RIKER

IMO 9253909

Vessel information

Vessel Name RIKER View name history 📜
IMO Number 9253909
MMSI 511100897
Vessel Type Crude Oil Tanker | Pétrolier de brut
Flag 🇸🇱 Sierra leone View flag history 📜
Call Sign T8A4118
Gross Tonnage 79,525 GT
Year Built 2002

Sanctioned by

🇬🇧 UK 2025-05-20

Company & Ownership

🏢
James Navigation SA
IMO Company: 6373923
Address C/O: Gama Link Tech Services Co Unit A, 2nd Floor, Plot 112, Udyog Vihar, Gurugram, Haryana, 122016, India.
Status Active
Fleet 1.0 owner, 0.0 operator, 0.0 manager, 0.0 beneficial

Management & Operations

ISM Manager
UNKNOWN
Unknown
Commercial Manager
RIKER NAVIGATION LTD
123 Fifth Avenue, NY 10160, New York, USA
Registered Owner
JAMES NAVIGATION SA
Trust Company Complex, Ajeltake Road, Ajeltake, Majuro MH 96960, Marshall Islands.

Classification & Safety

Current Classification
DNV-GL (ex GL) (IACS) Delivered

Port State Control (PSC) Inspections

⚠️
Risk Level
HIGH
Last 36 Months
6
Inspections
2
Detentions
Last Inspection
📍 Rizhao
📅 2025-10-11

Survey Renewal & Certificates

Code Type Issuer Issued Expires
533 Maritime Labour Certificate RINA Services S.p.A. (RINA) (186) 29/04/2024 29/04/2029
510 Safety Management Certificate RINA Services S.p.A. (RINA) (186) 29/04/2024 29/04/2029

Programs & Notes

SEMA (Canada) — vessel designations | The Russia (Sanctions) (EU Exit) Regulations 2019

DateDesignated: 2025-05-20 | Shipping sanctions: (see “Other information”) | Shipping sanctions: a specified ship is prohibited from being provided with access to or having its master or pilot cause it to enter a port in the UK, may have its registration on the UK Ship Register terminated, and a master or pilot of a specified ship may be given a port barring direction, a detention direction, and a port entry direction or a movement direction. | IMO 9253909 (“JAMES II”) is involved in activity whose object or effect is to destabilise Ukraine or undermine or threaten the territorial integrity, sovereignty or independence of Ukraine or to obtain a benefit from or support the Government of Russia. Namely, IMO 9253909 is involved in carrying oil or oil products that originated in Russia from Russia to a third country.

Vessel Changes

10 changes

AIS Events

50 events detected • 2 zones • Last: Sep 4, 2026

Loiter Bosphorus/Dardanelles Approach Sep 4, 2026 23:10 UTC 75.0%
  • Duration: 3h 57m
  • Radius: 3 meters
  • Data Points: 10 AIS positions
  • Centroid: 40.7020, 29.4594
  • Zone: Bosphorus/Dardanelles Approach
Show Raw Evidence JSON
{
    "radius_m": 3,
    "duration_minutes": 237,
    "points": 10,
    "centroid": {
        "lat": 40.70200715000000712961991666816174983978271484375,
        "lon": 29.459398169999996497381289373151957988739013671875
    },
    "bbox": {
        "min_lat": 40.70199000000000211230144486762583255767822265625,
        "min_lon": 29.45937669999999997116901795379817485809326171875,
        "max_lat": 40.70202330000000046084096538834273815155029296875,
        "max_lon": 29.459430000000001115267878049053251743316650390625
    },
    "zone_id": "osint_bosphorus"
}

Methodology: 2026.01.18

Zone Dwell Bosphorus/Dardanelles Approach Sep 4, 2026 23:10 UTC 80.0%
  • Zone: Bosphorus/Dardanelles Approach
  • Duration: 3h 57m
  • Data Points: 10 AIS positions
  • Period: 2026-09-04T23:10:37+00:00 to 2026-09-05T03:07:37+00:00
Show Raw Evidence JSON
{
    "zone_id": "osint_bosphorus",
    "zone_name": "Bosphorus\/Dardanelles Approach",
    "dwell_minutes": 237,
    "points_in_zone": 10,
    "first_point": {
        "ts": "2026-09-04T23:10:37+00:00",
        "lat": 40.7019982999999996309270500205457210540771484375,
        "lon": 29.4593832999999989397110766731202602386474609375
    },
    "last_point": {
        "ts": "2026-09-05T03:07:37+00:00",
        "lat": 40.70199000000000211230144486762583255767822265625,
        "lon": 29.45937669999999997116901795379817485809326171875
    }
}

Methodology: 2026.01.18

Loiter Bosphorus/Dardanelles Approach Sep 4, 2026 22:07 UTC 75.0%
  • Duration: 5 hours
  • Radius: 3 meters
  • Data Points: 13 AIS positions
  • Centroid: 40.7020, 29.4594
  • Zone: Bosphorus/Dardanelles Approach
Show Raw Evidence JSON
{
    "radius_m": 2.899999999999999911182158029987476766109466552734375,
    "duration_minutes": 300,
    "points": 13,
    "centroid": {
        "lat": 40.70200883846154482625934178940951824188232421875,
        "lon": 29.459398592307689312974616768769919872283935546875
    },
    "bbox": {
        "min_lat": 40.70199000000000211230144486762583255767822265625,
        "min_lon": 29.45937669999999997116901795379817485809326171875,
        "max_lat": 40.70202330000000046084096538834273815155029296875,
        "max_lon": 29.459430000000001115267878049053251743316650390625
    },
    "zone_id": "osint_bosphorus"
}

Methodology: 2026.01.18

Zone Dwell Bosphorus/Dardanelles Approach Sep 4, 2026 22:07 UTC 80.0%
  • Zone: Bosphorus/Dardanelles Approach
  • Duration: 5 hours
  • Data Points: 13 AIS positions
  • Period: 2026-09-04T22:07:37+00:00 to 2026-09-05T03:07:37+00:00
Show Raw Evidence JSON
{
    "zone_id": "osint_bosphorus",
    "zone_name": "Bosphorus\/Dardanelles Approach",
    "dwell_minutes": 300,
    "points_in_zone": 13,
    "first_point": {
        "ts": "2026-09-04T22:07:37+00:00",
        "lat": 40.7020217000000030793671612627804279327392578125,
        "lon": 29.45940999999999831970853847451508045196533203125
    },
    "last_point": {
        "ts": "2026-09-05T03:07:37+00:00",
        "lat": 40.70199000000000211230144486762583255767822265625,
        "lon": 29.45937669999999997116901795379817485809326171875
    }
}

Methodology: 2026.01.18

Loiter Bosphorus/Dardanelles Approach Sep 4, 2026 21:25 UTC 75.0%
  • Duration: 5h 42m
  • Radius: 3 meters
  • Data Points: 14 AIS positions
  • Centroid: 40.7020, 29.4594
  • Zone: Bosphorus/Dardanelles Approach
Show Raw Evidence JSON
{
    "radius_m": 2.899999999999999911182158029987476766109466552734375,
    "duration_minutes": 342,
    "points": 14,
    "centroid": {
        "lat": 40.7020084428571493617710075341165065765380859375,
        "lon": 29.45940060000000215723048313520848751068115234375
    },
    "bbox": {
        "min_lat": 40.70199000000000211230144486762583255767822265625,
        "min_lon": 29.45937669999999997116901795379817485809326171875,
        "max_lat": 40.70202330000000046084096538834273815155029296875,
        "max_lon": 29.459430000000001115267878049053251743316650390625
    },
    "zone_id": "osint_bosphorus"
}

Methodology: 2026.01.18

Zone Dwell Bosphorus/Dardanelles Approach Sep 4, 2026 21:25 UTC 80.0%
  • Zone: Bosphorus/Dardanelles Approach
  • Duration: 5h 42m
  • Data Points: 14 AIS positions
  • Period: 2026-09-04T21:25:38+00:00 to 2026-09-05T03:07:37+00:00
Show Raw Evidence JSON
{
    "zone_id": "osint_bosphorus",
    "zone_name": "Bosphorus\/Dardanelles Approach",
    "dwell_minutes": 342,
    "points_in_zone": 14,
    "first_point": {
        "ts": "2026-09-04T21:25:38+00:00",
        "lat": 40.7020033000000012179953046143054962158203125,
        "lon": 29.45942670000000163099684868939220905303955078125
    },
    "last_point": {
        "ts": "2026-09-05T03:07:37+00:00",
        "lat": 40.70199000000000211230144486762583255767822265625,
        "lon": 29.45937669999999997116901795379817485809326171875
    }
}

