CL MARGARET MITCHELL

IMO 9943372

Vessel information

Vessel Name CL MARGARET MITCHELL
IMO Number 9943372
MMSI 636022165
Vessel Type Tanker
Flag 🇱🇷 LIBERIA
Call Sign 5LHM2
Length 183 m
Beam 32 m

Detected Events (100)

Zone Dwell Norwegian Sea Surveillance Zone
Oct 28, 2026 09:09 UTC 80.0% ▼
  • Zone: Norwegian Sea Surveillance Zone
  • Duration: 1h 3m
  • Data Points: 9 AIS positions
  • Period: 2026-10-28T09:09:58+00:00 to 2026-10-28T10:13:48+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_108",
    "zone_name": "Norwegian Sea Surveillance Zone",
    "dwell_minutes": 63.7999999999999971578290569595992565155029296875,
    "points_in_zone": 9,
    "first_point": {
        "ts": "2026-10-28T09:09:58+00:00",
        "lat": 49.12140000000000128466126625426113605499267578125,
        "lon": -4.6614532999999997997520040371455252170562744140625
    },
    "last_point": {
        "ts": "2026-10-28T10:13:48+00:00",
        "lat": 49.23514329999999716847014497034251689910888671875,
        "lon": -4.4000450000000004280309440218843519687652587890625
    }
}
Methodology: 2026.01.18
Zone Dwell Norwegian Sea Surveillance Zone
Oct 28, 2026 08:03 UTC 80.0% ▼
  • Zone: Norwegian Sea Surveillance Zone
  • Duration: 2h 10m
  • Data Points: 20 AIS positions
  • Period: 2026-10-28T08:03:39+00:00 to 2026-10-28T10:13:48+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_108",
    "zone_name": "Norwegian Sea Surveillance Zone",
    "dwell_minutes": 130.19999999999998863131622783839702606201171875,
    "points_in_zone": 20,
    "first_point": {
        "ts": "2026-10-28T08:03:39+00:00",
        "lat": 49.0084650000000010550138540565967559814453125,
        "lon": -4.9533167000000002389015207882039248943328857421875
    },
    "last_point": {
        "ts": "2026-10-28T10:13:48+00:00",
        "lat": 49.23514329999999716847014497034251689910888671875,
        "lon": -4.4000450000000004280309440218843519687652587890625
    }
}
Methodology: 2026.01.18
Zone Dwell Norwegian Sea Surveillance Zone
Oct 28, 2026 07:49 UTC 80.0% ▼
  • Zone: Norwegian Sea Surveillance Zone
  • Duration: 2h 24m
  • Data Points: 21 AIS positions
  • Period: 2026-10-28T07:49:09+00:00 to 2026-10-28T10:13:48+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_108",
    "zone_name": "Norwegian Sea Surveillance Zone",
    "dwell_minutes": 144.69999999999998863131622783839702606201171875,
    "points_in_zone": 21,
    "first_point": {
        "ts": "2026-10-28T07:49:09+00:00",
        "lat": 48.9863550000000032014213502407073974609375,
        "lon": -5.01489829999999958687340040341950953006744384765625
    },
    "last_point": {
        "ts": "2026-10-28T10:13:48+00:00",
        "lat": 49.23514329999999716847014497034251689910888671875,
        "lon": -4.4000450000000004280309440218843519687652587890625
    }
}
Methodology: 2026.01.18
Zone Dwell North Sea Monitoring Zone
Oct 25, 2026 20:06 UTC 80.0% ▼
  • Zone: North Sea Monitoring Zone
  • Duration: 1h 59m
  • Data Points: 29 AIS positions
  • Period: 2026-10-25T20:06:27+00:00 to 2026-10-25T22:06:07+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_120",
    "zone_name": "North Sea Monitoring Zone",
    "dwell_minutes": 119.7000000000000028421709430404007434844970703125,
    "points_in_zone": 29,
    "first_point": {
        "ts": "2026-10-25T20:06:27+00:00",
        "lat": 37.9488582999999977118932292796671390533447265625,
        "lon": -9.887969999999999259898686432279646396636962890625
    },
    "last_point": {
        "ts": "2026-10-25T22:06:07+00:00",
        "lat": 38.32838670000000291793185169808566570281982421875,
        "lon": -9.8545083000000008865981726557947695255279541015625
    }
}
Methodology: 2026.01.18
Zone Dwell Northern Baltic Surveillance Zone
Oct 25, 2026 19:00 UTC 80.0% ▼
  • Zone: Northern Baltic Surveillance Zone
  • Duration: 1h 22m
  • Data Points: 31 AIS positions
  • Period: 2026-10-25T19:00:16+00:00 to 2026-10-25T20:22:36+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_097",
    "zone_name": "Northern Baltic Surveillance Zone",
    "dwell_minutes": 82.2999999999999971578290569595992565155029296875,
    "points_in_zone": 31,
    "first_point": {
        "ts": "2026-10-25T19:00:16+00:00",
        "lat": 37.73276829999999648634911864064633846282958984375,
        "lon": -9.89249170000000077607182902283966541290283203125
    },
    "last_point": {
        "ts": "2026-10-25T20:22:36+00:00",
        "lat": 37.99946829999999664551069145090878009796142578125,
        "lon": -9.8848000000000002529532139305956661701202392578125
    }
}
Methodology: 2026.01.18
Zone Dwell North Sea Monitoring Zone
Oct 25, 2026 19:00 UTC 80.0% ▼
  • Zone: North Sea Monitoring Zone
  • Duration: 3h 5m
  • Data Points: 53 AIS positions
  • Period: 2026-10-25T19:00:16+00:00 to 2026-10-25T22:06:07+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_120",
    "zone_name": "North Sea Monitoring Zone",
    "dwell_minutes": 185.80000000000001136868377216160297393798828125,
    "points_in_zone": 53,
    "first_point": {
        "ts": "2026-10-25T19:00:16+00:00",
        "lat": 37.73276829999999648634911864064633846282958984375,
        "lon": -9.89249170000000077607182902283966541290283203125
    },
    "last_point": {
        "ts": "2026-10-25T22:06:07+00:00",
        "lat": 38.32838670000000291793185169808566570281982421875,
        "lon": -9.8545083000000008865981726557947695255279541015625
    }
}
Methodology: 2026.01.18
Zone Dwell North Sea Monitoring Zone
Oct 25, 2026 18:57 UTC 80.0% ▼
  • Zone: North Sea Monitoring Zone
  • Duration: 3h 8m
  • Data Points: 55 AIS positions
  • Period: 2026-10-25T18:57:25+00:00 to 2026-10-25T22:06:07+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_120",
    "zone_name": "North Sea Monitoring Zone",
    "dwell_minutes": 188.69999999999998863131622783839702606201171875,
    "points_in_zone": 55,
    "first_point": {
        "ts": "2026-10-25T18:57:25+00:00",
        "lat": 37.72324669999999713354554842226207256317138671875,
        "lon": -9.8934332999999998747853169334121048450469970703125
    },
    "last_point": {
        "ts": "2026-10-25T22:06:07+00:00",
        "lat": 38.32838670000000291793185169808566570281982421875,
        "lon": -9.8545083000000008865981726557947695255279541015625
    }
}
Methodology: 2026.01.18
Zone Dwell Northern Baltic Surveillance Zone
Oct 25, 2026 18:05 UTC 80.0% ▼
  • Zone: Northern Baltic Surveillance Zone
  • Duration: 2h 16m
  • Data Points: 36 AIS positions
  • Period: 2026-10-25T18:05:47+00:00 to 2026-10-25T20:22:36+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_097",
    "zone_name": "Northern Baltic Surveillance Zone",
    "dwell_minutes": 136.80000000000001136868377216160297393798828125,
    "points_in_zone": 36,
    "first_point": {
        "ts": "2026-10-25T18:05:47+00:00",
        "lat": 37.5514849999999995588950696401298046112060546875,
        "lon": -9.9071133000000006774143912480212748050689697265625
    },
    "last_point": {
        "ts": "2026-10-25T20:22:36+00:00",
        "lat": 37.99946829999999664551069145090878009796142578125,
        "lon": -9.8848000000000002529532139305956661701202392578125
    }
}
Methodology: 2026.01.18
Zone Dwell Northern Baltic Surveillance Zone
Oct 25, 2026 17:15 UTC 80.0% ▼
  • Zone: Northern Baltic Surveillance Zone
  • Duration: 3h 7m
  • Data Points: 53 AIS positions
  • Period: 2026-10-25T17:15:06+00:00 to 2026-10-25T20:22:36+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_097",
    "zone_name": "Northern Baltic Surveillance Zone",
    "dwell_minutes": 187.5,
    "points_in_zone": 53,
    "first_point": {
        "ts": "2026-10-25T17:15:06+00:00",
        "lat": 37.38310830000000350992195308208465576171875,
        "lon": -9.9284616999999997233317117206752300262451171875
    },
    "last_point": {
        "ts": "2026-10-25T20:22:36+00:00",
        "lat": 37.99946829999999664551069145090878009796142578125,
        "lon": -9.8848000000000002529532139305956661701202392578125
    }
}
Methodology: 2026.01.18
Zone Dwell Northern Baltic Surveillance Zone
Oct 25, 2026 16:50 UTC 80.0% ▼
  • Zone: Northern Baltic Surveillance Zone
  • Duration: 3h 31m
  • Data Points: 54 AIS positions
  • Period: 2026-10-25T16:50:46+00:00 to 2026-10-25T20:22:36+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_097",
    "zone_name": "Northern Baltic Surveillance Zone",
    "dwell_minutes": 211.80000000000001136868377216160297393798828125,
    "points_in_zone": 54,
    "first_point": {
        "ts": "2026-10-25T16:50:46+00:00",
        "lat": 37.29972000000000065256244852207601070404052734375,
        "lon": -9.9372883000000005182528184377588331699371337890625
    },
    "last_point": {
        "ts": "2026-10-25T20:22:36+00:00",
        "lat": 37.99946829999999664551069145090878009796142578125,
        "lon": -9.8848000000000002529532139305956661701202392578125
    }
}
Methodology: 2026.01.18
Zone Dwell Unknown Maritime Surveillance Zone
Oct 25, 2026 08:00 UTC 80.0% ▼
  • Zone: Unknown Maritime Surveillance Zone
  • Duration: 1h 32m
  • Data Points: 40 AIS positions
  • Period: 2026-10-25T08:00:17+00:00 to 2026-10-25T09:33:07+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_134",
    "zone_name": "Unknown Maritime Surveillance Zone",
    "dwell_minutes": 92.7999999999999971578290569595992565155029296875,
    "points_in_zone": 40,
    "first_point": {
        "ts": "2026-10-25T08:00:17+00:00",
        "lat": 36.1801150000000006912159733474254608154296875,
        "lon": -8.696419999999999816964191268198192119598388671875
    },
    "last_point": {
        "ts": "2026-10-25T09:33:07+00:00",
        "lat": 36.1749750000000034333424991928040981292724609375,
        "lon": -9.104376699999999544843376497738063335418701171875
    }
}
Methodology: 2026.01.18
Zone Dwell Unknown Maritime Surveillance Zone
Oct 25, 2026 07:00 UTC 80.0% ▼
  • Zone: Unknown Maritime Surveillance Zone
  • Duration: 2h 32m
  • Data Points: 67 AIS positions
  • Period: 2026-10-25T07:00:37+00:00 to 2026-10-25T09:33:07+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_134",
    "zone_name": "Unknown Maritime Surveillance Zone",
    "dwell_minutes": 152.5,
    "points_in_zone": 67,
    "first_point": {
        "ts": "2026-10-25T07:00:37+00:00",
        "lat": 36.192468300000001590888132341206073760986328125,
        "lon": -8.4322599999999994224708643741905689239501953125
    },
    "last_point": {
        "ts": "2026-10-25T09:33:07+00:00",
        "lat": 36.1749750000000034333424991928040981292724609375,
        "lon": -9.104376699999999544843376497738063335418701171875
    }
}
Methodology: 2026.01.18
Zone Dwell Unknown Maritime Surveillance Zone
Oct 25, 2026 06:00 UTC 80.0% ▼
  • Zone: Unknown Maritime Surveillance Zone
  • Duration: 3h 32m
  • Data Points: 92 AIS positions
  • Period: 2026-10-25T06:00:16+00:00 to 2026-10-25T09:33:07+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_134",
    "zone_name": "Unknown Maritime Surveillance Zone",
    "dwell_minutes": 212.80000000000001136868377216160297393798828125,
    "points_in_zone": 92,
    "first_point": {
        "ts": "2026-10-25T06:00:16+00:00",
        "lat": 36.20006670000000070785972638987004756927490234375,
        "lon": -8.1691383000000001857188181020319461822509765625
    },
    "last_point": {
        "ts": "2026-10-25T09:33:07+00:00",
        "lat": 36.1749750000000034333424991928040981292724609375,
        "lon": -9.104376699999999544843376497738063335418701171875
    }
}
Methodology: 2026.01.18
Zone Dwell Unknown Maritime Surveillance Zone
Oct 25, 2026 05:55 UTC 80.0% ▼
  • Zone: Unknown Maritime Surveillance Zone
  • Duration: 3h 37m
  • Data Points: 97 AIS positions
  • Period: 2026-10-25T05:55:16+00:00 to 2026-10-25T09:33:07+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_134",
    "zone_name": "Unknown Maritime Surveillance Zone",
    "dwell_minutes": 217.80000000000001136868377216160297393798828125,
    "points_in_zone": 97,
    "first_point": {
        "ts": "2026-10-25T05:55:16+00:00",
        "lat": 36.20058499999999668261807528324425220489501953125,
        "lon": -8.1475050000000006633626981056295335292816162109375
    },
    "last_point": {
        "ts": "2026-10-25T09:33:07+00:00",
        "lat": 36.1749750000000034333424991928040981292724609375,
        "lon": -9.104376699999999544843376497738063335418701171875
    }
}
Methodology: 2026.01.18
Zone Dwell Central Atlantic Surveillance Zone
Oct 25, 2026 05:03 UTC 80.0% ▼
  • Zone: Central Atlantic Surveillance Zone
  • Duration: 1h 17m
  • Data Points: 36 AIS positions
  • Period: 2026-10-25T05:03:15+00:00 to 2026-10-25T06:20:45+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_088",
    "zone_name": "Central Atlantic Surveillance Zone",
    "dwell_minutes": 77.5,
    "points_in_zone": 36,
    "first_point": {
        "ts": "2026-10-25T05:03:15+00:00",
        "lat": 36.20780669999999901165210758335888385772705078125,
        "lon": -7.91762500000000013500311979441903531551361083984375
    },
    "last_point": {
        "ts": "2026-10-25T06:20:45+00:00",
        "lat": 36.197963299999997843769961036741733551025390625,
        "lon": -8.2586782999999996945916791446506977081298828125
    }
}
Methodology: 2026.01.18
Zone Dwell Central Atlantic Surveillance Zone
Oct 25, 2026 04:24 UTC 80.0% ▼
  • Zone: Central Atlantic Surveillance Zone
  • Duration: 1h 56m
  • Data Points: 51 AIS positions
  • Period: 2026-10-25T04:24:45+00:00 to 2026-10-25T06:20:45+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_088",
    "zone_name": "Central Atlantic Surveillance Zone",
    "dwell_minutes": 116,
    "points_in_zone": 51,
    "first_point": {
        "ts": "2026-10-25T04:24:45+00:00",
        "lat": 36.212791699999996808401192538440227508544921875,
        "lon": -7.744035000000000223963070311583578586578369140625
    },
    "last_point": {
        "ts": "2026-10-25T06:20:45+00:00",
        "lat": 36.197963299999997843769961036741733551025390625,
        "lon": -8.2586782999999996945916791446506977081298828125
    }
}
Methodology: 2026.01.18
Zone Dwell Southern Öresund Surveillance Zone
Oct 25, 2026 01:24 UTC 80.0% ▼
  • Zone: Southern Öresund Surveillance Zone
  • Duration: 1h 24m
  • Data Points: 9 AIS positions
  • Period: 2026-10-25T01:24:45+00:00 to 2026-10-25T02:48:45+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_003",
    "zone_name": "Southern \u00d6resund Surveillance Zone",
    "dwell_minutes": 84,
    "points_in_zone": 9,
    "first_point": {
        "ts": "2026-10-25T01:24:45+00:00",
        "lat": 36.62400999999999839928932487964630126953125,
        "lon": -7.1753567000000000319914761348627507686614990234375
    },
    "last_point": {
        "ts": "2026-10-25T02:48:45+00:00",
        "lat": 36.366933299999999462670530192553997039794921875,
        "lon": -7.40093829999999996971382643096148967742919921875
    }
}
Methodology: 2026.01.18
Zone Dwell Southern Öresund Surveillance Zone
Oct 25, 2026 00:01 UTC 80.0% ▼
  • Zone: Southern Öresund Surveillance Zone
  • Duration: 2h 47m
  • Data Points: 11 AIS positions
  • Period: 2026-10-25T00:01:05+00:00 to 2026-10-25T02:48:45+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_003",
    "zone_name": "Southern \u00d6resund Surveillance Zone",
    "dwell_minutes": 167.69999999999998863131622783839702606201171875,
    "points_in_zone": 11,
    "first_point": {
        "ts": "2026-10-25T00:01:05+00:00",
        "lat": 36.86826169999999791571099194698035717010498046875,
        "lon": -6.97111329999999984607939040870405733585357666015625
    },
    "last_point": {
        "ts": "2026-10-25T02:48:45+00:00",
        "lat": 36.366933299999999462670530192553997039794921875,
        "lon": -7.40093829999999996971382643096148967742919921875
    }
}
Methodology: 2026.01.18
Zone Dwell Southern Öresund Surveillance Zone
Oct 24, 2026 23:00 UTC 80.0% ▼
  • Zone: Southern Öresund Surveillance Zone
  • Duration: 3h 48m
  • Data Points: 27 AIS positions
  • Period: 2026-10-24T23:00:15+00:00 to 2026-10-25T02:48:45+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_003",
    "zone_name": "Southern \u00d6resund Surveillance Zone",
    "dwell_minutes": 228.5,
    "points_in_zone": 27,
    "first_point": {
        "ts": "2026-10-24T23:00:15+00:00",
        "lat": 37.0247600000000005593392415903508663177490234375,
        "lon": -6.84217000000000030723867894266732037067413330078125
    },
    "last_point": {
        "ts": "2026-10-25T02:48:45+00:00",
        "lat": 36.366933299999999462670530192553997039794921875,
        "lon": -7.40093829999999996971382643096148967742919921875
    }
}
Methodology: 2026.01.18
Zone Dwell Southern Öresund Surveillance Zone
Oct 24, 2026 22:02 UTC 80.0% ▼
  • Zone: Southern Öresund Surveillance Zone
  • Duration: 4h 46m
  • Data Points: 51 AIS positions
  • Period: 2026-10-24T22:02:05+00:00 to 2026-10-25T02:48:45+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_003",
    "zone_name": "Southern \u00d6resund Surveillance Zone",
    "dwell_minutes": 286.69999999999998863131622783839702606201171875,
    "points_in_zone": 51,
    "first_point": {
        "ts": "2026-10-24T22:02:05+00:00",
        "lat": 37.151735000000002173692337237298488616943359375,
        "lon": -6.88693329999999992452330843661911785602569580078125
    },
    "last_point": {
        "ts": "2026-10-25T02:48:45+00:00",
        "lat": 36.366933299999999462670530192553997039794921875,
        "lon": -7.40093829999999996971382643096148967742919921875
    }
}
Methodology: 2026.01.18
Sts🛰️✗ Southern Öresund Surveillance Zone
Oct 24, 2026 21:25 UTC 52/100 ▼
Vessel A: IMO 9753686 (HAFNIA TOPAZ) MARSHALL ISLANDS
Vessel B: IMO 9943372 (CL MARGARET MITCHELL) LIBERIA
  • Minimum Distance: 126 meters
  • Average Distance: 186 meters
  • Duration: 30 minutes
  • Period: 2026-10-24T21:25:46+00:00 to 2026-10-24T21:55:46+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 1.0 knots
  • Zone: Southern Öresund Surveillance Zone

