Okean

IMO 9142916

Vessel information

Vessel Name Okean
IMO Number 9142916
MMSI 273378580
Vessel Type Oil Products Tanker | Navire-citerne pour produits pétroliers
Flag 🇷🇺 Russia View flag history 📜
Call Sign UBQN2
Gross Tonnage 3,091 GT
Year Built 1996

Sanctioned by

🇪🇺 EU 2025-05-06🇬🇧 UK 2025-07-21

Company & Ownership

🏢
OOO Sakhoylservis
IMO Company: 5874541
Address ul Komsomolskaya 253, Yuzhno-Sakhalinsk, Sakhalinskaya oblast, 693000, Russia.
Status Active
Fleet 1.0 owner, 1.0 operator, 1.0 manager, 0.0 beneficial

Management & Operations

ISM Manager
NAYADA CO LTD
Room 708, ul Portovaya 3, Nakhodka, Primorskiy kray, 692900, Russia.
Commercial Manager
SAKHOYLSERVIS OOO
ul Komsomolskaya 253, Yuzhno-Sakhalinsk, Sakhalinskaya oblast, 693000, Russia.
Registered Owner
SAKHOYLSERVIS OOO
ul Komsomolskaya 253, Yuzhno-Sakhalinsk, Sakhalinskaya oblast, 693000, Russia.

Classification & Safety

Current Classification
Russian Maritime Register of Shipping Delivered

Port State Control (PSC) Inspections

⚠️
Risk Level
LOW
Last 36 Months
Last Inspection
📍 Vladivostok
📅 2015-03-27

Programs & Notes

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

DateOfListing: 2025-05-21 || DateDesignated: 2025-07-21 | 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 9142916 (“Okean”) is, has been or is likely to be 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, 9142916 is involved in carrying oil or oil products that originated in Russia from Russia to a third country.

Vessel Changes

4 changes

AIS Events

50 events detected • 2 zones • Last: Sep 9, 2026

Zone Dwell Prigorodnoye/Sakhalin LNG Sep 9, 2026 07:30 UTC 80.0%
  • Zone: Prigorodnoye/Sakhalin LNG
  • Duration: 2h 11m
  • Data Points: 64 AIS positions
  • Period: 2026-09-09T07:30:20+00:00 to 2026-09-09T09:42:00+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "dwell_minutes": 131.69999999999998863131622783839702606201171875,
    "points_in_zone": 64,
    "first_point": {
        "ts": "2026-09-09T07:30:20+00:00",
        "lat": 46.648425000000003137756721116602420806884765625,
        "lon": 142.655736700000005612309905700385570526123046875
    },
    "last_point": {
        "ts": "2026-09-09T09:42:00+00:00",
        "lat": 46.3505899999999968486008583568036556243896484375,
        "lon": 142.88583330000000159998307935893535614013671875
    }
}

Methodology: 2026.01.18

Zone Dwell Sakhalin South Approach Sep 9, 2026 07:30 UTC 80.0%
  • Zone: Sakhalin South Approach
  • Duration: 2h 11m
  • Data Points: 64 AIS positions
  • Period: 2026-09-09T07:30:20+00:00 to 2026-09-09T09:42:00+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "dwell_minutes": 131.69999999999998863131622783839702606201171875,
    "points_in_zone": 64,
    "first_point": {
        "ts": "2026-09-09T07:30:20+00:00",
        "lat": 46.648425000000003137756721116602420806884765625,
        "lon": 142.655736700000005612309905700385570526123046875
    },
    "last_point": {
        "ts": "2026-09-09T09:42:00+00:00",
        "lat": 46.3505899999999968486008583568036556243896484375,
        "lon": 142.88583330000000159998307935893535614013671875
    }
}

Methodology: 2026.01.18

Loiter Sakhalin South Approach Sep 8, 2026 12:01 UTC 75.0%
  • Duration: 1h 56m
  • Radius: 76 meters
  • Data Points: 34 AIS positions
  • Centroid: 46.6527, 142.6644
  • Zone: Sakhalin South Approach
Show Raw Evidence JSON
{
    "radius_m": 75.7999999999999971578290569595992565155029296875,
    "duration_minutes": 116.2000000000000028421709430404007434844970703125,
    "points": 34,
    "centroid": {
        "lat": 46.65273921470589613136326079256832599639892578125,
        "lon": 142.6644176029411710260319523513317108154296875
    },
    "bbox": {
        "min_lat": 46.65236999999999767396730021573603153228759765625,
        "min_lon": 142.664025000000009413270163349807262420654296875,
        "max_lat": 46.65336669999999941182977636344730854034423828125,
        "max_lon": 142.664838300000013759927242062985897064208984375
    },
    "zone_id": "russia_sakhalin_south"
}

Methodology: 2026.01.18

Loiter Prigorodnoye/Sakhalin LNG Sep 8, 2026 12:01 UTC 75.0%
  • Duration: 1h 56m
  • Radius: 76 meters
  • Data Points: 34 AIS positions
  • Centroid: 46.6527, 142.6644
  • Zone: Prigorodnoye/Sakhalin LNG
Show Raw Evidence JSON
{
    "radius_m": 75.7999999999999971578290569595992565155029296875,
    "duration_minutes": 116.2000000000000028421709430404007434844970703125,
    "points": 34,
    "centroid": {
        "lat": 46.65273921470589613136326079256832599639892578125,
        "lon": 142.6644176029411710260319523513317108154296875
    },
    "bbox": {
        "min_lat": 46.65236999999999767396730021573603153228759765625,
        "min_lon": 142.664025000000009413270163349807262420654296875,
        "max_lat": 46.65336669999999941182977636344730854034423828125,
        "max_lon": 142.664838300000013759927242062985897064208984375
    },
    "zone_id": "russia_prigorodnoye"
}

Methodology: 2026.01.18

Zone Dwell Prigorodnoye/Sakhalin LNG Sep 8, 2026 12:01 UTC 80.0%
  • Zone: Prigorodnoye/Sakhalin LNG
  • Duration: 1h 56m
  • Data Points: 34 AIS positions
  • Period: 2026-09-08T12:01:30+00:00 to 2026-09-08T13:57:39+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "dwell_minutes": 116.2000000000000028421709430404007434844970703125,
    "points_in_zone": 34,
    "first_point": {
        "ts": "2026-09-08T12:01:30+00:00",
        "lat": 46.65290829999999999699866748414933681488037109375,
        "lon": 142.664591699999988350100466050207614898681640625
    },
    "last_point": {
        "ts": "2026-09-08T13:57:39+00:00",
        "lat": 46.652528300000000172076397575438022613525390625,
        "lon": 142.664361700000000610089045949280261993408203125
    }
}

Methodology: 2026.01.18

Zone Dwell Sakhalin South Approach Sep 8, 2026 12:01 UTC 80.0%
  • Zone: Sakhalin South Approach
  • Duration: 1h 56m
  • Data Points: 34 AIS positions
  • Period: 2026-09-08T12:01:30+00:00 to 2026-09-08T13:57:39+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "dwell_minutes": 116.2000000000000028421709430404007434844970703125,
    "points_in_zone": 34,
    "first_point": {
        "ts": "2026-09-08T12:01:30+00:00",
        "lat": 46.65290829999999999699866748414933681488037109375,
        "lon": 142.664591699999988350100466050207614898681640625
    },
    "last_point": {
        "ts": "2026-09-08T13:57:39+00:00",
        "lat": 46.652528300000000172076397575438022613525390625,
        "lon": 142.664361700000000610089045949280261993408203125
    }
}

Methodology: 2026.01.18

Loiter Sakhalin South Approach Sep 8, 2026 11:00 UTC 75.0%
  • Duration: 2h 57m
  • Radius: 68 meters
  • Data Points: 46 AIS positions
  • Centroid: 46.6528, 142.6645
  • Zone: Sakhalin South Approach
Show Raw Evidence JSON
{
    "radius_m": 67.7999999999999971578290569595992565155029296875,
    "duration_minutes": 177.599999999999994315658113919198513031005859375,
    "points": 46,
    "centroid": {
        "lat": 46.6527896347826214196174987591803073883056640625,
        "lon": 142.664518915217371386461309157311916351318359375
    },
    "bbox": {
        "min_lat": 46.65236999999999767396730021573603153228759765625,
        "min_lon": 142.664025000000009413270163349807262420654296875,
        "max_lat": 46.65336669999999941182977636344730854034423828125,
        "max_lon": 142.6649482999999918320099823176860809326171875
    },
    "zone_id": "russia_sakhalin_south"
}