Methodology: 2026.01.18

Loiter Bosphorus/Dardanelles Approach Sep 4, 2026 20:46 UTC 75.0%
  • Duration: 6h 21m
  • Radius: 3 meters
  • Data Points: 16 AIS positions
  • Centroid: 40.7020, 29.4594
  • Zone: Bosphorus/Dardanelles Approach
Show Raw Evidence JSON
{
    "radius_m": 2.899999999999999911182158029987476766109466552734375,
    "duration_minutes": 381,
    "points": 16,
    "centroid": {
        "lat": 40.70200946874999914371073828078806400299072265625,
        "lon": 29.459398543750001664420778979547321796417236328125
    },
    "bbox": {
        "min_lat": 40.70199000000000211230144486762583255767822265625,
        "min_lon": 29.45937669999999997116901795379817485809326171875,
        "max_lat": 40.70202499999999901092451182194054126739501953125,
        "max_lon": 29.459430000000001115267878049053251743316650390625
    },
    "zone_id": "osint_bosphorus"
}

Methodology: 2026.01.18

Zone Dwell Bosphorus/Dardanelles Approach Sep 4, 2026 20:46 UTC 80.0%
  • Zone: Bosphorus/Dardanelles Approach
  • Duration: 6h 21m
  • Data Points: 16 AIS positions
  • Period: 2026-09-04T20:46:37+00:00 to 2026-09-05T03:07:37+00:00
Show Raw Evidence JSON
{
    "zone_id": "osint_bosphorus",
    "zone_name": "Bosphorus\/Dardanelles Approach",
    "dwell_minutes": 381,
    "points_in_zone": 16,
    "first_point": {
        "ts": "2026-09-04T20:46:37+00:00",
        "lat": 40.70202499999999901092451182194054126739501953125,
        "lon": 29.4593899999999990768628777004778385162353515625
    },
    "last_point": {
        "ts": "2026-09-05T03:07:37+00:00",
        "lat": 40.70199000000000211230144486762583255767822265625,
        "lon": 29.45937669999999997116901795379817485809326171875
    }
}

Methodology: 2026.01.18

Zone Dwell Bosphorus/Dardanelles Approach Sep 2, 2026 23:21 UTC 80.0%
  • Zone: Bosphorus/Dardanelles Approach
  • Duration: 1 hours
  • Data Points: 4 AIS positions
  • Period: 2026-09-02T23:21:51+00:00 to 2026-09-03T00:21:51+00:00
Show Raw Evidence JSON
{
    "zone_id": "osint_bosphorus",
    "zone_name": "Bosphorus\/Dardanelles Approach",
    "dwell_minutes": 60,
    "points_in_zone": 4,
    "first_point": {
        "ts": "2026-09-02T23:21:51+00:00",
        "lat": 40.70197170000000141953933052718639373779296875,
        "lon": 29.4593966999999992140146787278354167938232421875
    },
    "last_point": {
        "ts": "2026-09-03T00:21:51+00:00",
        "lat": 40.702006699999998318162397481501102447509765625,
        "lon": 29.45942000000000149384504766203463077545166015625
    }
}

Methodology: 2026.01.18

Zone Dwell Bosphorus/Dardanelles Approach Sep 2, 2026 22:45 UTC 80.0%
  • Zone: Bosphorus/Dardanelles Approach
  • Duration: 1h 36m
  • Data Points: 5 AIS positions
  • Period: 2026-09-02T22:45:51+00:00 to 2026-09-03T00:21:51+00:00
Show Raw Evidence JSON
{
    "zone_id": "osint_bosphorus",
    "zone_name": "Bosphorus\/Dardanelles Approach",
    "dwell_minutes": 96,
    "points_in_zone": 5,
    "first_point": {
        "ts": "2026-09-02T22:45:51+00:00",
        "lat": 40.7020150000000029422153602354228496551513671875,
        "lon": 29.4593966999999992140146787278354167938232421875
    },
    "last_point": {
        "ts": "2026-09-03T00:21:51+00:00",
        "lat": 40.702006699999998318162397481501102447509765625,
        "lon": 29.45942000000000149384504766203463077545166015625
    }
}

Methodology: 2026.01.18

Zone Dwell Bosphorus/Dardanelles Approach Sep 2, 2026 21:06 UTC 80.0%
  • Zone: Bosphorus/Dardanelles Approach
  • Duration: 3h 15m
  • Data Points: 6 AIS positions
  • Period: 2026-09-02T21:06:50+00:00 to 2026-09-03T00:21:51+00:00
Show Raw Evidence JSON
{
    "zone_id": "osint_bosphorus",
    "zone_name": "Bosphorus\/Dardanelles Approach",
    "dwell_minutes": 195,
    "points_in_zone": 6,
    "first_point": {
        "ts": "2026-09-02T21:06:50+00:00",
        "lat": 40.70201329999999728670445620082318782806396484375,
        "lon": 29.459385000000001042508301907218992710113525390625
    },
    "last_point": {
        "ts": "2026-09-03T00:21:51+00:00",
        "lat": 40.702006699999998318162397481501102447509765625,
        "lon": 29.45942000000000149384504766203463077545166015625
    }
}

Methodology: 2026.01.18

Zone Dwell Bosphorus/Dardanelles Approach Sep 2, 2026 02:03 UTC 80.0%
  • Zone: Bosphorus/Dardanelles Approach
  • Duration: 3h 9m
  • Data Points: 2 AIS positions
  • Period: 2026-09-02T02:03:50+00:00 to 2026-09-02T05:12:50+00:00
Show Raw Evidence JSON
{
    "zone_id": "osint_bosphorus",
    "zone_name": "Bosphorus\/Dardanelles Approach",
    "dwell_minutes": 189,
    "points_in_zone": 2,
    "first_point": {
        "ts": "2026-09-02T02:03:50+00:00",
        "lat": 40.702006699999998318162397481501102447509765625,
        "lon": 29.459386699999999592591848340816795825958251953125
    },
    "last_point": {
        "ts": "2026-09-02T05:12:50+00:00",
        "lat": 40.7019882999999964567905408330261707305908203125,
        "lon": 29.459411700000000422505763708613812923431396484375
    }
}

Methodology: 2026.01.18

Zone Dwell Bosphorus/Dardanelles Approach Sep 2, 2026 01:06 UTC 80.0%
  • Zone: Bosphorus/Dardanelles Approach
  • Duration: 4h 6m
  • Data Points: 5 AIS positions
  • Period: 2026-09-02T01:06:52+00:00 to 2026-09-02T05:12:50+00:00
Show Raw Evidence JSON
{
    "zone_id": "osint_bosphorus",
    "zone_name": "Bosphorus\/Dardanelles Approach",
    "dwell_minutes": 246,
    "points_in_zone": 5,
    "first_point": {
        "ts": "2026-09-02T01:06:52+00:00",
        "lat": 40.7020083000000028050635592080652713775634765625,
        "lon": 29.459406699999998835437509114854037761688232421875
    },
    "last_point": {
        "ts": "2026-09-02T05:12:50+00:00",
        "lat": 40.7019882999999964567905408330261707305908203125,
        "lon": 29.459411700000000422505763708613812923431396484375
    }
}

Methodology: 2026.01.18

Loiter Bosphorus/Dardanelles Approach Sep 2, 2026 00:27 UTC 75.0%
  • Duration: 4h 45m
  • Radius: 2 meters
  • Data Points: 10 AIS positions
  • Centroid: 40.7020, 29.4594
  • Zone: Bosphorus/Dardanelles Approach
Show Raw Evidence JSON
{
    "radius_m": 1.8000000000000000444089209850062616169452667236328125,
    "duration_minutes": 285,
    "points": 10,
    "centroid": {
        "lat": 40.7019971799999922268398222513496875762939453125,
        "lon": 29.459398339999996352389644016511738300323486328125
    },
    "bbox": {
        "min_lat": 40.7019882999999964567905408330261707305908203125,
        "min_lon": 29.459379999999999455440047313459217548370361328125,
        "max_lat": 40.7020083000000028050635592080652713775634765625,
        "max_lon": 29.459411700000000422505763708613812923431396484375
    },
    "zone_id": "osint_bosphorus"
}

Methodology: 2026.01.18

Zone Dwell Bosphorus/Dardanelles Approach Sep 2, 2026 00:27 UTC 80.0%
  • Zone: Bosphorus/Dardanelles Approach
  • Duration: 4h 45m
  • Data Points: 10 AIS positions
  • Period: 2026-09-02T00:27:51+00:00 to 2026-09-02T05:12:50+00:00
Show Raw Evidence JSON
{
    "zone_id": "osint_bosphorus",
    "zone_name": "Bosphorus\/Dardanelles Approach",
    "dwell_minutes": 285,
    "points_in_zone": 10,
    "first_point": {
        "ts": "2026-09-02T00:27:51+00:00",
        "lat": 40.70199170000000066238499130122363567352294921875,
        "lon": 29.459398300000000148202161653898656368255615234375
    },
    "last_point": {
        "ts": "2026-09-02T05:12:50+00:00",
        "lat": 40.7019882999999964567905408330261707305908203125,
        "lon": 29.459411700000000422505763708613812923431396484375
    }
}