Confidence Analysis

Score: 52/100

Low-confidence STS candidate - may warrant review. Two tankers (HAFNIA TOPAZ and CL MARGARET MITCHELL) maintained close proximity (min 126m, avg 186m) for 30 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.9 knots). Moderate distance variation observed during the encounter. Event occurred in Southern Öresund Surveillance Zone, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness20/25Min distance 126m, avg 186m
Duration5/25Duration 30 minutes
Speed Stability9/20both very slow; variable speeds
Distance Consistency8/15Distance variance ±84m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Southern Öresund Surveillance Zone

🛰️ Satellite Corroboration

✗ SAR Not Available

No satellite imagery for this time/location

No Sentinel-1 scenes covering AOI and time window

Searched: 2026-10-24T22:30:01.527966+00:00

Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 538006762,
        "imo": 9753686,
        "name": "HAFNIA TOPAZ",
        "flag": "MARSHALL ISLANDS"
    },
    "vessel_b": {
        "mmsi": 636022165,
        "imo": 9943372,
        "name": "CL MARGARET MITCHELL",
        "flag": "LIBERIA"
    },
    "min_distance_m": 125.900000000000005684341886080801486968994140625,
    "avg_distance_m": 185.5,
    "distance_consistency_m": 84.400000000000005684341886080801486968994140625,
    "duration_minutes": 30,
    "overlap_duration_s": 1800,
    "speed_a_avg": 0,
    "speed_a_std": 0,
    "speed_b_avg": 0.9499999999999999555910790149937383830547332763671875,
    "speed_b_std": 1.3400000000000000799360577730112709105014801025390625,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0,
            "max_sog": 0
        },
        "vessel_b": {
            "avg_sog": 0.9499999999999999555910790149937383830547332763671875,
            "max_sog": 1.899999999999999911182158029987476766109466552734375
        }
    },
    "time_window": {
        "start": "2026-10-24T21:25:46+00:00",
        "end": "2026-10-24T21:55:46+00:00"
    },
    "points_count": {
        "vessel_a": 2,
        "vessel_b": 2
    },
    "zone_id": "discovered_003",
    "zone_name": "Southern \u00d6resund Surveillance Zone",
    "score": {
        "value": 52,
        "components": {
            "distance_tightness": {
                "score": 20,
                "max": 25,
                "detail": "Min distance 126m, avg 186m"
            },
            "duration": {
                "score": 5,
                "max": 25,
                "detail": "Duration 30 minutes"
            },
            "speed_stability": {
                "score": 9,
                "max": 20,
                "detail": "both very slow; variable speeds"
            },
            "distance_consistency": {
                "score": 8,
                "max": 15,
                "detail": "Distance variance \u00b184m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Southern \u00d6resund Surveillance Zone"
            }
        },
        "summary": "Low-confidence STS candidate - may warrant review. Two tankers (HAFNIA TOPAZ and CL MARGARET MITCHELL) maintained close proximity (min 126m, avg 186m) for 30 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.9 knots). Moderate distance variation observed during the encounter. Event occurred in Southern \u00d6resund Surveillance Zone, a known STS activity area."
    },
    "sar": {
        "status": "not_found",
        "centroid": {
            "lat": 37.158480400000001964144757948815822601318359375,
            "lon": -6.895203699999999713554643676616251468658447265625
        },
        "time_window": {
            "start_ts": "2026-10-24T21:25:46+00:00",
            "end_ts": "2026-10-24T21:55:46+00:00"
        },
        "searched_at": "2026-10-24T22:30:01.527966+00:00",
        "notes": "No Sentinel-1 scenes covering AOI and time window"
    }
}
Methodology: 2026.01.18
Sts🛰️✗ Southern Öresund Surveillance Zone
Oct 24, 2026 21:21 UTC 44/100 ▼
Vessel A: IMO 9747106 (LIAN XI HU) HONG KONG
Vessel B: IMO 9943372 (CL MARGARET MITCHELL) LIBERIA
  • Minimum Distance: 285 meters
  • Average Distance: 353 meters
  • Duration: 36 minutes
  • Period: 2026-10-24T21:21:49+00:00 to 2026-10-24T21:57:49+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.6 knots
  • Zone: Southern Öresund Surveillance Zone

Confidence Analysis

Score: 44/100

Low-confidence STS candidate - may warrant review. Two tankers (LIAN XI HU and CL MARGARET MITCHELL) maintained close proximity (min 285m, avg 353m) for 36 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.6 knots). Event occurred in Southern Öresund Surveillance Zone, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness15/25Min distance 285m, avg 353m
Duration5/25Duration 36 minutes
Speed Stability9/20both very slow; variable speeds
Distance Consistency5/15Distance variance ±117m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Southern Öresund Surveillance Zone

🛰️ Satellite Corroboration

✗ SAR Not Available

No satellite imagery for this time/location

No Sentinel-1 scenes covering AOI and time window

Searched: 2026-10-25T03:30:12.301405+00:00

Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 477021600,
        "imo": 9747106,
        "name": "LIAN XI HU",
        "flag": "HONG KONG"
    },
    "vessel_b": {
        "mmsi": 636022165,
        "imo": 9943372,
        "name": "CL MARGARET MITCHELL",
        "flag": "LIBERIA"
    },
    "min_distance_m": 284.80000000000001136868377216160297393798828125,
    "avg_distance_m": 352.6000000000000227373675443232059478759765625,
    "distance_consistency_m": 117,
    "duration_minutes": 36,
    "overlap_duration_s": 2160,
    "speed_a_avg": 0,
    "speed_a_std": 0,
    "speed_b_avg": 0.63000000000000000444089209850062616169452667236328125,
    "speed_b_std": 1.100000000000000088817841970012523233890533447265625,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0,
            "max_sog": 0
        },
        "vessel_b": {
            "avg_sog": 0.63000000000000000444089209850062616169452667236328125,
            "max_sog": 1.899999999999999911182158029987476766109466552734375
        }
    },
    "time_window": {
        "start": "2026-10-24T21:21:49+00:00",
        "end": "2026-10-24T21:57:49+00:00"
    },
    "points_count": {
        "vessel_a": 3,
        "vessel_b": 3
    },
    "zone_id": "discovered_003",
    "zone_name": "Southern \u00d6resund Surveillance Zone",
    "score": {
        "value": 44,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 285m, avg 353m"
            },
            "duration": {
                "score": 5,
                "max": 25,
                "detail": "Duration 36 minutes"
            },
            "speed_stability": {
                "score": 9,
                "max": 20,
                "detail": "both very slow; variable speeds"
            },
            "distance_consistency": {
                "score": 5,
                "max": 15,
                "detail": "Distance variance \u00b1117m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Southern \u00d6resund Surveillance Zone"
            }
        },
        "summary": "Low-confidence STS candidate - may warrant review. Two tankers (LIAN XI HU and CL MARGARET MITCHELL) maintained close proximity (min 285m, avg 353m) for 36 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.6 knots). Event occurred in Southern \u00d6resund Surveillance Zone, a known STS activity area."
    },
    "sar": {
        "status": "not_found",
        "centroid": {
            "lat": 37.16005779999999703022695030085742473602294921875,
            "lon": -6.8976983000000000600948624196462333202362060546875
        },
        "time_window": {
            "start_ts": "2026-10-24T21:21:49+00:00",
            "end_ts": "2026-10-24T21:57:49+00:00"
        },
        "searched_at": "2026-10-25T03:30:12.301405+00:00",
        "notes": "No Sentinel-1 scenes covering AOI and time window"
    }
}
Methodology: 2026.01.18
Zone Dwell Southern Öresund Surveillance Zone
Oct 24, 2026 21:06 UTC 80.0% ▼
  • Zone: Southern Öresund Surveillance Zone
  • Duration: 5h 42m
  • Data Points: 60 AIS positions
  • Period: 2026-10-24T21:06:12+00:00 to 2026-10-25T02:48:45+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_003",
    "zone_name": "Southern \u00d6resund Surveillance Zone",
    "dwell_minutes": 342.6000000000000227373675443232059478759765625,
    "points_in_zone": 60,
    "first_point": {
        "ts": "2026-10-24T21:06:12+00:00",
        "lat": 37.15959670000000159006958710961043834686279296875,
        "lon": -6.8965917000000001024773155222646892070770263671875
    },
    "last_point": {
        "ts": "2026-10-25T02:48:45+00:00",
        "lat": 36.366933299999999462670530192553997039794921875,
        "lon": -7.40093829999999996971382643096148967742919921875
    }
}
Methodology: 2026.01.18
Sts🛰️✗ Southern Öresund Surveillance Zone
Oct 24, 2026 20:06 UTC 65/100 ▼
Vessel A: IMO 9943372 (CL MARGARET MITCHELL) LIBERIA
Vessel B: IMO 9753686 (HAFNIA TOPAZ) MARSHALL ISLANDS
  • Minimum Distance: 244 meters
  • Average Distance: 251 meters
  • Duration: 30 minutes
  • Period: 2026-10-24T20:06:12+00:00 to 2026-10-24T20:36:12+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Southern Öresund Surveillance Zone

Confidence Analysis

Score: 65/100

Moderate-confidence STS candidate. Two tankers (CL MARGARET MITCHELL and HAFNIA TOPAZ) maintained close proximity (min 244m, avg 251m) for 30 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 Southern Öresund Surveillance Zone, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness15/25Min distance 244m, avg 251m
Duration5/25Duration 30 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±5m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Southern Öresund Surveillance Zone

🛰️ Satellite Corroboration

✗ SAR Not Available

No satellite imagery for this time/location

No Sentinel-1 scenes covering AOI and time window

Searched: 2026-10-24T21:00:06.494618+00:00

Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 636022165,
        "imo": 9943372,
        "name": "CL MARGARET MITCHELL",
        "flag": "LIBERIA"
    },
    "vessel_b": {
        "mmsi": 538006762,
        "imo": 9753686,
        "name": "HAFNIA TOPAZ",
        "flag": "MARSHALL ISLANDS"
    },
    "min_distance_m": 243.900000000000005684341886080801486968994140625,
    "avg_distance_m": 251.19999999999998863131622783839702606201171875,
    "distance_consistency_m": 5.20000000000000017763568394002504646778106689453125,
    "duration_minutes": 30,
    "overlap_duration_s": 1800,
    "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": "2026-10-24T20:06:12+00:00",
        "end": "2026-10-24T20:36:12+00:00"
    },
    "points_count": {
        "vessel_a": 4,
        "vessel_b": 4
    },
    "zone_id": "discovered_003",
    "zone_name": "Southern \u00d6resund Surveillance Zone",
    "score": {
        "value": 65,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 244m, avg 251m"
            },
            "duration": {
                "score": 5,
                "max": 25,
                "detail": "Duration 30 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b15m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Southern \u00d6resund Surveillance Zone"
            }
        },
        "summary": "Moderate-confidence STS candidate. Two tankers (CL MARGARET MITCHELL and HAFNIA TOPAZ) maintained close proximity (min 244m, avg 251m) for 30 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 Southern \u00d6resund Surveillance Zone, a known STS activity area."
    },
    "sar": {
        "status": "not_found",
        "centroid": {
            "lat": 37.158936699999998154453351162374019622802734375,
            "lon": -6.89545019999999997395434547797776758670806884765625
        },
        "time_window": {
            "start_ts": "2026-10-24T20:06:12+00:00",
            "end_ts": "2026-10-24T20:36:12+00:00"
        },
        "searched_at": "2026-10-24T21:00:06.494618+00:00",
        "notes": "No Sentinel-1 scenes covering AOI and time window"
    }
}
Methodology: 2026.01.18
Sts Southern Öresund Surveillance Zone
Oct 24, 2026 20:00 UTC 62/100 ▼
Vessel A: IMO 9747106 (LIAN XI HU) HONG KONG
Vessel B: IMO 9943372 (CL MARGARET MITCHELL) LIBERIA
  • Minimum Distance: 279 meters
  • Average Distance: 317 meters
  • Duration: 1h 24m
  • Period: 2026-10-24T20:33:50+00:00 to 2026-10-24T21:57:49+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.3 knots
  • Zone: Southern Öresund Surveillance Zone

Confidence Analysis

Score: 62/100

Moderate-confidence STS candidate. Two tankers (LIAN XI HU and CL MARGARET MITCHELL) maintained close proximity (min 279m, avg 317m) for 84 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.3 knots). Moderate distance variation observed during the encounter. Event occurred in Southern Öresund Surveillance Zone, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness15/25Min distance 279m, avg 317m
Duration15/25Duration 84 minutes
Speed Stability14/20both nearly stationary; somewhat variable speeds
Distance Consistency8/15Distance variance ±84m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Southern Öresund Surveillance Zone
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 477021600,
        "imo": 9747106,
        "name": "LIAN XI HU",
        "flag": "HONG KONG"
    },
    "vessel_b": {
        "mmsi": 636022165,
        "imo": 9943372,
        "name": "CL MARGARET MITCHELL",
        "flag": "LIBERIA"
    },
    "min_distance_m": 279.1000000000000227373675443232059478759765625,
    "avg_distance_m": 317.19999999999998863131622783839702606201171875,
    "distance_consistency_m": 83.599999999999994315658113919198513031005859375,
    "duration_minutes": 84,
    "overlap_duration_s": 5039,
    "speed_a_avg": 0,
    "speed_a_std": 0,
    "speed_b_avg": 0.320000000000000006661338147750939242541790008544921875,
    "speed_b_std": 0.7800000000000000266453525910037569701671600341796875,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0,
            "max_sog": 0
        },
        "vessel_b": {
            "avg_sog": 0.320000000000000006661338147750939242541790008544921875,
            "max_sog": 1.899999999999999911182158029987476766109466552734375
        }
    },
    "time_window": {
        "start": "2026-10-24T20:33:50+00:00",
        "end": "2026-10-24T21:57:49+00:00"
    },
    "points_count": {
        "vessel_a": 6,
        "vessel_b": 6
    },
    "zone_id": "discovered_003",
    "zone_name": "Southern \u00d6resund Surveillance Zone",
    "score": {
        "value": 62,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 279m, avg 317m"
            },
            "duration": {
                "score": 15,
                "max": 25,
                "detail": "Duration 84 minutes"
            },
            "speed_stability": {
                "score": 14,
                "max": 20,
                "detail": "both nearly stationary; somewhat variable speeds"
            },
            "distance_consistency": {
                "score": 8,
                "max": 15,
                "detail": "Distance variance \u00b184m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Southern \u00d6resund Surveillance Zone"
            }
        },
        "summary": "Moderate-confidence STS candidate. Two tankers (LIAN XI HU and CL MARGARET MITCHELL) maintained close proximity (min 279m, avg 317m) for 84 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.3 knots). Moderate distance variation observed during the encounter. Event occurred in Southern \u00d6resund Surveillance Zone, a known STS activity area."
    }
}
Methodology: 2026.01.18
Zone Dwell Southern Öresund Surveillance Zone
Oct 24, 2026 20:00 UTC 80.0% ▼
  • Zone: Southern Öresund Surveillance Zone
  • Duration: 6h 24m
  • Data Points: 63 AIS positions
  • Period: 2026-10-24T20:24:12+00:00 to 2026-10-25T02:48:45+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_003",
    "zone_name": "Southern \u00d6resund Surveillance Zone",
    "dwell_minutes": 384.6000000000000227373675443232059478759765625,
    "points_in_zone": 63,
    "first_point": {
        "ts": "2026-10-24T20:24:12+00:00",
        "lat": 37.15961329999999662732079741545021533966064453125,
        "lon": -6.8965949999999995867483448819257318973541259765625
    },
    "last_point": {
        "ts": "2026-10-25T02:48:45+00:00",
        "lat": 36.366933299999999462670530192553997039794921875,
        "lon": -7.40093829999999996971382643096148967742919921875
    }
}
Methodology: 2026.01.18
Loiter Southern Öresund Surveillance Zone
Oct 24, 2026 20:00 UTC 75.0% ▼
  • Duration: 1h 54m
  • Radius: 205 meters
  • Data Points: 14 AIS positions
  • Centroid: 37.1595, -6.8965
  • Zone: Southern Öresund Surveillance Zone
Show Raw Evidence JSON
{
    "radius_m": 204.69999999999998863131622783839702606201171875,
    "duration_minutes": 114.5,
    "points": 14,
    "centroid": {
        "lat": 37.15948106428572117465591873042285442352294921875,
        "lon": -6.8965102357142864519801150890998542308807373046875
    },
    "bbox": {
        "min_lat": 37.15778499999999695546648581512272357940673828125,
        "min_lon": -6.8966200000000004166622602497227489948272705078125,
        "max_lat": 37.159643299999999044302967377007007598876953125,
        "max_lon": -6.89560330000000032413254302809946238994598388671875
    },
    "zone_id": "discovered_003"
}
Methodology: 2026.01.18
Sts Southern Öresund Surveillance Zone
Oct 24, 2026 19:15 UTC 72/100 ▼
Vessel A: IMO 9747106 (LIAN XI HU) HONG KONG
Vessel B: IMO 9943372 (CL MARGARET MITCHELL) LIBERIA
  • Minimum Distance: 279 meters
  • Average Distance: 306 meters
  • Duration: 2h 42m
  • Period: 2026-10-24T19:15:49+00:00 to 2026-10-24T21:57:49+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.2 knots
  • Zone: Southern Öresund Surveillance Zone