Methodology: 2026.01.18

Loiter Prigorodnoye/Sakhalin LNG Sep 8, 2026 11:00 UTC 75.0%
  • Duration: 2h 57m
  • Radius: 68 meters
  • Data Points: 46 AIS positions
  • Centroid: 46.6528, 142.6645
  • Zone: Prigorodnoye/Sakhalin LNG
Show Raw Evidence JSON
{
    "radius_m": 67.7999999999999971578290569595992565155029296875,
    "duration_minutes": 177.599999999999994315658113919198513031005859375,
    "points": 46,
    "centroid": {
        "lat": 46.6527896347826214196174987591803073883056640625,
        "lon": 142.664518915217371386461309157311916351318359375
    },
    "bbox": {
        "min_lat": 46.65236999999999767396730021573603153228759765625,
        "min_lon": 142.664025000000009413270163349807262420654296875,
        "max_lat": 46.65336669999999941182977636344730854034423828125,
        "max_lon": 142.6649482999999918320099823176860809326171875
    },
    "zone_id": "russia_prigorodnoye"
}

Methodology: 2026.01.18

Zone Dwell Sakhalin South Approach Sep 8, 2026 11:00 UTC 80.0%
  • Zone: Sakhalin South Approach
  • Duration: 2h 57m
  • Data Points: 46 AIS positions
  • Period: 2026-09-08T11:00:04+00:00 to 2026-09-08T13:57:39+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "dwell_minutes": 177.599999999999994315658113919198513031005859375,
    "points_in_zone": 46,
    "first_point": {
        "ts": "2026-09-08T11:00:04+00:00",
        "lat": 46.653023300000000972431735135614871978759765625,
        "lon": 142.6649482999999918320099823176860809326171875
    },
    "last_point": {
        "ts": "2026-09-08T13:57:39+00:00",
        "lat": 46.652528300000000172076397575438022613525390625,
        "lon": 142.664361700000000610089045949280261993408203125
    }
}

Methodology: 2026.01.18

Zone Dwell Prigorodnoye/Sakhalin LNG Sep 8, 2026 11:00 UTC 80.0%
  • Zone: Prigorodnoye/Sakhalin LNG
  • Duration: 2h 57m
  • Data Points: 46 AIS positions
  • Period: 2026-09-08T11:00:04+00:00 to 2026-09-08T13:57:39+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "dwell_minutes": 177.599999999999994315658113919198513031005859375,
    "points_in_zone": 46,
    "first_point": {
        "ts": "2026-09-08T11:00:04+00:00",
        "lat": 46.653023300000000972431735135614871978759765625,
        "lon": 142.6649482999999918320099823176860809326171875
    },
    "last_point": {
        "ts": "2026-09-08T13:57:39+00:00",
        "lat": 46.652528300000000172076397575438022613525390625,
        "lon": 142.664361700000000610089045949280261993408203125
    }
}

Methodology: 2026.01.18

Loiter Sakhalin South Approach Sep 8, 2026 10:03 UTC 75.0%
  • Duration: 3h 54m
  • Radius: 165 meters
  • Data Points: 54 AIS positions
  • Centroid: 46.6530, 142.6645
  • Zone: Sakhalin South Approach
Show Raw Evidence JSON
{
    "radius_m": 165.30000000000001136868377216160297393798828125,
    "duration_minutes": 234.599999999999994315658113919198513031005859375,
    "points": 54,
    "centroid": {
        "lat": 46.65297117037035690145785338245332241058349609375,
        "lon": 142.664451668518495353055186569690704345703125
    },
    "bbox": {
        "min_lat": 46.65236999999999767396730021573603153228759765625,
        "min_lon": 142.663534999999995989128365181386470794677734375,
        "max_lat": 46.65433999999999770125214126892387866973876953125,
        "max_lon": 142.6649482999999918320099823176860809326171875
    },
    "zone_id": "russia_sakhalin_south"
}

Methodology: 2026.01.18

Loiter Prigorodnoye/Sakhalin LNG Sep 8, 2026 10:03 UTC 75.0%
  • Duration: 3h 54m
  • Radius: 165 meters
  • Data Points: 54 AIS positions
  • Centroid: 46.6530, 142.6645
  • Zone: Prigorodnoye/Sakhalin LNG
Show Raw Evidence JSON
{
    "radius_m": 165.30000000000001136868377216160297393798828125,
    "duration_minutes": 234.599999999999994315658113919198513031005859375,
    "points": 54,
    "centroid": {
        "lat": 46.65297117037035690145785338245332241058349609375,
        "lon": 142.664451668518495353055186569690704345703125
    },
    "bbox": {
        "min_lat": 46.65236999999999767396730021573603153228759765625,
        "min_lon": 142.663534999999995989128365181386470794677734375,
        "max_lat": 46.65433999999999770125214126892387866973876953125,
        "max_lon": 142.6649482999999918320099823176860809326171875
    },
    "zone_id": "russia_prigorodnoye"
}

Methodology: 2026.01.18

Zone Dwell Prigorodnoye/Sakhalin LNG Sep 8, 2026 10:03 UTC 80.0%
  • Zone: Prigorodnoye/Sakhalin LNG
  • Duration: 3h 54m
  • Data Points: 54 AIS positions
  • Period: 2026-09-08T10:03:01+00:00 to 2026-09-08T13:57:39+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "dwell_minutes": 234.599999999999994315658113919198513031005859375,
    "points_in_zone": 54,
    "first_point": {
        "ts": "2026-09-08T10:03:01+00:00",
        "lat": 46.6543266999999985955582815222442150115966796875,
        "lon": 142.66374999999999317878973670303821563720703125
    },
    "last_point": {
        "ts": "2026-09-08T13:57:39+00:00",
        "lat": 46.652528300000000172076397575438022613525390625,
        "lon": 142.664361700000000610089045949280261993408203125
    }
}

Methodology: 2026.01.18

Zone Dwell Sakhalin South Approach Sep 8, 2026 10:03 UTC 80.0%
  • Zone: Sakhalin South Approach
  • Duration: 3h 54m
  • Data Points: 54 AIS positions
  • Period: 2026-09-08T10:03:01+00:00 to 2026-09-08T13:57:39+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "dwell_minutes": 234.599999999999994315658113919198513031005859375,
    "points_in_zone": 54,
    "first_point": {
        "ts": "2026-09-08T10:03:01+00:00",
        "lat": 46.6543266999999985955582815222442150115966796875,
        "lon": 142.66374999999999317878973670303821563720703125
    },
    "last_point": {
        "ts": "2026-09-08T13:57:39+00:00",
        "lat": 46.652528300000000172076397575438022613525390625,
        "lon": 142.664361700000000610089045949280261993408203125
    }
}

Methodology: 2026.01.18

Loiter Sakhalin South Approach Sep 8, 2026 09:03 UTC 75.0%
  • Duration: 4h 54m
  • Radius: 144 meters
  • Data Points: 74 AIS positions
  • Centroid: 46.6534, 142.6642
  • Zone: Sakhalin South Approach
Show Raw Evidence JSON
{
    "radius_m": 143.80000000000001136868377216160297393798828125,
    "duration_minutes": 294.6000000000000227373675443232059478759765625,
    "points": 74,
    "centroid": {
        "lat": 46.653368671621620933365193195641040802001953125,
        "lon": 142.66418943783781969614210538566112518310546875
    },
    "bbox": {
        "min_lat": 46.65236999999999767396730021573603153228759765625,
        "min_lon": 142.663231700000011414886103011667728424072265625,
        "max_lat": 46.65449170000000123081917990930378437042236328125,
        "max_lon": 142.6649482999999918320099823176860809326171875
    },
    "zone_id": "russia_sakhalin_south"
}

Methodology: 2026.01.18

Loiter Prigorodnoye/Sakhalin LNG Sep 8, 2026 09:03 UTC 75.0%
  • Duration: 4h 54m
  • Radius: 144 meters
  • Data Points: 74 AIS positions
  • Centroid: 46.6534, 142.6642
  • Zone: Prigorodnoye/Sakhalin LNG
Show Raw Evidence JSON
{
    "radius_m": 143.80000000000001136868377216160297393798828125,
    "duration_minutes": 294.6000000000000227373675443232059478759765625,
    "points": 74,
    "centroid": {
        "lat": 46.653368671621620933365193195641040802001953125,
        "lon": 142.66418943783781969614210538566112518310546875
    },
    "bbox": {
        "min_lat": 46.65236999999999767396730021573603153228759765625,
        "min_lon": 142.663231700000011414886103011667728424072265625,
        "max_lat": 46.65449170000000123081917990930378437042236328125,
        "max_lon": 142.6649482999999918320099823176860809326171875
    },
    "zone_id": "russia_prigorodnoye"
}

