sog": 1.6999999999999999555910790149937383830547332763671875
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-04-07T07:00:23+00:00",
        "end": "2026-04-07T11:43:39+00:00"
    },
    "points_count": {
        "vessel_a": 13,
        "vessel_b": 13
    },
    "zone_id": "discovered_029",
    "zone_name": "Eastern Mediterranean Sanctions Monitoring Zone",
    "score": {
        "value": 77,
        "components": {
            "distance_tightness": {
                "score": 10,
                "max": 25,
                "detail": "Min distance 340m, avg 350m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 283 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: Eastern Mediterranean Sanctions Monitoring Zone"
            }
        },
        "summary": "Moderate-confidence STS candidate. Two tankers (ALFA SEA and WECO MADELEINE) maintained close proximity (min 340m, avg 350m) for 283 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 Eastern Mediterranean Sanctions Monitoring Zone, a known STS activity area."
    },
    "sar": {
        "status": "not_found",
        "centroid": {
            "lat": 34.70922399999999896635927143506705760955810546875,
            "lon": 33.321372400000001334774424321949481964111328125
        },
        "time_window": {
            "start_ts": "2026-04-07T07:00:23+00:00",
            "end_ts": "2026-04-07T11:43:39+00:00"
        },
        "searched_at": "2026-04-07T13:45:02.101948+00:00",
        "notes": "No Sentinel-1 scenes covering AOI and time window"
    }
}
Methodology: 2026.01.18
Zone Dwell Istanbul Black Sea Surveillance Zone
Apr 7, 2026 06:01 UTC 80.0% ▼
  • Zone: Istanbul Black Sea Surveillance Zone
  • Duration: 6h 30m
  • Data Points: 44 AIS positions
  • Period: 2026-04-07T06:37:23+00:00 to 2026-04-07T13:07:21+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_029",
    "zone_name": "Eastern Mediterranean Sanctions Monitoring Zone",
    "dwell_minutes": 390,
    "points_in_zone": 44,
    "first_point": {
        "ts": "2026-04-07T06:37:23+00:00",
        "lat": 34.7081333000000000765794538892805576324462890625,
        "lon": 33.31996670000000193567757378332316875457763671875
    },
    "last_point": {
        "ts": "2026-04-07T13:07:21+00:00",
        "lat": 34.7081333000000000765794538892805576324462890625,
        "lon": 33.31998329999999697292878408916294574737548828125
    }
}
Methodology: 2026.01.18
Loiter Istanbul Black Sea Surveillance Zone
Apr 7, 2026 06:01 UTC 75.0% ▼
  • Duration: 6h 30m
  • Radius: 8 meters
  • Data Points: 44 AIS positions
  • Centroid: 34.7082, 33.3200
  • Zone: Istanbul Black Sea Surveillance Zone
Show Raw Evidence JSON
{
    "radius_m": 7.70000000000000017763568394002504646778106689453125,
    "duration_minutes": 390,
    "points": 44,
    "centroid": {
        "lat": 34.70815075454546416722223511897027492523193359375,
        "lon": 33.31995796818178945386534905992448329925537109375
    },
    "bbox": {
        "min_lat": 34.7081333000000000765794538892805576324462890625,
        "min_lon": 33.319933300000002418528310954570770263671875,
        "max_lat": 34.70821670000000125355654745362699031829833984375,
        "max_lon": 33.31998329999999697292878408916294574737548828125
    },
    "zone_id": "discovered_029"
}
Methodology: 2026.01.18
Sts Istanbul Black Sea Surveillance Zone
Apr 7, 2026 06:00 UTC 77/100 ▼
Vessel A: IMO 9517288 (ALFA SEA) Panama
Vessel B: IMO 9693824 (WECO MADELEINE) LIBERIA
  • Minimum Distance: 340 meters
  • Average Distance: 349 meters
  • Duration: 5h 7m
  • Period: 2026-04-07T06:36:21+00:00 to 2026-04-07T11:43:39+00:00
  • Vessel A Avg Speed: 0.1 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Istanbul Black Sea Surveillance Zone

Confidence Analysis

Score: 77/100

Moderate-confidence STS candidate. Two tankers (ALFA SEA and WECO MADELEINE) maintained close proximity (min 340m, avg 349m) for 307 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 Eastern Mediterranean Sanctions Monitoring Zone, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness10/25Min distance 340m, avg 349m
Duration25/25Duration 307 minutes
Speed Stability17/20both nearly stationary; stable speeds
Distance Consistency15/15Distance variance ±11m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Eastern Mediterranean Sanctions Monitoring Zone
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 353657000,
        "imo": 9517288,
        "name": "ALFA SEA",
        "flag": "Panama"
    },
    "vessel_b": {
        "mmsi": 636093045,
        "imo": 9693824,
        "name": "WECO MADELEINE",
        "flag": "LIBERIA"
    },
    "min_distance_m": 339.6000000000000227373675443232059478759765625,
    "avg_distance_m": 349.19999999999998863131622783839702606201171875,
    "distance_consistency_m": 11,
    "duration_minutes": 307.30000000000001136868377216160297393798828125,
    "overlap_duration_s": 18438,
    "speed_a_avg": 0.11000000000000000055511151231257827021181583404541015625,
    "speed_a_std": 0.409999999999999975575093458246556110680103302001953125,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.11000000000000000055511151231257827021181583404541015625,
            "max_sog": 1.6999999999999999555910790149937383830547332763671875
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-04-07T06:36:21+00:00",
        "end": "2026-04-07T11:43:39+00:00"
    },
    "points_count": {
        "vessel_a": 17,
        "vessel_b": 17
    },
    "zone_id": "discovered_029",
    "zone_name": "Eastern Mediterranean Sanctions Monitoring Zone",
    "score": {
        "value": 77,
        "components": {
            "distance_tightness": {
                "score": 10,
                "max": 25,
                "detail": "Min distance 340m, avg 349m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 307 minutes"
            },
            "speed_stability": {
                "score": 17,
                "max": 20,
                "detail": "both nearly stationary; stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b111m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Eastern Mediterranean Sanctions Monitoring Zone"
            }
        },
        "summary": "Moderate-confidence STS candidate. Two tankers (ALFA SEA and WECO MADELEINE) maintained close proximity (min 340m, avg 349m) for 307 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 Eastern Mediterranean Sanctions Monitoring Zone, a known STS activity area."
    }
}
Methodology: 2026.01.18
Sts Istanbul Black Sea Surveillance Zone
Apr 7, 2026 05:58 UTC 80/100 ▼
Vessel A: IMO 9517288 (ALFA SEA) Panama
Vessel B: IMO 9693824 (WECO MADELEINE) LIBERIA
  • Minimum Distance: 338 meters
  • Average Distance: 347 meters
  • Duration: 6h 23m
  • Period: 2026-04-07T05:03:16+00:00 to 2026-04-07T11:26:22+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Istanbul Black Sea Surveillance Zone

Confidence Analysis

Score: 80/100

High-confidence STS candidate. Two tankers (ALFA SEA and WECO MADELEINE) maintained close proximity (min 338m, avg 347m) for 383 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 Eastern Mediterranean Sanctions Monitoring Zone, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness10/25Min distance 338m, avg 347m
Duration25/25Duration 383 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±10m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Eastern Mediterranean Sanctions Monitoring Zone
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 353657000,
        "imo": 9517288,
        "name": "ALFA SEA",
        "flag": "Panama"
    },
    "vessel_b": {
        "mmsi": 636093045,
        "imo": 9693824,
        "name": "WECO MADELEINE",
        "flag": "LIBERIA"
    },
    "min_distance_m": 337.5,
    "avg_distance_m": 346.6000000000000227373675443232059478759765625,
    "distance_consistency_m": 9.699999999999999289457264239899814128875732421875,
    "duration_minutes": 383.1000000000000227373675443232059478759765625,
    "overlap_duration_s": 22986,
    "speed_a_avg": 0.01000000000000000020816681711721685132943093776702880859375,
    "speed_a_std": 0.0299999999999999988897769753748434595763683319091796875,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.01000000000000000020816681711721685132943093776702880859375,
            "max_sog": 0.1000000000000000055511151231257827021181583404541015625
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-04-07T05:03:16+00:00",
        "end": "2026-04-07T11:26:22+00:00"
    },
    "points_count": {
        "vessel_a": 20,
        "vessel_b": 20
    },
    "zone_id": "discovered_029",
    "zone_name": "Eastern Mediterranean Sanctions Monitoring Zone",
    "score": {
        "value": 80,
        "components": {
            "distance_tightness": {
                "score": 10,
                "max": 25,
                "detail": "Min distance 338m, avg 347m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 383 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b110m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Eastern Mediterranean Sanctions Monitoring Zone"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (ALFA SEA and WECO MADELEINE) maintained close proximity (min 338m, avg 347m) for 383 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 Eastern Mediterranean Sanctions Monitoring Zone, a known STS activity area."
    }
}
Methodology: 2026.01.18
Zone Dwell Istanbul Black Sea Surveillance Zone
Apr 7, 2026 05:01 UTC 80.0% ▼
  • Zone: Istanbul Black Sea Surveillance Zone
  • Duration: 6h 27m
  • Data Points: 53 AIS positions
  • Period: 2026-04-07T05:16:20+00:00 to 2026-04-07T11:43:23+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_029",
    "zone_name": "Eastern Mediterranean Sanctions Monitoring Zone",
    "dwell_minutes": 387.1000000000000227373675443232059478759765625,
    "points_in_zone": 53,
    "first_point": {
        "ts": "2026-04-07T05:16:20+00:00",
        "lat": 34.7081333000000000765794538892805576324462890625,
        "lon": 33.31996670000000193567757378332316875457763671875
    },
    "last_point": {
        "ts": "2026-04-07T11:43:23+00:00",
        "lat": 34.70816669999999959372871671803295612335205078125,
        "lon": 33.31996670000000193567757378332316875457763671875
    }
}
Methodology: 2026.01.18
Loiter Istanbul Black Sea Surveillance Zone
Apr 7, 2026 05:01 UTC 75.0% ▼
  • Duration: 6h 27m
  • Radius: 8 meters
  • Data Points: 53 AIS positions
  • Centroid: 34.7082, 33.3200
  • Zone: Istanbul Black Sea Surveillance Zone
Show Raw Evidence JSON
{
    "radius_m": 7.70000000000000017763568394002504646778106689453125,
    "duration_minutes": 387.1000000000000227373675443232059478759765625,
    "points": 53,
    "centroid": {
        "lat": 34.70815031132074324204950244165956974029541015625,
        "lon": 33.31995882264151731533274869434535503387451171875
    },
    "bbox": {
        "min_lat": 34.7081333000000000765794538892805576324462890625,
        "min_lon": 33.319933300000002418528310954570770263671875,
        "max_lat": 34.70821670000000125355654745362699031829833984375,
        "max_lon": 33.31996670000000193567757378332316875457763671875
    },
    "zone_id": "discovered_029"
}
Methodology: 2026.01.18
Sts Istanbul Black Sea Surveillance Zone
Apr 7, 2026 04:19 UTC 80/100 ▼
Vessel A: IMO 9430739 (SRIWANGI III) Singapore
Vessel B: IMO 9693824 (WECO MADELEINE) LIBERIA
  • Minimum Distance: 331 meters
  • Average Distance: 336 meters
  • Duration: 5h 7m
  • Period: 2026-04-07T04:48:14+00:00 to 2026-04-07T09:55:46+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Istanbul Black Sea Surveillance Zone