Confidence Analysis

Score: 72/100

Moderate-confidence STS candidate. Two tankers (LIAN XI HU and CL MARGARET MITCHELL) maintained close proximity (min 279m, avg 306m) for 162 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.2 knots). Moderate distance variation observed during the encounter. Event occurred in Southern Öresund Surveillance Zone, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness15/25Min distance 279m, avg 306m
Duration25/25Duration 162 minutes
Speed Stability14/20both nearly stationary; somewhat variable speeds
Distance Consistency8/15Distance variance ±68m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Southern Öresund Surveillance Zone
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 477021600,
        "imo": 9747106,
        "name": "LIAN XI HU",
        "flag": "HONG KONG"
    },
    "vessel_b": {
        "mmsi": 636022165,
        "imo": 9943372,
        "name": "CL MARGARET MITCHELL",
        "flag": "LIBERIA"
    },
    "min_distance_m": 279.1000000000000227373675443232059478759765625,
    "avg_distance_m": 305.5,
    "distance_consistency_m": 68.400000000000005684341886080801486968994140625,
    "duration_minutes": 162,
    "overlap_duration_s": 9720,
    "speed_a_avg": 0.01000000000000000020816681711721685132943093776702880859375,
    "speed_a_std": 0.0299999999999999988897769753748434595763683319091796875,
    "speed_b_avg": 0.2099999999999999922284388276239042170345783233642578125,
    "speed_b_std": 0.63000000000000000444089209850062616169452667236328125,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.01000000000000000020816681711721685132943093776702880859375,
            "max_sog": 0.1000000000000000055511151231257827021181583404541015625
        },
        "vessel_b": {
            "avg_sog": 0.2099999999999999922284388276239042170345783233642578125,
            "max_sog": 1.899999999999999911182158029987476766109466552734375
        }
    },
    "time_window": {
        "start": "2026-10-24T19:15:49+00:00",
        "end": "2026-10-24T21:57:49+00:00"
    },
    "points_count": {
        "vessel_a": 9,
        "vessel_b": 9
    },
    "zone_id": "discovered_003",
    "zone_name": "Southern \u00d6resund Surveillance Zone",
    "score": {
        "value": 72,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 279m, avg 306m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 162 minutes"
            },
            "speed_stability": {
                "score": 14,
                "max": 20,
                "detail": "both nearly stationary; somewhat variable speeds"
            },
            "distance_consistency": {
                "score": 8,
                "max": 15,
                "detail": "Distance variance \u00b168m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Southern \u00d6resund Surveillance Zone"
            }
        },
        "summary": "Moderate-confidence STS candidate. Two tankers (LIAN XI HU and CL MARGARET MITCHELL) maintained close proximity (min 279m, avg 306m) for 162 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.2 knots). Moderate distance variation observed during the encounter. Event occurred in Southern \u00d6resund Surveillance Zone, a known STS activity area."
    }
}
Methodology: 2026.01.18
Zone Dwell Southern Öresund Surveillance Zone
Oct 24, 2026 19:06 UTC 80.0% ▼
  • Zone: Southern Öresund Surveillance Zone
  • Duration: 6h 18m
  • Data Points: 61 AIS positions
  • Period: 2026-10-24T19:06:12+00:00 to 2026-10-25T01:24:45+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_003",
    "zone_name": "Southern \u00d6resund Surveillance Zone",
    "dwell_minutes": 378.6000000000000227373675443232059478759765625,
    "points_in_zone": 61,
    "first_point": {
        "ts": "2026-10-24T19:06:12+00:00",
        "lat": 37.15962669999999690162439947016537189483642578125,
        "lon": -6.896563300000000396039467887021601200103759765625
    },
    "last_point": {
        "ts": "2026-10-25T01:24:45+00:00",
        "lat": 36.62400999999999839928932487964630126953125,
        "lon": -7.1753567000000000319914761348627507686614990234375
    }
}
Methodology: 2026.01.18
Loiter Southern Öresund Surveillance Zone
Oct 24, 2026 19:06 UTC 75.0% ▼
  • Duration: 2h 48m
  • Radius: 209 meters
  • Data Points: 18 AIS positions
  • Centroid: 37.1595, -6.8965
  • Zone: Southern Öresund Surveillance Zone
Show Raw Evidence JSON
{
    "radius_m": 208.599999999999994315658113919198513031005859375,
    "duration_minutes": 168.599999999999994315658113919198513031005859375,
    "points": 18,
    "centroid": {
        "lat": 37.1595141666666677338071167469024658203125,
        "lon": -6.8965229611111116270194543176330626010894775390625
    },
    "bbox": {
        "min_lat": 37.15778499999999695546648581512272357940673828125,
        "min_lon": -6.8966200000000004166622602497227489948272705078125,
        "max_lat": 37.1596667000000024927430786192417144775390625,
        "max_lon": -6.89560330000000032413254302809946238994598388671875
    },
    "zone_id": "discovered_003"
}
Methodology: 2026.01.18
Sts Southern Öresund Surveillance Zone
Oct 24, 2026 19:03 UTC 80/100 ▼
Vessel A: IMO 9753686 (HAFNIA TOPAZ) MARSHALL ISLANDS
Vessel B: IMO 9943372 (CL MARGARET MITCHELL) LIBERIA
  • Minimum Distance: 244 meters
  • Average Distance: 250 meters
  • Duration: 1h 40m
  • Period: 2026-10-24T19:03:18+00:00 to 2026-10-24T20:43:46+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Southern Öresund Surveillance Zone

Confidence Analysis

Score: 80/100

High-confidence STS candidate. Two tankers (HAFNIA TOPAZ and CL MARGARET MITCHELL) maintained close proximity (min 244m, avg 250m) for 100 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 Southern Öresund Surveillance Zone, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness15/25Min distance 244m, avg 250m
Duration20/25Duration 100 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±3m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Southern Öresund Surveillance Zone
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 538006762,
        "imo": 9753686,
        "name": "HAFNIA TOPAZ",
        "flag": "MARSHALL ISLANDS"
    },
    "vessel_b": {
        "mmsi": 636022165,
        "imo": 9943372,
        "name": "CL MARGARET MITCHELL",
        "flag": "LIBERIA"
    },
    "min_distance_m": 243.900000000000005684341886080801486968994140625,
    "avg_distance_m": 249.599999999999994315658113919198513031005859375,
    "distance_consistency_m": 3.20000000000000017763568394002504646778106689453125,
    "duration_minutes": 100.5,
    "overlap_duration_s": 6028,
    "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": "2026-10-24T19:03:18+00:00",
        "end": "2026-10-24T20:43:46+00:00"
    },
    "points_count": {
        "vessel_a": 9,
        "vessel_b": 9
    },
    "zone_id": "discovered_003",
    "zone_name": "Southern \u00d6resund Surveillance Zone",
    "score": {
        "value": 80,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 244m, avg 250m"
            },
            "duration": {
                "score": 20,
                "max": 25,
                "detail": "Duration 100 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b13m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Southern \u00d6resund Surveillance Zone"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (HAFNIA TOPAZ and CL MARGARET MITCHELL) maintained close proximity (min 244m, avg 250m) for 100 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 Southern \u00d6resund Surveillance Zone, a known STS activity area."
    }
}
Methodology: 2026.01.18
Sts🛰️✗ Southern Öresund Surveillance Zone
Oct 24, 2026 18:24 UTC 75/100 ▼
Vessel A: IMO 9943372 (CL MARGARET MITCHELL) LIBERIA
Vessel B: IMO 9747106 (LIAN XI HU) HONG KONG
  • Minimum Distance: 281 meters
  • Average Distance: 282 meters
  • Duration: 1 hours
  • Period: 2026-10-24T18:24:12+00:00 to 2026-10-24T19:24:12+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.1 knots
  • Zone: Southern Öresund Surveillance Zone

Confidence Analysis

Score: 75/100

Moderate-confidence STS candidate. Two tankers (CL MARGARET MITCHELL and LIAN XI HU) maintained close proximity (min 280m, avg 282m) for 60 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.1 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Southern Öresund Surveillance Zone, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness15/25Min distance 280m, avg 282m
Duration15/25Duration 60 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±1m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Southern Öresund Surveillance Zone

🛰️ Satellite Corroboration

✗ SAR Not Available

No satellite imagery for this time/location

No Sentinel-1 scenes covering AOI and time window

Searched: 2026-10-25T00:00:01.893460+00:00

Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 636022165,
        "imo": 9943372,
        "name": "CL MARGARET MITCHELL",
        "flag": "LIBERIA"
    },
    "vessel_b": {
        "mmsi": 477021600,
        "imo": 9747106,
        "name": "LIAN XI HU",
        "flag": "HONG KONG"
    },
    "min_distance_m": 280.5,
    "avg_distance_m": 282.30000000000001136868377216160297393798828125,
    "distance_consistency_m": 1.399999999999999911182158029987476766109466552734375,
    "duration_minutes": 60,
    "overlap_duration_s": 3600,
    "speed_a_avg": 0,
    "speed_a_std": 0,
    "speed_b_avg": 0.08000000000000000166533453693773481063544750213623046875,
    "speed_b_std": 0.05000000000000000277555756156289135105907917022705078125,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0,
            "max_sog": 0
        },
        "vessel_b": {
            "avg_sog": 0.08000000000000000166533453693773481063544750213623046875,
            "max_sog": 0.1000000000000000055511151231257827021181583404541015625
        }
    },
    "time_window": {
        "start": "2026-10-24T18:24:12+00:00",
        "end": "2026-10-24T19:24:12+00:00"
    },
    "points_count": {
        "vessel_a": 4,
        "vessel_b": 4
    },
    "zone_id": "discovered_003",
    "zone_name": "Southern \u00d6resund Surveillance Zone",
    "score": {
        "value": 75,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 280m, avg 282m"
            },
            "duration": {
                "score": 15,
                "max": 25,
                "detail": "Duration 60 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: Southern \u00d6resund Surveillance Zone"
            }
        },
        "summary": "Moderate-confidence STS candidate. Two tankers (CL MARGARET MITCHELL and LIAN XI HU) maintained close proximity (min 280m, avg 282m) for 60 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.1 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Southern \u00d6resund Surveillance Zone, a known STS activity area."
    },
    "sar": {
        "status": "not_found",
        "centroid": {
            "lat": 37.1603592000000020334482542239129543304443359375,
            "lon": -6.89785920000000007945573088363744318485260009765625
        },
        "time_window": {
            "start_ts": "2026-10-24T18:24:12+00:00",
            "end_ts": "2026-10-24T19:24:12+00:00"
        },
        "searched_at": "2026-10-25T00:00:01.893460+00:00",
        "notes": "No Sentinel-1 scenes covering AOI and time window"
    }
}
Methodology: 2026.01.18
Zone Dwell Southern Öresund Surveillance Zone
Oct 24, 2026 18:24 UTC 80.0% ▼
  • Zone: Southern Öresund Surveillance Zone
  • Duration: 5h 52m
  • Data Points: 61 AIS positions
  • Period: 2026-10-24T18:24:12+00:00 to 2026-10-25T00:17:05+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_003",
    "zone_name": "Southern \u00d6resund Surveillance Zone",
    "dwell_minutes": 352.8999999999999772626324556767940521240234375,
    "points_in_zone": 61,
    "first_point": {
        "ts": "2026-10-24T18:24:12+00:00",
        "lat": 37.15956330000000207292032428085803985595703125,
        "lon": -6.89658830000000033777496355469338595867156982421875
    },
    "last_point": {
        "ts": "2026-10-25T00:17:05+00:00",
        "lat": 36.82491999999999876536094234324991703033447265625,
        "lon": -7.008333300000000321006154990755021572113037109375
    }
}
Methodology: 2026.01.18
Loiter Southern Öresund Surveillance Zone
Oct 24, 2026 18:24 UTC 75.0% ▼
  • Duration: 3h 30m
  • Radius: 209 meters
  • Data Points: 19 AIS positions
  • Centroid: 37.1595, -6.8965
  • Zone: Southern Öresund Surveillance Zone
Show Raw Evidence JSON
{
    "radius_m": 209,
    "duration_minutes": 210.599999999999994315658113919198513031005859375,
    "points": 19,
    "centroid": {
        "lat": 37.1595167526315748318666010163724422454833984375,
        "lon": -6.8965264000000008337565304827876389026641845703125
    },
    "bbox": {
        "min_lat": 37.15778499999999695546648581512272357940673828125,
        "min_lon": -6.8966200000000004166622602497227489948272705078125,
        "max_lat": 37.1596667000000024927430786192417144775390625,
        "max_lon": -6.89560330000000032413254302809946238994598388671875
    },
    "zone_id": "discovered_003"
}
Methodology: 2026.01.18
Sts Southern Öresund Surveillance Zone
Oct 24, 2026 17:36 UTC 80/100 ▼
Vessel A: IMO 9943372 (CL MARGARET MITCHELL) LIBERIA
Vessel B: IMO 9747106 (LIAN XI HU) HONG KONG
  • Minimum Distance: 270 meters
  • Average Distance: 279 meters
  • Duration: 1h 48m
  • Period: 2026-10-24T17:36:12+00:00 to 2026-10-24T19:24:12+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.1 knots
  • Zone: Southern Öresund Surveillance Zone

Confidence Analysis

Score: 80/100

High-confidence STS candidate. Two tankers (CL MARGARET MITCHELL and LIAN XI HU) maintained close proximity (min 270m, avg 279m) for 108 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.1 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Southern Öresund Surveillance Zone, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness15/25Min distance 270m, avg 279m
Duration20/25Duration 108 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±5m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Southern Öresund Surveillance Zone
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 636022165,
        "imo": 9943372,
        "name": "CL MARGARET MITCHELL",
        "flag": "LIBERIA"
    },
    "vessel_b": {
        "mmsi": 477021600,
        "imo": 9747106,
        "name": "LIAN XI HU",
        "flag": "HONG KONG"
    },
    "min_distance_m": 270.3999999999999772626324556767940521240234375,
    "avg_distance_m": 279.3999999999999772626324556767940521240234375,
    "distance_consistency_m": 5,
    "duration_minutes": 108,
    "overlap_duration_s": 6480,
    "speed_a_avg": 0,
    "speed_a_std": 0,
    "speed_b_avg": 0.05000000000000000277555756156289135105907917022705078125,
    "speed_b_std": 0.05000000000000000277555756156289135105907917022705078125,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0,
            "max_sog": 0
        },
        "vessel_b": {
            "avg_sog": 0.05000000000000000277555756156289135105907917022705078125,
            "max_sog": 0.1000000000000000055511151231257827021181583404541015625
        }
    },
    "time_window": {
        "start": "2026-10-24T17:36:12+00:00",
        "end": "2026-10-24T19:24:12+00:00"
    },
    "points_count": {
        "vessel_a": 6,
        "vessel_b": 6
    },
    "zone_id": "discovered_003",
    "zone_name": "Southern \u00d6resund Surveillance Zone",
    "score": {
        "value": 80,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 270m, avg 279m"
            },
            "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 \u00b15m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Southern \u00d6resund Surveillance Zone"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (CL MARGARET MITCHELL and LIAN XI HU) maintained close proximity (min 270m, avg 279m) for 108 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.1 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Southern \u00d6resund Surveillance Zone, a known STS activity area."
    }
}
Methodology: 2026.01.18
Sts🛰️✗ Southern Öresund Surveillance Zone
Oct 24, 2026 17:00 UTC 65/100 ▼
Vessel A: IMO 9943372 (CL MARGARET MITCHELL) LIBERIA
Vessel B: IMO 9753686 (HAFNIA TOPAZ) MARSHALL ISLANDS
  • Minimum Distance: 249 meters
  • Average Distance: 257 meters
  • Duration: 36 minutes
  • Period: 2026-10-24T17:00:12+00:00 to 2026-10-24T17:36:12+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Southern Öresund Surveillance Zone

Confidence Analysis

Score: 65/100

Moderate-confidence STS candidate. Two tankers (CL MARGARET MITCHELL and HAFNIA TOPAZ) maintained close proximity (min 249m, avg 257m) for 36 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 Southern Öresund Surveillance Zone, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness15/25Min distance 249m, avg 257m
Duration5/25Duration 36 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±8m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Southern Öresund Surveillance Zone