Methodology: 2026.01.18

Zone Dwell Prigorodnoye/Sakhalin LNG Sep 8, 2026 09:03 UTC 80.0%
  • Zone: Prigorodnoye/Sakhalin LNG
  • Duration: 4h 54m
  • Data Points: 74 AIS positions
  • Period: 2026-09-08T09:03:02+00:00 to 2026-09-08T13:57:39+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "dwell_minutes": 294.6000000000000227373675443232059478759765625,
    "points_in_zone": 74,
    "first_point": {
        "ts": "2026-09-08T09:03:02+00:00",
        "lat": 46.65448669999999964375092531554400920867919921875,
        "lon": 142.663361699999995835241861641407012939453125
    },
    "last_point": {
        "ts": "2026-09-08T13:57:39+00:00",
        "lat": 46.652528300000000172076397575438022613525390625,
        "lon": 142.664361700000000610089045949280261993408203125
    }
}

Methodology: 2026.01.18

Zone Dwell Sakhalin South Approach Sep 8, 2026 09:03 UTC 80.0%
  • Zone: Sakhalin South Approach
  • Duration: 4h 54m
  • Data Points: 74 AIS positions
  • Period: 2026-09-08T09:03:02+00:00 to 2026-09-08T13:57:39+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "dwell_minutes": 294.6000000000000227373675443232059478759765625,
    "points_in_zone": 74,
    "first_point": {
        "ts": "2026-09-08T09:03:02+00:00",
        "lat": 46.65448669999999964375092531554400920867919921875,
        "lon": 142.663361699999995835241861641407012939453125
    },
    "last_point": {
        "ts": "2026-09-08T13:57:39+00:00",
        "lat": 46.652528300000000172076397575438022613525390625,
        "lon": 142.664361700000000610089045949280261993408203125
    }
}

Methodology: 2026.01.18

Loiter Sakhalin South Approach Sep 8, 2026 08:17 UTC 75.0%
  • Duration: 5h 55m
  • Radius: 1,362 meters
  • Data Points: 91 AIS positions
  • Centroid: 46.6534, 142.6632
  • Zone: Sakhalin South Approach
Show Raw Evidence JSON
{
    "radius_m": 1361.5,
    "duration_minutes": 355.8999999999999772626324556767940521240234375,
    "points": 91,
    "centroid": {
        "lat": 46.65344866483514607580218580551445484161376953125,
        "lon": 142.663155165934114165793289430439472198486328125
    },
    "bbox": {
        "min_lat": 46.64928499999999900182956480421125888824462890625,
        "min_lon": 142.645728300000001809166860766708850860595703125,
        "max_lat": 46.65635670000000345680746249854564666748046875,
        "max_lon": 142.6649482999999918320099823176860809326171875
    },
    "zone_id": "russia_sakhalin_south"
}

Methodology: 2026.01.18

Loiter Prigorodnoye/Sakhalin LNG Sep 8, 2026 08:17 UTC 75.0%
  • Duration: 5h 55m
  • Radius: 1,362 meters
  • Data Points: 91 AIS positions
  • Centroid: 46.6534, 142.6632
  • Zone: Prigorodnoye/Sakhalin LNG
Show Raw Evidence JSON
{
    "radius_m": 1361.5,
    "duration_minutes": 355.8999999999999772626324556767940521240234375,
    "points": 91,
    "centroid": {
        "lat": 46.65344866483514607580218580551445484161376953125,
        "lon": 142.663155165934114165793289430439472198486328125
    },
    "bbox": {
        "min_lat": 46.64928499999999900182956480421125888824462890625,
        "min_lon": 142.645728300000001809166860766708850860595703125,
        "max_lat": 46.65635670000000345680746249854564666748046875,
        "max_lon": 142.6649482999999918320099823176860809326171875
    },
    "zone_id": "russia_prigorodnoye"
}

Methodology: 2026.01.18

Zone Dwell Prigorodnoye/Sakhalin LNG Sep 8, 2026 08:01 UTC 80.0%
  • Zone: Prigorodnoye/Sakhalin LNG
  • Duration: 5h 55m
  • Data Points: 91 AIS positions
  • Period: 2026-09-08T08:01:44+00:00 to 2026-09-08T13:57:39+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "dwell_minutes": 355.8999999999999772626324556767940521240234375,
    "points_in_zone": 91,
    "first_point": {
        "ts": "2026-09-08T08:01:44+00:00",
        "lat": 46.65140999999999849023879505693912506103515625,
        "lon": 142.645881699999989677962730638682842254638671875
    },
    "last_point": {
        "ts": "2026-09-08T13:57:39+00:00",
        "lat": 46.652528300000000172076397575438022613525390625,
        "lon": 142.664361700000000610089045949280261993408203125
    }
}

Methodology: 2026.01.18

Zone Dwell Sakhalin South Approach Sep 8, 2026 08:01 UTC 80.0%
  • Zone: Sakhalin South Approach
  • Duration: 5h 55m
  • Data Points: 91 AIS positions
  • Period: 2026-09-08T08:01:44+00:00 to 2026-09-08T13:57:39+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "dwell_minutes": 355.8999999999999772626324556767940521240234375,
    "points_in_zone": 91,
    "first_point": {
        "ts": "2026-09-08T08:01:44+00:00",
        "lat": 46.65140999999999849023879505693912506103515625,
        "lon": 142.645881699999989677962730638682842254638671875
    },
    "last_point": {
        "ts": "2026-09-08T13:57:39+00:00",
        "lat": 46.652528300000000172076397575438022613525390625,
        "lon": 142.664361700000000610089045949280261993408203125
    }
}

Methodology: 2026.01.18

Loiter Sakhalin South Approach Sep 8, 2026 07:23 UTC 75.0%
  • Duration: 6h 34m
  • Radius: 1,206 meters
  • Data Points: 103 AIS positions
  • Centroid: 46.6532, 142.6612
  • Zone: Sakhalin South Approach
Show Raw Evidence JSON
{
    "radius_m": 1206.200000000000045474735088646411895751953125,
    "duration_minutes": 394.6000000000000227373675443232059478759765625,
    "points": 103,
    "centroid": {
        "lat": 46.653213609708728881741990335285663604736328125,
        "lon": 142.661153594174805903094238601624965667724609375
    },
    "bbox": {
        "min_lat": 46.64928499999999900182956480421125888824462890625,
        "min_lon": 142.645728300000001809166860766708850860595703125,
        "max_lat": 46.65635670000000345680746249854564666748046875,
        "max_lon": 142.6649482999999918320099823176860809326171875
    },
    "zone_id": "russia_sakhalin_south"
}

Methodology: 2026.01.18

Loiter Prigorodnoye/Sakhalin LNG Sep 8, 2026 07:23 UTC 75.0%
  • Duration: 6h 34m
  • Radius: 1,206 meters
  • Data Points: 103 AIS positions
  • Centroid: 46.6532, 142.6612
  • Zone: Prigorodnoye/Sakhalin LNG
Show Raw Evidence JSON
{
    "radius_m": 1206.200000000000045474735088646411895751953125,
    "duration_minutes": 394.6000000000000227373675443232059478759765625,
    "points": 103,
    "centroid": {
        "lat": 46.653213609708728881741990335285663604736328125,
        "lon": 142.661153594174805903094238601624965667724609375
    },
    "bbox": {
        "min_lat": 46.64928499999999900182956480421125888824462890625,
        "min_lon": 142.645728300000001809166860766708850860595703125,
        "max_lat": 46.65635670000000345680746249854564666748046875,
        "max_lon": 142.6649482999999918320099823176860809326171875
    },
    "zone_id": "russia_prigorodnoye"
}

Methodology: 2026.01.18

Sts🛰️✗ Sakhalin South Approach Sep 8, 2026 07:03 UTC 85/100
Vessel A: Omsk (OMSK) Russia
Vessel B: Okean (OKEAN) RUSSIA
  • Minimum Distance: 6 meters
  • Average Distance: 10 meters
  • Duration: 1h 6m
  • Period: 2026-09-08T07:03:46+00:00 to 2026-09-08T08:09:46+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Sakhalin South Approach

Confidence Analysis

Score: 85/100

High-confidence STS candidate. Two tankers (OMSK and OKEAN) maintained close proximity (min 6m, avg 10m) for 66 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Sakhalin South Approach, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness25/25Min distance 6m, avg 10m
Duration15/25Duration 66 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±2m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Sakhalin South Approach