Confidence Analysis

Score: 80/100

High-confidence STS candidate. Two tankers (SRIWANGI III and WECO MADELEINE) maintained close proximity (min 330m, avg 336m) for 308 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 Eastern Mediterranean Sanctions Monitoring Zone, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness10/25Min distance 330m, avg 336m
Duration25/25Duration 308 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±5m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Eastern Mediterranean Sanctions Monitoring Zone
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 563223700,
        "imo": 9430739,
        "name": "SRIWANGI III",
        "flag": "Singapore"
    },
    "vessel_b": {
        "mmsi": 636093045,
        "imo": 9693824,
        "name": "WECO MADELEINE",
        "flag": "LIBERIA"
    },
    "min_distance_m": 330.5,
    "avg_distance_m": 336.19999999999998863131622783839702606201171875,
    "distance_consistency_m": 4.70000000000000017763568394002504646778106689453125,
    "duration_minutes": 307.5,
    "overlap_duration_s": 18452,
    "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": "2026-04-07T04:48:14+00:00",
        "end": "2026-04-07T09:55:46+00:00"
    },
    "points_count": {
        "vessel_a": 6,
        "vessel_b": 6
    },
    "zone_id": "discovered_029",
    "zone_name": "Eastern Mediterranean Sanctions Monitoring Zone",
    "score": {
        "value": 80,
        "components": {
            "distance_tightness": {
                "score": 10,
                "max": 25,
                "detail": "Min distance 330m, avg 336m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 308 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b15m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Eastern Mediterranean Sanctions Monitoring Zone"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (SRIWANGI III and WECO MADELEINE) maintained close proximity (min 330m, avg 336m) for 308 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 Eastern Mediterranean Sanctions Monitoring Zone, a known STS activity area."
    }
}
Methodology: 2026.01.18
Sts🛰️✗ Istanbul Black Sea Surveillance Zone
Apr 7, 2026 04:06 UTC 80/100 ▼
Vessel A: IMO 9517288 (ALFA SEA) Panama
Vessel B: IMO 9693824 (WECO MADELEINE) LIBERIA
  • Minimum Distance: 338 meters
  • Average Distance: 346 meters
  • Duration: 6h 9m
  • Period: 2026-04-07T04:06:15+00:00 to 2026-04-07T10:15:54+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Istanbul Black Sea Surveillance Zone

Confidence Analysis

Score: 80/100

High-confidence STS candidate. Two tankers (ALFA SEA and WECO MADELEINE) maintained close proximity (min 338m, avg 346m) for 370 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 Eastern Mediterranean Sanctions Monitoring Zone, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness10/25Min distance 338m, avg 346m
Duration25/25Duration 370 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±8m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Eastern Mediterranean Sanctions Monitoring Zone

🛰️ Satellite Corroboration

✗ SAR Not Available

No satellite imagery for this time/location

No Sentinel-1 scenes covering AOI and time window

Searched: 2026-04-07T10:45:01.279496+00:00

Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 353657000,
        "imo": 9517288,
        "name": "ALFA SEA",
        "flag": "Panama"
    },
    "vessel_b": {
        "mmsi": 636093045,
        "imo": 9693824,
        "name": "WECO MADELEINE",
        "flag": "LIBERIA"
    },
    "min_distance_m": 337.5,
    "avg_distance_m": 346.30000000000001136868377216160297393798828125,
    "distance_consistency_m": 8.5,
    "duration_minutes": 369.6000000000000227373675443232059478759765625,
    "overlap_duration_s": 22179,
    "speed_a_avg": 0.01000000000000000020816681711721685132943093776702880859375,
    "speed_a_std": 0.0299999999999999988897769753748434595763683319091796875,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.01000000000000000020816681711721685132943093776702880859375,
            "max_sog": 0.1000000000000000055511151231257827021181583404541015625
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-04-07T04:06:15+00:00",
        "end": "2026-04-07T10:15:54+00:00"
    },
    "points_count": {
        "vessel_a": 26,
        "vessel_b": 26
    },
    "zone_id": "discovered_029",
    "zone_name": "Eastern Mediterranean Sanctions Monitoring Zone",
    "score": {
        "value": 80,
        "components": {
            "distance_tightness": {
                "score": 10,
                "max": 25,
                "detail": "Min distance 338m, avg 346m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 370 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: Eastern Mediterranean Sanctions Monitoring Zone"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (ALFA SEA and WECO MADELEINE) maintained close proximity (min 338m, avg 346m) for 370 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 Eastern Mediterranean Sanctions Monitoring Zone, a known STS activity area."
    },
    "sar": {
        "status": "not_found",
        "centroid": {
            "lat": 34.70919909999999930505509837530553340911865234375,
            "lon": 33.3213568999999978359483066014945507049560546875
        },
        "time_window": {
            "start_ts": "2026-04-07T04:06:15+00:00",
            "end_ts": "2026-04-07T10:15:54+00:00"
        },
        "searched_at": "2026-04-07T10:45:01.279496+00:00",
        "notes": "No Sentinel-1 scenes covering AOI and time window"
    }
}
Methodology: 2026.01.18
Zone Dwell Istanbul Black Sea Surveillance Zone
Apr 7, 2026 04:01 UTC 80.0% ▼
  • Zone: Istanbul Black Sea Surveillance Zone
  • Duration: 6h 33m
  • Data Points: 52 AIS positions
  • Period: 2026-04-07T04:52:21+00:00 to 2026-04-07T11:25:23+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_029",
    "zone_name": "Eastern Mediterranean Sanctions Monitoring Zone",
    "dwell_minutes": 393,
    "points_in_zone": 52,
    "first_point": {
        "ts": "2026-04-07T04:52:21+00:00",
        "lat": 34.7081333000000000765794538892805576324462890625,
        "lon": 33.31996670000000193567757378332316875457763671875
    },
    "last_point": {
        "ts": "2026-04-07T11:25:23+00:00",
        "lat": 34.70816669999999959372871671803295612335205078125,
        "lon": 33.31996670000000193567757378332316875457763671875
    }
}
Methodology: 2026.01.18
Loiter Istanbul Black Sea Surveillance Zone
Apr 7, 2026 04:01 UTC 75.0% ▼
  • Duration: 6h 33m
  • Radius: 8 meters
  • Data Points: 52 AIS positions
  • Centroid: 34.7081, 33.3200
  • Zone: Istanbul Black Sea Surveillance Zone
Show Raw Evidence JSON
{
    "radius_m": 7.9000000000000003552713678800500929355621337890625,
    "duration_minutes": 393,
    "points": 52,
    "centroid": {
        "lat": 34.70814903269229034776799380779266357421875,
        "lon": 33.31995899230769708765365066938102245330810546875
    },
    "bbox": {
        "min_lat": 34.7081333000000000765794538892805576324462890625,
        "min_lon": 33.319933300000002418528310954570770263671875,
        "max_lat": 34.70821670000000125355654745362699031829833984375,
        "max_lon": 33.31996670000000193567757378332316875457763671875
    },
    "zone_id": "discovered_029"
}
Methodology: 2026.01.18
Sts Istanbul Black Sea Surveillance Zone
Apr 7, 2026 03:12 UTC 80/100 ▼
Vessel A: IMO 9430739 (SRIWANGI III) Singapore
Vessel B: IMO 9693824 (WECO MADELEINE) LIBERIA
  • Minimum Distance: 331 meters
  • Average Distance: 335 meters
  • Duration: 6h 13m
  • Period: 2026-04-07T03:42:08+00:00 to 2026-04-07T09:55:46+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Istanbul Black Sea Surveillance Zone