Methodology: 2026.01.18

Loiter Bosphorus/Dardanelles Approach Sep 1, 2026 23:42 UTC 75.0%
  • Duration: 5h 30m
  • Radius: 2 meters
  • Data Points: 13 AIS positions
  • Centroid: 40.7020, 29.4594
  • Zone: Bosphorus/Dardanelles Approach
Show Raw Evidence JSON
{
    "radius_m": 1.8000000000000000444089209850062616169452667236328125,
    "duration_minutes": 330,
    "points": 13,
    "centroid": {
        "lat": 40.70199629230769033938486245460808277130126953125,
        "lon": 29.4593982076923026625081547535955905914306640625
    },
    "bbox": {
        "min_lat": 40.7019882999999964567905408330261707305908203125,
        "min_lon": 29.459379999999999455440047313459217548370361328125,
        "max_lat": 40.7020083000000028050635592080652713775634765625,
        "max_lon": 29.459411700000000422505763708613812923431396484375
    },
    "zone_id": "osint_bosphorus"
}

Methodology: 2026.01.18

Zone Dwell Bosphorus/Dardanelles Approach Sep 1, 2026 23:42 UTC 80.0%
  • Zone: Bosphorus/Dardanelles Approach
  • Duration: 5h 30m
  • Data Points: 13 AIS positions
  • Period: 2026-09-01T23:42:51+00:00 to 2026-09-02T05:12:50+00:00
Show Raw Evidence JSON
{
    "zone_id": "osint_bosphorus",
    "zone_name": "Bosphorus\/Dardanelles Approach",
    "dwell_minutes": 330,
    "points_in_zone": 13,
    "first_point": {
        "ts": "2026-09-01T23:42:51+00:00",
        "lat": 40.7020016999999967310941428877413272857666015625,
        "lon": 29.4593899999999990768628777004778385162353515625
    },
    "last_point": {
        "ts": "2026-09-02T05:12:50+00:00",
        "lat": 40.7019882999999964567905408330261707305908203125,
        "lon": 29.459411700000000422505763708613812923431396484375
    }
}

Methodology: 2026.01.18

Loiter Bosphorus/Dardanelles Approach Sep 1, 2026 21:39 UTC 75.0%
  • Duration: 4h 24m
  • Radius: 2 meters
  • Data Points: 14 AIS positions
  • Centroid: 40.7020, 29.4594
  • Zone: Bosphorus/Dardanelles Approach
Show Raw Evidence JSON
{
    "radius_m": 1.6999999999999999555910790149937383830547332763671875,
    "duration_minutes": 264,
    "points": 14,
    "centroid": {
        "lat": 40.7019972714285671600009663961827754974365234375,
        "lon": 29.459397021428568308465401059947907924652099609375
    },
    "bbox": {
        "min_lat": 40.7019882999999964567905408330261707305908203125,
        "min_lon": 29.459379999999999455440047313459217548370361328125,
        "max_lat": 40.7020083000000028050635592080652713775634765625,
        "max_lon": 29.45940829999999976962499204091727733612060546875
    },
    "zone_id": "osint_bosphorus"
}

Methodology: 2026.01.18

Zone Dwell Bosphorus/Dardanelles Approach Sep 1, 2026 21:39 UTC 80.0%
  • Zone: Bosphorus/Dardanelles Approach
  • Duration: 4h 24m
  • Data Points: 14 AIS positions
  • Period: 2026-09-01T21:39:50+00:00 to 2026-09-02T02:03:50+00:00
Show Raw Evidence JSON
{
    "zone_id": "osint_bosphorus",
    "zone_name": "Bosphorus\/Dardanelles Approach",
    "dwell_minutes": 264,
    "points_in_zone": 14,
    "first_point": {
        "ts": "2026-09-01T21:39:50+00:00",
        "lat": 40.7020049999999997680788510479032993316650390625,
        "lon": 29.459385000000001042508301907218992710113525390625
    },
    "last_point": {
        "ts": "2026-09-02T02:03:50+00:00",
        "lat": 40.702006699999998318162397481501102447509765625,
        "lon": 29.459386699999999592591848340816795825958251953125
    }
}

Methodology: 2026.01.18

Sts🛰️✗ Bosphorus/Dardanelles Approach Aug 24, 2026 02:12 UTC 75/100
Vessel A: IMO 9439345 (GULF PETROLEUM 4) Marshall Is
Vessel B: RIKER (RIKER) SIERRA LEONE
  • Minimum Distance: 187 meters
  • Average Distance: 189 meters
  • Duration: 54 minutes
  • Period: 2026-08-24T02:12:15+00:00 to 2026-08-24T03:06:15+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Bosphorus/Dardanelles Approach

Confidence Analysis

Score: 75/100

Moderate-confidence STS candidate. Two tankers (GULF PETROLEUM 4 and RIKER) maintained close proximity (min 187m, avg 189m) for 54 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 Bosphorus/Dardanelles Approach, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness20/25Min distance 187m, avg 189m
Duration10/25Duration 54 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±2m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Bosphorus/Dardanelles Approach

🛰️ Satellite Corroboration

✗ SAR Not Available

No satellite imagery for this time/location

No Sentinel-1 scenes covering AOI and time window

Searched: 2026-08-24T08:15:04.197776+00:00

Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 538011785,
        "imo": 9439345,
        "name": "GULF PETROLEUM 4",
        "flag": "Marshall Is"
    },
    "vessel_b": {
        "mmsi": 667002011,
        "imo": 9253909,
        "name": "RIKER",
        "flag": "SIERRA LEONE"
    },
    "min_distance_m": 187,
    "avg_distance_m": 189.19999999999998863131622783839702606201171875,
    "distance_consistency_m": 1.5,
    "duration_minutes": 54,
    "overlap_duration_s": 3240,
    "speed_a_avg": 0,
    "speed_a_std": 0,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0,
            "max_sog": 0
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-08-24T02:12:15+00:00",
        "end": "2026-08-24T03:06:15+00:00"
    },
    "points_count": {
        "vessel_a": 5,
        "vessel_b": 5
    },
    "zone_id": "osint_bosphorus",
    "zone_name": "Bosphorus\/Dardanelles Approach",
    "score": {
        "value": 75,
        "components": {
            "distance_tightness": {
                "score": 20,
                "max": 25,
                "detail": "Min distance 187m, avg 189m"
            },
            "duration": {
                "score": 10,
                "max": 25,
                "detail": "Duration 54 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b12m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Bosphorus\/Dardanelles Approach"
            }
        },
        "summary": "Moderate-confidence STS candidate. Two tankers (GULF PETROLEUM 4 and RIKER) maintained close proximity (min 187m, avg 189m) for 54 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 Bosphorus\/Dardanelles Approach, a known STS activity area."
    },
    "sar": {
        "status": "not_found",
        "centroid": {
            "lat": 40.70278400000000118552634376101195812225341796875,
            "lon": 29.459842900000001719718056847341358661651611328125
        },
        "time_window": {
            "start_ts": "2026-08-24T02:12:15+00:00",
            "end_ts": "2026-08-24T03:06:15+00:00"
        },
        "searched_at": "2026-08-24T08:15:04.197776+00:00",
        "notes": "No Sentinel-1 scenes covering AOI and time window"
    }
}

Methodology: 2026.01.18

Zone Dwell Bosphorus/Dardanelles Approach Aug 24, 2026 02:06 UTC 80.0%
  • Zone: Bosphorus/Dardanelles Approach
  • Duration: 1h 3m
  • Data Points: 6 AIS positions
  • Period: 2026-08-24T02:06:03+00:00 to 2026-08-24T03:09:04+00:00
Show Raw Evidence JSON
{
    "zone_id": "osint_bosphorus",
    "zone_name": "Bosphorus\/Dardanelles Approach",
    "dwell_minutes": 63,
    "points_in_zone": 6,
    "first_point": {
        "ts": "2026-08-24T02:06:03+00:00",
        "lat": 40.7020016999999967310941428877413272857666015625,
        "lon": 29.459395000000000663931132294237613677978515625
    },
    "last_point": {
        "ts": "2026-08-24T03:09:04+00:00",
        "lat": 40.7020083000000028050635592080652713775634765625,
        "lon": 29.459399999999998698285708087496459484100341796875
    }
}

Methodology: 2026.01.18

Sts Bosphorus/Dardanelles Approach Aug 24, 2026 01:12 UTC 85/100
Vessel A: RIKER (RIKER) SIERRA LEONE
Vessel B: IMO 9439345 (GULF PETROLEUM 4) Marshall Is
  • Minimum Distance: 186 meters
  • Average Distance: 189 meters
  • Duration: 1h 57m
  • Period: 2026-08-24T01:12:04+00:00 to 2026-08-24T03:09:04+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Bosphorus/Dardanelles Approach