🛰️ Satellite Corroboration

✗ SAR Not Available

No satellite imagery for this time/location

No Sentinel-1 scenes covering AOI and time window

Searched: 2026-09-08T13:45:09.201526+00:00

Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273371330,
        "imo": 9418509,
        "name": "OMSK",
        "flag": "Russia"
    },
    "vessel_b": {
        "mmsi": 273378580,
        "imo": 9142916,
        "name": "OKEAN",
        "flag": "RUSSIA"
    },
    "min_distance_m": 5.5,
    "avg_distance_m": 9.5,
    "distance_consistency_m": 2.20000000000000017763568394002504646778106689453125,
    "duration_minutes": 66,
    "overlap_duration_s": 3960,
    "speed_a_avg": 0.0299999999999999988897769753748434595763683319091796875,
    "speed_a_std": 0.05000000000000000277555756156289135105907917022705078125,
    "speed_b_avg": 0.0200000000000000004163336342344337026588618755340576171875,
    "speed_b_std": 0.040000000000000000832667268468867405317723751068115234375,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.0299999999999999988897769753748434595763683319091796875,
            "max_sog": 0.1000000000000000055511151231257827021181583404541015625
        },
        "vessel_b": {
            "avg_sog": 0.0200000000000000004163336342344337026588618755340576171875,
            "max_sog": 0.1000000000000000055511151231257827021181583404541015625
        }
    },
    "time_window": {
        "start": "2026-09-08T07:03:46+00:00",
        "end": "2026-09-08T08:09:46+00:00"
    },
    "points_count": {
        "vessel_a": 19,
        "vessel_b": 19
    },
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "score": {
        "value": 85,
        "components": {
            "distance_tightness": {
                "score": 25,
                "max": 25,
                "detail": "Min distance 6m, avg 10m"
            },
            "duration": {
                "score": 15,
                "max": 25,
                "detail": "Duration 66 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b12m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Sakhalin South Approach"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (OMSK and OKEAN) maintained close proximity (min 6m, avg 10m) for 66 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Sakhalin South Approach, a known STS activity area."
    },
    "sar": {
        "status": "not_found",
        "centroid": {
            "lat": 46.651433400000001938678906299173831939697265625,
            "lon": 142.646031099999987645787768997251987457275390625
        },
        "time_window": {
            "start_ts": "2026-09-08T07:03:46+00:00",
            "end_ts": "2026-09-08T08:09:46+00:00"
        },
        "searched_at": "2026-09-08T13:45:09.201526+00:00",
        "notes": "No Sentinel-1 scenes covering AOI and time window"
    }
}

Methodology: 2026.01.18

Sts🛰️✗ Prigorodnoye/Sakhalin LNG Sep 8, 2026 07:03 UTC 85/100
Vessel A: Omsk (OMSK) Russia
Vessel B: Okean (OKEAN) RUSSIA
  • Minimum Distance: 6 meters
  • Average Distance: 10 meters
  • Duration: 1h 6m
  • Period: 2026-09-08T07:03:46+00:00 to 2026-09-08T08:09:46+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Prigorodnoye/Sakhalin LNG

Confidence Analysis

Score: 85/100

High-confidence STS candidate. Two tankers (OMSK and OKEAN) maintained close proximity (min 6m, avg 10m) for 66 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Prigorodnoye/Sakhalin LNG, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness25/25Min distance 6m, avg 10m
Duration15/25Duration 66 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±2m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Prigorodnoye/Sakhalin LNG

🛰️ Satellite Corroboration

✗ SAR Not Available

No satellite imagery for this time/location

No Sentinel-1 scenes covering AOI and time window

Searched: 2026-09-08T13:45:06.784513+00:00

Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273371330,
        "imo": 9418509,
        "name": "OMSK",
        "flag": "Russia"
    },
    "vessel_b": {
        "mmsi": 273378580,
        "imo": 9142916,
        "name": "OKEAN",
        "flag": "RUSSIA"
    },
    "min_distance_m": 5.5,
    "avg_distance_m": 9.5,
    "distance_consistency_m": 2.20000000000000017763568394002504646778106689453125,
    "duration_minutes": 66,
    "overlap_duration_s": 3960,
    "speed_a_avg": 0.0299999999999999988897769753748434595763683319091796875,
    "speed_a_std": 0.05000000000000000277555756156289135105907917022705078125,
    "speed_b_avg": 0.0200000000000000004163336342344337026588618755340576171875,
    "speed_b_std": 0.040000000000000000832667268468867405317723751068115234375,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.0299999999999999988897769753748434595763683319091796875,
            "max_sog": 0.1000000000000000055511151231257827021181583404541015625
        },
        "vessel_b": {
            "avg_sog": 0.0200000000000000004163336342344337026588618755340576171875,
            "max_sog": 0.1000000000000000055511151231257827021181583404541015625
        }
    },
    "time_window": {
        "start": "2026-09-08T07:03:46+00:00",
        "end": "2026-09-08T08:09:46+00:00"
    },
    "points_count": {
        "vessel_a": 19,
        "vessel_b": 19
    },
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "score": {
        "value": 85,
        "components": {
            "distance_tightness": {
                "score": 25,
                "max": 25,
                "detail": "Min distance 6m, avg 10m"
            },
            "duration": {
                "score": 15,
                "max": 25,
                "detail": "Duration 66 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b12m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Prigorodnoye\/Sakhalin LNG"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (OMSK and OKEAN) maintained close proximity (min 6m, avg 10m) for 66 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Prigorodnoye\/Sakhalin LNG, a known STS activity area."
    },
    "sar": {
        "status": "not_found",
        "centroid": {
            "lat": 46.651433400000001938678906299173831939697265625,
            "lon": 142.646031099999987645787768997251987457275390625
        },
        "time_window": {
            "start_ts": "2026-09-08T07:03:46+00:00",
            "end_ts": "2026-09-08T08:09:46+00:00"
        },
        "searched_at": "2026-09-08T13:45:06.784513+00:00",
        "notes": "No Sentinel-1 scenes covering AOI and time window"
    }
}

Methodology: 2026.01.18

Zone Dwell Sakhalin South Approach Sep 8, 2026 07:03 UTC 80.0%
  • Zone: Sakhalin South Approach
  • Duration: 6h 34m
  • Data Points: 103 AIS positions
  • Period: 2026-09-08T07:23:03+00:00 to 2026-09-08T13:57:39+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "dwell_minutes": 394.6000000000000227373675443232059478759765625,
    "points_in_zone": 103,
    "first_point": {
        "ts": "2026-09-08T07:23:03+00:00",
        "lat": 46.651448299999998425846570171415805816650390625,
        "lon": 142.646018300000008593997335992753505706787109375
    },
    "last_point": {
        "ts": "2026-09-08T13:57:39+00:00",
        "lat": 46.652528300000000172076397575438022613525390625,
        "lon": 142.664361700000000610089045949280261993408203125
    }
}

Methodology: 2026.01.18

Zone Dwell Prigorodnoye/Sakhalin LNG Sep 8, 2026 07:03 UTC 80.0%
  • Zone: Prigorodnoye/Sakhalin LNG
  • Duration: 6h 34m
  • Data Points: 103 AIS positions
  • Period: 2026-09-08T07:23:03+00:00 to 2026-09-08T13:57:39+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "dwell_minutes": 394.6000000000000227373675443232059478759765625,
    "points_in_zone": 103,
    "first_point": {
        "ts": "2026-09-08T07:23:03+00:00",
        "lat": 46.651448299999998425846570171415805816650390625,
        "lon": 142.646018300000008593997335992753505706787109375
    },
    "last_point": {
        "ts": "2026-09-08T13:57:39+00:00",
        "lat": 46.652528300000000172076397575438022613525390625,
        "lon": 142.664361700000000610089045949280261993408203125
    }
}

Methodology: 2026.01.18

Sts🛰️✗ Sakhalin South Approach Sep 8, 2026 06:03 UTC 95/100
Vessel A: Omsk (OMSK) Russia
Vessel B: Okean (OKEAN) RUSSIA
  • Minimum Distance: 5 meters
  • Average Distance: 9 meters
  • Duration: 2h 6m
  • Period: 2026-09-08T06:03:45+00:00 to 2026-09-08T08:09:46+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Sakhalin South Approach

Confidence Analysis

Score: 95/100

High-confidence STS candidate. Two tankers (OMSK and OKEAN) maintained close proximity (min 5m, avg 9m) for 126 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Sakhalin South Approach, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness25/25Min distance 5m, avg 9m
Duration25/25Duration 126 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±2m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Sakhalin South Approach