Confidence Analysis

Score: 80/100

High-confidence STS candidate. Two tankers (SRIWANGI III and WECO MADELEINE) maintained close proximity (min 330m, avg 335m) for 374 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 Eastern Mediterranean Sanctions Monitoring Zone, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness10/25Min distance 330m, avg 335m
Duration25/25Duration 374 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±4m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Eastern Mediterranean Sanctions Monitoring Zone
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 563223700,
        "imo": 9430739,
        "name": "SRIWANGI III",
        "flag": "Singapore"
    },
    "vessel_b": {
        "mmsi": 636093045,
        "imo": 9693824,
        "name": "WECO MADELEINE",
        "flag": "LIBERIA"
    },
    "min_distance_m": 330.5,
    "avg_distance_m": 335.30000000000001136868377216160297393798828125,
    "distance_consistency_m": 4,
    "duration_minutes": 373.6000000000000227373675443232059478759765625,
    "overlap_duration_s": 22418,
    "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": "2026-04-07T03:42:08+00:00",
        "end": "2026-04-07T09:55:46+00:00"
    },
    "points_count": {
        "vessel_a": 9,
        "vessel_b": 9
    },
    "zone_id": "discovered_029",
    "zone_name": "Eastern Mediterranean Sanctions Monitoring Zone",
    "score": {
        "value": 80,
        "components": {
            "distance_tightness": {
                "score": 10,
                "max": 25,
                "detail": "Min distance 330m, avg 335m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 374 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b14m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Eastern Mediterranean Sanctions Monitoring Zone"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (SRIWANGI III and WECO MADELEINE) maintained close proximity (min 330m, avg 335m) for 374 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 Eastern Mediterranean Sanctions Monitoring Zone, a known STS activity area."
    }
}
Methodology: 2026.01.18
Sts Istanbul Black Sea Surveillance Zone
Apr 7, 2026 03:01 UTC 80/100 ▼
Vessel A: IMO 9517288 (ALFA SEA) Panama
Vessel B: IMO 9693824 (WECO MADELEINE) LIBERIA
  • Minimum Distance: 338 meters
  • Average Distance: 347 meters
  • Duration: 6h 26m
  • Period: 2026-04-07T03:40:30+00:00 to 2026-04-07T10:06:53+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Istanbul Black Sea Surveillance Zone

Confidence Analysis

Score: 80/100

High-confidence STS candidate. Two tankers (ALFA SEA and WECO MADELEINE) maintained close proximity (min 338m, avg 346m) for 386 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 Eastern Mediterranean Sanctions Monitoring Zone, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness10/25Min distance 338m, avg 346m
Duration25/25Duration 386 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±8m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Eastern Mediterranean Sanctions Monitoring Zone
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 353657000,
        "imo": 9517288,
        "name": "ALFA SEA",
        "flag": "Panama"
    },
    "vessel_b": {
        "mmsi": 636093045,
        "imo": 9693824,
        "name": "WECO MADELEINE",
        "flag": "LIBERIA"
    },
    "min_distance_m": 337.5,
    "avg_distance_m": 346.5,
    "distance_consistency_m": 7.79999999999999982236431605997495353221893310546875,
    "duration_minutes": 386.3999999999999772626324556767940521240234375,
    "overlap_duration_s": 23183,
    "speed_a_avg": 0.01000000000000000020816681711721685132943093776702880859375,
    "speed_a_std": 0.0200000000000000004163336342344337026588618755340576171875,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.01000000000000000020816681711721685132943093776702880859375,
            "max_sog": 0.1000000000000000055511151231257827021181583404541015625
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-04-07T03:40:30+00:00",
        "end": "2026-04-07T10:06:53+00:00"
    },
    "points_count": {
        "vessel_a": 31,
        "vessel_b": 31
    },
    "zone_id": "discovered_029",
    "zone_name": "Eastern Mediterranean Sanctions Monitoring Zone",
    "score": {
        "value": 80,
        "components": {
            "distance_tightness": {
                "score": 10,
                "max": 25,
                "detail": "Min distance 338m, avg 346m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 386 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: Eastern Mediterranean Sanctions Monitoring Zone"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (ALFA SEA and WECO MADELEINE) maintained close proximity (min 338m, avg 346m) for 386 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 Eastern Mediterranean Sanctions Monitoring Zone, a known STS activity area."
    }
}
Methodology: 2026.01.18
Zone Dwell Istanbul Black Sea Surveillance Zone
Apr 7, 2026 03:01 UTC 80.0% ▼
  • Zone: Istanbul Black Sea Surveillance Zone
  • Duration: 6h 35m
  • Data Points: 71 AIS positions
  • Period: 2026-04-07T03:40:21+00:00 to 2026-04-07T10:16:18+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_029",
    "zone_name": "Eastern Mediterranean Sanctions Monitoring Zone",
    "dwell_minutes": 395.8999999999999772626324556767940521240234375,
    "points_in_zone": 71,
    "first_point": {
        "ts": "2026-04-07T03:40:21+00:00",
        "lat": 34.7081500000000033878677641041576862335205078125,
        "lon": 33.31994999999999862438926356844604015350341796875
    },
    "last_point": {
        "ts": "2026-04-07T10:16:18+00:00",
        "lat": 34.7081500000000033878677641041576862335205078125,
        "lon": 33.31994999999999862438926356844604015350341796875
    }
}
Methodology: 2026.01.18
Loiter Istanbul Black Sea Surveillance Zone
Apr 7, 2026 03:01 UTC 75.0% ▼
  • Duration: 6h 35m
  • Radius: 8 meters
  • Data Points: 71 AIS positions
  • Centroid: 34.7081, 33.3200
  • Zone: Istanbul Black Sea Surveillance Zone
Show Raw Evidence JSON
{
    "radius_m": 8,
    "duration_minutes": 395.8999999999999772626324556767940521240234375,
    "points": 71,
    "centroid": {
        "lat": 34.708147880281700281557277776300907135009765625,
        "lon": 33.3199579971830956992562278173863887786865234375
    },
    "bbox": {
        "min_lat": 34.7081333000000000765794538892805576324462890625,
        "min_lon": 33.319933300000002418528310954570770263671875,
        "max_lat": 34.70821670000000125355654745362699031829833984375,
        "max_lon": 33.31996670000000193567757378332316875457763671875
    },
    "zone_id": "discovered_029"
}
Methodology: 2026.01.18
Sts🛰️✗ Istanbul Black Sea Surveillance Zone
Apr 7, 2026 02:08 UTC 85/100 ▼
Vessel A: IMO 9430739 (SRIWANGI III) Singapore
Vessel B: IMO 9693824 (WECO MADELEINE) LIBERIA
  • Minimum Distance: 270 meters
  • Average Distance: 330 meters
  • Duration: 5h 15m
  • Period: 2026-04-07T02:08:30+00:00 to 2026-04-07T07:24:15+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Istanbul Black Sea Surveillance Zone

Confidence Analysis

Score: 85/100

High-confidence STS candidate. Two tankers (SRIWANGI III and WECO MADELEINE) maintained close proximity (min 270m, avg 330m) for 316 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 Eastern Mediterranean Sanctions Monitoring Zone, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness15/25Min distance 270m, avg 330m
Duration25/25Duration 316 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±16m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Eastern Mediterranean Sanctions Monitoring Zone

🛰️ Satellite Corroboration

✗ SAR Not Available

No satellite imagery for this time/location

No Sentinel-1 scenes covering AOI and time window

Searched: 2026-04-07T08:30:04.593943+00:00

Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 563223700,
        "imo": 9430739,
        "name": "SRIWANGI III",
        "flag": "Singapore"
    },
    "vessel_b": {
        "mmsi": 636093045,
        "imo": 9693824,
        "name": "WECO MADELEINE",
        "flag": "LIBERIA"
    },
    "min_distance_m": 270,
    "avg_distance_m": 329.80000000000001136868377216160297393798828125,
    "distance_consistency_m": 16.10000000000000142108547152020037174224853515625,
    "duration_minutes": 315.80000000000001136868377216160297393798828125,
    "overlap_duration_s": 18945,
    "speed_a_avg": 0.0200000000000000004163336342344337026588618755340576171875,
    "speed_a_std": 0.05000000000000000277555756156289135105907917022705078125,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.0200000000000000004163336342344337026588618755340576171875,
            "max_sog": 0.200000000000000011102230246251565404236316680908203125
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-04-07T02:08:30+00:00",
        "end": "2026-04-07T07:24:15+00:00"
    },
    "points_count": {
        "vessel_a": 16,
        "vessel_b": 16
    },
    "zone_id": "discovered_029",
    "zone_name": "Eastern Mediterranean Sanctions Monitoring Zone",
    "score": {
        "value": 85,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 270m, avg 330m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 316 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b116m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Eastern Mediterranean Sanctions Monitoring Zone"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (SRIWANGI III and WECO MADELEINE) maintained close proximity (min 270m, avg 330m) for 316 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 Eastern Mediterranean Sanctions Monitoring Zone, a known STS activity area."
    },
    "sar": {
        "status": "not_found",
        "centroid": {
            "lat": 34.70895159999999890487742959521710872650146484375,
            "lon": 33.3214808000000033416654332540929317474365234375
        },
        "time_window": {
            "start_ts": "2026-04-07T02:08:30+00:00",
            "end_ts": "2026-04-07T07:24:15+00:00"
        },
        "searched_at": "2026-04-07T08:30:04.593943+00:00",
        "notes": "No Sentinel-1 scenes covering AOI and time window"
    }
}
Methodology: 2026.01.18
Sts🛰️✗ Istanbul Black Sea Surveillance Zone
Apr 7, 2026 02:02 UTC 80/100 ▼
Vessel A: IMO 9517288 (ALFA SEA) Panama
Vessel B: IMO 9693824 (WECO MADELEINE) LIBERIA
  • Minimum Distance: 338 meters
  • Average Distance: 346 meters
  • Duration: 5h 13m
  • Period: 2026-04-07T02:02:04+00:00 to 2026-04-07T07:15:24+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Istanbul Black Sea Surveillance Zone