Confidence Analysis

Score: 85/100

High-confidence STS candidate. Two tankers (RIKER and GULF PETROLEUM 4) maintained close proximity (min 186m, avg 189m) for 117 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Bosphorus/Dardanelles Approach, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness20/25Min distance 186m, avg 189m
Duration20/25Duration 117 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±2m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Bosphorus/Dardanelles Approach
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 667002011,
        "imo": 9253909,
        "name": "RIKER",
        "flag": "SIERRA LEONE"
    },
    "vessel_b": {
        "mmsi": 538011785,
        "imo": 9439345,
        "name": "GULF PETROLEUM 4",
        "flag": "Marshall Is"
    },
    "min_distance_m": 186,
    "avg_distance_m": 188.900000000000005684341886080801486968994140625,
    "distance_consistency_m": 1.600000000000000088817841970012523233890533447265625,
    "duration_minutes": 117,
    "overlap_duration_s": 7020,
    "speed_a_avg": 0,
    "speed_a_std": 0,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0,
            "max_sog": 0
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-08-24T01:12:04+00:00",
        "end": "2026-08-24T03:09:04+00:00"
    },
    "points_count": {
        "vessel_a": 9,
        "vessel_b": 9
    },
    "zone_id": "osint_bosphorus",
    "zone_name": "Bosphorus\/Dardanelles Approach",
    "score": {
        "value": 85,
        "components": {
            "distance_tightness": {
                "score": 20,
                "max": 25,
                "detail": "Min distance 186m, avg 189m"
            },
            "duration": {
                "score": 20,
                "max": 25,
                "detail": "Duration 117 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b12m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Bosphorus\/Dardanelles Approach"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (RIKER and GULF PETROLEUM 4) maintained close proximity (min 186m, avg 189m) for 117 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Bosphorus\/Dardanelles Approach, a known STS activity area."
    }
}

Methodology: 2026.01.18

Loiter Bosphorus/Dardanelles Approach Aug 24, 2026 01:09 UTC 75.0%
  • Duration: 2 hours
  • Radius: 3 meters
  • Data Points: 10 AIS positions
  • Centroid: 40.7020, 29.4594
  • Zone: Bosphorus/Dardanelles Approach
Show Raw Evidence JSON
{
    "radius_m": 2.899999999999999911182158029987476766109466552734375,
    "duration_minutes": 120,
    "points": 10,
    "centroid": {
        "lat": 40.7019988299999937453321763314306735992431640625,
        "lon": 29.459398680000003167833710904233157634735107421875
    },
    "bbox": {
        "min_lat": 40.7019767000000030066075851209461688995361328125,
        "min_lon": 29.459386699999999592591848340816795825958251953125,
        "max_lat": 40.70202499999999901092451182194054126739501953125,
        "max_lon": 29.45940829999999976962499204091727733612060546875
    },
    "zone_id": "osint_bosphorus"
}

Methodology: 2026.01.18

Zone Dwell Bosphorus/Dardanelles Approach Aug 24, 2026 01:09 UTC 80.0%
  • Zone: Bosphorus/Dardanelles Approach
  • Duration: 2 hours
  • Data Points: 10 AIS positions
  • Period: 2026-08-24T01:09:03+00:00 to 2026-08-24T03:09:04+00:00
Show Raw Evidence JSON
{
    "zone_id": "osint_bosphorus",
    "zone_name": "Bosphorus\/Dardanelles Approach",
    "dwell_minutes": 120,
    "points_in_zone": 10,
    "first_point": {
        "ts": "2026-08-24T01:09:03+00:00",
        "lat": 40.7019882999999964567905408330261707305908203125,
        "lon": 29.459391700000001179660102934576570987701416015625
    },
    "last_point": {
        "ts": "2026-08-24T03:09:04+00:00",
        "lat": 40.7020083000000028050635592080652713775634765625,
        "lon": 29.459399999999998698285708087496459484100341796875
    }
}

Methodology: 2026.01.18

Sts🛰️✗ Bosphorus/Dardanelles Approach Aug 24, 2026 01:03 UTC 55/100
Vessel A: IMO 9016454 (KAROL WOJTYLA) TANZANIA
Vessel B: RIKER (RIKER) SIERRA LEONE
  • Minimum Distance: 476 meters
  • Average Distance: 478 meters
  • Duration: 30 minutes
  • Period: 2026-08-24T01:03:35+00:00 to 2026-08-24T01:34:14+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Bosphorus/Dardanelles Approach

Confidence Analysis

Score: 55/100

Low-confidence STS candidate – may warrant review. Two tankers (KAROL WOJTYLA and RIKER) maintained close proximity (min 476m, avg 478m) for 31 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 Bosphorus/Dardanelles Approach, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness5/25Min distance 476m, avg 478m
Duration5/25Duration 31 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±1m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Bosphorus/Dardanelles Approach

🛰️ Satellite Corroboration

✗ SAR Not Available

No satellite imagery for this time/location

No Sentinel-1 scenes covering AOI and time window

Searched: 2026-08-24T03:15:04.632017+00:00

Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 677045600,
        "imo": 9016454,
        "name": "KAROL WOJTYLA",
        "flag": "TANZANIA"
    },
    "vessel_b": {
        "mmsi": 667002011,
        "imo": 9253909,
        "name": "RIKER",
        "flag": "SIERRA LEONE"
    },
    "min_distance_m": 476,
    "avg_distance_m": 477.5,
    "distance_consistency_m": 0.6999999999999999555910790149937383830547332763671875,
    "duration_minutes": 30.60000000000000142108547152020037174224853515625,
    "overlap_duration_s": 1839,
    "speed_a_avg": 0,
    "speed_a_std": 0,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0,
            "max_sog": 0
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-08-24T01:03:35+00:00",
        "end": "2026-08-24T01:34:14+00:00"
    },
    "points_count": {
        "vessel_a": 7,
        "vessel_b": 7
    },
    "zone_id": "osint_bosphorus",
    "zone_name": "Bosphorus\/Dardanelles Approach",
    "score": {
        "value": 55,
        "components": {
            "distance_tightness": {
                "score": 5,
                "max": 25,
                "detail": "Min distance 476m, avg 478m"
            },
            "duration": {
                "score": 5,
                "max": 25,
                "detail": "Duration 31 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b11m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Bosphorus\/Dardanelles Approach"
            }
        },
        "summary": "Low-confidence STS candidate - may warrant review. Two tankers (KAROL WOJTYLA and RIKER) maintained close proximity (min 476m, avg 478m) for 31 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 Bosphorus\/Dardanelles Approach, a known STS activity area."
    },
    "sar": {
        "status": "not_found",
        "centroid": {
            "lat": 40.701784500000002253727870993316173553466796875,
            "lon": 29.462206900000001752459866111166775226593017578125
        },
        "time_window": {
            "start_ts": "2026-08-24T01:03:35+00:00",
            "end_ts": "2026-08-24T01:34:14+00:00"
        },
        "searched_at": "2026-08-24T03:15:04.632017+00:00",
        "notes": "No Sentinel-1 scenes covering AOI and time window"
    }
}

Methodology: 2026.01.18

Loiter Bosphorus/Dardanelles Approach Aug 24, 2026 00:18 UTC 75.0%
  • Duration: 2h 51m
  • Radius: 3 meters
  • Data Points: 13 AIS positions
  • Centroid: 40.7020, 29.4594
  • Zone: Bosphorus/Dardanelles Approach
Show Raw Evidence JSON
{
    "radius_m": 2.899999999999999911182158029987476766109466552734375,
    "duration_minutes": 171,
    "points": 13,
    "centroid": {
        "lat": 40.70199961538461508325781323947012424468994140625,
        "lon": 29.459397961538460464225863688625395298004150390625
    },
    "bbox": {
        "min_lat": 40.7019767000000030066075851209461688995361328125,
        "min_lon": 29.4593832999999989397110766731202602386474609375,
        "max_lat": 40.70202499999999901092451182194054126739501953125,
        "max_lon": 29.45940829999999976962499204091727733612060546875
    },
    "zone_id": "osint_bosphorus"
}

Methodology: 2026.01.18

Zone Dwell Bosphorus/Dardanelles Approach Aug 24, 2026 00:18 UTC 80.0%
  • Zone: Bosphorus/Dardanelles Approach
  • Duration: 2h 51m
  • Data Points: 13 AIS positions
  • Period: 2026-08-24T00:18:04+00:00 to 2026-08-24T03:09:04+00:00
Show Raw Evidence JSON
{
    "zone_id": "osint_bosphorus",
    "zone_name": "Bosphorus\/Dardanelles Approach",
    "dwell_minutes": 171,
    "points_in_zone": 13,
    "first_point": {
        "ts": "2026-08-24T00:18:04+00:00",
        "lat": 40.7020016999999967310941428877413272857666015625,
        "lon": 29.4593966999999992140146787278354167938232421875
    },
    "last_point": {
        "ts": "2026-08-24T03:09:04+00:00",
        "lat": 40.7020083000000028050635592080652713775634765625,
        "lon": 29.459399999999998698285708087496459484100341796875
    }
}

Methodology: 2026.01.18

Sts Bosphorus/Dardanelles Approach Aug 24, 2026 00:18 UTC 65/100
Vessel A: RIKER (RIKER) SIERRA LEONE
Vessel B: IMO 9016454 (KAROL WOJTYLA) TANZANIA
  • Minimum Distance: 473 meters
  • Average Distance: 477 meters
  • Duration: 1h 9m
  • Period: 2026-08-24T00:18:04+00:00 to 2026-08-24T01:27:03+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Bosphorus/Dardanelles Approach