🛰️ Satellite Corroboration

✗ SAR Not Available

No satellite imagery for this time/location

No Sentinel-1 scenes covering AOI and time window

Searched: 2026-09-08T12:45:09.205531+00:00

Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273371330,
        "imo": 9418509,
        "name": "OMSK",
        "flag": "Russia"
    },
    "vessel_b": {
        "mmsi": 273378580,
        "imo": 9142916,
        "name": "OKEAN",
        "flag": "RUSSIA"
    },
    "min_distance_m": 4.9000000000000003552713678800500929355621337890625,
    "avg_distance_m": 8.9000000000000003552713678800500929355621337890625,
    "distance_consistency_m": 1.899999999999999911182158029987476766109466552734375,
    "duration_minutes": 126,
    "overlap_duration_s": 7561,
    "speed_a_avg": 0.0200000000000000004163336342344337026588618755340576171875,
    "speed_a_std": 0.040000000000000000832667268468867405317723751068115234375,
    "speed_b_avg": 0.0200000000000000004163336342344337026588618755340576171875,
    "speed_b_std": 0.040000000000000000832667268468867405317723751068115234375,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.0200000000000000004163336342344337026588618755340576171875,
            "max_sog": 0.1000000000000000055511151231257827021181583404541015625
        },
        "vessel_b": {
            "avg_sog": 0.0200000000000000004163336342344337026588618755340576171875,
            "max_sog": 0.1000000000000000055511151231257827021181583404541015625
        }
    },
    "time_window": {
        "start": "2026-09-08T06:03:45+00:00",
        "end": "2026-09-08T08:09:46+00:00"
    },
    "points_count": {
        "vessel_a": 37,
        "vessel_b": 37
    },
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "score": {
        "value": 95,
        "components": {
            "distance_tightness": {
                "score": 25,
                "max": 25,
                "detail": "Min distance 5m, avg 9m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 126 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b12m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Sakhalin South Approach"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (OMSK and OKEAN) maintained close proximity (min 5m, avg 9m) for 126 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Sakhalin South Approach, a known STS activity area."
    },
    "sar": {
        "status": "not_found",
        "centroid": {
            "lat": 46.65144409999999908222889644093811511993408203125,
            "lon": 142.64605960000000095533323474228382110595703125
        },
        "time_window": {
            "start_ts": "2026-09-08T06:03:45+00:00",
            "end_ts": "2026-09-08T08:09:46+00:00"
        },
        "searched_at": "2026-09-08T12:45:09.205531+00:00",
        "notes": "No Sentinel-1 scenes covering AOI and time window"
    }
}

Methodology: 2026.01.18

Sts🛰️✗ Prigorodnoye/Sakhalin LNG Sep 8, 2026 06:03 UTC 95/100
Vessel A: Omsk (OMSK) Russia
Vessel B: Okean (OKEAN) RUSSIA
  • Minimum Distance: 5 meters
  • Average Distance: 9 meters
  • Duration: 2h 6m
  • Period: 2026-09-08T06:03:45+00:00 to 2026-09-08T08:09:46+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Prigorodnoye/Sakhalin LNG

Confidence Analysis

Score: 95/100

High-confidence STS candidate. Two tankers (OMSK and OKEAN) maintained close proximity (min 5m, avg 9m) for 126 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Prigorodnoye/Sakhalin LNG, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness25/25Min distance 5m, avg 9m
Duration25/25Duration 126 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±2m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Prigorodnoye/Sakhalin LNG

🛰️ Satellite Corroboration

✗ SAR Not Available

No satellite imagery for this time/location

No Sentinel-1 scenes covering AOI and time window

Searched: 2026-09-08T12:45:06.818386+00:00

Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273371330,
        "imo": 9418509,
        "name": "OMSK",
        "flag": "Russia"
    },
    "vessel_b": {
        "mmsi": 273378580,
        "imo": 9142916,
        "name": "OKEAN",
        "flag": "RUSSIA"
    },
    "min_distance_m": 4.9000000000000003552713678800500929355621337890625,
    "avg_distance_m": 8.9000000000000003552713678800500929355621337890625,
    "distance_consistency_m": 1.899999999999999911182158029987476766109466552734375,
    "duration_minutes": 126,
    "overlap_duration_s": 7561,
    "speed_a_avg": 0.0200000000000000004163336342344337026588618755340576171875,
    "speed_a_std": 0.040000000000000000832667268468867405317723751068115234375,
    "speed_b_avg": 0.0200000000000000004163336342344337026588618755340576171875,
    "speed_b_std": 0.040000000000000000832667268468867405317723751068115234375,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.0200000000000000004163336342344337026588618755340576171875,
            "max_sog": 0.1000000000000000055511151231257827021181583404541015625
        },
        "vessel_b": {
            "avg_sog": 0.0200000000000000004163336342344337026588618755340576171875,
            "max_sog": 0.1000000000000000055511151231257827021181583404541015625
        }
    },
    "time_window": {
        "start": "2026-09-08T06:03:45+00:00",
        "end": "2026-09-08T08:09:46+00:00"
    },
    "points_count": {
        "vessel_a": 37,
        "vessel_b": 37
    },
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "score": {
        "value": 95,
        "components": {
            "distance_tightness": {
                "score": 25,
                "max": 25,
                "detail": "Min distance 5m, avg 9m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 126 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b12m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Prigorodnoye\/Sakhalin LNG"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (OMSK and OKEAN) maintained close proximity (min 5m, avg 9m) for 126 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Prigorodnoye\/Sakhalin LNG, a known STS activity area."
    },
    "sar": {
        "status": "not_found",
        "centroid": {
            "lat": 46.65144409999999908222889644093811511993408203125,
            "lon": 142.64605960000000095533323474228382110595703125
        },
        "time_window": {
            "start_ts": "2026-09-08T06:03:45+00:00",
            "end_ts": "2026-09-08T08:09:46+00:00"
        },
        "searched_at": "2026-09-08T12:45:06.818386+00:00",
        "notes": "No Sentinel-1 scenes covering AOI and time window"
    }
}

Methodology: 2026.01.18

Loiter Sakhalin South Approach Sep 8, 2026 06:01 UTC 75.0%
  • Duration: 2h 4m
  • Radius: 1,167 meters
  • Data Points: 39 AIS positions
  • Centroid: 46.6517, 142.6471
  • Zone: Sakhalin South Approach
Show Raw Evidence JSON
{
    "radius_m": 1166.59999999999990905052982270717620849609375,
    "duration_minutes": 124.900000000000005684341886080801486968994140625,
    "points": 39,
    "centroid": {
        "lat": 46.65170362564102646274477592669427394866943359375,
        "lon": 142.647100092307681507008965127170085906982421875
    },
    "bbox": {
        "min_lat": 46.64928499999999900182956480421125888824462890625,
        "min_lon": 142.645728300000001809166860766708850860595703125,
        "max_lat": 46.65635670000000345680746249854564666748046875,
        "max_lon": 142.660760000000010450094123370945453643798828125
    },
    "zone_id": "russia_sakhalin_south"
}

Methodology: 2026.01.18

Loiter Prigorodnoye/Sakhalin LNG Sep 8, 2026 06:01 UTC 75.0%
  • Duration: 2h 4m
  • Radius: 1,167 meters
  • Data Points: 39 AIS positions
  • Centroid: 46.6517, 142.6471
  • Zone: Prigorodnoye/Sakhalin LNG
Show Raw Evidence JSON
{
    "radius_m": 1166.59999999999990905052982270717620849609375,
    "duration_minutes": 124.900000000000005684341886080801486968994140625,
    "points": 39,
    "centroid": {
        "lat": 46.65170362564102646274477592669427394866943359375,
        "lon": 142.647100092307681507008965127170085906982421875
    },
    "bbox": {
        "min_lat": 46.64928499999999900182956480421125888824462890625,
        "min_lon": 142.645728300000001809166860766708850860595703125,
        "max_lat": 46.65635670000000345680746249854564666748046875,
        "max_lon": 142.660760000000010450094123370945453643798828125
    },
    "zone_id": "russia_prigorodnoye"
}

Methodology: 2026.01.18

Zone Dwell Prigorodnoye/Sakhalin LNG Sep 8, 2026 06:01 UTC 80.0%
  • Zone: Prigorodnoye/Sakhalin LNG
  • Duration: 6h 37m
  • Data Points: 101 AIS positions
  • Period: 2026-09-08T06:50:44+00:00 to 2026-09-08T13:27:54+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "dwell_minutes": 397.19999999999998863131622783839702606201171875,
    "points_in_zone": 101,
    "first_point": {
        "ts": "2026-09-08T06:50:44+00:00",
        "lat": 46.6514499999999969759301166050136089324951171875,
        "lon": 142.645929999999992787707014940679073333740234375
    },
    "last_point": {
        "ts": "2026-09-08T13:27:54+00:00",
        "lat": 46.65261170000000134905349113978445529937744140625,
        "lon": 142.664271700000000464569893665611743927001953125
    }
}

Methodology: 2026.01.18

Zone Dwell Sakhalin South Approach Sep 8, 2026 06:01 UTC 80.0%
  • Zone: Sakhalin South Approach
  • Duration: 6h 37m
  • Data Points: 101 AIS positions
  • Period: 2026-09-08T06:50:44+00:00 to 2026-09-08T13:27:54+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "dwell_minutes": 397.19999999999998863131622783839702606201171875,
    "points_in_zone": 101,
    "first_point": {
        "ts": "2026-09-08T06:50:44+00:00",
        "lat": 46.6514499999999969759301166050136089324951171875,
        "lon": 142.645929999999992787707014940679073333740234375
    },
    "last_point": {
        "ts": "2026-09-08T13:27:54+00:00",
        "lat": 46.65261170000000134905349113978445529937744140625,
        "lon": 142.664271700000000464569893665611743927001953125
    }
}