Confidence Analysis

Score: 80/100

High-confidence STS candidate. Two tankers (ALFA SEA and WECO MADELEINE) maintained close proximity (min 338m, avg 346m) for 313 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 Eastern Mediterranean Sanctions Monitoring Zone, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness10/25Min distance 338m, avg 346m
Duration25/25Duration 313 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±5m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Eastern Mediterranean Sanctions Monitoring Zone

🛰️ Satellite Corroboration

✗ SAR Not Available

No satellite imagery for this time/location

No Sentinel-1 scenes covering AOI and time window

Searched: 2026-04-07T08:45:03.732490+00:00

Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 353657000,
        "imo": 9517288,
        "name": "ALFA SEA",
        "flag": "Panama"
    },
    "vessel_b": {
        "mmsi": 636093045,
        "imo": 9693824,
        "name": "WECO MADELEINE",
        "flag": "LIBERIA"
    },
    "min_distance_m": 337.5,
    "avg_distance_m": 346,
    "distance_consistency_m": 5.29999999999999982236431605997495353221893310546875,
    "duration_minutes": 313.30000000000001136868377216160297393798828125,
    "overlap_duration_s": 18800,
    "speed_a_avg": 0.01000000000000000020816681711721685132943093776702880859375,
    "speed_a_std": 0.0299999999999999988897769753748434595763683319091796875,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.01000000000000000020816681711721685132943093776702880859375,
            "max_sog": 0.1000000000000000055511151231257827021181583404541015625
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-04-07T02:02:04+00:00",
        "end": "2026-04-07T07:15:24+00:00"
    },
    "points_count": {
        "vessel_a": 44,
        "vessel_b": 44
    },
    "zone_id": "discovered_029",
    "zone_name": "Eastern Mediterranean Sanctions Monitoring Zone",
    "score": {
        "value": 80,
        "components": {
            "distance_tightness": {
                "score": 10,
                "max": 25,
                "detail": "Min distance 338m, avg 346m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 313 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b15m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Eastern Mediterranean Sanctions Monitoring Zone"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (ALFA SEA and WECO MADELEINE) maintained close proximity (min 338m, avg 346m) for 313 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 Eastern Mediterranean Sanctions Monitoring Zone, a known STS activity area."
    },
    "sar": {
        "status": "not_found",
        "centroid": {
            "lat": 34.70919820000000299842213280498981475830078125,
            "lon": 33.32135720000000134177753352560102939605712890625
        },
        "time_window": {
            "start_ts": "2026-04-07T02:02:04+00:00",
            "end_ts": "2026-04-07T07:15:24+00:00"
        },
        "searched_at": "2026-04-07T08:45:03.732490+00:00",
        "notes": "No Sentinel-1 scenes covering AOI and time window"
    }
}
Methodology: 2026.01.18
Zone Dwell Istanbul Black Sea Surveillance Zone
Apr 7, 2026 02:01 UTC 80.0% ▼
  • Zone: Istanbul Black Sea Surveillance Zone
  • Duration: 6h 27m
  • Data Points: 81 AIS positions
  • Period: 2026-04-07T02:01:22+00:00 to 2026-04-07T08:28:21+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_029",
    "zone_name": "Eastern Mediterranean Sanctions Monitoring Zone",
    "dwell_minutes": 387,
    "points_in_zone": 81,
    "first_point": {
        "ts": "2026-04-07T02:01:22+00:00",
        "lat": 34.70816669999999959372871671803295612335205078125,
        "lon": 33.31996670000000193567757378332316875457763671875
    },
    "last_point": {
        "ts": "2026-04-07T08:28:21+00:00",
        "lat": 34.7081500000000033878677641041576862335205078125,
        "lon": 33.31994999999999862438926356844604015350341796875
    }
}
Methodology: 2026.01.18
Loiter Istanbul Black Sea Surveillance Zone
Apr 7, 2026 02:01 UTC 75.0% ▼
  • Duration: 6h 27m
  • Radius: 7 meters
  • Data Points: 81 AIS positions
  • Centroid: 34.7081, 33.3200
  • Zone: Istanbul Black Sea Surveillance Zone
Show Raw Evidence JSON
{
    "radius_m": 6.70000000000000017763568394002504646778106689453125,
    "duration_minutes": 387,
    "points": 81,
    "centroid": {
        "lat": 34.70814752345679465861394419334828853607177734375,
        "lon": 33.319959892592549977052840404212474822998046875
    },
    "bbox": {
        "min_lat": 34.70811669999999793390088598243892192840576171875,
        "min_lon": 33.31994999999999862438926356844604015350341796875,
        "max_lat": 34.70819999999999794226823723874986171722412109375,
        "max_lon": 33.32003329999999863275661482475697994232177734375
    },
    "zone_id": "discovered_029"
}
Methodology: 2026.01.18
Sts🛰️✗ Istanbul Black Sea Surveillance Zone
Apr 7, 2026 01:15 UTC 85/100 ▼
Vessel A: IMO 9430739 (SRIWANGI III) Singapore
Vessel B: IMO 9693824 (WECO MADELEINE) LIBERIA
  • Minimum Distance: 270 meters
  • Average Distance: 331 meters
  • Duration: 6h 8m
  • Period: 2026-04-07T01:15:34+00:00 to 2026-04-07T07:24:15+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Istanbul Black Sea Surveillance Zone

Confidence Analysis

Score: 85/100

High-confidence STS candidate. Two tankers (SRIWANGI III and WECO MADELEINE) maintained close proximity (min 270m, avg 331m) for 369 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 Eastern Mediterranean Sanctions Monitoring Zone, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness15/25Min distance 270m, avg 331m
Duration25/25Duration 369 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±15m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Eastern Mediterranean Sanctions Monitoring Zone

🛰️ Satellite Corroboration

✗ SAR Not Available

No satellite imagery for this time/location

No Sentinel-1 scenes covering AOI and time window

Searched: 2026-04-07T07:45:04.085621+00:00

Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 563223700,
        "imo": 9430739,
        "name": "SRIWANGI III",
        "flag": "Singapore"
    },
    "vessel_b": {
        "mmsi": 636093045,
        "imo": 9693824,
        "name": "WECO MADELEINE",
        "flag": "LIBERIA"
    },
    "min_distance_m": 270,
    "avg_distance_m": 330.8999999999999772626324556767940521240234375,
    "distance_consistency_m": 15,
    "duration_minutes": 368.69999999999998863131622783839702606201171875,
    "overlap_duration_s": 22121,
    "speed_a_avg": 0.0200000000000000004163336342344337026588618755340576171875,
    "speed_a_std": 0.05000000000000000277555756156289135105907917022705078125,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.0200000000000000004163336342344337026588618755340576171875,
            "max_sog": 0.200000000000000011102230246251565404236316680908203125
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-04-07T01:15:34+00:00",
        "end": "2026-04-07T07:24:15+00:00"
    },
    "points_count": {
        "vessel_a": 19,
        "vessel_b": 19
    },
    "zone_id": "discovered_029",
    "zone_name": "Eastern Mediterranean Sanctions Monitoring Zone",
    "score": {
        "value": 85,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 270m, avg 331m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 369 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very 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: Eastern Mediterranean Sanctions Monitoring Zone"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (SRIWANGI III and WECO MADELEINE) maintained close proximity (min 270m, avg 331m) for 369 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 Eastern Mediterranean Sanctions Monitoring Zone, a known STS activity area."
    },
    "sar": {
        "status": "not_found",
        "centroid": {
            "lat": 34.708953100000002223168849013745784759521484375,
            "lon": 33.3214856999999966546965879388153553009033203125
        },
        "time_window": {
            "start_ts": "2026-04-07T01:15:34+00:00",
            "end_ts": "2026-04-07T07:24:15+00:00"
        },
        "searched_at": "2026-04-07T07:45:04.085621+00:00",
        "notes": "No Sentinel-1 scenes covering AOI and time window"
    }
}
Methodology: 2026.01.18
Sts🛰️✗ Istanbul Black Sea Surveillance Zone
Apr 7, 2026 01:03 UTC 80/100 ▼
Vessel A: IMO 9517288 (ALFA SEA) Panama
Vessel B: IMO 9693824 (WECO MADELEINE) LIBERIA
  • Minimum Distance: 338 meters
  • Average Distance: 346 meters
  • Duration: 6h 12m
  • Period: 2026-04-07T01:03:20+00:00 to 2026-04-07T07:15:24+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Istanbul Black Sea Surveillance Zone

Confidence Analysis

Score: 80/100

High-confidence STS candidate. Two tankers (ALFA SEA and WECO MADELEINE) maintained close proximity (min 338m, avg 346m) for 372 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 Eastern Mediterranean Sanctions Monitoring Zone, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness10/25Min distance 338m, avg 346m
Duration25/25Duration 372 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±5m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Eastern Mediterranean Sanctions Monitoring Zone