Confidence Analysis

Score: 65/100

Moderate-confidence STS candidate. Two tankers (RIKER and KAROL WOJTYLA) maintained close proximity (min 473m, avg 477m) for 69 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 Bosphorus/Dardanelles Approach, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness5/25Min distance 473m, avg 477m
Duration15/25Duration 69 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±2m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Bosphorus/Dardanelles Approach
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 667002011,
        "imo": 9253909,
        "name": "RIKER",
        "flag": "SIERRA LEONE"
    },
    "vessel_b": {
        "mmsi": 677045600,
        "imo": 9016454,
        "name": "KAROL WOJTYLA",
        "flag": "TANZANIA"
    },
    "min_distance_m": 473.1000000000000227373675443232059478759765625,
    "avg_distance_m": 476.80000000000001136868377216160297393798828125,
    "distance_consistency_m": 2,
    "duration_minutes": 69,
    "overlap_duration_s": 4139,
    "speed_a_avg": 0,
    "speed_a_std": 0,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0,
            "max_sog": 0
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-08-24T00:18:04+00:00",
        "end": "2026-08-24T01:27:03+00:00"
    },
    "points_count": {
        "vessel_a": 7,
        "vessel_b": 7
    },
    "zone_id": "osint_bosphorus",
    "zone_name": "Bosphorus\/Dardanelles Approach",
    "score": {
        "value": 65,
        "components": {
            "distance_tightness": {
                "score": 5,
                "max": 25,
                "detail": "Min distance 473m, avg 477m"
            },
            "duration": {
                "score": 15,
                "max": 25,
                "detail": "Duration 69 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b12m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Bosphorus\/Dardanelles Approach"
            }
        },
        "summary": "Moderate-confidence STS candidate. Two tankers (RIKER and KAROL WOJTYLA) maintained close proximity (min 473m, avg 477m) for 69 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 Bosphorus\/Dardanelles Approach, a known STS activity area."
    }
}

Methodology: 2026.01.18

Sts🛰️✗ Bosphorus/Dardanelles Approach Aug 24, 2026 00:09 UTC 80/100
Vessel A: IMO 9439345 (GULF PETROLEUM 4) Marshall Is
Vessel B: RIKER (RIKER) SIERRA LEONE
  • Minimum Distance: 187 meters
  • Average Distance: 189 meters
  • Duration: 1h 27m
  • Period: 2026-08-24T00:09:13+00:00 to 2026-08-24T01:36:14+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Bosphorus/Dardanelles Approach

Confidence Analysis

Score: 80/100

High-confidence STS candidate. Two tankers (GULF PETROLEUM 4 and RIKER) maintained close proximity (min 187m, avg 189m) for 87 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 Bosphorus/Dardanelles Approach, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness20/25Min distance 187m, avg 189m
Duration15/25Duration 87 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±2m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Bosphorus/Dardanelles Approach

🛰️ Satellite Corroboration

✗ SAR Not Available

No satellite imagery for this time/location

No Sentinel-1 scenes covering AOI and time window

Searched: 2026-08-24T03:15:09.807613+00:00

Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 538011785,
        "imo": 9439345,
        "name": "GULF PETROLEUM 4",
        "flag": "Marshall Is"
    },
    "vessel_b": {
        "mmsi": 667002011,
        "imo": 9253909,
        "name": "RIKER",
        "flag": "SIERRA LEONE"
    },
    "min_distance_m": 186.900000000000005684341886080801486968994140625,
    "avg_distance_m": 189.400000000000005684341886080801486968994140625,
    "distance_consistency_m": 1.8000000000000000444089209850062616169452667236328125,
    "duration_minutes": 87,
    "overlap_duration_s": 5221,
    "speed_a_avg": 0,
    "speed_a_std": 0,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0,
            "max_sog": 0
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-08-24T00:09:13+00:00",
        "end": "2026-08-24T01:36:14+00:00"
    },
    "points_count": {
        "vessel_a": 5,
        "vessel_b": 5
    },
    "zone_id": "osint_bosphorus",
    "zone_name": "Bosphorus\/Dardanelles Approach",
    "score": {
        "value": 80,
        "components": {
            "distance_tightness": {
                "score": 20,
                "max": 25,
                "detail": "Min distance 187m, avg 189m"
            },
            "duration": {
                "score": 15,
                "max": 25,
                "detail": "Duration 87 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b12m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Bosphorus\/Dardanelles Approach"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (GULF PETROLEUM 4 and RIKER) maintained close proximity (min 187m, avg 189m) for 87 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 Bosphorus\/Dardanelles Approach, a known STS activity area."
    },
    "sar": {
        "status": "not_found",
        "centroid": {
            "lat": 40.702768399999996518090483732521533966064453125,
            "lon": 29.45984179999999952315192786045372486114501953125
        },
        "time_window": {
            "start_ts": "2026-08-24T00:09:13+00:00",
            "end_ts": "2026-08-24T01:36:14+00:00"
        },
        "searched_at": "2026-08-24T03:15:09.807613+00:00",
        "notes": "No Sentinel-1 scenes covering AOI and time window"
    }
}

Methodology: 2026.01.18

Loiter Bosphorus/Dardanelles Approach Aug 23, 2026 23:06 UTC 75.0%
  • Duration: 4h 3m
  • Radius: 3 meters
  • Data Points: 15 AIS positions
  • Centroid: 40.7020, 29.4594
  • Zone: Bosphorus/Dardanelles Approach
Show Raw Evidence JSON
{
    "radius_m": 2.899999999999999911182158029987476766109466552734375,
    "duration_minutes": 243,
    "points": 15,
    "centroid": {
        "lat": 40.7019994399999944789669825695455074310302734375,
        "lon": 29.45939800666666741335575352422893047332763671875
    },
    "bbox": {
        "min_lat": 40.7019767000000030066075851209461688995361328125,
        "min_lon": 29.4593832999999989397110766731202602386474609375,
        "max_lat": 40.70202499999999901092451182194054126739501953125,
        "max_lon": 29.45940829999999976962499204091727733612060546875
    },
    "zone_id": "osint_bosphorus"
}

Methodology: 2026.01.18

Zone Dwell Bosphorus/Dardanelles Approach Aug 23, 2026 23:06 UTC 80.0%
  • Zone: Bosphorus/Dardanelles Approach
  • Duration: 4h 3m
  • Data Points: 15 AIS positions
  • Period: 2026-08-23T23:06:04+00:00 to 2026-08-24T03:09:04+00:00
Show Raw Evidence JSON
{
    "zone_id": "osint_bosphorus",
    "zone_name": "Bosphorus\/Dardanelles Approach",
    "dwell_minutes": 243,
    "points_in_zone": 15,
    "first_point": {
        "ts": "2026-08-23T23:06:04+00:00",
        "lat": 40.7020083000000028050635592080652713775634765625,
        "lon": 29.459398300000000148202161653898656368255615234375
    },
    "last_point": {
        "ts": "2026-08-24T03:09:04+00:00",
        "lat": 40.7020083000000028050635592080652713775634765625,
        "lon": 29.459399999999998698285708087496459484100341796875
    }
}

Methodology: 2026.01.18

Loiter Bosphorus/Dardanelles Approach Aug 23, 2026 22:15 UTC 75.0%
  • Duration: 4h 54m
  • Radius: 3 meters
  • Data Points: 19 AIS positions
  • Centroid: 40.7020, 29.4594
  • Zone: Bosphorus/Dardanelles Approach
Show Raw Evidence JSON
{
    "radius_m": 2.79999999999999982236431605997495353221893310546875,
    "duration_minutes": 294,
    "points": 19,
    "centroid": {
        "lat": 40.7020013105263132047184626571834087371826171875,
        "lon": 29.4593993947368488761640037409961223602294921875
    },
    "bbox": {
        "min_lat": 40.7019767000000030066075851209461688995361328125,
        "min_lon": 29.45938170000000155823727254755795001983642578125,
        "max_lat": 40.70202499999999901092451182194054126739501953125,
        "max_lon": 29.459418299999999391047822427935898303985595703125
    },
    "zone_id": "osint_bosphorus"
}

Methodology: 2026.01.18

Zone Dwell Bosphorus/Dardanelles Approach Aug 23, 2026 22:15 UTC 80.0%
  • Zone: Bosphorus/Dardanelles Approach
  • Duration: 4h 54m
  • Data Points: 19 AIS positions
  • Period: 2026-08-23T22:15:05+00:00 to 2026-08-24T03:09:04+00:00
Show Raw Evidence JSON
{
    "zone_id": "osint_bosphorus",
    "zone_name": "Bosphorus\/Dardanelles Approach",
    "dwell_minutes": 294,
    "points_in_zone": 19,
    "first_point": {
        "ts": "2026-08-23T22:15:05+00:00",
        "lat": 40.7019882999999964567905408330261707305908203125,
        "lon": 29.459406699999998835437509114854037761688232421875
    },
    "last_point": {
        "ts": "2026-08-24T03:09:04+00:00",
        "lat": 40.7020083000000028050635592080652713775634765625,
        "lon": 29.459399999999998698285708087496459484100341796875
    }
}