Methodology: 2026.01.18

Sts🛰️✗ Sakhalin South Approach Sep 8, 2026 05:03 UTC 95/100
Vessel A: Omsk (OMSK) Russia
Vessel B: Okean (OKEAN) RUSSIA
  • Minimum Distance: 5 meters
  • Average Distance: 9 meters
  • Duration: 3h 6m
  • Period: 2026-09-08T05:03:45+00:00 to 2026-09-08T08:09:46+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Sakhalin South Approach

Confidence Analysis

Score: 95/100

High-confidence STS candidate. Two tankers (OMSK and OKEAN) maintained close proximity (min 5m, avg 9m) for 186 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Sakhalin South Approach, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness25/25Min distance 5m, avg 9m
Duration25/25Duration 186 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±2m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Sakhalin South Approach

🛰️ Satellite Corroboration

✗ SAR Not Available

No satellite imagery for this time/location

No Sentinel-1 scenes covering AOI and time window

Searched: 2026-09-08T11:45:19.046225+00:00

Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273371330,
        "imo": 9418509,
        "name": "OMSK",
        "flag": "Russia"
    },
    "vessel_b": {
        "mmsi": 273378580,
        "imo": 9142916,
        "name": "OKEAN",
        "flag": "RUSSIA"
    },
    "min_distance_m": 4.9000000000000003552713678800500929355621337890625,
    "avg_distance_m": 9.300000000000000710542735760100185871124267578125,
    "distance_consistency_m": 1.8000000000000000444089209850062616169452667236328125,
    "duration_minutes": 186,
    "overlap_duration_s": 11161,
    "speed_a_avg": 0.0200000000000000004163336342344337026588618755340576171875,
    "speed_a_std": 0.040000000000000000832667268468867405317723751068115234375,
    "speed_b_avg": 0.0200000000000000004163336342344337026588618755340576171875,
    "speed_b_std": 0.040000000000000000832667268468867405317723751068115234375,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.0200000000000000004163336342344337026588618755340576171875,
            "max_sog": 0.1000000000000000055511151231257827021181583404541015625
        },
        "vessel_b": {
            "avg_sog": 0.0200000000000000004163336342344337026588618755340576171875,
            "max_sog": 0.1000000000000000055511151231257827021181583404541015625
        }
    },
    "time_window": {
        "start": "2026-09-08T05:03:45+00:00",
        "end": "2026-09-08T08:09:46+00:00"
    },
    "points_count": {
        "vessel_a": 52,
        "vessel_b": 52
    },
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "score": {
        "value": 95,
        "components": {
            "distance_tightness": {
                "score": 25,
                "max": 25,
                "detail": "Min distance 5m, avg 9m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 186 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b12m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Sakhalin South Approach"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (OMSK and OKEAN) maintained close proximity (min 5m, avg 9m) for 186 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Sakhalin South Approach, a known STS activity area."
    },
    "sar": {
        "status": "not_found",
        "centroid": {
            "lat": 46.65143470000000291975084110163152217864990234375,
            "lon": 142.646060199999993756136973388493061065673828125
        },
        "time_window": {
            "start_ts": "2026-09-08T05:03:45+00:00",
            "end_ts": "2026-09-08T08:09:46+00:00"
        },
        "searched_at": "2026-09-08T11:45:19.046225+00:00",
        "notes": "No Sentinel-1 scenes covering AOI and time window"
    }
}

Methodology: 2026.01.18

Sts🛰️✗ Prigorodnoye/Sakhalin LNG Sep 8, 2026 05:03 UTC 95/100
Vessel A: Omsk (OMSK) Russia
Vessel B: Okean (OKEAN) RUSSIA
  • Minimum Distance: 5 meters
  • Average Distance: 9 meters
  • Duration: 3h 6m
  • Period: 2026-09-08T05:03:45+00:00 to 2026-09-08T08:09:46+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Prigorodnoye/Sakhalin LNG

Confidence Analysis

Score: 95/100

High-confidence STS candidate. Two tankers (OMSK and OKEAN) maintained close proximity (min 5m, avg 9m) for 186 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Prigorodnoye/Sakhalin LNG, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness25/25Min distance 5m, avg 9m
Duration25/25Duration 186 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±2m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Prigorodnoye/Sakhalin LNG

🛰️ Satellite Corroboration

✗ SAR Not Available

No satellite imagery for this time/location

No Sentinel-1 scenes covering AOI and time window

Searched: 2026-09-08T11:45:15.341547+00:00

Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273371330,
        "imo": 9418509,
        "name": "OMSK",
        "flag": "Russia"
    },
    "vessel_b": {
        "mmsi": 273378580,
        "imo": 9142916,
        "name": "OKEAN",
        "flag": "RUSSIA"
    },
    "min_distance_m": 4.9000000000000003552713678800500929355621337890625,
    "avg_distance_m": 9.300000000000000710542735760100185871124267578125,
    "distance_consistency_m": 1.8000000000000000444089209850062616169452667236328125,
    "duration_minutes": 186,
    "overlap_duration_s": 11161,
    "speed_a_avg": 0.0200000000000000004163336342344337026588618755340576171875,
    "speed_a_std": 0.040000000000000000832667268468867405317723751068115234375,
    "speed_b_avg": 0.0200000000000000004163336342344337026588618755340576171875,
    "speed_b_std": 0.040000000000000000832667268468867405317723751068115234375,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.0200000000000000004163336342344337026588618755340576171875,
            "max_sog": 0.1000000000000000055511151231257827021181583404541015625
        },
        "vessel_b": {
            "avg_sog": 0.0200000000000000004163336342344337026588618755340576171875,
            "max_sog": 0.1000000000000000055511151231257827021181583404541015625
        }
    },
    "time_window": {
        "start": "2026-09-08T05:03:45+00:00",
        "end": "2026-09-08T08:09:46+00:00"
    },
    "points_count": {
        "vessel_a": 52,
        "vessel_b": 52
    },
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "score": {
        "value": 95,
        "components": {
            "distance_tightness": {
                "score": 25,
                "max": 25,
                "detail": "Min distance 5m, avg 9m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 186 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b12m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Prigorodnoye\/Sakhalin LNG"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (OMSK and OKEAN) maintained close proximity (min 5m, avg 9m) for 186 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Prigorodnoye\/Sakhalin LNG, a known STS activity area."
    },
    "sar": {
        "status": "not_found",
        "centroid": {
            "lat": 46.65143470000000291975084110163152217864990234375,
            "lon": 142.646060199999993756136973388493061065673828125
        },
        "time_window": {
            "start_ts": "2026-09-08T05:03:45+00:00",
            "end_ts": "2026-09-08T08:09:46+00:00"
        },
        "searched_at": "2026-09-08T11:45:15.341547+00:00",
        "notes": "No Sentinel-1 scenes covering AOI and time window"
    }
}

Methodology: 2026.01.18

Loiter Sakhalin South Approach Sep 8, 2026 05:01 UTC 75.0%
  • Duration: 3h 13m
  • Radius: 1,011 meters
  • Data Points: 61 AIS positions
  • Centroid: 46.6515, 142.6465
  • Zone: Sakhalin South Approach
Show Raw Evidence JSON
{
    "radius_m": 1011.200000000000045474735088646411895751953125,
    "duration_minutes": 193.599999999999994315658113919198513031005859375,
    "points": 61,
    "centroid": {
        "lat": 46.6515141770491794659392326138913631439208984375,
        "lon": 142.646462847540959728576126508414745330810546875
    },
    "bbox": {
        "min_lat": 46.64928499999999900182956480421125888824462890625,
        "min_lon": 142.645728300000001809166860766708850860595703125,
        "max_lat": 46.65595830000000177051333594135940074920654296875,
        "max_lon": 142.657990000000012287273420952260494232177734375
    },
    "zone_id": "russia_sakhalin_south"
}

Methodology: 2026.01.18

Loiter Prigorodnoye/Sakhalin LNG Sep 8, 2026 05:01 UTC 75.0%
  • Duration: 3h 13m
  • Radius: 1,011 meters
  • Data Points: 61 AIS positions
  • Centroid: 46.6515, 142.6465
  • Zone: Prigorodnoye/Sakhalin LNG
Show Raw Evidence JSON
{
    "radius_m": 1011.200000000000045474735088646411895751953125,
    "duration_minutes": 193.599999999999994315658113919198513031005859375,
    "points": 61,
    "centroid": {
        "lat": 46.6515141770491794659392326138913631439208984375,
        "lon": 142.646462847540959728576126508414745330810546875
    },
    "bbox": {
        "min_lat": 46.64928499999999900182956480421125888824462890625,
        "min_lon": 142.645728300000001809166860766708850860595703125,
        "max_lat": 46.65595830000000177051333594135940074920654296875,
        "max_lon": 142.657990000000012287273420952260494232177734375
    },
    "zone_id": "russia_prigorodnoye"
}