🛰️ Satellite Corroboration

✗ SAR Not Available

No satellite imagery for this time/location

No Sentinel-1 scenes covering AOI and time window

Searched: 2026-10-24T23:15:01.483098+00:00

Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 636022165,
        "imo": 9943372,
        "name": "CL MARGARET MITCHELL",
        "flag": "LIBERIA"
    },
    "vessel_b": {
        "mmsi": 538006762,
        "imo": 9753686,
        "name": "HAFNIA TOPAZ",
        "flag": "MARSHALL ISLANDS"
    },
    "min_distance_m": 249,
    "avg_distance_m": 256.69999999999998863131622783839702606201171875,
    "distance_consistency_m": 8.4000000000000003552713678800500929355621337890625,
    "duration_minutes": 36,
    "overlap_duration_s": 2160,
    "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": "2026-10-24T17:00:12+00:00",
        "end": "2026-10-24T17:36:12+00:00"
    },
    "points_count": {
        "vessel_a": 3,
        "vessel_b": 3
    },
    "zone_id": "discovered_003",
    "zone_name": "Southern \u00d6resund Surveillance Zone",
    "score": {
        "value": 65,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 249m, avg 257m"
            },
            "duration": {
                "score": 5,
                "max": 25,
                "detail": "Duration 36 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b18m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Southern \u00d6resund Surveillance Zone"
            }
        },
        "summary": "Moderate-confidence STS candidate. Two tankers (CL MARGARET MITCHELL and HAFNIA TOPAZ) maintained close proximity (min 249m, avg 257m) for 36 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 Southern \u00d6resund Surveillance Zone, a known STS activity area."
    },
    "sar": {
        "status": "not_found",
        "centroid": {
            "lat": 37.15896719999999930905687506310641765594482421875,
            "lon": -6.89546309999999973427975419326685369014739990234375
        },
        "time_window": {
            "start_ts": "2026-10-24T17:00:12+00:00",
            "end_ts": "2026-10-24T17:36:12+00:00"
        },
        "searched_at": "2026-10-24T23:15:01.483098+00:00",
        "notes": "No Sentinel-1 scenes covering AOI and time window"
    }
}
Methodology: 2026.01.18
Zone Dwell Southern Öresund Surveillance Zone
Oct 24, 2026 17:00 UTC 80.0% ▼
  • Zone: Southern Öresund Surveillance Zone
  • Duration: 6h 34m
  • Data Points: 62 AIS positions
  • Period: 2026-10-24T17:42:12+00:00 to 2026-10-25T00:17:05+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_003",
    "zone_name": "Southern \u00d6resund Surveillance Zone",
    "dwell_minutes": 394.8999999999999772626324556767940521240234375,
    "points_in_zone": 62,
    "first_point": {
        "ts": "2026-10-24T17:42:12+00:00",
        "lat": 37.15963500000000152567736222408711910247802734375,
        "lon": -6.8965750000000003439026841078884899616241455078125
    },
    "last_point": {
        "ts": "2026-10-25T00:17:05+00:00",
        "lat": 36.82491999999999876536094234324991703033447265625,
        "lon": -7.008333300000000321006154990755021572113037109375
    }
}
Methodology: 2026.01.18
Loiter Southern Öresund Surveillance Zone
Oct 24, 2026 17:00 UTC 75.0% ▼
  • Duration: 4h 54m
  • Radius: 212 meters
  • Data Points: 23 AIS positions
  • Centroid: 37.1595, -6.8965
  • Zone: Southern Öresund Surveillance Zone
Show Raw Evidence JSON
{
    "radius_m": 212,
    "duration_minutes": 294.6000000000000227373675443232059478759765625,
    "points": 23,
    "centroid": {
        "lat": 37.15954159130433964719486539252102375030517578125,
        "lon": -6.89653970869565302592718580854125320911407470703125
    },
    "bbox": {
        "min_lat": 37.15778499999999695546648581512272357940673828125,
        "min_lon": -6.89663170000000036452547647058963775634765625,
        "max_lat": 37.15968500000000318550519295968115329742431640625,
        "max_lon": -6.89560330000000032413254302809946238994598388671875
    },
    "zone_id": "discovered_003"
}
Methodology: 2026.01.18
Sts Southern Öresund Surveillance Zone
Oct 24, 2026 16:36 UTC 75/100 ▼
Vessel A: IMO 9943372 (CL MARGARET MITCHELL) LIBERIA
Vessel B: IMO 9753686 (HAFNIA TOPAZ) MARSHALL ISLANDS
  • Minimum Distance: 249 meters
  • Average Distance: 255 meters
  • Duration: 1 hours
  • Period: 2026-10-24T16:36:12+00:00 to 2026-10-24T17:36:12+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Southern Öresund Surveillance Zone

Confidence Analysis

Score: 75/100

Moderate-confidence STS candidate. Two tankers (CL MARGARET MITCHELL and HAFNIA TOPAZ) maintained close proximity (min 249m, avg 255m) for 60 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 Southern Öresund Surveillance Zone, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness15/25Min distance 249m, avg 255m
Duration15/25Duration 60 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±8m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Southern Öresund Surveillance Zone
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 636022165,
        "imo": 9943372,
        "name": "CL MARGARET MITCHELL",
        "flag": "LIBERIA"
    },
    "vessel_b": {
        "mmsi": 538006762,
        "imo": 9753686,
        "name": "HAFNIA TOPAZ",
        "flag": "MARSHALL ISLANDS"
    },
    "min_distance_m": 249,
    "avg_distance_m": 255.099999999999994315658113919198513031005859375,
    "distance_consistency_m": 7.5,
    "duration_minutes": 60,
    "overlap_duration_s": 3600,
    "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": "2026-10-24T16:36:12+00:00",
        "end": "2026-10-24T17:36:12+00:00"
    },
    "points_count": {
        "vessel_a": 4,
        "vessel_b": 4
    },
    "zone_id": "discovered_003",
    "zone_name": "Southern \u00d6resund Surveillance Zone",
    "score": {
        "value": 75,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 249m, avg 255m"
            },
            "duration": {
                "score": 15,
                "max": 25,
                "detail": "Duration 60 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b18m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Southern \u00d6resund Surveillance Zone"
            }
        },
        "summary": "Moderate-confidence STS candidate. Two tankers (CL MARGARET MITCHELL and HAFNIA TOPAZ) maintained close proximity (min 249m, avg 255m) for 60 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 Southern \u00d6resund Surveillance Zone, a known STS activity area."
    }
}
Methodology: 2026.01.18
Sts🛰️✗ Southern Öresund Surveillance Zone
Oct 24, 2026 16:06 UTC 80/100 ▼
Vessel A: IMO 9747106 (LIAN XI HU) HONG KONG
Vessel B: IMO 9943372 (CL MARGARET MITCHELL) LIBERIA
  • Minimum Distance: 277 meters
  • Average Distance: 280 meters
  • Duration: 1h 42m
  • Period: 2026-10-24T16:09:49+00:00 to 2026-10-24T17:51:49+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Southern Öresund Surveillance Zone

Confidence Analysis

Score: 80/100

High-confidence STS candidate. Two tankers (LIAN XI HU and CL MARGARET MITCHELL) maintained close proximity (min 277m, avg 280m) for 102 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 Southern Öresund Surveillance Zone, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness15/25Min distance 277m, avg 280m
Duration20/25Duration 102 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±2m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Southern Öresund Surveillance Zone

🛰️ Satellite Corroboration

✗ SAR Not Available

No satellite imagery for this time/location

No Sentinel-1 scenes covering AOI and time window

Searched: 2026-10-24T22:30:03.924155+00:00

Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 477021600,
        "imo": 9747106,
        "name": "LIAN XI HU",
        "flag": "HONG KONG"
    },
    "vessel_b": {
        "mmsi": 636022165,
        "imo": 9943372,
        "name": "CL MARGARET MITCHELL",
        "flag": "LIBERIA"
    },
    "min_distance_m": 277,
    "avg_distance_m": 279.80000000000001136868377216160297393798828125,
    "distance_consistency_m": 2.29999999999999982236431605997495353221893310546875,
    "duration_minutes": 102,
    "overlap_duration_s": 6120,
    "speed_a_avg": 0.0200000000000000004163336342344337026588618755340576171875,
    "speed_a_std": 0.040000000000000000832667268468867405317723751068115234375,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.0200000000000000004163336342344337026588618755340576171875,
            "max_sog": 0.1000000000000000055511151231257827021181583404541015625
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-10-24T16:09:49+00:00",
        "end": "2026-10-24T17:51:49+00:00"
    },
    "points_count": {
        "vessel_a": 6,
        "vessel_b": 6
    },
    "zone_id": "discovered_003",
    "zone_name": "Southern \u00d6resund Surveillance Zone",
    "score": {
        "value": 80,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 277m, avg 280m"
            },
            "duration": {
                "score": 20,
                "max": 25,
                "detail": "Duration 102 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: Southern \u00d6resund Surveillance Zone"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (LIAN XI HU and CL MARGARET MITCHELL) maintained close proximity (min 277m, avg 280m) for 102 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 Southern \u00d6resund Surveillance Zone, a known STS activity area."
    },
    "sar": {
        "status": "not_found",
        "centroid": {
            "lat": 37.16036139999999932115315459668636322021484375,
            "lon": -6.89786120000000035901166484109126031398773193359375
        },
        "time_window": {
            "start_ts": "2026-10-24T16:06:12+00:00",
            "end_ts": "2026-10-24T17:00:12+00:00"
        },
        "searched_at": "2026-10-24T22:30:03.924155+00:00",
        "notes": "No Sentinel-1 scenes covering AOI and time window"
    }
}
Methodology: 2026.01.18
Zone Dwell Southern Öresund Surveillance Zone
Oct 24, 2026 16:06 UTC 80.0% ▼
  • Zone: Southern Öresund Surveillance Zone
  • Duration: 6h 27m
  • Data Points: 50 AIS positions
  • Period: 2026-10-24T16:36:12+00:00 to 2026-10-24T23:03:35+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_003",
    "zone_name": "Southern \u00d6resund Surveillance Zone",
    "dwell_minutes": 387.3999999999999772626324556767940521240234375,
    "points_in_zone": 50,
    "first_point": {
        "ts": "2026-10-24T16:36:12+00:00",
        "lat": 37.15962329999999980145730660296976566314697265625,
        "lon": -6.8965949999999995867483448819257318973541259765625
    },
    "last_point": {
        "ts": "2026-10-24T23:03:35+00:00",
        "lat": 37.01571500000000014551915228366851806640625,
        "lon": -6.84838669999999982707095114164985716342926025390625
    }
}
Methodology: 2026.01.18
Loiter Southern Öresund Surveillance Zone
Oct 24, 2026 16:06 UTC 75.0% ▼
  • Duration: 5h 48m
  • Radius: 213 meters
  • Data Points: 26 AIS positions
  • Centroid: 37.1595, -6.8965
  • Zone: Southern Öresund Surveillance Zone
Show Raw Evidence JSON
{
    "radius_m": 212.900000000000005684341886080801486968994140625,
    "duration_minutes": 348.6000000000000227373675443232059478759765625,
    "points": 26,
    "centroid": {
        "lat": 37.159549546153840537954238243401050567626953125,
        "lon": -6.8965442307692317314149477169848978519439697265625
    },
    "bbox": {
        "min_lat": 37.15778499999999695546648581512272357940673828125,
        "min_lon": -6.89663170000000036452547647058963775634765625,
        "max_lat": 37.15968500000000318550519295968115329742431640625,
        "max_lon": -6.89560330000000032413254302809946238994598388671875
    },
    "zone_id": "discovered_003"
}
Methodology: 2026.01.18
Sts Southern Öresund Surveillance Zone
Oct 24, 2026 15:36 UTC 85/100 ▼
Vessel A: IMO 9943372 (CL MARGARET MITCHELL) LIBERIA
Vessel B: IMO 9753686 (HAFNIA TOPAZ) MARSHALL ISLANDS
  • Minimum Distance: 248 meters
  • Average Distance: 253 meters
  • Duration: 2 hours
  • Period: 2026-10-24T15:36:12+00:00 to 2026-10-24T17:36:12+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Southern Öresund Surveillance Zone

Confidence Analysis

Score: 85/100

High-confidence STS candidate. Two tankers (CL MARGARET MITCHELL and HAFNIA TOPAZ) maintained close proximity (min 248m, avg 253m) for 120 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 Southern Öresund Surveillance Zone, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness15/25Min distance 248m, avg 253m
Duration25/25Duration 120 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±6m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Southern Öresund Surveillance Zone
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 636022165,
        "imo": 9943372,
        "name": "CL MARGARET MITCHELL",
        "flag": "LIBERIA"
    },
    "vessel_b": {
        "mmsi": 538006762,
        "imo": 9753686,
        "name": "HAFNIA TOPAZ",
        "flag": "MARSHALL ISLANDS"
    },
    "min_distance_m": 247.5,
    "avg_distance_m": 252.900000000000005684341886080801486968994140625,
    "distance_consistency_m": 5.9000000000000003552713678800500929355621337890625,
    "duration_minutes": 120,
    "overlap_duration_s": 7200,
    "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": "2026-10-24T15:36:12+00:00",
        "end": "2026-10-24T17:36:12+00:00"
    },
    "points_count": {
        "vessel_a": 8,
        "vessel_b": 8
    },
    "zone_id": "discovered_003",
    "zone_name": "Southern \u00d6resund Surveillance Zone",
    "score": {
        "value": 85,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 248m, avg 253m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 120 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b16m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Southern \u00d6resund Surveillance Zone"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (CL MARGARET MITCHELL and HAFNIA TOPAZ) maintained close proximity (min 248m, avg 253m) for 120 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 Southern \u00d6resund Surveillance Zone, a known STS activity area."
    }
}
Methodology: 2026.01.18
Sts Southern Öresund Surveillance Zone
Oct 24, 2026 15:24 UTC 85/100 ▼
Vessel A: IMO 9747106 (LIAN XI HU) HONG KONG
Vessel B: IMO 9943372 (CL MARGARET MITCHELL) LIBERIA
  • Minimum Distance: 277 meters
  • Average Distance: 281 meters
  • Duration: 2h 24m
  • Period: 2026-10-24T15:27:49+00:00 to 2026-10-24T17:51:49+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Southern Öresund Surveillance Zone

Confidence Analysis

Score: 85/100

High-confidence STS candidate. Two tankers (LIAN XI HU and CL MARGARET MITCHELL) maintained close proximity (min 277m, avg 281m) for 144 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 Southern Öresund Surveillance Zone, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness15/25Min distance 277m, avg 281m
Duration25/25Duration 144 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±2m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Southern Öresund Surveillance Zone
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 477021600,
        "imo": 9747106,
        "name": "LIAN XI HU",
        "flag": "HONG KONG"
    },
    "vessel_b": {
        "mmsi": 636022165,
        "imo": 9943372,
        "name": "CL MARGARET MITCHELL",
        "flag": "LIBERIA"
    },
    "min_distance_m": 277,
    "avg_distance_m": 280.6000000000000227373675443232059478759765625,
    "distance_consistency_m": 2.5,
    "duration_minutes": 144,
    "overlap_duration_s": 8640,
    "speed_a_avg": 0.01000000000000000020816681711721685132943093776702880859375,
    "speed_a_std": 0.0299999999999999988897769753748434595763683319091796875,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.01000000000000000020816681711721685132943093776702880859375,
            "max_sog": 0.1000000000000000055511151231257827021181583404541015625
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-10-24T15:27:49+00:00",
        "end": "2026-10-24T17:51:49+00:00"
    },
    "points_count": {
        "vessel_a": 10,
        "vessel_b": 10
    },
    "zone_id": "discovered_003",
    "zone_name": "Southern \u00d6resund Surveillance Zone",
    "score": {
        "value": 85,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 277m, avg 281m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 144 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b12m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Southern \u00d6resund Surveillance Zone"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (LIAN XI HU and CL MARGARET MITCHELL) maintained close proximity (min 277m, avg 281m) for 144 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 Southern \u00d6resund Surveillance Zone, a known STS activity area."
    }
}
Methodology: 2026.01.18
Zone Dwell Southern Öresund Surveillance Zone
Oct 24, 2026 15:00 UTC 80.0% ▼
  • Zone: Southern Öresund Surveillance Zone
  • Duration: 6h 31m
  • Data Points: 34 AIS positions
  • Period: 2026-10-24T15:48:12+00:00 to 2026-10-24T22:19:46+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_003",
    "zone_name": "Southern \u00d6resund Surveillance Zone",
    "dwell_minutes": 391.6000000000000227373675443232059478759765625,
    "points_in_zone": 34,
    "first_point": {
        "ts": "2026-10-24T15:48:12+00:00",
        "lat": 37.15964000000000311274561681784689426422119140625,
        "lon": -6.896596699999999913188730715773999691009521484375
    },
    "last_point": {
        "ts": "2026-10-24T22:19:46+00:00",
        "lat": 37.13329329999999828260115464217960834503173828125,
        "lon": -6.84611829999999965679080560221336781978607177734375
    }
}
Methodology: 2026.01.18
Loiter Southern Öresund Surveillance Zone
Oct 24, 2026 15:00 UTC 75.0% ▼
  • Duration: 6h 30m
  • Radius: 214 meters
  • Data Points: 29 AIS positions
  • Centroid: 37.1596, -6.8966
  • Zone: Southern Öresund Surveillance Zone
Show Raw Evidence JSON
{
    "radius_m": 214,
    "duration_minutes": 390.6000000000000227373675443232059478759765625,
    "points": 29,
    "centroid": {
        "lat": 37.15955775172414377038876409642398357391357421875,
        "lon": -6.89655000000000040216718844021670520305633544921875
    },
    "bbox": {
        "min_lat": 37.15778499999999695546648581512272357940673828125,
        "min_lon": -6.89663170000000036452547647058963775634765625,
        "max_lat": 37.15968500000000318550519295968115329742431640625,
        "max_lon": -6.89560330000000032413254302809946238994598388671875
    },
    "zone_id": "discovered_003"
}
Methodology: 2026.01.18
Sts Southern Öresund Surveillance Zone
Oct 24, 2026 14:36 UTC 85/100 ▼
Vessel A: IMO 9747106 (LIAN XI HU) HONG KONG
Vessel B: IMO 9943372 (CL MARGARET MITCHELL) LIBERIA
  • Minimum Distance: 277 meters
  • Average Distance: 280 meters
  • Duration: 3h 6m
  • Period: 2026-10-24T14:45:49+00:00 to 2026-10-24T17:51:49+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Southern Öresund Surveillance Zone