🛰️ Satellite Corroboration

✗ SAR Not Available

No satellite imagery for this time/location

No Sentinel-1 scenes covering AOI and time window

Searched: 2026-04-07T07:45:09.224129+00:00

Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 353657000,
        "imo": 9517288,
        "name": "ALFA SEA",
        "flag": "Panama"
    },
    "vessel_b": {
        "mmsi": 636093045,
        "imo": 9693824,
        "name": "WECO MADELEINE",
        "flag": "LIBERIA"
    },
    "min_distance_m": 337.5,
    "avg_distance_m": 345.6000000000000227373675443232059478759765625,
    "distance_consistency_m": 4.70000000000000017763568394002504646778106689453125,
    "duration_minutes": 372.1000000000000227373675443232059478759765625,
    "overlap_duration_s": 22324,
    "speed_a_avg": 0.01000000000000000020816681711721685132943093776702880859375,
    "speed_a_std": 0.0200000000000000004163336342344337026588618755340576171875,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.01000000000000000020816681711721685132943093776702880859375,
            "max_sog": 0.1000000000000000055511151231257827021181583404541015625
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-04-07T01:03:20+00:00",
        "end": "2026-04-07T07:15:24+00:00"
    },
    "points_count": {
        "vessel_a": 61,
        "vessel_b": 61
    },
    "zone_id": "discovered_029",
    "zone_name": "Eastern Mediterranean Sanctions Monitoring Zone",
    "score": {
        "value": 80,
        "components": {
            "distance_tightness": {
                "score": 10,
                "max": 25,
                "detail": "Min distance 338m, avg 346m"
            },
            "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 \u00b15m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Eastern Mediterranean Sanctions Monitoring Zone"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (ALFA SEA and WECO MADELEINE) maintained close proximity (min 338m, avg 346m) for 372 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 Eastern Mediterranean Sanctions Monitoring Zone, a known STS activity area."
    },
    "sar": {
        "status": "not_found",
        "centroid": {
            "lat": 34.7091984999999993988240021280944347381591796875,
            "lon": 33.321354700000000548243406228721141815185546875
        },
        "time_window": {
            "start_ts": "2026-04-07T01:03:20+00:00",
            "end_ts": "2026-04-07T07:15:24+00:00"
        },
        "searched_at": "2026-04-07T07:45:09.224129+00:00",
        "notes": "No Sentinel-1 scenes covering AOI and time window"
    }
}
Methodology: 2026.01.18
Zone Dwell Istanbul Black Sea Surveillance Zone
Apr 7, 2026 01:01 UTC 80.0% ▼
  • Zone: Istanbul Black Sea Surveillance Zone
  • Duration: 6h 33m
  • Data Points: 82 AIS positions
  • Period: 2026-04-07T01:52:21+00:00 to 2026-04-07T08:25:20+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_029",
    "zone_name": "Eastern Mediterranean Sanctions Monitoring Zone",
    "dwell_minutes": 393,
    "points_in_zone": 82,
    "first_point": {
        "ts": "2026-04-07T01:52:21+00:00",
        "lat": 34.7081500000000033878677641041576862335205078125,
        "lon": 33.31996670000000193567757378332316875457763671875
    },
    "last_point": {
        "ts": "2026-04-07T08:25:20+00:00",
        "lat": 34.7081500000000033878677641041576862335205078125,
        "lon": 33.31994999999999862438926356844604015350341796875
    }
}
Methodology: 2026.01.18
Loiter Istanbul Black Sea Surveillance Zone
Apr 7, 2026 01:01 UTC 75.0% ▼
  • Duration: 6h 33m
  • Radius: 7 meters
  • Data Points: 82 AIS positions
  • Centroid: 34.7081, 33.3200
  • Zone: Istanbul Black Sea Surveillance Zone
Show Raw Evidence JSON
{
    "radius_m": 6.70000000000000017763568394002504646778106689453125,
    "duration_minutes": 393,
    "points": 82,
    "centroid": {
        "lat": 34.7081477573170786854461766779422760009765625,
        "lon": 33.3199601792682500445152982138097286224365234375
    },
    "bbox": {
        "min_lat": 34.70811669999999793390088598243892192840576171875,
        "min_lon": 33.31994999999999862438926356844604015350341796875,
        "max_lat": 34.70819999999999794226823723874986171722412109375,
        "max_lon": 33.32003329999999863275661482475697994232177734375
    },
    "zone_id": "discovered_029"
}
Methodology: 2026.01.18
Sts Istanbul Black Sea Surveillance Zone
Apr 7, 2026 00:02 UTC 85/100 ▼
Vessel A: IMO 9517288 (ALFA SEA) Panama
Vessel B: IMO 9693824 (WECO MADELEINE) LIBERIA
  • Minimum Distance: 278 meters
  • Average Distance: 345 meters
  • Duration: 6h 31m
  • Period: 2026-04-07T00:43:32+00:00 to 2026-04-07T07:15:24+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Istanbul Black Sea Surveillance Zone

Confidence Analysis

Score: 85/100

High-confidence STS candidate. Two tankers (ALFA SEA and WECO MADELEINE) maintained close proximity (min 278m, avg 345m) for 392 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 Eastern Mediterranean Sanctions Monitoring Zone, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness15/25Min distance 278m, avg 345m
Duration25/25Duration 392 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±10m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Eastern Mediterranean Sanctions Monitoring Zone
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 353657000,
        "imo": 9517288,
        "name": "ALFA SEA",
        "flag": "Panama"
    },
    "vessel_b": {
        "mmsi": 636093045,
        "imo": 9693824,
        "name": "WECO MADELEINE",
        "flag": "LIBERIA"
    },
    "min_distance_m": 278.3999999999999772626324556767940521240234375,
    "avg_distance_m": 344.6000000000000227373675443232059478759765625,
    "distance_consistency_m": 9.5,
    "duration_minutes": 391.8999999999999772626324556767940521240234375,
    "overlap_duration_s": 23512,
    "speed_a_avg": 0.01000000000000000020816681711721685132943093776702880859375,
    "speed_a_std": 0.0200000000000000004163336342344337026588618755340576171875,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.01000000000000000020816681711721685132943093776702880859375,
            "max_sog": 0.1000000000000000055511151231257827021181583404541015625
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-04-07T00:43:32+00:00",
        "end": "2026-04-07T07:15:24+00:00"
    },
    "points_count": {
        "vessel_a": 66,
        "vessel_b": 66
    },
    "zone_id": "discovered_029",
    "zone_name": "Eastern Mediterranean Sanctions Monitoring Zone",
    "score": {
        "value": 85,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 278m, avg 345m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 392 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b110m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Eastern Mediterranean Sanctions Monitoring Zone"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (ALFA SEA and WECO MADELEINE) maintained close proximity (min 278m, avg 345m) for 392 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 Eastern Mediterranean Sanctions Monitoring Zone, a known STS activity area."
    }
}
Methodology: 2026.01.18
Sts Istanbul Black Sea Surveillance Zone
Apr 7, 2026 00:02 UTC 85/100 ▼
Vessel A: IMO 9430739 (SRIWANGI III) Singapore
Vessel B: IMO 9693824 (WECO MADELEINE) LIBERIA
  • Minimum Distance: 270 meters
  • Average Distance: 333 meters
  • Duration: 6h 30m
  • Period: 2026-04-07T00:41:34+00:00 to 2026-04-07T07:12:14+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Istanbul Black Sea Surveillance Zone

Confidence Analysis

Score: 85/100

High-confidence STS candidate. Two tankers (SRIWANGI III and WECO MADELEINE) maintained close proximity (min 270m, avg 332m) for 391 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 Eastern Mediterranean Sanctions Monitoring Zone, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness15/25Min distance 270m, avg 332m
Duration25/25Duration 391 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±16m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Eastern Mediterranean Sanctions Monitoring Zone
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 563223700,
        "imo": 9430739,
        "name": "SRIWANGI III",
        "flag": "Singapore"
    },
    "vessel_b": {
        "mmsi": 636093045,
        "imo": 9693824,
        "name": "WECO MADELEINE",
        "flag": "LIBERIA"
    },
    "min_distance_m": 270,
    "avg_distance_m": 332.5,
    "distance_consistency_m": 16.39999999999999857891452847979962825775146484375,
    "duration_minutes": 390.69999999999998863131622783839702606201171875,
    "overlap_duration_s": 23440,
    "speed_a_avg": 0.0200000000000000004163336342344337026588618755340576171875,
    "speed_a_std": 0.05000000000000000277555756156289135105907917022705078125,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.0200000000000000004163336342344337026588618755340576171875,
            "max_sog": 0.200000000000000011102230246251565404236316680908203125
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-04-07T00:41:34+00:00",
        "end": "2026-04-07T07:12:14+00:00"
    },
    "points_count": {
        "vessel_a": 19,
        "vessel_b": 19
    },
    "zone_id": "discovered_029",
    "zone_name": "Eastern Mediterranean Sanctions Monitoring Zone",
    "score": {
        "value": 85,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 270m, avg 332m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 391 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b116m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Eastern Mediterranean Sanctions Monitoring Zone"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (SRIWANGI III and WECO MADELEINE) maintained close proximity (min 270m, avg 332m) for 391 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 Eastern Mediterranean Sanctions Monitoring Zone, a known STS activity area."
    }
}
Methodology: 2026.01.18
Zone Dwell Istanbul Black Sea Surveillance Zone
Apr 7, 2026 00:01 UTC 80.0% ▼
  • Zone: Istanbul Black Sea Surveillance Zone
  • Duration: 6h 32m
  • Data Points: 94 AIS positions
  • Period: 2026-04-07T00:52:22+00:00 to 2026-04-07T07:25:18+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_029",
    "zone_name": "Eastern Mediterranean Sanctions Monitoring Zone",
    "dwell_minutes": 392.8999999999999772626324556767940521240234375,
    "points_in_zone": 94,
    "first_point": {
        "ts": "2026-04-07T00:52:22+00:00",
        "lat": 34.70811669999999793390088598243892192840576171875,
        "lon": 33.31996670000000193567757378332316875457763671875
    },
    "last_point": {
        "ts": "2026-04-07T07:25:18+00:00",
        "lat": 34.7081500000000033878677641041576862335205078125,
        "lon": 33.31996670000000193567757378332316875457763671875
    }
}
Methodology: 2026.01.18
Loiter Istanbul Black Sea Surveillance Zone
Apr 7, 2026 00:01 UTC 75.0% ▼
  • Duration: 6h 32m
  • Radius: 7 meters
  • Data Points: 94 AIS positions
  • Centroid: 34.7081, 33.3200
  • Zone: Istanbul Black Sea Surveillance Zone
Show Raw Evidence JSON
{
    "radius_m": 6.79999999999999982236431605997495353221893310546875,
    "duration_minutes": 392.8999999999999772626324556767940521240234375,
    "points": 94,
    "centroid": {
        "lat": 34.7081476893616951429066830314695835113525390625,
        "lon": 33.31995941276593242719172849319875240325927734375
    },
    "bbox": {
        "min_lat": 34.70811669999999793390088598243892192840576171875,
        "min_lon": 33.31994999999999862438926356844604015350341796875,
        "max_lat": 34.70819999999999794226823723874986171722412109375,
        "max_lon": 33.32003329999999863275661482475697994232177734375
    },
    "zone_id": "discovered_029"
}
Methodology: 2026.01.18
Sts Istanbul Black Sea Surveillance Zone
Apr 6, 2026 23:08 UTC 82/100 ▼
Vessel A: IMO 9430739 (SRIWANGI III) Singapore
Vessel B: IMO 9693824 (WECO MADELEINE) LIBERIA
  • Minimum Distance: 270 meters
  • Average Distance: 339 meters
  • Duration: 6h 30m
  • Period: 2026-04-06T23:32:47+00:00 to 2026-04-07T06:03:07+00:00
  • Vessel A Avg Speed: 0.1 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Istanbul Black Sea Surveillance Zone