Methodology: 2026.01.18

Zone Dwell Sakhalin South Approach Sep 8, 2026 05:01 UTC 80.0%
  • Zone: Sakhalin South Approach
  • Duration: 6h 37m
  • Data Points: 103 AIS positions
  • Period: 2026-09-08T05:51:13+00:00 to 2026-09-08T12:28:25+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "dwell_minutes": 397.19999999999998863131622783839702606201171875,
    "points_in_zone": 103,
    "first_point": {
        "ts": "2026-09-08T05:51:13+00:00",
        "lat": 46.6514533000000000129148247651755809783935546875,
        "lon": 142.646015000000005557012627832591533660888671875
    },
    "last_point": {
        "ts": "2026-09-08T12:28:25+00:00",
        "lat": 46.6530733000000026322595658712089061737060546875,
        "lon": 142.66474329999999781648511998355388641357421875
    }
}

Methodology: 2026.01.18

Zone Dwell Prigorodnoye/Sakhalin LNG Sep 8, 2026 05:01 UTC 80.0%
  • Zone: Prigorodnoye/Sakhalin LNG
  • Duration: 6h 37m
  • Data Points: 103 AIS positions
  • Period: 2026-09-08T05:51:13+00:00 to 2026-09-08T12:28:25+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "dwell_minutes": 397.19999999999998863131622783839702606201171875,
    "points_in_zone": 103,
    "first_point": {
        "ts": "2026-09-08T05:51:13+00:00",
        "lat": 46.6514533000000000129148247651755809783935546875,
        "lon": 142.646015000000005557012627832591533660888671875
    },
    "last_point": {
        "ts": "2026-09-08T12:28:25+00:00",
        "lat": 46.6530733000000026322595658712089061737060546875,
        "lon": 142.66474329999999781648511998355388641357421875
    }
}

Methodology: 2026.01.18

Sts🛰️✗ Sakhalin South Approach Sep 8, 2026 04:03 UTC 95/100
Vessel A: Omsk (OMSK) Russia
Vessel B: Okean (OKEAN) RUSSIA
  • Minimum Distance: 5 meters
  • Average Distance: 9 meters
  • Duration: 4h 6m
  • Period: 2026-09-08T04:03:45+00:00 to 2026-09-08T08:09:46+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Sakhalin South Approach

Confidence Analysis

Score: 95/100

High-confidence STS candidate. Two tankers (OMSK and OKEAN) maintained close proximity (min 5m, avg 9m) for 246 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Sakhalin South Approach, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness25/25Min distance 5m, avg 9m
Duration25/25Duration 246 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±2m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Sakhalin South Approach

🛰️ Satellite Corroboration

✗ SAR Not Available

No satellite imagery for this time/location

No Sentinel-1 scenes covering AOI and time window

Searched: 2026-09-08T11:00:01.691741+00:00

Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273371330,
        "imo": 9418509,
        "name": "OMSK",
        "flag": "Russia"
    },
    "vessel_b": {
        "mmsi": 273378580,
        "imo": 9142916,
        "name": "OKEAN",
        "flag": "RUSSIA"
    },
    "min_distance_m": 4.9000000000000003552713678800500929355621337890625,
    "avg_distance_m": 9.199999999999999289457264239899814128875732421875,
    "distance_consistency_m": 1.8000000000000000444089209850062616169452667236328125,
    "duration_minutes": 246,
    "overlap_duration_s": 14761,
    "speed_a_avg": 0.0200000000000000004163336342344337026588618755340576171875,
    "speed_a_std": 0.040000000000000000832667268468867405317723751068115234375,
    "speed_b_avg": 0.0200000000000000004163336342344337026588618755340576171875,
    "speed_b_std": 0.040000000000000000832667268468867405317723751068115234375,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.0200000000000000004163336342344337026588618755340576171875,
            "max_sog": 0.1000000000000000055511151231257827021181583404541015625
        },
        "vessel_b": {
            "avg_sog": 0.0200000000000000004163336342344337026588618755340576171875,
            "max_sog": 0.1000000000000000055511151231257827021181583404541015625
        }
    },
    "time_window": {
        "start": "2026-09-08T04:03:45+00:00",
        "end": "2026-09-08T08:09:46+00:00"
    },
    "points_count": {
        "vessel_a": 68,
        "vessel_b": 68
    },
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "score": {
        "value": 95,
        "components": {
            "distance_tightness": {
                "score": 25,
                "max": 25,
                "detail": "Min distance 5m, avg 9m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 246 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b12m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Sakhalin South Approach"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (OMSK and OKEAN) maintained close proximity (min 5m, avg 9m) for 246 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Sakhalin South Approach, a known STS activity area."
    },
    "sar": {
        "status": "not_found",
        "centroid": {
            "lat": 46.65139210000000247191564994864165782928466796875,
            "lon": 142.645992000000006783011485822498798370361328125
        },
        "time_window": {
            "start_ts": "2026-09-08T04:03:45+00:00",
            "end_ts": "2026-09-08T08:09:46+00:00"
        },
        "searched_at": "2026-09-08T11:00:01.691741+00:00",
        "notes": "No Sentinel-1 scenes covering AOI and time window"
    }
}

Methodology: 2026.01.18

Sts🛰️✗ Prigorodnoye/Sakhalin LNG Sep 8, 2026 04:03 UTC 95/100
Vessel A: Omsk (OMSK) Russia
Vessel B: Okean (OKEAN) RUSSIA
  • Minimum Distance: 5 meters
  • Average Distance: 9 meters
  • Duration: 4h 6m
  • Period: 2026-09-08T04:03:45+00:00 to 2026-09-08T08:09:46+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Prigorodnoye/Sakhalin LNG

Confidence Analysis

Score: 95/100

High-confidence STS candidate. Two tankers (OMSK and OKEAN) maintained close proximity (min 5m, avg 9m) for 246 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Prigorodnoye/Sakhalin LNG, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness25/25Min distance 5m, avg 9m
Duration25/25Duration 246 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±2m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Prigorodnoye/Sakhalin LNG

🛰️ Satellite Corroboration

✗ SAR Not Available

No satellite imagery for this time/location

No Sentinel-1 scenes covering AOI and time window

Searched: 2026-09-08T10:45:12.021553+00:00

Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273371330,
        "imo": 9418509,
        "name": "OMSK",
        "flag": "Russia"
    },
    "vessel_b": {
        "mmsi": 273378580,
        "imo": 9142916,
        "name": "OKEAN",
        "flag": "RUSSIA"
    },
    "min_distance_m": 4.9000000000000003552713678800500929355621337890625,
    "avg_distance_m": 9.199999999999999289457264239899814128875732421875,
    "distance_consistency_m": 1.8000000000000000444089209850062616169452667236328125,
    "duration_minutes": 246,
    "overlap_duration_s": 14761,
    "speed_a_avg": 0.0200000000000000004163336342344337026588618755340576171875,
    "speed_a_std": 0.040000000000000000832667268468867405317723751068115234375,
    "speed_b_avg": 0.0200000000000000004163336342344337026588618755340576171875,
    "speed_b_std": 0.040000000000000000832667268468867405317723751068115234375,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.0200000000000000004163336342344337026588618755340576171875,
            "max_sog": 0.1000000000000000055511151231257827021181583404541015625
        },
        "vessel_b": {
            "avg_sog": 0.0200000000000000004163336342344337026588618755340576171875,
            "max_sog": 0.1000000000000000055511151231257827021181583404541015625
        }
    },
    "time_window": {
        "start": "2026-09-08T04:03:45+00:00",
        "end": "2026-09-08T08:09:46+00:00"
    },
    "points_count": {
        "vessel_a": 68,
        "vessel_b": 68
    },
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "score": {
        "value": 95,
        "components": {
            "distance_tightness": {
                "score": 25,
                "max": 25,
                "detail": "Min distance 5m, avg 9m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 246 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b12m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Prigorodnoye\/Sakhalin LNG"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (OMSK and OKEAN) maintained close proximity (min 5m, avg 9m) for 246 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Prigorodnoye\/Sakhalin LNG, a known STS activity area."
    },
    "sar": {
        "status": "not_found",
        "centroid": {
            "lat": 46.65139210000000247191564994864165782928466796875,
            "lon": 142.645992000000006783011485822498798370361328125
        },
        "time_window": {
            "start_ts": "2026-09-08T04:03:45+00:00",
            "end_ts": "2026-09-08T08:09:46+00:00"
        },
        "searched_at": "2026-09-08T10:45:12.021553+00:00",
        "notes": "No Sentinel-1 scenes covering AOI and time window"
    }
}