Confidence Analysis

Score: 85/100

High-confidence STS candidate. Two tankers (LIAN XI HU and CL MARGARET MITCHELL) maintained close proximity (min 277m, avg 280m) 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 Southern Öresund Surveillance Zone, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness15/25Min distance 277m, avg 280m
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: Southern Öresund Surveillance Zone
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 477021600,
        "imo": 9747106,
        "name": "LIAN XI HU",
        "flag": "HONG KONG"
    },
    "vessel_b": {
        "mmsi": 636022165,
        "imo": 9943372,
        "name": "CL MARGARET MITCHELL",
        "flag": "LIBERIA"
    },
    "min_distance_m": 276.6000000000000227373675443232059478759765625,
    "avg_distance_m": 280,
    "distance_consistency_m": 2.5,
    "duration_minutes": 186,
    "overlap_duration_s": 11160,
    "speed_a_avg": 0.01000000000000000020816681711721685132943093776702880859375,
    "speed_a_std": 0.040000000000000000832667268468867405317723751068115234375,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.01000000000000000020816681711721685132943093776702880859375,
            "max_sog": 0.1000000000000000055511151231257827021181583404541015625
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-10-24T14:45:49+00:00",
        "end": "2026-10-24T17:51:49+00:00"
    },
    "points_count": {
        "vessel_a": 14,
        "vessel_b": 14
    },
    "zone_id": "discovered_003",
    "zone_name": "Southern \u00d6resund Surveillance Zone",
    "score": {
        "value": 85,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 277m, avg 280m"
            },
            "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: Southern \u00d6resund Surveillance Zone"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (LIAN XI HU and CL MARGARET MITCHELL) maintained close proximity (min 277m, avg 280m) 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 Southern \u00d6resund Surveillance Zone, a known STS activity area."
    }
}
Methodology: 2026.01.18
Sts🛰️✗ Southern Öresund Surveillance Zone
Oct 24, 2026 14:06 UTC 85/100 ▼
Vessel A: IMO 9753686 (HAFNIA TOPAZ) MARSHALL ISLANDS
Vessel B: IMO 9943372 (CL MARGARET MITCHELL) LIBERIA
  • Minimum Distance: 244 meters
  • Average Distance: 251 meters
  • Duration: 2h 12m
  • Period: 2026-10-24T14:06:52+00:00 to 2026-10-24T16:18:52+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Southern Öresund Surveillance Zone

Confidence Analysis

Score: 85/100

High-confidence STS candidate. Two tankers (HAFNIA TOPAZ and CL MARGARET MITCHELL) maintained close proximity (min 244m, avg 251m) for 132 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 Southern Öresund Surveillance Zone, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness15/25Min distance 244m, avg 251m
Duration25/25Duration 132 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±5m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Southern Öresund Surveillance Zone

🛰️ Satellite Corroboration

✗ SAR Not Available

No satellite imagery for this time/location

No Sentinel-1 scenes covering AOI and time window

Searched: 2026-10-24T20:45:04.926983+00:00

Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 538006762,
        "imo": 9753686,
        "name": "HAFNIA TOPAZ",
        "flag": "MARSHALL ISLANDS"
    },
    "vessel_b": {
        "mmsi": 636022165,
        "imo": 9943372,
        "name": "CL MARGARET MITCHELL",
        "flag": "LIBERIA"
    },
    "min_distance_m": 244.099999999999994315658113919198513031005859375,
    "avg_distance_m": 251.30000000000001136868377216160297393798828125,
    "distance_consistency_m": 4.70000000000000017763568394002504646778106689453125,
    "duration_minutes": 132,
    "overlap_duration_s": 7920,
    "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": "2026-10-24T14:06:52+00:00",
        "end": "2026-10-24T16:18:52+00:00"
    },
    "points_count": {
        "vessel_a": 9,
        "vessel_b": 9
    },
    "zone_id": "discovered_003",
    "zone_name": "Southern \u00d6resund Surveillance Zone",
    "score": {
        "value": 85,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 244m, avg 251m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 132 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b15m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Southern \u00d6resund Surveillance Zone"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (HAFNIA TOPAZ and CL MARGARET MITCHELL) maintained close proximity (min 244m, avg 251m) for 132 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 Southern \u00d6resund Surveillance Zone, a known STS activity area."
    },
    "sar": {
        "status": "not_found",
        "centroid": {
            "lat": 37.15895040000000193458618014119565486907958984375,
            "lon": -6.89545959999999968914607961778528988361358642578125
        },
        "time_window": {
            "start_ts": "2026-10-24T14:06:52+00:00",
            "end_ts": "2026-10-24T16:18:52+00:00"
        },
        "searched_at": "2026-10-24T20:45:04.926983+00:00",
        "notes": "No Sentinel-1 scenes covering AOI and time window"
    }
}
Methodology: 2026.01.18
Zone Dwell Southern Öresund Surveillance Zone
Oct 24, 2026 14:06 UTC 80.0% ▼
  • Zone: Southern Öresund Surveillance Zone
  • Duration: 6h 24m
  • Data Points: 25 AIS positions
  • Period: 2026-10-24T14:54:12+00:00 to 2026-10-24T21:18:12+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_003",
    "zone_name": "Southern \u00d6resund Surveillance Zone",
    "dwell_minutes": 384,
    "points_in_zone": 25,
    "first_point": {
        "ts": "2026-10-24T14:54:12+00:00",
        "lat": 37.15963500000000152567736222408711910247802734375,
        "lon": -6.89660999999999990706101016257889568805694580078125
    },
    "last_point": {
        "ts": "2026-10-24T21:18:12+00:00",
        "lat": 37.15959500000000303998604067601263523101806640625,
        "lon": -6.89655500000000021287860363372601568698883056640625
    }
}
Methodology: 2026.01.18
Loiter Southern Öresund Surveillance Zone
Oct 24, 2026 14:06 UTC 75.0% ▼
  • Duration: 6h 24m
  • Radius: 8 meters
  • Data Points: 25 AIS positions
  • Centroid: 37.1596, -6.8966
  • Zone: Southern Öresund Surveillance Zone
Show Raw Evidence JSON
{
    "radius_m": 7.5999999999999996447286321199499070644378662109375,
    "duration_minutes": 384,
    "points": 25,
    "centroid": {
        "lat": 37.15962432800000669885776005685329437255859375,
        "lon": -6.89658653600000004502135197981260716915130615234375
    },
    "bbox": {
        "min_lat": 37.15956330000000207292032428085803985595703125,
        "min_lon": -6.89663170000000036452547647058963775634765625,
        "max_lat": 37.15968500000000318550519295968115329742431640625,
        "max_lon": -6.896551699999999840429154573939740657806396484375
    },
    "zone_id": "discovered_003"
}
Methodology: 2026.01.18
Sts🛰️✗ Southern Öresund Surveillance Zone
Oct 24, 2026 13:57 UTC 85/100 ▼
Vessel A: IMO 9747106 (LIAN XI HU) HONG KONG
Vessel B: IMO 9943372 (CL MARGARET MITCHELL) LIBERIA
  • Minimum Distance: 275 meters
  • Average Distance: 280 meters
  • Duration: 3h 54m
  • Period: 2026-10-24T13:57:49+00:00 to 2026-10-24T17:51:49+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Southern Öresund Surveillance Zone

Confidence Analysis

Score: 85/100

High-confidence STS candidate. Two tankers (LIAN XI HU and CL MARGARET MITCHELL) maintained close proximity (min 275m, avg 280m) for 234 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 Southern Öresund Surveillance Zone, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness15/25Min distance 275m, avg 280m
Duration25/25Duration 234 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±3m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Southern Öresund Surveillance Zone

🛰️ Satellite Corroboration

✗ SAR Not Available

No satellite imagery for this time/location

No Sentinel-1 scenes covering AOI and time window

Searched: 2026-10-24T19:45:12.096132+00:00

Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 477021600,
        "imo": 9747106,
        "name": "LIAN XI HU",
        "flag": "HONG KONG"
    },
    "vessel_b": {
        "mmsi": 636022165,
        "imo": 9943372,
        "name": "CL MARGARET MITCHELL",
        "flag": "LIBERIA"
    },
    "min_distance_m": 275.1000000000000227373675443232059478759765625,
    "avg_distance_m": 279.69999999999998863131622783839702606201171875,
    "distance_consistency_m": 2.70000000000000017763568394002504646778106689453125,
    "duration_minutes": 234,
    "overlap_duration_s": 14040,
    "speed_a_avg": 0.01000000000000000020816681711721685132943093776702880859375,
    "speed_a_std": 0.040000000000000000832667268468867405317723751068115234375,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.01000000000000000020816681711721685132943093776702880859375,
            "max_sog": 0.1000000000000000055511151231257827021181583404541015625
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-10-24T13:57:49+00:00",
        "end": "2026-10-24T17:51:49+00:00"
    },
    "points_count": {
        "vessel_a": 15,
        "vessel_b": 15
    },
    "zone_id": "discovered_003",
    "zone_name": "Southern \u00d6resund Surveillance Zone",
    "score": {
        "value": 85,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 275m, avg 280m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 234 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b13m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Southern \u00d6resund Surveillance Zone"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (LIAN XI HU and CL MARGARET MITCHELL) maintained close proximity (min 275m, avg 280m) for 234 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 Southern \u00d6resund Surveillance Zone, a known STS activity area."
    },
    "sar": {
        "status": "not_found",
        "centroid": {
            "lat": 37.16036559999999866477082832716405391693115234375,
            "lon": -6.8978666000000004032699507661163806915283203125
        },
        "time_window": {
            "start_ts": "2026-10-24T13:57:49+00:00",
            "end_ts": "2026-10-24T17:51:49+00:00"
        },
        "searched_at": "2026-10-24T19:45:12.096132+00:00",
        "notes": "No Sentinel-1 scenes covering AOI and time window"
    }
}
Methodology: 2026.01.18
Zone Dwell Southern Öresund Surveillance Zone
Oct 24, 2026 13:42 UTC 80.0% ▼
  • Zone: Southern Öresund Surveillance Zone
  • Duration: 6h 24m
  • Data Points: 24 AIS positions
  • Period: 2026-10-24T13:42:12+00:00 to 2026-10-24T20:06:12+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_003",
    "zone_name": "Southern \u00d6resund Surveillance Zone",
    "dwell_minutes": 384,
    "points_in_zone": 24,
    "first_point": {
        "ts": "2026-10-24T13:42:12+00:00",
        "lat": 37.15963169999999848869265406392514705657958984375,
        "lon": -6.89660829999999958062062432873062789440155029296875
    },
    "last_point": {
        "ts": "2026-10-24T20:06:12+00:00",
        "lat": 37.159615000000002282831701450049877166748046875,
        "lon": -6.896580000000000154614099301397800445556640625
    }
}
Methodology: 2026.01.18
Loiter Southern Öresund Surveillance Zone
Oct 24, 2026 13:42 UTC 75.0% ▼
  • Duration: 6h 24m
  • Radius: 7 meters
  • Data Points: 24 AIS positions
  • Centroid: 37.1596, -6.8966
  • Zone: Southern Öresund Surveillance Zone
Show Raw Evidence JSON
{
    "radius_m": 7.20000000000000017763568394002504646778106689453125,
    "duration_minutes": 384,
    "points": 24,
    "centroid": {
        "lat": 37.1596283291666651393825304694473743438720703125,
        "lon": -6.89659242916666670453196275047957897186279296875
    },
    "bbox": {
        "min_lat": 37.15956330000000207292032428085803985595703125,
        "min_lon": -6.89663170000000036452547647058963775634765625,
        "max_lat": 37.15968500000000318550519295968115329742431640625,
        "max_lon": -6.896551699999999840429154573939740657806396484375
    },
    "zone_id": "discovered_003"
}
Methodology: 2026.01.18
Sts Southern Öresund Surveillance Zone
Oct 24, 2026 13:36 UTC 85/100 ▼
Vessel A: IMO 9753686 (HAFNIA TOPAZ) MARSHALL ISLANDS
Vessel B: IMO 9943372 (CL MARGARET MITCHELL) LIBERIA
  • Minimum Distance: 244 meters
  • Average Distance: 251 meters
  • Duration: 2h 42m
  • Period: 2026-10-24T13:36:52+00:00 to 2026-10-24T16:18:52+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Southern Öresund Surveillance Zone

Confidence Analysis

Score: 85/100

High-confidence STS candidate. Two tankers (HAFNIA TOPAZ and CL MARGARET MITCHELL) maintained close proximity (min 244m, avg 251m) for 162 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 Southern Öresund Surveillance Zone, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness15/25Min distance 244m, avg 251m
Duration25/25Duration 162 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±4m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Southern Öresund Surveillance Zone
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 538006762,
        "imo": 9753686,
        "name": "HAFNIA TOPAZ",
        "flag": "MARSHALL ISLANDS"
    },
    "vessel_b": {
        "mmsi": 636022165,
        "imo": 9943372,
        "name": "CL MARGARET MITCHELL",
        "flag": "LIBERIA"
    },
    "min_distance_m": 244.099999999999994315658113919198513031005859375,
    "avg_distance_m": 251.099999999999994315658113919198513031005859375,
    "distance_consistency_m": 4.5,
    "duration_minutes": 162,
    "overlap_duration_s": 9720,
    "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": "2026-10-24T13:36:52+00:00",
        "end": "2026-10-24T16:18:52+00:00"
    },
    "points_count": {
        "vessel_a": 12,
        "vessel_b": 12
    },
    "zone_id": "discovered_003",
    "zone_name": "Southern \u00d6resund Surveillance Zone",
    "score": {
        "value": 85,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 244m, avg 251m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 162 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b14m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Southern \u00d6resund Surveillance Zone"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (HAFNIA TOPAZ and CL MARGARET MITCHELL) maintained close proximity (min 244m, avg 251m) for 162 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 Southern \u00d6resund Surveillance Zone, a known STS activity area."
    }
}
Methodology: 2026.01.18
Sts Southern Öresund Surveillance Zone
Oct 24, 2026 12:03 UTC 85/100 ▼
Vessel A: IMO 9747106 (LIAN XI HU) HONG KONG
Vessel B: IMO 9943372 (CL MARGARET MITCHELL) LIBERIA
  • Minimum Distance: 275 meters
  • Average Distance: 280 meters
  • Duration: 5h 48m
  • Period: 2026-10-24T12:03:49+00:00 to 2026-10-24T17:51:49+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Southern Öresund Surveillance Zone

Confidence Analysis

Score: 85/100

High-confidence STS candidate. Two tankers (LIAN XI HU and CL MARGARET MITCHELL) maintained close proximity (min 275m, avg 280m) for 348 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 Southern Öresund Surveillance Zone, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness15/25Min distance 275m, avg 280m
Duration25/25Duration 348 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±3m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Southern Öresund Surveillance Zone
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 477021600,
        "imo": 9747106,
        "name": "LIAN XI HU",
        "flag": "HONG KONG"
    },
    "vessel_b": {
        "mmsi": 636022165,
        "imo": 9943372,
        "name": "CL MARGARET MITCHELL",
        "flag": "LIBERIA"
    },
    "min_distance_m": 275.1000000000000227373675443232059478759765625,
    "avg_distance_m": 280.19999999999998863131622783839702606201171875,
    "distance_consistency_m": 2.600000000000000088817841970012523233890533447265625,
    "duration_minutes": 348,
    "overlap_duration_s": 20880,
    "speed_a_avg": 0.01000000000000000020816681711721685132943093776702880859375,
    "speed_a_std": 0.0299999999999999988897769753748434595763683319091796875,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.01000000000000000020816681711721685132943093776702880859375,
            "max_sog": 0.1000000000000000055511151231257827021181583404541015625
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-10-24T12:03:49+00:00",
        "end": "2026-10-24T17:51:49+00:00"
    },
    "points_count": {
        "vessel_a": 19,
        "vessel_b": 19
    },
    "zone_id": "discovered_003",
    "zone_name": "Southern \u00d6resund Surveillance Zone",
    "score": {
        "value": 85,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 275m, avg 280m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 348 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b13m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Southern \u00d6resund Surveillance Zone"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (LIAN XI HU and CL MARGARET MITCHELL) maintained close proximity (min 275m, avg 280m) for 348 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 Southern \u00d6resund Surveillance Zone, a known STS activity area."
    }
}
Methodology: 2026.01.18
Sts🛰️✗ Southern Öresund Surveillance Zone
Oct 24, 2026 12:00 UTC 85/100 ▼
Vessel A: IMO 9943372 (CL MARGARET MITCHELL) LIBERIA
Vessel B: IMO 9753686 (HAFNIA TOPAZ) MARSHALL ISLANDS
  • Minimum Distance: 244 meters
  • Average Distance: 249 meters
  • Duration: 2h 18m
  • Period: 2026-10-24T12:00:12+00:00 to 2026-10-24T14:18:13+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Southern Öresund Surveillance Zone

Confidence Analysis

Score: 85/100

High-confidence STS candidate. Two tankers (CL MARGARET MITCHELL and HAFNIA TOPAZ) maintained close proximity (min 244m, avg 249m) for 138 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 Southern Öresund Surveillance Zone, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness15/25Min distance 244m, avg 249m
Duration25/25Duration 138 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±4m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Southern Öresund Surveillance Zone