Confidence Analysis

Score: 82/100

High-confidence STS candidate. Two tankers (SRIWANGI III and WECO MADELEINE) maintained close proximity (min 270m, avg 339m) for 390 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 Eastern Mediterranean Sanctions Monitoring Zone, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness15/25Min distance 270m, avg 339m
Duration25/25Duration 390 minutes
Speed Stability17/20both nearly stationary; stable speeds
Distance Consistency15/15Distance variance ±29m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Eastern Mediterranean Sanctions Monitoring Zone
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 563223700,
        "imo": 9430739,
        "name": "SRIWANGI III",
        "flag": "Singapore"
    },
    "vessel_b": {
        "mmsi": 636093045,
        "imo": 9693824,
        "name": "WECO MADELEINE",
        "flag": "LIBERIA"
    },
    "min_distance_m": 270,
    "avg_distance_m": 338.69999999999998863131622783839702606201171875,
    "distance_consistency_m": 29.39999999999999857891452847979962825775146484375,
    "duration_minutes": 390.30000000000001136868377216160297393798828125,
    "overlap_duration_s": 23420,
    "speed_a_avg": 0.1000000000000000055511151231257827021181583404541015625,
    "speed_a_std": 0.419999999999999984456877655247808434069156646728515625,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.1000000000000000055511151231257827021181583404541015625,
            "max_sog": 2
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-04-06T23:32:47+00:00",
        "end": "2026-04-07T06:03:07+00:00"
    },
    "points_count": {
        "vessel_a": 23,
        "vessel_b": 23
    },
    "zone_id": "discovered_029",
    "zone_name": "Eastern Mediterranean Sanctions Monitoring Zone",
    "score": {
        "value": 82,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 270m, avg 339m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 390 minutes"
            },
            "speed_stability": {
                "score": 17,
                "max": 20,
                "detail": "both nearly stationary; stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b129m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Eastern Mediterranean Sanctions Monitoring Zone"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (SRIWANGI III and WECO MADELEINE) maintained close proximity (min 270m, avg 339m) for 390 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 Eastern Mediterranean Sanctions Monitoring Zone, a known STS activity area."
    }
}
Methodology: 2026.01.18
Sts Istanbul Black Sea Surveillance Zone
Apr 6, 2026 23:04 UTC 85/100 ▼
Vessel A: IMO 9517288 (ALFA SEA) Panama
Vessel B: IMO 9693824 (WECO MADELEINE) LIBERIA
  • Minimum Distance: 278 meters
  • Average Distance: 345 meters
  • Duration: 6h 31m
  • Period: 2026-04-06T23:40:23+00:00 to 2026-04-07T06:12:16+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Istanbul Black Sea Surveillance Zone

Confidence Analysis

Score: 85/100

High-confidence STS candidate. Two tankers (ALFA SEA and WECO MADELEINE) maintained close proximity (min 278m, avg 345m) for 392 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 Eastern Mediterranean Sanctions Monitoring Zone, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness15/25Min distance 278m, avg 345m
Duration25/25Duration 392 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±10m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Eastern Mediterranean Sanctions Monitoring Zone
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 353657000,
        "imo": 9517288,
        "name": "ALFA SEA",
        "flag": "Panama"
    },
    "vessel_b": {
        "mmsi": 636093045,
        "imo": 9693824,
        "name": "WECO MADELEINE",
        "flag": "LIBERIA"
    },
    "min_distance_m": 278.3999999999999772626324556767940521240234375,
    "avg_distance_m": 344.80000000000001136868377216160297393798828125,
    "distance_consistency_m": 9.699999999999999289457264239899814128875732421875,
    "duration_minutes": 391.8999999999999772626324556767940521240234375,
    "overlap_duration_s": 23513,
    "speed_a_avg": 0.01000000000000000020816681711721685132943093776702880859375,
    "speed_a_std": 0.040000000000000000832667268468867405317723751068115234375,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.01000000000000000020816681711721685132943093776702880859375,
            "max_sog": 0.299999999999999988897769753748434595763683319091796875
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-04-06T23:40:23+00:00",
        "end": "2026-04-07T06:12:16+00:00"
    },
    "points_count": {
        "vessel_a": 70,
        "vessel_b": 70
    },
    "zone_id": "discovered_029",
    "zone_name": "Eastern Mediterranean Sanctions Monitoring Zone",
    "score": {
        "value": 85,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 278m, avg 345m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 392 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b110m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Eastern Mediterranean Sanctions Monitoring Zone"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (ALFA SEA and WECO MADELEINE) maintained close proximity (min 278m, avg 345m) for 392 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 Eastern Mediterranean Sanctions Monitoring Zone, a known STS activity area."
    }
}
Methodology: 2026.01.18
Zone Dwell Istanbul Black Sea Surveillance Zone
Apr 6, 2026 23:01 UTC 80.0% ▼
  • Zone: Istanbul Black Sea Surveillance Zone
  • Duration: 6h 36m
  • Data Points: 103 AIS positions
  • Period: 2026-04-06T23:40:23+00:00 to 2026-04-07T06:16:21+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_029",
    "zone_name": "Eastern Mediterranean Sanctions Monitoring Zone",
    "dwell_minutes": 396,
    "points_in_zone": 103,
    "first_point": {
        "ts": "2026-04-06T23:40:23+00:00",
        "lat": 34.7081500000000033878677641041576862335205078125,
        "lon": 33.31994999999999862438926356844604015350341796875
    },
    "last_point": {
        "ts": "2026-04-07T06:16:21+00:00",
        "lat": 34.7081333000000000765794538892805576324462890625,
        "lon": 33.31994999999999862438926356844604015350341796875
    }
}
Methodology: 2026.01.18
Loiter Istanbul Black Sea Surveillance Zone
Apr 6, 2026 23:01 UTC 75.0% ▼
  • Duration: 6h 36m
  • Radius: 7 meters
  • Data Points: 103 AIS positions
  • Centroid: 34.7081, 33.3200
  • Zone: Istanbul Black Sea Surveillance Zone
Show Raw Evidence JSON
{
    "radius_m": 6.9000000000000003552713678800500929355621337890625,
    "duration_minutes": 396,
    "points": 103,
    "centroid": {
        "lat": 34.7081493504854137199799879454076290130615234375,
        "lon": 33.31995842621356729296167031861841678619384765625
    },
    "bbox": {
        "min_lat": 34.70811669999999793390088598243892192840576171875,
        "min_lon": 33.31994999999999862438926356844604015350341796875,
        "max_lat": 34.70819999999999794226823723874986171722412109375,
        "max_lon": 33.32003329999999863275661482475697994232177734375
    },
    "zone_id": "discovered_029"
}
Methodology: 2026.01.18
Sts Istanbul Black Sea Surveillance Zone
Apr 6, 2026 22:11 UTC 82/100 ▼
Vessel A: IMO 9430739 (SRIWANGI III) Singapore
Vessel B: IMO 9693824 (WECO MADELEINE) LIBERIA
  • Minimum Distance: 270 meters
  • Average Distance: 338 meters
  • Duration: 6h 21m
  • Period: 2026-04-06T22:26:44+00:00 to 2026-04-07T04:48:14+00:00
  • Vessel A Avg Speed: 0.1 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Istanbul Black Sea Surveillance Zone