Methodology: 2026.01.18

Loiter Sakhalin South Approach Sep 8, 2026 04:02 UTC 75.0%
  • Duration: 4h 12m
  • Radius: 1,027 meters
  • Data Points: 80 AIS positions
  • Centroid: 46.6515, 142.6463
  • Zone: Sakhalin South Approach
Show Raw Evidence JSON
{
    "radius_m": 1026.799999999999954525264911353588104248046875,
    "duration_minutes": 252.400000000000005684341886080801486968994140625,
    "points": 80,
    "centroid": {
        "lat": 46.65145091499999097095496836118400096893310546875,
        "lon": 142.64628111124994802594301290810108184814453125
    },
    "bbox": {
        "min_lat": 46.64928499999999900182956480421125888824462890625,
        "min_lon": 142.64560000000000172803993336856365203857421875,
        "max_lat": 46.65595830000000177051333594135940074920654296875,
        "max_lon": 142.657990000000012287273420952260494232177734375
    },
    "zone_id": "russia_sakhalin_south"
}

Methodology: 2026.01.18

Loiter Prigorodnoye/Sakhalin LNG Sep 8, 2026 04:02 UTC 75.0%
  • Duration: 4h 12m
  • Radius: 1,027 meters
  • Data Points: 80 AIS positions
  • Centroid: 46.6515, 142.6463
  • Zone: Prigorodnoye/Sakhalin LNG
Show Raw Evidence JSON
{
    "radius_m": 1026.799999999999954525264911353588104248046875,
    "duration_minutes": 252.400000000000005684341886080801486968994140625,
    "points": 80,
    "centroid": {
        "lat": 46.65145091499999097095496836118400096893310546875,
        "lon": 142.64628111124994802594301290810108184814453125
    },
    "bbox": {
        "min_lat": 46.64928499999999900182956480421125888824462890625,
        "min_lon": 142.64560000000000172803993336856365203857421875,
        "max_lat": 46.65595830000000177051333594135940074920654296875,
        "max_lon": 142.657990000000012287273420952260494232177734375
    },
    "zone_id": "russia_prigorodnoye"
}

Methodology: 2026.01.18

Zone Dwell Sakhalin South Approach Sep 8, 2026 04:02 UTC 80.0%
  • Zone: Sakhalin South Approach
  • Duration: 6h 38m
  • Data Points: 110 AIS positions
  • Period: 2026-09-08T04:51:44+00:00 to 2026-09-08T11:30:02+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "dwell_minutes": 398.30000000000001136868377216160297393798828125,
    "points_in_zone": 110,
    "first_point": {
        "ts": "2026-09-08T04:51:44+00:00",
        "lat": 46.6512732999999997218765201978385448455810546875,
        "lon": 142.645791699999989532443578355014324188232421875
    },
    "last_point": {
        "ts": "2026-09-08T11:30:02+00:00",
        "lat": 46.6529232999999976527760736644268035888671875,
        "lon": 142.664728300000007266135071404278278350830078125
    }
}

Methodology: 2026.01.18

Zone Dwell Prigorodnoye/Sakhalin LNG Sep 8, 2026 04:02 UTC 80.0%
  • Zone: Prigorodnoye/Sakhalin LNG
  • Duration: 6h 38m
  • Data Points: 110 AIS positions
  • Period: 2026-09-08T04:51:44+00:00 to 2026-09-08T11:30:02+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "dwell_minutes": 398.30000000000001136868377216160297393798828125,
    "points_in_zone": 110,
    "first_point": {
        "ts": "2026-09-08T04:51:44+00:00",
        "lat": 46.6512732999999997218765201978385448455810546875,
        "lon": 142.645791699999989532443578355014324188232421875
    },
    "last_point": {
        "ts": "2026-09-08T11:30:02+00:00",
        "lat": 46.6529232999999976527760736644268035888671875,
        "lon": 142.664728300000007266135071404278278350830078125
    }
}

Methodology: 2026.01.18

Loiter Sakhalin South Approach Sep 8, 2026 03:01 UTC 75.0%
  • Duration: 5h 13m
  • Radius: 1,039 meters
  • Data Points: 100 AIS positions
  • Centroid: 46.6514, 142.6461
  • Zone: Sakhalin South Approach
Show Raw Evidence JSON
{
    "radius_m": 1038.5,
    "duration_minutes": 313.3999999999999772626324556767940521240234375,
    "points": 100,
    "centroid": {
        "lat": 46.65140758199999027056037448346614837646484375,
        "lon": 142.646141021999966369548928923904895782470703125
    },
    "bbox": {
        "min_lat": 46.64928499999999900182956480421125888824462890625,
        "min_lon": 142.645495000000011032170732505619525909423828125,
        "max_lat": 46.65595830000000177051333594135940074920654296875,
        "max_lon": 142.657990000000012287273420952260494232177734375
    },
    "zone_id": "russia_sakhalin_south"
}

Methodology: 2026.01.18

Loiter Prigorodnoye/Sakhalin LNG Sep 8, 2026 03:01 UTC 75.0%
  • Duration: 5h 13m
  • Radius: 1,039 meters
  • Data Points: 100 AIS positions
  • Centroid: 46.6514, 142.6461
  • Zone: Prigorodnoye/Sakhalin LNG
Show Raw Evidence JSON
{
    "radius_m": 1038.5,
    "duration_minutes": 313.3999999999999772626324556767940521240234375,
    "points": 100,
    "centroid": {
        "lat": 46.65140758199999027056037448346614837646484375,
        "lon": 142.646141021999966369548928923904895782470703125
    },
    "bbox": {
        "min_lat": 46.64928499999999900182956480421125888824462890625,
        "min_lon": 142.645495000000011032170732505619525909423828125,
        "max_lat": 46.65595830000000177051333594135940074920654296875,
        "max_lon": 142.657990000000012287273420952260494232177734375
    },
    "zone_id": "russia_prigorodnoye"
}

Methodology: 2026.01.18

Zone Dwell Sakhalin South Approach Sep 8, 2026 03:01 UTC 80.0%
  • Zone: Sakhalin South Approach
  • Duration: 6h 39m
  • Data Points: 121 AIS positions
  • Period: 2026-09-08T03:50:04+00:00 to 2026-09-08T10:30:01+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "dwell_minutes": 399.8999999999999772626324556767940521240234375,
    "points_in_zone": 121,
    "first_point": {
        "ts": "2026-09-08T03:50:04+00:00",
        "lat": 46.6512249999999966121322358958423137664794921875,
        "lon": 142.64555669999998599450918845832347869873046875
    },
    "last_point": {
        "ts": "2026-09-08T10:30:01+00:00",
        "lat": 46.65416499999999899728209129534661769866943359375,
        "lon": 142.66415169999999079664121381938457489013671875
    }
}

Methodology: 2026.01.18

Zone Dwell Prigorodnoye/Sakhalin LNG Sep 8, 2026 03:01 UTC 80.0%
  • Zone: Prigorodnoye/Sakhalin LNG
  • Duration: 6h 39m
  • Data Points: 121 AIS positions
  • Period: 2026-09-08T03:50:04+00:00 to 2026-09-08T10:30:01+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "dwell_minutes": 399.8999999999999772626324556767940521240234375,
    "points_in_zone": 121,
    "first_point": {
        "ts": "2026-09-08T03:50:04+00:00",
        "lat": 46.6512249999999966121322358958423137664794921875,
        "lon": 142.64555669999998599450918845832347869873046875
    },
    "last_point": {
        "ts": "2026-09-08T10:30:01+00:00",
        "lat": 46.65416499999999899728209129534661769866943359375,
        "lon": 142.66415169999999079664121381938457489013671875
    }
}

Methodology: 2026.01.18

Source snapshot

SanctionerAs ofEntity ID
🇬🇧 UK2025-09-299142916

We mirror official lists; always verify at the source.

Sanctioned on the same day

  • AGATE · IMO 9310707 🇪🇺 EU🇬🇧 UK
  • AKTROS · IMO 9257814 🇪🇺 EU🇬🇧 UK
  • ANGELIC BO · IMO 9237228 🇦🇺 AU🇪🇺 EU🇳🇿 NZ🇬🇧 UK
  • AQUA LIVE · IMO 9282792 🇦🇺 AU🇪🇺 EU🇬🇧 UK
  • ARABESCA · IMO 9288734 🇦🇺 AU🇪🇺 EU🇬🇧 UK
  • ARLAN · IMO 9227443 🇦🇺 AU🇪🇺 EU🇬🇧 UK
  • BARENTS · IMO 9384447 🇦🇺 AU🇪🇺 EU🇳🇿 NZ🇬🇧 UK
  • BEAST · IMO 9290921 🇦🇺 AU🇪🇺 EU🇬🇧 UK