🛰️ Satellite Corroboration

✗ SAR Not Available

No satellite imagery for this time/location

No Sentinel-1 scenes covering AOI and time window

Searched: 2026-10-24T18:00:02.283392+00:00

Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 636022165,
        "imo": 9943372,
        "name": "CL MARGARET MITCHELL",
        "flag": "LIBERIA"
    },
    "vessel_b": {
        "mmsi": 538006762,
        "imo": 9753686,
        "name": "HAFNIA TOPAZ",
        "flag": "MARSHALL ISLANDS"
    },
    "min_distance_m": 244,
    "avg_distance_m": 248.69999999999998863131622783839702606201171875,
    "distance_consistency_m": 3.600000000000000088817841970012523233890533447265625,
    "duration_minutes": 138,
    "overlap_duration_s": 8281,
    "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": "2026-10-24T12:00:12+00:00",
        "end": "2026-10-24T14:18:13+00:00"
    },
    "points_count": {
        "vessel_a": 8,
        "vessel_b": 8
    },
    "zone_id": "discovered_003",
    "zone_name": "Southern \u00d6resund Surveillance Zone",
    "score": {
        "value": 85,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 244m, avg 249m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 138 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b14m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Southern \u00d6resund Surveillance Zone"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (CL MARGARET MITCHELL and HAFNIA TOPAZ) maintained close proximity (min 244m, avg 249m) for 138 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 Southern \u00d6resund Surveillance Zone, a known STS activity area."
    },
    "sar": {
        "status": "not_found",
        "centroid": {
            "lat": 37.158958699999999453211785294115543365478515625,
            "lon": -6.8954643000000004349203663878142833709716796875
        },
        "time_window": {
            "start_ts": "2026-10-24T12:00:12+00:00",
            "end_ts": "2026-10-24T14:18:13+00:00"
        },
        "searched_at": "2026-10-24T18:00:02.283392+00:00",
        "notes": "No Sentinel-1 scenes covering AOI and time window"
    }
}
Methodology: 2026.01.18
Zone Dwell Southern Öresund Surveillance Zone
Oct 24, 2026 12:00 UTC 80.0% ▼
  • Zone: Southern Öresund Surveillance Zone
  • Duration: 6h 30m
  • Data Points: 22 AIS positions
  • Period: 2026-10-24T12:42:12+00:00 to 2026-10-24T19:12:12+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_003",
    "zone_name": "Southern \u00d6resund Surveillance Zone",
    "dwell_minutes": 390,
    "points_in_zone": 22,
    "first_point": {
        "ts": "2026-10-24T12:42:12+00:00",
        "lat": 37.1596167000000008329152478836476802825927734375,
        "lon": -6.8966200000000004166622602497227489948272705078125
    },
    "last_point": {
        "ts": "2026-10-24T19:12:12+00:00",
        "lat": 37.1596667000000024927430786192417144775390625,
        "lon": -6.896551699999999840429154573939740657806396484375
    }
}
Methodology: 2026.01.18
Loiter Southern Öresund Surveillance Zone
Oct 24, 2026 12:00 UTC 75.0% ▼
  • Duration: 6h 30m
  • Radius: 7 meters
  • Data Points: 22 AIS positions
  • Centroid: 37.1596, -6.8966
  • Zone: Southern Öresund Surveillance Zone
Show Raw Evidence JSON
{
    "radius_m": 7.4000000000000003552713678800500929355621337890625,
    "duration_minutes": 390,
    "points": 22,
    "centroid": {
        "lat": 37.159629390909088897387846373021602630615234375,
        "lon": -6.89659568181818105614411251735873520374298095703125
    },
    "bbox": {
        "min_lat": 37.15956330000000207292032428085803985595703125,
        "min_lon": -6.89663170000000036452547647058963775634765625,
        "max_lat": 37.15968500000000318550519295968115329742431640625,
        "max_lon": -6.896551699999999840429154573939740657806396484375
    },
    "zone_id": "discovered_003"
}
Methodology: 2026.01.18
Sts Southern Öresund Surveillance Zone
Oct 24, 2026 11:54 UTC 85/100 ▼
Vessel A: IMO 9943372 (CL MARGARET MITCHELL) LIBERIA
Vessel B: IMO 9753686 (HAFNIA TOPAZ) MARSHALL ISLANDS
  • Minimum Distance: 244 meters
  • Average Distance: 248 meters
  • Duration: 3 hours
  • Period: 2026-10-24T11:18:12+00:00 to 2026-10-24T14:18:13+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Southern Öresund Surveillance Zone

Confidence Analysis

Score: 85/100

High-confidence STS candidate. Two tankers (CL MARGARET MITCHELL and HAFNIA TOPAZ) maintained close proximity (min 244m, avg 248m) for 180 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 Southern Öresund Surveillance Zone, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness15/25Min distance 244m, avg 248m
Duration25/25Duration 180 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±3m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Southern Öresund Surveillance Zone
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 636022165,
        "imo": 9943372,
        "name": "CL MARGARET MITCHELL",
        "flag": "LIBERIA"
    },
    "vessel_b": {
        "mmsi": 538006762,
        "imo": 9753686,
        "name": "HAFNIA TOPAZ",
        "flag": "MARSHALL ISLANDS"
    },
    "min_distance_m": 244,
    "avg_distance_m": 248.400000000000005684341886080801486968994140625,
    "distance_consistency_m": 3.399999999999999911182158029987476766109466552734375,
    "duration_minutes": 180,
    "overlap_duration_s": 10801,
    "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": "2026-10-24T11:18:12+00:00",
        "end": "2026-10-24T14:18:13+00:00"
    },
    "points_count": {
        "vessel_a": 10,
        "vessel_b": 10
    },
    "zone_id": "discovered_003",
    "zone_name": "Southern \u00d6resund Surveillance Zone",
    "score": {
        "value": 85,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 244m, avg 248m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 180 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b13m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Southern \u00d6resund Surveillance Zone"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (CL MARGARET MITCHELL and HAFNIA TOPAZ) maintained close proximity (min 244m, avg 248m) for 180 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 Southern \u00d6resund Surveillance Zone, a known STS activity area."
    }
}
Methodology: 2026.01.18
Sts Southern Öresund Surveillance Zone
Oct 24, 2026 11:21 UTC 85/100 ▼
Vessel A: IMO 9747106 (LIAN XI HU) HONG KONG
Vessel B: IMO 9943372 (CL MARGARET MITCHELL) LIBERIA
  • Minimum Distance: 275 meters
  • Average Distance: 281 meters
  • Duration: 5h 48m
  • Period: 2026-10-24T11:21:49+00:00 to 2026-10-24T17:09:49+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Southern Öresund Surveillance Zone

Confidence Analysis

Score: 85/100

High-confidence STS candidate. Two tankers (LIAN XI HU and CL MARGARET MITCHELL) maintained close proximity (min 275m, avg 281m) for 348 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 Southern Öresund Surveillance Zone, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness15/25Min distance 275m, avg 281m
Duration25/25Duration 348 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±3m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Southern Öresund Surveillance Zone
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 477021600,
        "imo": 9747106,
        "name": "LIAN XI HU",
        "flag": "HONG KONG"
    },
    "vessel_b": {
        "mmsi": 636022165,
        "imo": 9943372,
        "name": "CL MARGARET MITCHELL",
        "flag": "LIBERIA"
    },
    "min_distance_m": 275.1000000000000227373675443232059478759765625,
    "avg_distance_m": 281.19999999999998863131622783839702606201171875,
    "distance_consistency_m": 3,
    "duration_minutes": 348,
    "overlap_duration_s": 20880,
    "speed_a_avg": 0.01000000000000000020816681711721685132943093776702880859375,
    "speed_a_std": 0.0299999999999999988897769753748434595763683319091796875,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.01000000000000000020816681711721685132943093776702880859375,
            "max_sog": 0.1000000000000000055511151231257827021181583404541015625
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-10-24T11:21:49+00:00",
        "end": "2026-10-24T17:09:49+00:00"
    },
    "points_count": {
        "vessel_a": 20,
        "vessel_b": 20
    },
    "zone_id": "discovered_003",
    "zone_name": "Southern \u00d6resund Surveillance Zone",
    "score": {
        "value": 85,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 275m, avg 281m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 348 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b13m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Southern \u00d6resund Surveillance Zone"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (LIAN XI HU and CL MARGARET MITCHELL) maintained close proximity (min 275m, avg 281m) for 348 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 Southern \u00d6resund Surveillance Zone, a known STS activity area."
    }
}
Methodology: 2026.01.18
Zone Dwell Southern Öresund Surveillance Zone
Oct 24, 2026 11:18 UTC 80.0% ▼
  • Zone: Southern Öresund Surveillance Zone
  • Duration: 6h 24m
  • Data Points: 24 AIS positions
  • Period: 2026-10-24T11:18:12+00:00 to 2026-10-24T17:42:12+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_003",
    "zone_name": "Southern \u00d6resund Surveillance Zone",
    "dwell_minutes": 384,
    "points_in_zone": 24,
    "first_point": {
        "ts": "2026-10-24T11:18:12+00:00",
        "lat": 37.1596100000000006957634468562901020050048828125,
        "lon": -6.89660500000000009634959496906958520412445068359375
    },
    "last_point": {
        "ts": "2026-10-24T17:42:12+00:00",
        "lat": 37.15963500000000152567736222408711910247802734375,
        "lon": -6.8965750000000003439026841078884899616241455078125
    }
}
Methodology: 2026.01.18
Loiter Southern Öresund Surveillance Zone
Oct 24, 2026 11:18 UTC 75.0% ▼
  • Duration: 6h 24m
  • Radius: 7 meters
  • Data Points: 24 AIS positions
  • Centroid: 37.1596, -6.8966
  • Zone: Southern Öresund Surveillance Zone
Show Raw Evidence JSON
{
    "radius_m": 6.9000000000000003552713678800500929355621337890625,
    "duration_minutes": 384,
    "points": 24,
    "centroid": {
        "lat": 37.15962672916666775790872634388506412506103515625,
        "lon": -6.896598541666666193350465619005262851715087890625
    },
    "bbox": {
        "min_lat": 37.15958830000000290283423964865505695343017578125,
        "min_lon": -6.89663170000000036452547647058963775634765625,
        "max_lat": 37.15968500000000318550519295968115329742431640625,
        "max_lon": -6.89656000000000002359001882723532617092132568359375
    },
    "zone_id": "discovered_003"
}
Methodology: 2026.01.18
Sts Southern Öresund Surveillance Zone
Oct 24, 2026 10:36 UTC 85/100 ▼
Vessel A: IMO 9943372 (CL MARGARET MITCHELL) LIBERIA
Vessel B: IMO 9747106 (LIAN XI HU) HONG KONG
  • Minimum Distance: 275 meters
  • Average Distance: 282 meters
  • Duration: 3h 30m
  • Period: 2026-10-24T10:36:12+00:00 to 2026-10-24T14:06:12+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Southern Öresund Surveillance Zone

Confidence Analysis

Score: 85/100

High-confidence STS candidate. Two tankers (CL MARGARET MITCHELL and LIAN XI HU) maintained close proximity (min 275m, avg 282m) for 210 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 Southern Öresund Surveillance Zone, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness15/25Min distance 275m, avg 282m
Duration25/25Duration 210 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±3m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Southern Öresund Surveillance Zone
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 636022165,
        "imo": 9943372,
        "name": "CL MARGARET MITCHELL",
        "flag": "LIBERIA"
    },
    "vessel_b": {
        "mmsi": 477021600,
        "imo": 9747106,
        "name": "LIAN XI HU",
        "flag": "HONG KONG"
    },
    "min_distance_m": 275.1000000000000227373675443232059478759765625,
    "avg_distance_m": 282,
    "distance_consistency_m": 3.100000000000000088817841970012523233890533447265625,
    "duration_minutes": 210,
    "overlap_duration_s": 12600,
    "speed_a_avg": 0,
    "speed_a_std": 0,
    "speed_b_avg": 0.01000000000000000020816681711721685132943093776702880859375,
    "speed_b_std": 0.0299999999999999988897769753748434595763683319091796875,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0,
            "max_sog": 0
        },
        "vessel_b": {
            "avg_sog": 0.01000000000000000020816681711721685132943093776702880859375,
            "max_sog": 0.1000000000000000055511151231257827021181583404541015625
        }
    },
    "time_window": {
        "start": "2026-10-24T10:36:12+00:00",
        "end": "2026-10-24T14:06:12+00:00"
    },
    "points_count": {
        "vessel_a": 11,
        "vessel_b": 11
    },
    "zone_id": "discovered_003",
    "zone_name": "Southern \u00d6resund Surveillance Zone",
    "score": {
        "value": 85,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 275m, avg 282m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 210 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b13m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Southern \u00d6resund Surveillance Zone"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (CL MARGARET MITCHELL and LIAN XI HU) maintained close proximity (min 275m, avg 282m) for 210 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 Southern \u00d6resund Surveillance Zone, a known STS activity area."
    }
}
Methodology: 2026.01.18
Zone Dwell Southern Öresund Surveillance Zone
Oct 24, 2026 10:06 UTC 80.0% ▼
  • Zone: Southern Öresund Surveillance Zone
  • Duration: 6h 24m
  • Data Points: 23 AIS positions
  • Period: 2026-10-24T10:36:12+00:00 to 2026-10-24T17:00:12+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_003",
    "zone_name": "Southern \u00d6resund Surveillance Zone",
    "dwell_minutes": 384,
    "points_in_zone": 23,
    "first_point": {
        "ts": "2026-10-24T10:36:12+00:00",
        "lat": 37.1595999999999975216269376687705516815185546875,
        "lon": -6.896596699999999913188730715773999691009521484375
    },
    "last_point": {
        "ts": "2026-10-24T17:00:12+00:00",
        "lat": 37.1596449999999975943865138106048107147216796875,
        "lon": -6.8965782999999998281737134675495326519012451171875
    }
}
Methodology: 2026.01.18
Loiter Southern Öresund Surveillance Zone
Oct 24, 2026 10:06 UTC 75.0% ▼
  • Duration: 6h 24m
  • Radius: 5 meters
  • Data Points: 23 AIS positions
  • Centroid: 37.1596, -6.8966
  • Zone: Southern Öresund Surveillance Zone
Show Raw Evidence JSON
{
    "radius_m": 4.70000000000000017763568394002504646778106689453125,
    "duration_minutes": 384,
    "points": 23,
    "centroid": {
        "lat": 37.15962006521738913988883723504841327667236328125,
        "lon": -6.89659680869565061556158980238251388072967529296875
    },
    "bbox": {
        "min_lat": 37.15958830000000290283423964865505695343017578125,
        "min_lon": -6.8966200000000004166622602497227489948272705078125,
        "max_lat": 37.1596617000000009056748240254819393157958984375,
        "max_lon": -6.89656000000000002359001882723532617092132568359375
    },
    "zone_id": "discovered_003"
}
Methodology: 2026.01.18
Sts Southern Öresund Surveillance Zone
Oct 24, 2026 10:01 UTC 85/100 ▼
Vessel A: IMO 9943372 (CL MARGARET MITCHELL) LIBERIA
Vessel B: IMO 9753686 (HAFNIA TOPAZ) MARSHALL ISLANDS
  • Minimum Distance: 244 meters
  • Average Distance: 248 meters
  • Duration: 3h 36m
  • Period: 2026-10-24T10:42:12+00:00 to 2026-10-24T14:18:13+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Southern Öresund Surveillance Zone

Confidence Analysis

Score: 85/100

High-confidence STS candidate. Two tankers (CL MARGARET MITCHELL and HAFNIA TOPAZ) maintained close proximity (min 244m, avg 248m) for 216 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 Southern Öresund Surveillance Zone, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness15/25Min distance 244m, avg 248m
Duration25/25Duration 216 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±3m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Southern Öresund Surveillance Zone
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 636022165,
        "imo": 9943372,
        "name": "CL MARGARET MITCHELL",
        "flag": "LIBERIA"
    },
    "vessel_b": {
        "mmsi": 538006762,
        "imo": 9753686,
        "name": "HAFNIA TOPAZ",
        "flag": "MARSHALL ISLANDS"
    },
    "min_distance_m": 244,
    "avg_distance_m": 248.400000000000005684341886080801486968994140625,
    "distance_consistency_m": 3.20000000000000017763568394002504646778106689453125,
    "duration_minutes": 216,
    "overlap_duration_s": 12961,
    "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": "2026-10-24T10:42:12+00:00",
        "end": "2026-10-24T14:18:13+00:00"
    },
    "points_count": {
        "vessel_a": 11,
        "vessel_b": 11
    },
    "zone_id": "discovered_003",
    "zone_name": "Southern \u00d6resund Surveillance Zone",
    "score": {
        "value": 85,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 244m, avg 248m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 216 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b13m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Southern \u00d6resund Surveillance Zone"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (CL MARGARET MITCHELL and HAFNIA TOPAZ) maintained close proximity (min 244m, avg 248m) for 216 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 Southern \u00d6resund Surveillance Zone, a known STS activity area."
    }
}
Methodology: 2026.01.18
Sts Southern Öresund Surveillance Zone
Oct 24, 2026 09:54 UTC 85/100 ▼
Vessel A: IMO 9943372 (CL MARGARET MITCHELL) LIBERIA
Vessel B: IMO 9753686 (HAFNIA TOPAZ) MARSHALL ISLANDS
  • Minimum Distance: 244 meters
  • Average Distance: 256 meters
  • Duration: 4h 24m
  • Period: 2026-10-24T09:54:12+00:00 to 2026-10-24T14:18:13+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.1 knots
  • Zone: Southern Öresund Surveillance Zone