Methodology: 2026.01.18

Sts🛰️✗ Bosphorus/Dardanelles Approach Aug 23, 2026 22:15 UTC 60/100
Vessel A: RIKER (RIKER) SIERRA LEONE
Vessel B: IMO 9016454 (KAROL WOJTYLA) TANZANIA
  • Minimum Distance: 477 meters
  • Average Distance: 477 meters
  • Duration: 51 minutes
  • Period: 2026-08-23T22:15:05+00:00 to 2026-08-23T23:06:04+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Bosphorus/Dardanelles Approach

Confidence Analysis

Score: 60/100

Moderate-confidence STS candidate. Two tankers (RIKER and KAROL WOJTYLA) maintained close proximity (min 476m, avg 477m) for 51 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 Bosphorus/Dardanelles Approach, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness5/25Min distance 476m, avg 477m
Duration10/25Duration 51 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±1m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Bosphorus/Dardanelles Approach

🛰️ Satellite Corroboration

✗ SAR Not Available

No satellite imagery for this time/location

No Sentinel-1 scenes covering AOI and time window

Searched: 2026-08-24T04:45:01.422282+00:00

Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 667002011,
        "imo": 9253909,
        "name": "RIKER",
        "flag": "SIERRA LEONE"
    },
    "vessel_b": {
        "mmsi": 677045600,
        "imo": 9016454,
        "name": "KAROL WOJTYLA",
        "flag": "TANZANIA"
    },
    "min_distance_m": 476.5,
    "avg_distance_m": 477.30000000000001136868377216160297393798828125,
    "distance_consistency_m": 1.3000000000000000444089209850062616169452667236328125,
    "duration_minutes": 51,
    "overlap_duration_s": 3059,
    "speed_a_avg": 0,
    "speed_a_std": 0,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0,
            "max_sog": 0
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-08-23T22:15:05+00:00",
        "end": "2026-08-23T23:06:04+00:00"
    },
    "points_count": {
        "vessel_a": 5,
        "vessel_b": 5
    },
    "zone_id": "osint_bosphorus",
    "zone_name": "Bosphorus\/Dardanelles Approach",
    "score": {
        "value": 60,
        "components": {
            "distance_tightness": {
                "score": 5,
                "max": 25,
                "detail": "Min distance 476m, avg 477m"
            },
            "duration": {
                "score": 10,
                "max": 25,
                "detail": "Duration 51 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b11m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Bosphorus\/Dardanelles Approach"
            }
        },
        "summary": "Moderate-confidence STS candidate. Two tankers (RIKER and KAROL WOJTYLA) maintained close proximity (min 476m, avg 477m) for 51 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 Bosphorus\/Dardanelles Approach, a known STS activity area."
    },
    "sar": {
        "status": "not_found",
        "centroid": {
            "lat": 40.701785499999999728970578871667385101318359375,
            "lon": 29.46221200000000095542418421246111392974853515625
        },
        "time_window": {
            "start_ts": "2026-08-23T22:15:05+00:00",
            "end_ts": "2026-08-23T23:06:04+00:00"
        },
        "searched_at": "2026-08-24T04:45:01.422282+00:00",
        "notes": "No Sentinel-1 scenes covering AOI and time window"
    }
}

Methodology: 2026.01.18

Sts Bosphorus/Dardanelles Approach Aug 23, 2026 21:54 UTC 65/100
Vessel A: RIKER (RIKER) SIERRA LEONE
Vessel B: IMO 9016454 (KAROL WOJTYLA) TANZANIA
  • Minimum Distance: 477 meters
  • Average Distance: 478 meters
  • Duration: 1h 12m
  • Period: 2026-08-23T21:54:03+00:00 to 2026-08-23T23:06:04+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Bosphorus/Dardanelles Approach

Confidence Analysis

Score: 65/100

Moderate-confidence STS candidate. Two tankers (RIKER and KAROL WOJTYLA) maintained close proximity (min 476m, avg 478m) for 72 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 Bosphorus/Dardanelles Approach, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness5/25Min distance 476m, avg 478m
Duration15/25Duration 72 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±1m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Bosphorus/Dardanelles Approach
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 667002011,
        "imo": 9253909,
        "name": "RIKER",
        "flag": "SIERRA LEONE"
    },
    "vessel_b": {
        "mmsi": 677045600,
        "imo": 9016454,
        "name": "KAROL WOJTYLA",
        "flag": "TANZANIA"
    },
    "min_distance_m": 476.5,
    "avg_distance_m": 477.5,
    "distance_consistency_m": 1.3000000000000000444089209850062616169452667236328125,
    "duration_minutes": 72,
    "overlap_duration_s": 4321,
    "speed_a_avg": 0,
    "speed_a_std": 0,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0,
            "max_sog": 0
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-08-23T21:54:03+00:00",
        "end": "2026-08-23T23:06:04+00:00"
    },
    "points_count": {
        "vessel_a": 6,
        "vessel_b": 6
    },
    "zone_id": "osint_bosphorus",
    "zone_name": "Bosphorus\/Dardanelles Approach",
    "score": {
        "value": 65,
        "components": {
            "distance_tightness": {
                "score": 5,
                "max": 25,
                "detail": "Min distance 476m, avg 478m"
            },
            "duration": {
                "score": 15,
                "max": 25,
                "detail": "Duration 72 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b11m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Bosphorus\/Dardanelles Approach"
            }
        },
        "summary": "Moderate-confidence STS candidate. Two tankers (RIKER and KAROL WOJTYLA) maintained close proximity (min 476m, avg 478m) for 72 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 Bosphorus\/Dardanelles Approach, a known STS activity area."
    }
}

Methodology: 2026.01.18

Loiter Bosphorus/Dardanelles Approach Aug 23, 2026 21:21 UTC 75.0%
  • Duration: 5h 48m
  • Radius: 3 meters
  • Data Points: 23 AIS positions
  • Centroid: 40.7020, 29.4594
  • Zone: Bosphorus/Dardanelles Approach
Show Raw Evidence JSON
{
    "radius_m": 2.70000000000000017763568394002504646778106689453125,
    "duration_minutes": 348,
    "points": 23,
    "centroid": {
        "lat": 40.70200086521739279987741610966622829437255859375,
        "lon": 29.4593982695652130132657475769519805908203125
    },
    "bbox": {
        "min_lat": 40.7019767000000030066075851209461688995361328125,
        "min_lon": 29.45937669999999997116901795379817485809326171875,
        "max_lat": 40.70202499999999901092451182194054126739501953125,
        "max_lon": 29.459424999999999528199623455293476581573486328125
    },
    "zone_id": "osint_bosphorus"
}

Methodology: 2026.01.18

Zone Dwell Bosphorus/Dardanelles Approach Aug 23, 2026 21:21 UTC 80.0%
  • Zone: Bosphorus/Dardanelles Approach
  • Duration: 5h 48m
  • Data Points: 23 AIS positions
  • Period: 2026-08-23T21:21:03+00:00 to 2026-08-24T03:09:04+00:00
Show Raw Evidence JSON
{
    "zone_id": "osint_bosphorus",
    "zone_name": "Bosphorus\/Dardanelles Approach",
    "dwell_minutes": 348,
    "points_in_zone": 23,
    "first_point": {
        "ts": "2026-08-23T21:21:03+00:00",
        "lat": 40.702006699999998318162397481501102447509765625,
        "lon": 29.45937669999999997116901795379817485809326171875
    },
    "last_point": {
        "ts": "2026-08-24T03:09:04+00:00",
        "lat": 40.7020083000000028050635592080652713775634765625,
        "lon": 29.459399999999998698285708087496459484100341796875
    }
}

Methodology: 2026.01.18

Sts🛰️✗ Bosphorus/Dardanelles Approach Aug 23, 2026 21:18 UTC 85/100
Vessel A: IMO 9439345 (GULF PETROLEUM 4) Marshall Is
Vessel B: RIKER (RIKER) SIERRA LEONE
  • Minimum Distance: 185 meters
  • Average Distance: 187 meters
  • Duration: 1h 48m
  • Period: 2026-08-23T21:18:12+00:00 to 2026-08-23T23:06:14+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Bosphorus/Dardanelles Approach

Confidence Analysis

Score: 85/100

High-confidence STS candidate. Two tankers (GULF PETROLEUM 4 and RIKER) maintained close proximity (min 185m, avg 187m) for 108 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Bosphorus/Dardanelles Approach, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness20/25Min distance 185m, avg 187m
Duration20/25Duration 108 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±2m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Bosphorus/Dardanelles Approach