Confidence Analysis

Score: 82/100

High-confidence STS candidate. Two tankers (SRIWANGI III and WECO MADELEINE) maintained close proximity (min 270m, avg 338m) for 382 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 Eastern Mediterranean Sanctions Monitoring Zone, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness15/25Min distance 270m, avg 338m
Duration25/25Duration 382 minutes
Speed Stability17/20both nearly stationary; stable speeds
Distance Consistency15/15Distance variance ±28m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Eastern Mediterranean Sanctions Monitoring Zone
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 563223700,
        "imo": 9430739,
        "name": "SRIWANGI III",
        "flag": "Singapore"
    },
    "vessel_b": {
        "mmsi": 636093045,
        "imo": 9693824,
        "name": "WECO MADELEINE",
        "flag": "LIBERIA"
    },
    "min_distance_m": 270,
    "avg_distance_m": 338,
    "distance_consistency_m": 27.699999999999999289457264239899814128875732421875,
    "duration_minutes": 381.5,
    "overlap_duration_s": 22890,
    "speed_a_avg": 0.0899999999999999966693309261245303787291049957275390625,
    "speed_a_std": 0.39000000000000001332267629550187848508358001708984375,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.0899999999999999966693309261245303787291049957275390625,
            "max_sog": 2
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-04-06T22:26:44+00:00",
        "end": "2026-04-07T04:48:14+00:00"
    },
    "points_count": {
        "vessel_a": 26,
        "vessel_b": 26
    },
    "zone_id": "discovered_029",
    "zone_name": "Eastern Mediterranean Sanctions Monitoring Zone",
    "score": {
        "value": 82,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 270m, avg 338m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 382 minutes"
            },
            "speed_stability": {
                "score": 17,
                "max": 20,
                "detail": "both nearly stationary; stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b128m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Eastern Mediterranean Sanctions Monitoring Zone"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (SRIWANGI III and WECO MADELEINE) maintained close proximity (min 270m, avg 338m) for 382 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 Eastern Mediterranean Sanctions Monitoring Zone, a known STS activity area."
    }
}
Methodology: 2026.01.18
Sts Istanbul Black Sea Surveillance Zone
Apr 6, 2026 22:01 UTC 85/100 ▼
Vessel A: IMO 9517288 (ALFA SEA) Panama
Vessel B: IMO 9693824 (WECO MADELEINE) LIBERIA
  • Minimum Distance: 278 meters
  • Average Distance: 345 meters
  • Duration: 6h 32m
  • Period: 2026-04-06T22:46:21+00:00 to 2026-04-07T05:18:19+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Istanbul Black Sea Surveillance Zone

Confidence Analysis

Score: 85/100

High-confidence STS candidate. Two tankers (ALFA SEA and WECO MADELEINE) maintained close proximity (min 278m, avg 345m) for 392 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 Eastern Mediterranean Sanctions Monitoring Zone, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness15/25Min distance 278m, avg 345m
Duration25/25Duration 392 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±9m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Eastern Mediterranean Sanctions Monitoring Zone
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 353657000,
        "imo": 9517288,
        "name": "ALFA SEA",
        "flag": "Panama"
    },
    "vessel_b": {
        "mmsi": 636093045,
        "imo": 9693824,
        "name": "WECO MADELEINE",
        "flag": "LIBERIA"
    },
    "min_distance_m": 278.3999999999999772626324556767940521240234375,
    "avg_distance_m": 344.8999999999999772626324556767940521240234375,
    "distance_consistency_m": 9.4000000000000003552713678800500929355621337890625,
    "duration_minutes": 392,
    "overlap_duration_s": 23518,
    "speed_a_avg": 0.01000000000000000020816681711721685132943093776702880859375,
    "speed_a_std": 0.05000000000000000277555756156289135105907917022705078125,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.01000000000000000020816681711721685132943093776702880859375,
            "max_sog": 0.299999999999999988897769753748434595763683319091796875
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-04-06T22:46:21+00:00",
        "end": "2026-04-07T05:18:19+00:00"
    },
    "points_count": {
        "vessel_a": 75,
        "vessel_b": 75
    },
    "zone_id": "discovered_029",
    "zone_name": "Eastern Mediterranean Sanctions Monitoring Zone",
    "score": {
        "value": 85,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 278m, avg 345m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 392 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: Eastern Mediterranean Sanctions Monitoring Zone"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (ALFA SEA and WECO MADELEINE) maintained close proximity (min 278m, avg 345m) for 392 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 Eastern Mediterranean Sanctions Monitoring Zone, a known STS activity area."
    }
}
Methodology: 2026.01.18
Zone Dwell Istanbul Black Sea Surveillance Zone
Apr 6, 2026 22:01 UTC 80.0% ▼
  • Zone: Istanbul Black Sea Surveillance Zone
  • Duration: 6h 33m
  • Data Points: 106 AIS positions
  • Period: 2026-04-06T22:52:20+00:00 to 2026-04-07T05:25:21+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_029",
    "zone_name": "Eastern Mediterranean Sanctions Monitoring Zone",
    "dwell_minutes": 393,
    "points_in_zone": 106,
    "first_point": {
        "ts": "2026-04-06T22:52:20+00:00",
        "lat": 34.7081500000000033878677641041576862335205078125,
        "lon": 33.31996670000000193567757378332316875457763671875
    },
    "last_point": {
        "ts": "2026-04-07T05:25:21+00:00",
        "lat": 34.7081333000000000765794538892805576324462890625,
        "lon": 33.31996670000000193567757378332316875457763671875
    }
}
Methodology: 2026.01.18
Loiter Istanbul Black Sea Surveillance Zone
Apr 6, 2026 22:01 UTC 75.0% ▼
  • Duration: 6h 33m
  • Radius: 7 meters
  • Data Points: 106 AIS positions
  • Centroid: 34.7082, 33.3200
  • Zone: Istanbul Black Sea Surveillance Zone
Show Raw Evidence JSON
{
    "radius_m": 6.9000000000000003552713678800500929355621337890625,
    "duration_minutes": 393,
    "points": 106,
    "centroid": {
        "lat": 34.70815031415093443456498789601027965545654296875,
        "lon": 33.3199583452830125906984903849661350250244140625
    },
    "bbox": {
        "min_lat": 34.70811669999999793390088598243892192840576171875,
        "min_lon": 33.31994999999999862438926356844604015350341796875,
        "max_lat": 34.70819999999999794226823723874986171722412109375,
        "max_lon": 33.32003329999999863275661482475697994232177734375
    },
    "zone_id": "discovered_029"
}
Methodology: 2026.01.18
Sts Istanbul Black Sea Surveillance Zone
Apr 6, 2026 21:02 UTC 82/100 ▼
Vessel A: IMO 9430739 (SRIWANGI III) Singapore
Vessel B: IMO 9693824 (WECO MADELEINE) LIBERIA
  • Minimum Distance: 270 meters
  • Average Distance: 338 meters
  • Duration: 6h 15m
  • Period: 2026-04-06T21:26:47+00:00 to 2026-04-07T03:42:08+00:00
  • Vessel A Avg Speed: 0.1 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Istanbul Black Sea Surveillance Zone

Confidence Analysis

Score: 82/100

High-confidence STS candidate. Two tankers (SRIWANGI III and WECO MADELEINE) maintained close proximity (min 270m, avg 338m) for 375 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 Eastern Mediterranean Sanctions Monitoring Zone, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness15/25Min distance 270m, avg 338m
Duration25/25Duration 375 minutes
Speed Stability17/20both nearly stationary; stable speeds
Distance Consistency15/15Distance variance ±28m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Eastern Mediterranean Sanctions Monitoring Zone
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 563223700,
        "imo": 9430739,
        "name": "SRIWANGI III",
        "flag": "Singapore"
    },
    "vessel_b": {
        "mmsi": 636093045,
        "imo": 9693824,
        "name": "WECO MADELEINE",
        "flag": "LIBERIA"
    },
    "min_distance_m": 270,
    "avg_distance_m": 338.1000000000000227373675443232059478759765625,
    "distance_consistency_m": 28.300000000000000710542735760100185871124267578125,
    "duration_minutes": 375.3999999999999772626324556767940521240234375,
    "overlap_duration_s": 22521,
    "speed_a_avg": 0.0899999999999999966693309261245303787291049957275390625,
    "speed_a_std": 0.40000000000000002220446049250313080847263336181640625,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.0899999999999999966693309261245303787291049957275390625,
            "max_sog": 2
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-04-06T21:26:47+00:00",
        "end": "2026-04-07T03:42:08+00:00"
    },
    "points_count": {
        "vessel_a": 25,
        "vessel_b": 25
    },
    "zone_id": "discovered_029",
    "zone_name": "Eastern Mediterranean Sanctions Monitoring Zone",
    "score": {
        "value": 82,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 270m, avg 338m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 375 minutes"
            },
            "speed_stability": {
                "score": 17,
                "max": 20,
                "detail": "both nearly stationary; stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b128m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Eastern Mediterranean Sanctions Monitoring Zone"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (SRIWANGI III and WECO MADELEINE) maintained close proximity (min 270m, avg 338m) for 375 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 Eastern Mediterranean Sanctions Monitoring Zone, a known STS activity area."
    }
}
Methodology: 2026.01.18
Sts Istanbul Black Sea Surveillance Zone
Apr 6, 2026 21:01 UTC 85/100 ▼
Vessel A: IMO 9517288 (ALFA SEA) Panama
Vessel B: IMO 9693824 (WECO MADELEINE) LIBERIA
  • Minimum Distance: 278 meters
  • Average Distance: 345 meters
  • Duration: 6h 28m
  • Period: 2026-04-06T21:46:27+00:00 to 2026-04-07T04:15:22+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Istanbul Black Sea Surveillance Zone