Confidence Analysis

Score: 85/100

High-confidence STS candidate. Two tankers (CL MARGARET MITCHELL and HAFNIA TOPAZ) maintained close proximity (min 244m, avg 256m) for 264 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.1 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Southern Öresund Surveillance Zone, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness15/25Min distance 244m, avg 256m
Duration25/25Duration 264 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±19m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Southern Öresund Surveillance Zone
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 636022165,
        "imo": 9943372,
        "name": "CL MARGARET MITCHELL",
        "flag": "LIBERIA"
    },
    "vessel_b": {
        "mmsi": 538006762,
        "imo": 9753686,
        "name": "HAFNIA TOPAZ",
        "flag": "MARSHALL ISLANDS"
    },
    "min_distance_m": 244,
    "avg_distance_m": 255.599999999999994315658113919198513031005859375,
    "distance_consistency_m": 19,
    "duration_minutes": 264,
    "overlap_duration_s": 15841,
    "speed_a_avg": 0,
    "speed_a_std": 0,
    "speed_b_avg": 0.070000000000000006661338147750939242541790008544921875,
    "speed_b_std": 0.179999999999999993338661852249060757458209991455078125,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0,
            "max_sog": 0
        },
        "vessel_b": {
            "avg_sog": 0.070000000000000006661338147750939242541790008544921875,
            "max_sog": 0.5
        }
    },
    "time_window": {
        "start": "2026-10-24T09:54:12+00:00",
        "end": "2026-10-24T14:18:13+00:00"
    },
    "points_count": {
        "vessel_a": 15,
        "vessel_b": 15
    },
    "zone_id": "discovered_003",
    "zone_name": "Southern \u00d6resund Surveillance Zone",
    "score": {
        "value": 85,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 244m, avg 256m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 264 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b119m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Southern \u00d6resund Surveillance Zone"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (CL MARGARET MITCHELL and HAFNIA TOPAZ) maintained close proximity (min 244m, avg 256m) for 264 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.1 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Southern \u00d6resund Surveillance Zone, a known STS activity area."
    }
}
Methodology: 2026.01.18
Zone Dwell Southern Öresund Surveillance Zone
Oct 24, 2026 09:18 UTC 80.0% ▼
  • Zone: Southern Öresund Surveillance Zone
  • Duration: 6h 18m
  • Data Points: 24 AIS positions
  • Period: 2026-10-24T09:54:12+00:00 to 2026-10-24T16:12:12+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_003",
    "zone_name": "Southern \u00d6resund Surveillance Zone",
    "dwell_minutes": 378,
    "points_in_zone": 24,
    "first_point": {
        "ts": "2026-10-24T09:54:12+00:00",
        "lat": 37.15961999999999676447259844280779361724853515625,
        "lon": -6.89659829999999995919779394171200692653656005859375
    },
    "last_point": {
        "ts": "2026-10-24T16:12:12+00:00",
        "lat": 37.159598299999998971543391235172748565673828125,
        "lon": -6.89656000000000002359001882723532617092132568359375
    }
}
Methodology: 2026.01.18
Loiter Southern Öresund Surveillance Zone
Oct 24, 2026 09:18 UTC 75.0% ▼
  • Duration: 6h 18m
  • Radius: 5 meters
  • Data Points: 24 AIS positions
  • Centroid: 37.1596, -6.8966
  • Zone: Southern Öresund Surveillance Zone
Show Raw Evidence JSON
{
    "radius_m": 5.0999999999999996447286321199499070644378662109375,
    "duration_minutes": 378,
    "points": 24,
    "centroid": {
        "lat": 37.1596167999999948960976325906813144683837890625,
        "lon": -6.89659819166666654410846604150719940662384033203125
    },
    "bbox": {
        "min_lat": 37.15958330000000131576598505489528179168701171875,
        "min_lon": -6.8966200000000004166622602497227489948272705078125,
        "max_lat": 37.1596617000000009056748240254819393157958984375,
        "max_lon": -6.89656000000000002359001882723532617092132568359375
    },
    "zone_id": "discovered_003"
}
Methodology: 2026.01.18
Sts Southern Öresund Surveillance Zone
Oct 24, 2026 08:39 UTC 85/100 ▼
Vessel A: IMO 9747106 (LIAN XI HU) HONG KONG
Vessel B: IMO 9943372 (CL MARGARET MITCHELL) LIBERIA
  • Minimum Distance: 278 meters
  • Average Distance: 283 meters
  • Duration: 2h 12m
  • Period: 2026-10-24T08:39:49+00:00 to 2026-10-24T10:51:49+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Southern Öresund Surveillance Zone

Confidence Analysis

Score: 85/100

High-confidence STS candidate. Two tankers (LIAN XI HU and CL MARGARET MITCHELL) maintained close proximity (min 278m, avg 283m) for 132 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 Southern Öresund Surveillance Zone, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness15/25Min distance 278m, avg 283m
Duration25/25Duration 132 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±3m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Southern Öresund Surveillance Zone
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 477021600,
        "imo": 9747106,
        "name": "LIAN XI HU",
        "flag": "HONG KONG"
    },
    "vessel_b": {
        "mmsi": 636022165,
        "imo": 9943372,
        "name": "CL MARGARET MITCHELL",
        "flag": "LIBERIA"
    },
    "min_distance_m": 277.8999999999999772626324556767940521240234375,
    "avg_distance_m": 283,
    "distance_consistency_m": 3.100000000000000088817841970012523233890533447265625,
    "duration_minutes": 132,
    "overlap_duration_s": 7920,
    "speed_a_avg": 0.040000000000000000832667268468867405317723751068115234375,
    "speed_a_std": 0.05000000000000000277555756156289135105907917022705078125,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.040000000000000000832667268468867405317723751068115234375,
            "max_sog": 0.1000000000000000055511151231257827021181583404541015625
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-10-24T08:39:49+00:00",
        "end": "2026-10-24T10:51:49+00:00"
    },
    "points_count": {
        "vessel_a": 7,
        "vessel_b": 7
    },
    "zone_id": "discovered_003",
    "zone_name": "Southern \u00d6resund Surveillance Zone",
    "score": {
        "value": 85,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 278m, avg 283m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 132 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b13m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Southern \u00d6resund Surveillance Zone"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (LIAN XI HU and CL MARGARET MITCHELL) maintained close proximity (min 278m, avg 283m) for 132 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 Southern \u00d6resund Surveillance Zone, a known STS activity area."
    }
}
Methodology: 2026.01.18
Zone Dwell Southern Öresund Surveillance Zone
Oct 24, 2026 08:30 UTC 80.0% ▼
  • Zone: Southern Öresund Surveillance Zone
  • Duration: 6h 30m
  • Data Points: 22 AIS positions
  • Period: 2026-10-24T08:54:12+00:00 to 2026-10-24T15:24:12+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_003",
    "zone_name": "Southern \u00d6resund Surveillance Zone",
    "dwell_minutes": 390,
    "points_in_zone": 22,
    "first_point": {
        "ts": "2026-10-24T08:54:12+00:00",
        "lat": 37.15960499999999910869519226253032684326171875,
        "lon": -6.8965782999999998281737134675495326519012451171875
    },
    "last_point": {
        "ts": "2026-10-24T15:24:12+00:00",
        "lat": 37.15961829999999821438905200920999050140380859375,
        "lon": -6.89660500000000009634959496906958520412445068359375
    }
}
Methodology: 2026.01.18
Loiter Southern Öresund Surveillance Zone
Oct 24, 2026 08:30 UTC 75.0% ▼
  • Duration: 6h 30m
  • Radius: 5 meters
  • Data Points: 22 AIS positions
  • Centroid: 37.1596, -6.8966
  • Zone: Southern Öresund Surveillance Zone
Show Raw Evidence JSON
{
    "radius_m": 5.0999999999999996447286321199499070644378662109375,
    "duration_minutes": 390,
    "points": 22,
    "centroid": {
        "lat": 37.159615981818177488094079308211803436279296875,
        "lon": -6.89659954090909099733153198030777275562286376953125
    },
    "bbox": {
        "min_lat": 37.15958330000000131576598505489528179168701171875,
        "min_lon": -6.8966200000000004166622602497227489948272705078125,
        "max_lat": 37.1596617000000009056748240254819393157958984375,
        "max_lon": -6.89657330000000001746229827404022216796875
    },
    "zone_id": "discovered_003"
}
Methodology: 2026.01.18
Zone Dwell Southern Öresund Surveillance Zone
Oct 24, 2026 07:24 UTC 80.0% ▼
  • Zone: Southern Öresund Surveillance Zone
  • Duration: 6h 18m
  • Data Points: 17 AIS positions
  • Period: 2026-10-24T07:24:12+00:00 to 2026-10-24T13:42:12+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_003",
    "zone_name": "Southern \u00d6resund Surveillance Zone",
    "dwell_minutes": 378,
    "points_in_zone": 17,
    "first_point": {
        "ts": "2026-10-24T07:24:12+00:00",
        "lat": 37.1596100000000006957634468562901020050048828125,
        "lon": -6.89660999999999990706101016257889568805694580078125
    },
    "last_point": {
        "ts": "2026-10-24T13:42:12+00:00",
        "lat": 37.15963169999999848869265406392514705657958984375,
        "lon": -6.89660829999999958062062432873062789440155029296875
    }
}
Methodology: 2026.01.18
Loiter Southern Öresund Surveillance Zone
Oct 24, 2026 07:24 UTC 75.0% ▼
  • Duration: 6h 18m
  • Radius: 4 meters
  • Data Points: 17 AIS positions
  • Centroid: 37.1596, -6.8966
  • Zone: Southern Öresund Surveillance Zone
Show Raw Evidence JSON
{
    "radius_m": 3.5,
    "duration_minutes": 378,
    "points": 17,
    "centroid": {
        "lat": 37.1596100000000006957634468562901020050048828125,
        "lon": -6.89659519411764687646382299135439097881317138671875
    },
    "bbox": {
        "min_lat": 37.15958330000000131576598505489528179168701171875,
        "min_lon": -6.8966200000000004166622602497227489948272705078125,
        "max_lat": 37.15963169999999848869265406392514705657958984375,
        "max_lon": -6.8965566999999996511405697674490511417388916015625
    },
    "zone_id": "discovered_003"
}
Methodology: 2026.01.18
Zone Dwell Southern Öresund Surveillance Zone
Oct 24, 2026 06:36 UTC 80.0% ▼
  • Zone: Southern Öresund Surveillance Zone
  • Duration: 6h 12m
  • Data Points: 19 AIS positions
  • Period: 2026-10-24T06:36:12+00:00 to 2026-10-24T12:48:12+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_003",
    "zone_name": "Southern \u00d6resund Surveillance Zone",
    "dwell_minutes": 372,
    "points_in_zone": 19,
    "first_point": {
        "ts": "2026-10-24T06:36:12+00:00",
        "lat": 37.1596382999999974572347127832472324371337890625,
        "lon": -6.8966133000000002795104592223651707172393798828125
    },
    "last_point": {
        "ts": "2026-10-24T12:48:12+00:00",
        "lat": 37.1596100000000006957634468562901020050048828125,
        "lon": -6.8965917000000001024773155222646892070770263671875
    }
}
Methodology: 2026.01.18
Loiter Southern Öresund Surveillance Zone
Oct 24, 2026 06:36 UTC 75.0% ▼
  • Duration: 6h 12m
  • Radius: 4 meters
  • Data Points: 19 AIS positions
  • Centroid: 37.1596, -6.8966
  • Zone: Southern Öresund Surveillance Zone
Show Raw Evidence JSON
{
    "radius_m": 3.70000000000000017763568394002504646778106689453125,
    "duration_minutes": 372,
    "points": 19,
    "centroid": {
        "lat": 37.1596117526315907753087230958044528961181640625,
        "lon": -6.89659639999999996007318259216845035552978515625
    },
    "bbox": {
        "min_lat": 37.15958330000000131576598505489528179168701171875,
        "min_lon": -6.8966200000000004166622602497227489948272705078125,
        "max_lat": 37.1596382999999974572347127832472324371337890625,
        "max_lon": -6.8965566999999996511405697674490511417388916015625
    },
    "zone_id": "discovered_003"
}
Methodology: 2026.01.18
Sts🛰️✗ Southern Öresund Surveillance Zone
Oct 24, 2026 05:18 UTC 80/100 ▼
Vessel A: IMO 9943372 (CL MARGARET MITCHELL) LIBERIA
Vessel B: IMO 9747106 (LIAN XI HU) HONG KONG
  • Minimum Distance: 279 meters
  • Average Distance: 283 meters
  • Duration: 1h 30m
  • Period: 2026-10-24T05:18:12+00:00 to 2026-10-24T06:48:12+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Southern Öresund Surveillance Zone

Confidence Analysis

Score: 80/100

High-confidence STS candidate. Two tankers (CL MARGARET MITCHELL and LIAN XI HU) maintained close proximity (min 278m, avg 283m) for 90 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 Southern Öresund Surveillance Zone, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness15/25Min distance 278m, avg 283m
Duration20/25Duration 90 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±2m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Southern Öresund Surveillance Zone

🛰️ Satellite Corroboration

✗ SAR Not Available

No satellite imagery for this time/location

No Sentinel-1 scenes covering AOI and time window

Searched: 2026-10-24T11:30:01.540484+00:00

Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 636022165,
        "imo": 9943372,
        "name": "CL MARGARET MITCHELL",
        "flag": "LIBERIA"
    },
    "vessel_b": {
        "mmsi": 477021600,
        "imo": 9747106,
        "name": "LIAN XI HU",
        "flag": "HONG KONG"
    },
    "min_distance_m": 278.5,
    "avg_distance_m": 283.30000000000001136868377216160297393798828125,
    "distance_consistency_m": 2.5,
    "duration_minutes": 90,
    "overlap_duration_s": 5400,
    "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": "2026-10-24T05:18:12+00:00",
        "end": "2026-10-24T06:48:12+00:00"
    },
    "points_count": {
        "vessel_a": 7,
        "vessel_b": 7
    },
    "zone_id": "discovered_003",
    "zone_name": "Southern \u00d6resund Surveillance Zone",
    "score": {
        "value": 80,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 278m, avg 283m"
            },
            "duration": {
                "score": 20,
                "max": 25,
                "detail": "Duration 90 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: Southern \u00d6resund Surveillance Zone"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (CL MARGARET MITCHELL and LIAN XI HU) maintained close proximity (min 278m, avg 283m) for 90 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 Southern \u00d6resund Surveillance Zone, a known STS activity area."
    },
    "sar": {
        "status": "not_found",
        "centroid": {
            "lat": 37.1603630999999978712367010302841663360595703125,
            "lon": -6.89787589999999983803036229801364243030548095703125
        },
        "time_window": {
            "start_ts": "2026-10-24T05:18:12+00:00",
            "end_ts": "2026-10-24T06:48:12+00:00"
        },
        "searched_at": "2026-10-24T11:30:01.540484+00:00",
        "notes": "No Sentinel-1 scenes covering AOI and time window"
    }
}
Methodology: 2026.01.18
Zone Dwell Southern Öresund Surveillance Zone
Oct 24, 2026 05:00 UTC 80.0% ▼
  • Zone: Southern Öresund Surveillance Zone
  • Duration: 6h 24m
  • Data Points: 19 AIS positions
  • Period: 2026-10-24T05:48:12+00:00 to 2026-10-24T12:12:12+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_003",
    "zone_name": "Southern \u00d6resund Surveillance Zone",
    "dwell_minutes": 384,
    "points_in_zone": 19,
    "first_point": {
        "ts": "2026-10-24T05:48:12+00:00",
        "lat": 37.15959670000000159006958710961043834686279296875,
        "lon": -6.89657669999999978216465024161152541637420654296875
    },
    "last_point": {
        "ts": "2026-10-24T12:12:12+00:00",
        "lat": 37.159615000000002282831701450049877166748046875,
        "lon": -6.89660670000000042278998080291785299777984619140625
    }
}
Methodology: 2026.01.18
Loiter Southern Öresund Surveillance Zone
Oct 24, 2026 05:00 UTC 75.0% ▼
  • Duration: 6h 24m
  • Radius: 6 meters
  • Data Points: 19 AIS positions
  • Centroid: 37.1596, -6.8966
  • Zone: Southern Öresund Surveillance Zone
Show Raw Evidence JSON
{
    "radius_m": 5.5,
    "duration_minutes": 384,
    "points": 19,
    "centroid": {
        "lat": 37.15960842105264561041622073389589786529541015625,
        "lon": -6.8965924526315784959251686814241111278533935546875
    },
    "bbox": {
        "min_lat": 37.159566699999999173087417148053646087646484375,
        "min_lon": -6.8966133000000002795104592223651707172393798828125,
        "max_lat": 37.1596382999999974572347127832472324371337890625,
        "max_lon": -6.8965566999999996511405697674490511417388916015625
    },
    "zone_id": "discovered_003"
}
Methodology: 2026.01.18
Sts Southern Öresund Surveillance Zone
Oct 24, 2026 04:39 UTC 85/100 ▼
Vessel A: IMO 9943372 (CL MARGARET MITCHELL) LIBERIA
Vessel B: IMO 9747106 (LIAN XI HU) HONG KONG
  • Minimum Distance: 279 meters
  • Average Distance: 284 meters
  • Duration: 2h 6m
  • Period: 2026-10-24T04:42:12+00:00 to 2026-10-24T06:48:12+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Southern Öresund Surveillance Zone