🛰️ Satellite Corroboration

✗ SAR Not Available

No satellite imagery for this time/location

No Sentinel-1 scenes covering AOI and time window

Searched: 2026-08-24T03:15:07.360715+00:00

Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 538011785,
        "imo": 9439345,
        "name": "GULF PETROLEUM 4",
        "flag": "Marshall Is"
    },
    "vessel_b": {
        "mmsi": 667002011,
        "imo": 9253909,
        "name": "RIKER",
        "flag": "SIERRA LEONE"
    },
    "min_distance_m": 184.69999999999998863131622783839702606201171875,
    "avg_distance_m": 186.69999999999998863131622783839702606201171875,
    "distance_consistency_m": 2,
    "duration_minutes": 108,
    "overlap_duration_s": 6482,
    "speed_a_avg": 0,
    "speed_a_std": 0,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0,
            "max_sog": 0
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-08-23T21:18:12+00:00",
        "end": "2026-08-23T23:06:14+00:00"
    },
    "points_count": {
        "vessel_a": 7,
        "vessel_b": 7
    },
    "zone_id": "osint_bosphorus",
    "zone_name": "Bosphorus\/Dardanelles Approach",
    "score": {
        "value": 85,
        "components": {
            "distance_tightness": {
                "score": 20,
                "max": 25,
                "detail": "Min distance 185m, avg 187m"
            },
            "duration": {
                "score": 20,
                "max": 25,
                "detail": "Duration 108 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b12m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Bosphorus\/Dardanelles Approach"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (GULF PETROLEUM 4 and RIKER) maintained close proximity (min 185m, avg 187m) for 108 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Bosphorus\/Dardanelles Approach, a known STS activity area."
    },
    "sar": {
        "status": "not_found",
        "centroid": {
            "lat": 40.70277569999999656147338100709021091461181640625,
            "lon": 29.459842200000000644877218292094767093658447265625
        },
        "time_window": {
            "start_ts": "2026-08-23T21:18:12+00:00",
            "end_ts": "2026-08-23T23:06:14+00:00"
        },
        "searched_at": "2026-08-24T03:15:07.360715+00:00",
        "notes": "No Sentinel-1 scenes covering AOI and time window"
    }
}

Methodology: 2026.01.18

Sts Bosphorus/Dardanelles Approach Aug 23, 2026 20:51 UTC 80/100
Vessel A: RIKER (RIKER) SIERRA LEONE
Vessel B: IMO 9439345 (GULF PETROLEUM 4) Marshall Is
  • Minimum Distance: 186 meters
  • Average Distance: 188 meters
  • Duration: 1h 3m
  • Period: 2026-08-23T20:51:03+00:00 to 2026-08-23T21:54:03+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Bosphorus/Dardanelles Approach

Confidence Analysis

Score: 80/100

High-confidence STS candidate. Two tankers (RIKER and GULF PETROLEUM 4) maintained close proximity (min 186m, avg 188m) for 63 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 Bosphorus/Dardanelles Approach, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness20/25Min distance 186m, avg 188m
Duration15/25Duration 63 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±1m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Bosphorus/Dardanelles Approach
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 667002011,
        "imo": 9253909,
        "name": "RIKER",
        "flag": "SIERRA LEONE"
    },
    "vessel_b": {
        "mmsi": 538011785,
        "imo": 9439345,
        "name": "GULF PETROLEUM 4",
        "flag": "Marshall Is"
    },
    "min_distance_m": 185.80000000000001136868377216160297393798828125,
    "avg_distance_m": 187.900000000000005684341886080801486968994140625,
    "distance_consistency_m": 1.3000000000000000444089209850062616169452667236328125,
    "duration_minutes": 63,
    "overlap_duration_s": 3780,
    "speed_a_avg": 0,
    "speed_a_std": 0,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0,
            "max_sog": 0
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-08-23T20:51:03+00:00",
        "end": "2026-08-23T21:54:03+00:00"
    },
    "points_count": {
        "vessel_a": 7,
        "vessel_b": 7
    },
    "zone_id": "osint_bosphorus",
    "zone_name": "Bosphorus\/Dardanelles Approach",
    "score": {
        "value": 80,
        "components": {
            "distance_tightness": {
                "score": 20,
                "max": 25,
                "detail": "Min distance 186m, avg 188m"
            },
            "duration": {
                "score": 15,
                "max": 25,
                "detail": "Duration 63 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b11m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Bosphorus\/Dardanelles Approach"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (RIKER and GULF PETROLEUM 4) maintained close proximity (min 186m, avg 188m) for 63 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 Bosphorus\/Dardanelles Approach, a known STS activity area."
    }
}

Methodology: 2026.01.18

Loiter Bosphorus/Dardanelles Approach Aug 23, 2026 20:15 UTC 75.0%
  • Duration: 6h 18m
  • Radius: 3 meters
  • Data Points: 26 AIS positions
  • Centroid: 40.7020, 29.4594
  • Zone: Bosphorus/Dardanelles Approach
Show Raw Evidence JSON
{
    "radius_m": 2.899999999999999911182158029987476766109466552734375,
    "duration_minutes": 378,
    "points": 26,
    "centroid": {
        "lat": 40.70200249615384535673001664690673351287841796875,
        "lon": 29.45939821153844917489550425671041011810302734375
    },
    "bbox": {
        "min_lat": 40.7019767000000030066075851209461688995361328125,
        "min_lon": 29.45937669999999997116901795379817485809326171875,
        "max_lat": 40.70202499999999901092451182194054126739501953125,
        "max_lon": 29.459424999999999528199623455293476581573486328125
    },
    "zone_id": "osint_bosphorus"
}

Methodology: 2026.01.18

Zone Dwell Bosphorus/Dardanelles Approach Aug 23, 2026 20:15 UTC 80.0%
  • Zone: Bosphorus/Dardanelles Approach
  • Duration: 6h 18m
  • Data Points: 26 AIS positions
  • Period: 2026-08-23T20:51:03+00:00 to 2026-08-24T03:09:04+00:00
Show Raw Evidence JSON
{
    "zone_id": "osint_bosphorus",
    "zone_name": "Bosphorus\/Dardanelles Approach",
    "dwell_minutes": 378,
    "points_in_zone": 26,
    "first_point": {
        "ts": "2026-08-23T20:51:03+00:00",
        "lat": 40.7020016999999967310941428877413272857666015625,
        "lon": 29.4593899999999990768628777004778385162353515625
    },
    "last_point": {
        "ts": "2026-08-24T03:09:04+00:00",
        "lat": 40.7020083000000028050635592080652713775634765625,
        "lon": 29.459399999999998698285708087496459484100341796875
    }
}

Methodology: 2026.01.18

Zone Dwell Bosphorus/Dardanelles Approach Aug 22, 2026 21:03 UTC 80.0%
  • Zone: Bosphorus/Dardanelles Approach
  • Duration: 2h 9m
  • Data Points: 6 AIS positions
  • Period: 2026-08-22T21:03:04+00:00 to 2026-08-22T23:12:03+00:00
Show Raw Evidence JSON
{
    "zone_id": "osint_bosphorus",
    "zone_name": "Bosphorus\/Dardanelles Approach",
    "dwell_minutes": 129,
    "points_in_zone": 6,
    "first_point": {
        "ts": "2026-08-22T21:03:04+00:00",
        "lat": 40.70201329999999728670445620082318782806396484375,
        "lon": 29.459395000000000663931132294237613677978515625
    },
    "last_point": {
        "ts": "2026-08-22T23:12:03+00:00",
        "lat": 40.7020116999999999052306520752608776092529296875,
        "lon": 29.45942670000000163099684868939220905303955078125
    }
}

Methodology: 2026.01.18

Sts🛰️✗ Bosphorus/Dardanelles Approach Aug 22, 2026 19:35 UTC 90/100
Vessel A: IMO 9439345 (GULF PETROLEUM 4) Marshall Is
Vessel B: RIKER (RIKER) SIERRA LEONE
  • Minimum Distance: 183 meters
  • Average Distance: 184 meters
  • Duration: 3h 18m
  • Period: 2026-08-22T19:35:57+00:00 to 2026-08-22T22:53:58+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Bosphorus/Dardanelles Approach

Confidence Analysis

Score: 90/100

High-confidence STS candidate. Two tankers (GULF PETROLEUM 4 and RIKER) maintained close proximity (min 183m, avg 184m) for 198 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 Bosphorus/Dardanelles Approach, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness20/25Min distance 183m, avg 184m
Duration25/25Duration 198 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±1m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Bosphorus/Dardanelles Approach