Confidence Analysis

Score: 85/100

High-confidence STS candidate. Two tankers (ALFA SEA and WECO MADELEINE) maintained close proximity (min 278m, avg 345m) for 389 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 Eastern Mediterranean Sanctions Monitoring Zone, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness15/25Min distance 278m, avg 345m
Duration25/25Duration 389 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±9m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Eastern Mediterranean Sanctions Monitoring Zone
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 353657000,
        "imo": 9517288,
        "name": "ALFA SEA",
        "flag": "Panama"
    },
    "vessel_b": {
        "mmsi": 636093045,
        "imo": 9693824,
        "name": "WECO MADELEINE",
        "flag": "LIBERIA"
    },
    "min_distance_m": 278.3999999999999772626324556767940521240234375,
    "avg_distance_m": 345,
    "distance_consistency_m": 9.300000000000000710542735760100185871124267578125,
    "duration_minutes": 388.8999999999999772626324556767940521240234375,
    "overlap_duration_s": 23335,
    "speed_a_avg": 0.01000000000000000020816681711721685132943093776702880859375,
    "speed_a_std": 0.040000000000000000832667268468867405317723751068115234375,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.01000000000000000020816681711721685132943093776702880859375,
            "max_sog": 0.299999999999999988897769753748434595763683319091796875
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-04-06T21:46:27+00:00",
        "end": "2026-04-07T04:15:22+00:00"
    },
    "points_count": {
        "vessel_a": 75,
        "vessel_b": 75
    },
    "zone_id": "discovered_029",
    "zone_name": "Eastern Mediterranean Sanctions Monitoring Zone",
    "score": {
        "value": 85,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 278m, avg 345m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 389 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: Eastern Mediterranean Sanctions Monitoring Zone"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (ALFA SEA and WECO MADELEINE) maintained close proximity (min 278m, avg 345m) for 389 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 Eastern Mediterranean Sanctions Monitoring Zone, a known STS activity area."
    }
}
Methodology: 2026.01.18
Zone Dwell Istanbul Black Sea Surveillance Zone
Apr 6, 2026 21:01 UTC 80.0% ▼
  • Zone: Istanbul Black Sea Surveillance Zone
  • Duration: 6h 36m
  • Data Points: 106 AIS positions
  • Period: 2026-04-06T21:52:20+00:00 to 2026-04-07T04:28:24+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_029",
    "zone_name": "Eastern Mediterranean Sanctions Monitoring Zone",
    "dwell_minutes": 396.1000000000000227373675443232059478759765625,
    "points_in_zone": 106,
    "first_point": {
        "ts": "2026-04-06T21:52:20+00:00",
        "lat": 34.7081500000000033878677641041576862335205078125,
        "lon": 33.31996670000000193567757378332316875457763671875
    },
    "last_point": {
        "ts": "2026-04-07T04:28:24+00:00",
        "lat": 34.7081500000000033878677641041576862335205078125,
        "lon": 33.31996670000000193567757378332316875457763671875
    }
}
Methodology: 2026.01.18
Loiter Istanbul Black Sea Surveillance Zone
Apr 6, 2026 21:01 UTC 75.0% ▼
  • Duration: 6h 36m
  • Radius: 7 meters
  • Data Points: 106 AIS positions
  • Centroid: 34.7082, 33.3200
  • Zone: Istanbul Black Sea Surveillance Zone
Show Raw Evidence JSON
{
    "radius_m": 6.9000000000000003552713678800500929355621337890625,
    "duration_minutes": 396.1000000000000227373675443232059478759765625,
    "points": 106,
    "centroid": {
        "lat": 34.7081525188679052007501013576984405517578125,
        "lon": 33.31995834528303390698056318797171115875244140625
    },
    "bbox": {
        "min_lat": 34.70811669999999793390088598243892192840576171875,
        "min_lon": 33.31994999999999862438926356844604015350341796875,
        "max_lat": 34.70819999999999794226823723874986171722412109375,
        "max_lon": 33.32003329999999863275661482475697994232177734375
    },
    "zone_id": "discovered_029"
}
Methodology: 2026.01.18
Zone Dwell Istanbul Black Sea Surveillance Zone
Apr 6, 2026 20:01 UTC 80.0% ▼
  • Zone: Istanbul Black Sea Surveillance Zone
  • Duration: 6h 33m
  • Data Points: 99 AIS positions
  • Period: 2026-04-06T20:55:20+00:00 to 2026-04-07T03:28:24+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_029",
    "zone_name": "Eastern Mediterranean Sanctions Monitoring Zone",
    "dwell_minutes": 393.1000000000000227373675443232059478759765625,
    "points_in_zone": 99,
    "first_point": {
        "ts": "2026-04-06T20:55:20+00:00",
        "lat": 34.7081500000000033878677641041576862335205078125,
        "lon": 33.31996670000000193567757378332316875457763671875
    },
    "last_point": {
        "ts": "2026-04-07T03:28:24+00:00",
        "lat": 34.7081500000000033878677641041576862335205078125,
        "lon": 33.31994999999999862438926356844604015350341796875
    }
}
Methodology: 2026.01.18
Loiter Istanbul Black Sea Surveillance Zone
Apr 6, 2026 20:01 UTC 75.0% ▼
  • Duration: 6h 33m
  • Radius: 7 meters
  • Data Points: 99 AIS positions
  • Centroid: 34.7082, 33.3200
  • Zone: Istanbul Black Sea Surveillance Zone
Show Raw Evidence JSON
{
    "radius_m": 6.70000000000000017763568394002504646778106689453125,
    "duration_minutes": 393.1000000000000227373675443232059478759765625,
    "points": 99,
    "centroid": {
        "lat": 34.70815202222220108296824037097394466400146484375,
        "lon": 33.31996028484849148298962973058223724365234375
    },
    "bbox": {
        "min_lat": 34.70811669999999793390088598243892192840576171875,
        "min_lon": 33.31994999999999862438926356844604015350341796875,
        "max_lat": 34.70819999999999794226823723874986171722412109375,
        "max_lon": 33.32003329999999863275661482475697994232177734375
    },
    "zone_id": "discovered_029"
}
Methodology: 2026.01.18
Sts Istanbul Black Sea Surveillance Zone
Apr 6, 2026 20:01 UTC 85/100 ▼
Vessel A: IMO 9517288 (ALFA SEA) Panama
Vessel B: IMO 9693824 (WECO MADELEINE) LIBERIA
  • Minimum Distance: 278 meters
  • Average Distance: 345 meters
  • Duration: 6h 23m
  • Period: 2026-04-06T20:55:20+00:00 to 2026-04-07T03:18:36+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Istanbul Black Sea Surveillance Zone

Confidence Analysis

Score: 85/100

High-confidence STS candidate. Two tankers (ALFA SEA and WECO MADELEINE) maintained close proximity (min 278m, avg 345m) for 383 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 Eastern Mediterranean Sanctions Monitoring Zone, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness15/25Min distance 278m, avg 345m
Duration25/25Duration 383 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±9m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Eastern Mediterranean Sanctions Monitoring Zone
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 353657000,
        "imo": 9517288,
        "name": "ALFA SEA",
        "flag": "Panama"
    },
    "vessel_b": {
        "mmsi": 636093045,
        "imo": 9693824,
        "name": "WECO MADELEINE",
        "flag": "LIBERIA"
    },
    "min_distance_m": 278.3999999999999772626324556767940521240234375,
    "avg_distance_m": 345,
    "distance_consistency_m": 9.199999999999999289457264239899814128875732421875,
    "duration_minutes": 383.30000000000001136868377216160297393798828125,
    "overlap_duration_s": 22996,
    "speed_a_avg": 0.0200000000000000004163336342344337026588618755340576171875,
    "speed_a_std": 0.05000000000000000277555756156289135105907917022705078125,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.0200000000000000004163336342344337026588618755340576171875,
            "max_sog": 0.299999999999999988897769753748434595763683319091796875
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-04-06T20:55:20+00:00",
        "end": "2026-04-07T03:18:36+00:00"
    },
    "points_count": {
        "vessel_a": 78,
        "vessel_b": 78
    },
    "zone_id": "discovered_029",
    "zone_name": "Eastern Mediterranean Sanctions Monitoring Zone",
    "score": {
        "value": 85,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 278m, avg 345m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 383 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: Eastern Mediterranean Sanctions Monitoring Zone"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (ALFA SEA and WECO MADELEINE) maintained close proximity (min 278m, avg 345m) for 383 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 Eastern Mediterranean Sanctions Monitoring Zone, a known STS activity area."
    }
}
Methodology: 2026.01.18

Recent Position Data

Time (UTC) Lat Lon Speed Course Zone
Sep 6 03:12 2.2239 101.8566 12.3 kn 116.1° Central Mediterranean Sanctioned Vessel Zone
Sep 6 03:06 2.2332 101.8385 12.4 kn 119.7° Central Mediterranean Sanctioned Vessel Zone
Sep 6 03:03 2.2395 101.8283 12.3 kn 119.9° Central Mediterranean Sanctioned Vessel Zone
Sep 6 03:01 2.2435 101.8222 12.4 kn 124.4° Central Mediterranean Sanctioned Vessel Zone
Sep 6 02:43 2.2808 101.7728 12.7 kn 126.4° Central Mediterranean Sanctioned Vessel Zone
Sep 6 02:41 2.2844 101.7683 12.6 kn 127.6° Central Mediterranean Sanctioned Vessel Zone
Sep 6 02:40 2.2862 101.7660 12.6 kn 127.0° Central Mediterranean Sanctioned Vessel Zone
Sep 6 02:30 2.3062 101.7375 12.6 kn 126.7° Central Mediterranean Sanctioned Vessel Zone

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.