🛰️ Satellite Corroboration

✗ SAR Not Available

No satellite imagery for this time/location

No Sentinel-1 scenes covering AOI and time window

Searched: 2026-08-23T01:30:03.847203+00:00

Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 538011785,
        "imo": 9439345,
        "name": "GULF PETROLEUM 4",
        "flag": "Marshall Is"
    },
    "vessel_b": {
        "mmsi": 667002011,
        "imo": 9253909,
        "name": "RIKER",
        "flag": "SIERRA LEONE"
    },
    "min_distance_m": 183.30000000000001136868377216160297393798828125,
    "avg_distance_m": 184.19999999999998863131622783839702606201171875,
    "distance_consistency_m": 1.1999999999999999555910790149937383830547332763671875,
    "duration_minutes": 198,
    "overlap_duration_s": 11881,
    "speed_a_avg": 0,
    "speed_a_std": 0,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0,
            "max_sog": 0
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-08-22T19:35:57+00:00",
        "end": "2026-08-22T22:53:58+00:00"
    },
    "points_count": {
        "vessel_a": 2,
        "vessel_b": 2
    },
    "zone_id": "osint_bosphorus",
    "zone_name": "Bosphorus\/Dardanelles Approach",
    "score": {
        "value": 90,
        "components": {
            "distance_tightness": {
                "score": 20,
                "max": 25,
                "detail": "Min distance 183m, avg 184m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 198 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b11m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Bosphorus\/Dardanelles Approach"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (GULF PETROLEUM 4 and RIKER) maintained close proximity (min 183m, avg 184m) for 198 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 Bosphorus\/Dardanelles Approach, a known STS activity area."
    },
    "sar": {
        "status": "not_found",
        "centroid": {
            "lat": 40.70278090000000048576112021692097187042236328125,
            "lon": 29.45984539999999896053850534372031688690185546875
        },
        "time_window": {
            "start_ts": "2026-08-22T19:35:57+00:00",
            "end_ts": "2026-08-22T22:53:58+00:00"
        },
        "searched_at": "2026-08-23T01:30:03.847203+00:00",
        "notes": "No Sentinel-1 scenes covering AOI and time window"
    }
}

Methodology: 2026.01.18

Zone Dwell Bosphorus/Dardanelles Approach Aug 22, 2026 19:15 UTC 80.0%
  • Zone: Bosphorus/Dardanelles Approach
  • Duration: 3h 57m
  • Data Points: 8 AIS positions
  • Period: 2026-08-22T19:15:05+00:00 to 2026-08-22T23:12:03+00:00
Show Raw Evidence JSON
{
    "zone_id": "osint_bosphorus",
    "zone_name": "Bosphorus\/Dardanelles Approach",
    "dwell_minutes": 237,
    "points_in_zone": 8,
    "first_point": {
        "ts": "2026-08-22T19:15:05+00:00",
        "lat": 40.7020150000000029422153602354228496551513671875,
        "lon": 29.459398300000000148202161653898656368255615234375
    },
    "last_point": {
        "ts": "2026-08-22T23:12:03+00:00",
        "lat": 40.7020116999999999052306520752608776092529296875,
        "lon": 29.45942670000000163099684868939220905303955078125
    }
}

Methodology: 2026.01.18

Zone Dwell Bosphorus/Dardanelles Approach Aug 22, 2026 18:33 UTC 80.0%
  • Zone: Bosphorus/Dardanelles Approach
  • Duration: 4h 39m
  • Data Points: 9 AIS positions
  • Period: 2026-08-22T18:33:04+00:00 to 2026-08-22T23:12:03+00:00
Show Raw Evidence JSON
{
    "zone_id": "osint_bosphorus",
    "zone_name": "Bosphorus\/Dardanelles Approach",
    "dwell_minutes": 279,
    "points_in_zone": 9,
    "first_point": {
        "ts": "2026-08-22T18:33:04+00:00",
        "lat": 40.70199670000000224945324589498341083526611328125,
        "lon": 29.459393299999998561133907060138881206512451171875
    },
    "last_point": {
        "ts": "2026-08-22T23:12:03+00:00",
        "lat": 40.7020116999999999052306520752608776092529296875,
        "lon": 29.45942670000000163099684868939220905303955078125
    }
}

Methodology: 2026.01.18

Zone Dwell Bosphorus/Dardanelles Approach Aug 22, 2026 16:18 UTC 80.0%
  • Zone: Bosphorus/Dardanelles Approach
  • Duration: 6h 33m
  • Data Points: 9 AIS positions
  • Period: 2026-08-22T16:21:03+00:00 to 2026-08-22T22:54:03+00:00
Show Raw Evidence JSON
{
    "zone_id": "osint_bosphorus",
    "zone_name": "Bosphorus\/Dardanelles Approach",
    "dwell_minutes": 393,
    "points_in_zone": 9,
    "first_point": {
        "ts": "2026-08-22T16:21:03+00:00",
        "lat": 40.7019949999999965939423418603837490081787109375,
        "lon": 29.45940999999999831970853847451508045196533203125
    },
    "last_point": {
        "ts": "2026-08-22T22:54:03+00:00",
        "lat": 40.70201329999999728670445620082318782806396484375,
        "lon": 29.459405000000000285353962681256234645843505859375
    }
}

Methodology: 2026.01.18

Zone Dwell Bosphorus/Dardanelles Approach Aug 22, 2026 15:45 UTC 80.0%
  • Zone: Bosphorus/Dardanelles Approach
  • Duration: 5h 36m
  • Data Points: 9 AIS positions
  • Period: 2026-08-22T15:45:03+00:00 to 2026-08-22T21:21:04+00:00
Show Raw Evidence JSON
{
    "zone_id": "osint_bosphorus",
    "zone_name": "Bosphorus\/Dardanelles Approach",
    "dwell_minutes": 336,
    "points_in_zone": 9,
    "first_point": {
        "ts": "2026-08-22T15:45:03+00:00",
        "lat": 40.7020150000000029422153602354228496551513671875,
        "lon": 29.45940999999999831970853847451508045196533203125
    },
    "last_point": {
        "ts": "2026-08-22T21:21:04+00:00",
        "lat": 40.7019949999999965939423418603837490081787109375,
        "lon": 29.459385000000001042508301907218992710113525390625
    }
}

Methodology: 2026.01.18

Loiter discovered_024 Jun 21, 2026 15:20 UTC 75.0%
  • Duration: 1h 38m
  • Radius: 348 meters
  • Data Points: 26 AIS positions
  • Centroid: 41.4307, 29.5947
  • Zone: discovered_024
Show Raw Evidence JSON
{
    "radius_m": 347.6000000000000227373675443232059478759765625,
    "duration_minutes": 98.7000000000000028421709430404007434844970703125,
    "points": 26,
    "centroid": {
        "lat": 41.43066012692307964471183368004858493804931640625,
        "lon": 29.594738915384613875403374549932777881622314453125
    },
    "bbox": {
        "min_lat": 41.4297882999999984576788847334682941436767578125,
        "min_lon": 29.591419999999999390638549812138080596923828125,
        "max_lat": 41.4324299999999965393726597540080547332763671875,
        "max_lon": 29.598168300000001096350388252176344394683837890625
    },
    "zone_id": "discovered_024"
}

Methodology: 2026.01.18

Zone Dwell discovered_024 Jun 21, 2026 15:05 UTC 80.0%
  • Zone: discovered_024
  • Duration: 1h 53m
  • Data Points: 30 AIS positions
  • Period: 2026-06-21T15:05:14+00:00 to 2026-06-21T16:59:04+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_024",
    "zone_name": "Istanbul Black Sea Surveillance Zone",
    "dwell_minutes": 113.7999999999999971578290569595992565155029296875,
    "points_in_zone": 30,
    "first_point": {
        "ts": "2026-06-21T15:05:14+00:00",
        "lat": 41.433193299999999226201907731592655181884765625,
        "lon": 29.59919670000000024856490199454128742218017578125
    },
    "last_point": {
        "ts": "2026-06-21T16:59:04+00:00",
        "lat": 41.42992170000000129448380903340876102447509765625,
        "lon": 29.591419999999999390638549812138080596923828125
    }
}

Methodology: 2026.01.18

Zone Dwell discovered_024 Jun 21, 2026 14:01 UTC 80.0%
  • Zone: discovered_024
  • Duration: 2h 57m
  • Data Points: 48 AIS positions
  • Period: 2026-06-21T14:01:14+00:00 to 2026-06-21T16:59:04+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_024",
    "zone_name": "Istanbul Black Sea Surveillance Zone",
    "dwell_minutes": 177.80000000000001136868377216160297393798828125,
    "points_in_zone": 48,
    "first_point": {
        "ts": "2026-06-21T14:01:14+00:00",
        "lat": 41.43743829999999661595211364328861236572265625,
        "lon": 29.602759999999999962483343551866710186004638671875
    },
    "last_point": {
        "ts": "2026-06-21T16:59:04+00:00",
        "lat": 41.42992170000000129448380903340876102447509765625,
        "lon": 29.591419999999999390638549812138080596923828125
    }
}

Methodology: 2026.01.18

Source snapshot

SanctionerAs ofEntity ID
🇬🇧 UK2025-09-299253909

We mirror official lists; always verify at the source.

Sanctioned on the same day

  • Bronco · IMO 8808525 🇪🇺 EU🇳🇿 NZ🇬🇧 UK
  • FURIA · IMO 9257802 🇪🇺 EU🇳🇿 NZ🇬🇧 UK
  • KARNEOL · IMO 9387255 🇪🇺 EU🇳🇿 NZ🇬🇧 UK
  • KUBERA · IMO 9292577 🇪🇺 EU🇬🇧 UK
  • MATARI · IMO 9253313 🇪🇺 EU🇬🇧 UK
  • MERIDIAN · IMO 9418482 🇪🇺 EU🇬🇧 UK
  • PIERRE · IMO 9266877 🇪🇺 EU🇬🇧 UK
  • Ragnar · IMO 9384095 🇪🇺 EU🇳🇿 NZ🇬🇧 UK