Confidence Analysis

Score: 85/100

High-confidence STS candidate. Two tankers (CL MARGARET MITCHELL and LIAN XI HU) maintained close proximity (min 278m, avg 284m) 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 Southern Öresund Surveillance Zone, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness15/25Min distance 278m, avg 284m
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: Southern Öresund Surveillance Zone
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 636022165,
        "imo": 9943372,
        "name": "CL MARGARET MITCHELL",
        "flag": "LIBERIA"
    },
    "vessel_b": {
        "mmsi": 477021600,
        "imo": 9747106,
        "name": "LIAN XI HU",
        "flag": "HONG KONG"
    },
    "min_distance_m": 278.5,
    "avg_distance_m": 283.69999999999998863131622783839702606201171875,
    "distance_consistency_m": 2.20000000000000017763568394002504646778106689453125,
    "duration_minutes": 126,
    "overlap_duration_s": 7560,
    "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": "2026-10-24T04:42:12+00:00",
        "end": "2026-10-24T06:48:12+00:00"
    },
    "points_count": {
        "vessel_a": 11,
        "vessel_b": 11
    },
    "zone_id": "discovered_003",
    "zone_name": "Southern \u00d6resund Surveillance Zone",
    "score": {
        "value": 85,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 278m, avg 284m"
            },
            "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: Southern \u00d6resund Surveillance Zone"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (CL MARGARET MITCHELL and LIAN XI HU) maintained close proximity (min 278m, avg 284m) 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 Southern \u00d6resund Surveillance Zone, a known STS activity area."
    }
}
Methodology: 2026.01.18
Zone Dwell Southern Öresund Surveillance Zone
Oct 24, 2026 04:24 UTC 80.0% ▼
  • Zone: Southern Öresund Surveillance Zone
  • Duration: 6h 30m
  • Data Points: 21 AIS positions
  • Period: 2026-10-24T04:54:12+00:00 to 2026-10-24T11:24:12+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_003",
    "zone_name": "Southern \u00d6resund Surveillance Zone",
    "dwell_minutes": 390,
    "points_in_zone": 21,
    "first_point": {
        "ts": "2026-10-24T04:54:12+00:00",
        "lat": 37.159611699999999245846993289887905120849609375,
        "lon": -6.89656670000000016074181985459290444850921630859375
    },
    "last_point": {
        "ts": "2026-10-24T11:24:12+00:00",
        "lat": 37.15958830000000290283423964865505695343017578125,
        "lon": -6.89657330000000001746229827404022216796875
    }
}
Methodology: 2026.01.18
Loiter Southern Öresund Surveillance Zone
Oct 24, 2026 04:24 UTC 75.0% ▼
  • Duration: 6h 30m
  • Radius: 5 meters
  • Data Points: 21 AIS positions
  • Centroid: 37.1596, -6.8966
  • Zone: Southern Öresund Surveillance Zone
Show Raw Evidence JSON
{
    "radius_m": 5.4000000000000003552713678800500929355621337890625,
    "duration_minutes": 390,
    "points": 21,
    "centroid": {
        "lat": 37.15960754285714529032702557742595672607421875,
        "lon": -6.89659229999999912052999206935055553913116455078125
    },
    "bbox": {
        "min_lat": 37.159566699999999173087417148053646087646484375,
        "min_lon": -6.896628299999999711644704802893102169036865234375,
        "max_lat": 37.1596382999999974572347127832472324371337890625,
        "max_lon": -6.8965566999999996511405697674490511417388916015625
    },
    "zone_id": "discovered_003"
}
Methodology: 2026.01.18
Zone Dwell Southern Öresund Surveillance Zone
Oct 24, 2026 03:48 UTC 80.0% ▼
  • Zone: Southern Öresund Surveillance Zone
  • Duration: 6h 30m
  • Data Points: 22 AIS positions
  • Period: 2026-10-24T03:48:12+00:00 to 2026-10-24T10:18:12+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_003",
    "zone_name": "Southern \u00d6resund Surveillance Zone",
    "dwell_minutes": 390,
    "points_in_zone": 22,
    "first_point": {
        "ts": "2026-10-24T03:48:12+00:00",
        "lat": 37.15961329999999662732079741545021533966064453125,
        "lon": -6.89661170000000023350139599642716348171234130859375
    },
    "last_point": {
        "ts": "2026-10-24T10:18:12+00:00",
        "lat": 37.1596066999999976587787386961281299591064453125,
        "lon": -6.89660000000000028563817977556027472019195556640625
    }
}
Methodology: 2026.01.18
Loiter Southern Öresund Surveillance Zone
Oct 24, 2026 03:48 UTC 75.0% ▼
  • Duration: 6h 30m
  • Radius: 6 meters
  • Data Points: 22 AIS positions
  • Centroid: 37.1596, -6.8966
  • Zone: Southern Öresund Surveillance Zone
Show Raw Evidence JSON
{
    "radius_m": 5.5999999999999996447286321199499070644378662109375,
    "duration_minutes": 390,
    "points": 22,
    "centroid": {
        "lat": 37.15961038181819020564944366924464702606201171875,
        "lon": -6.89659197272727109151446711621247231960296630859375
    },
    "bbox": {
        "min_lat": 37.159566699999999173087417148053646087646484375,
        "min_lon": -6.896628299999999711644704802893102169036865234375,
        "max_lat": 37.1596382999999974572347127832472324371337890625,
        "max_lon": -6.8965566999999996511405697674490511417388916015625
    },
    "zone_id": "discovered_003"
}
Methodology: 2026.01.18
Sts Southern Öresund Surveillance Zone
Oct 24, 2026 03:45 UTC 85/100 ▼
Vessel A: IMO 9943372 (CL MARGARET MITCHELL) LIBERIA
Vessel B: IMO 9747106 (LIAN XI HU) HONG KONG
  • Minimum Distance: 279 meters
  • Average Distance: 283 meters
  • Duration: 3 hours
  • Period: 2026-10-24T03:48:12+00:00 to 2026-10-24T06:48:12+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Southern Öresund Surveillance Zone

Confidence Analysis

Score: 85/100

High-confidence STS candidate. Two tankers (CL MARGARET MITCHELL and LIAN XI HU) maintained close proximity (min 278m, avg 283m) for 180 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 Southern Öresund Surveillance Zone, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness15/25Min distance 278m, avg 283m
Duration25/25Duration 180 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±2m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Southern Öresund Surveillance Zone
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 636022165,
        "imo": 9943372,
        "name": "CL MARGARET MITCHELL",
        "flag": "LIBERIA"
    },
    "vessel_b": {
        "mmsi": 477021600,
        "imo": 9747106,
        "name": "LIAN XI HU",
        "flag": "HONG KONG"
    },
    "min_distance_m": 278.5,
    "avg_distance_m": 283.1000000000000227373675443232059478759765625,
    "distance_consistency_m": 2.29999999999999982236431605997495353221893310546875,
    "duration_minutes": 180,
    "overlap_duration_s": 10800,
    "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": "2026-10-24T03:48:12+00:00",
        "end": "2026-10-24T06:48:12+00:00"
    },
    "points_count": {
        "vessel_a": 14,
        "vessel_b": 14
    },
    "zone_id": "discovered_003",
    "zone_name": "Southern \u00d6resund Surveillance Zone",
    "score": {
        "value": 85,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 278m, avg 283m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 180 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: Southern \u00d6resund Surveillance Zone"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (CL MARGARET MITCHELL and LIAN XI HU) maintained close proximity (min 278m, avg 283m) for 180 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 Southern \u00d6resund Surveillance Zone, a known STS activity area."
    }
}
Methodology: 2026.01.18
Sts Southern Öresund Surveillance Zone
Oct 24, 2026 02:30 UTC 85/100 ▼
Vessel A: IMO 9943372 (CL MARGARET MITCHELL) LIBERIA
Vessel B: IMO 9747106 (LIAN XI HU) HONG KONG
  • Minimum Distance: 274 meters
  • Average Distance: 283 meters
  • Duration: 4h 18m
  • Period: 2026-10-24T02:30:12+00:00 to 2026-10-24T06:48:12+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Southern Öresund Surveillance Zone

Confidence Analysis

Score: 85/100

High-confidence STS candidate. Two tankers (CL MARGARET MITCHELL and LIAN XI HU) maintained close proximity (min 274m, avg 283m) for 258 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 Southern Öresund Surveillance Zone, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness15/25Min distance 274m, avg 283m
Duration25/25Duration 258 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±3m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Southern Öresund Surveillance Zone
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 636022165,
        "imo": 9943372,
        "name": "CL MARGARET MITCHELL",
        "flag": "LIBERIA"
    },
    "vessel_b": {
        "mmsi": 477021600,
        "imo": 9747106,
        "name": "LIAN XI HU",
        "flag": "HONG KONG"
    },
    "min_distance_m": 274.3999999999999772626324556767940521240234375,
    "avg_distance_m": 282.6000000000000227373675443232059478759765625,
    "distance_consistency_m": 2.899999999999999911182158029987476766109466552734375,
    "duration_minutes": 258,
    "overlap_duration_s": 15480,
    "speed_a_avg": 0,
    "speed_a_std": 0,
    "speed_b_avg": 0.0200000000000000004163336342344337026588618755340576171875,
    "speed_b_std": 0.040000000000000000832667268468867405317723751068115234375,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0,
            "max_sog": 0
        },
        "vessel_b": {
            "avg_sog": 0.0200000000000000004163336342344337026588618755340576171875,
            "max_sog": 0.1000000000000000055511151231257827021181583404541015625
        }
    },
    "time_window": {
        "start": "2026-10-24T02:30:12+00:00",
        "end": "2026-10-24T06:48:12+00:00"
    },
    "points_count": {
        "vessel_a": 18,
        "vessel_b": 18
    },
    "zone_id": "discovered_003",
    "zone_name": "Southern \u00d6resund Surveillance Zone",
    "score": {
        "value": 85,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 274m, avg 283m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 258 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b13m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Southern \u00d6resund Surveillance Zone"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (CL MARGARET MITCHELL and LIAN XI HU) maintained close proximity (min 274m, avg 283m) for 258 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 Southern \u00d6resund Surveillance Zone, a known STS activity area."
    }
}
Methodology: 2026.01.18
Zone Dwell Southern Öresund Surveillance Zone
Oct 24, 2026 02:12 UTC 80.0% ▼
  • Zone: Southern Öresund Surveillance Zone
  • Duration: 6h 36m
  • Data Points: 21 AIS positions
  • Period: 2026-10-24T02:42:12+00:00 to 2026-10-24T09:18:12+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_003",
    "zone_name": "Southern \u00d6resund Surveillance Zone",
    "dwell_minutes": 396,
    "points_in_zone": 21,
    "first_point": {
        "ts": "2026-10-24T02:42:12+00:00",
        "lat": 37.15961329999999662732079741545021533966064453125,
        "lon": -6.89660329999999976990920913522131741046905517578125
    },
    "last_point": {
        "ts": "2026-10-24T09:18:12+00:00",
        "lat": 37.15961999999999676447259844280779361724853515625,
        "lon": -6.8965917000000001024773155222646892070770263671875
    }
}
Methodology: 2026.01.18
Loiter Southern Öresund Surveillance Zone
Oct 24, 2026 02:12 UTC 75.0% ▼
  • Duration: 6h 36m
  • Radius: 6 meters
  • Data Points: 21 AIS positions
  • Centroid: 37.1596, -6.8966
  • Zone: Southern Öresund Surveillance Zone
Show Raw Evidence JSON
{
    "radius_m": 5.9000000000000003552713678800500929355621337890625,
    "duration_minutes": 396,
    "points": 21,
    "centroid": {
        "lat": 37.15961261904762835683868615888059139251708984375,
        "lon": -6.896592461904759829849353991448879241943359375
    },
    "bbox": {
        "min_lat": 37.159566699999999173087417148053646087646484375,
        "min_lon": -6.896628299999999711644704802893102169036865234375,
        "max_lat": 37.1596382999999974572347127832472324371337890625,
        "max_lon": -6.8965566999999996511405697674490511417388916015625
    },
    "zone_id": "discovered_003"
}
Methodology: 2026.01.18
Zone Dwell Southern Öresund Surveillance Zone
Oct 24, 2026 01:12 UTC 80.0% ▼
  • Zone: Southern Öresund Surveillance Zone
  • Duration: 6h 12m
  • Data Points: 25 AIS positions
  • Period: 2026-10-24T01:12:12+00:00 to 2026-10-24T07:24:12+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_003",
    "zone_name": "Southern \u00d6resund Surveillance Zone",
    "dwell_minutes": 372,
    "points_in_zone": 25,
    "first_point": {
        "ts": "2026-10-24T01:12:12+00:00",
        "lat": 37.159615000000002282831701450049877166748046875,
        "lon": -6.89660999999999990706101016257889568805694580078125
    },
    "last_point": {
        "ts": "2026-10-24T07:24:12+00:00",
        "lat": 37.1596100000000006957634468562901020050048828125,
        "lon": -6.89660999999999990706101016257889568805694580078125
    }
}
Methodology: 2026.01.18
Loiter Southern Öresund Surveillance Zone
Oct 24, 2026 01:12 UTC 75.0% ▼
  • Duration: 6h 12m
  • Radius: 6 meters
  • Data Points: 25 AIS positions
  • Centroid: 37.1596, -6.8966
  • Zone: Southern Öresund Surveillance Zone
Show Raw Evidence JSON
{
    "radius_m": 6.20000000000000017763568394002504646778106689453125,
    "duration_minutes": 372,
    "points": 25,
    "centroid": {
        "lat": 37.15961466400000290377647615969181060791015625,
        "lon": -6.8965958000000000538420863449573516845703125
    },
    "bbox": {
        "min_lat": 37.159566699999999173087417148053646087646484375,
        "min_lon": -6.896628299999999711644704802893102169036865234375,
        "max_lat": 37.1596449999999975943865138106048107147216796875,
        "max_lon": -6.89656000000000002359001882723532617092132568359375
    },
    "zone_id": "discovered_003"
}
Methodology: 2026.01.18
Sts Southern Öresund Surveillance Zone
Oct 24, 2026 00:54 UTC 70/100 ▼
Vessel A: IMO 9747106 (LIAN XI HU) HONG KONG
Vessel B: IMO 9943372 (CL MARGARET MITCHELL) LIBERIA
  • Minimum Distance: 281 meters
  • Average Distance: 283 meters
  • Duration: 48 minutes
  • Period: 2026-10-24T00:51:49+00:00 to 2026-10-24T01:39:49+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Southern Öresund Surveillance Zone

Confidence Analysis

Score: 70/100

Moderate-confidence STS candidate. Two tankers (LIAN XI HU and CL MARGARET MITCHELL) maintained close proximity (min 280m, avg 283m) for 48 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 Southern Öresund Surveillance Zone, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness15/25Min distance 280m, avg 283m
Duration10/25Duration 48 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±2m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Southern Öresund Surveillance Zone
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 477021600,
        "imo": 9747106,
        "name": "LIAN XI HU",
        "flag": "HONG KONG"
    },
    "vessel_b": {
        "mmsi": 636022165,
        "imo": 9943372,
        "name": "CL MARGARET MITCHELL",
        "flag": "LIBERIA"
    },
    "min_distance_m": 280.5,
    "avg_distance_m": 283.1000000000000227373675443232059478759765625,
    "distance_consistency_m": 1.5,
    "duration_minutes": 48,
    "overlap_duration_s": 2880,
    "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": "2026-10-24T00:51:49+00:00",
        "end": "2026-10-24T01:39:49+00:00"
    },
    "points_count": {
        "vessel_a": 6,
        "vessel_b": 6
    },
    "zone_id": "discovered_003",
    "zone_name": "Southern \u00d6resund Surveillance Zone",
    "score": {
        "value": 70,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 280m, avg 283m"
            },
            "duration": {
                "score": 10,
                "max": 25,
                "detail": "Duration 48 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: Southern \u00d6resund Surveillance Zone"
            }
        },
        "summary": "Moderate-confidence STS candidate. Two tankers (LIAN XI HU and CL MARGARET MITCHELL) maintained close proximity (min 280m, avg 283m) for 48 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 Southern \u00d6resund Surveillance Zone, a known STS activity area."
    }
}
Methodology: 2026.01.18
Zone Dwell Southern Öresund Surveillance Zone
Oct 24, 2026 00:00 UTC 80.0% ▼
  • Zone: Southern Öresund Surveillance Zone
  • Duration: 6h 30m
  • Data Points: 26 AIS positions
  • Period: 2026-10-24T00:54:12+00:00 to 2026-10-24T07:24:12+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_003",
    "zone_name": "Southern \u00d6resund Surveillance Zone",
    "dwell_minutes": 390,
    "points_in_zone": 26,
    "first_point": {
        "ts": "2026-10-24T00:54:12+00:00",
        "lat": 37.15961329999999662732079741545021533966064453125,
        "lon": -6.8965917000000001024773155222646892070770263671875
    },
    "last_point": {
        "ts": "2026-10-24T07:24:12+00:00",
        "lat": 37.1596100000000006957634468562901020050048828125,
        "lon": -6.89660999999999990706101016257889568805694580078125
    }
}
Methodology: 2026.01.18
Loiter Southern Öresund Surveillance Zone
Oct 24, 2026 00:00 UTC 75.0% ▼
  • Duration: 6h 30m
  • Radius: 6 meters
  • Data Points: 26 AIS positions
  • Centroid: 37.1596, -6.8966
  • Zone: Southern Öresund Surveillance Zone
Show Raw Evidence JSON
{
    "radius_m": 6.20000000000000017763568394002504646778106689453125,
    "duration_minutes": 390,
    "points": 26,
    "centroid": {
        "lat": 37.1596146115384584618368535302579402923583984375,
        "lon": -6.8965956423076928416548980749212205410003662109375
    },
    "bbox": {
        "min_lat": 37.159566699999999173087417148053646087646484375,
        "min_lon": -6.896628299999999711644704802893102169036865234375,
        "max_lat": 37.1596449999999975943865138106048107147216796875,
        "max_lon": -6.89656000000000002359001882723532617092132568359375
    },
    "zone_id": "discovered_003"
}
Methodology: 2026.01.18
Sts🛰️✗ Southern Öresund Surveillance Zone
Oct 23, 2026 23:06 UTC 70/100 ▼
Vessel A: IMO 9943372 (CL MARGARET MITCHELL) LIBERIA
Vessel B: IMO 9747106 (LIAN XI HU) HONG KONG
  • Minimum Distance: 283 meters
  • Average Distance: 284 meters
  • Duration: 48 minutes
  • Period: 2026-10-23T23:06:12+00:00 to 2026-10-23T23:54:12+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Southern Öresund Surveillance Zone

Confidence Analysis

Score: 70/100

Moderate-confidence STS candidate. Two tankers (CL MARGARET MITCHELL and LIAN XI HU) maintained close proximity (min 283m, avg 284m) for 48 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 Southern Öresund Surveillance Zone, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness15/25Min distance 283m, avg 284m
Duration10/25Duration 48 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±0m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Southern Öresund Surveillance Zone

🛰️ Satellite Corroboration

✗ SAR Not Available

No satellite imagery for this time/location

No Sentinel-1 scenes covering AOI and time window

Searched: 2026-10-24T01:15:06.169644+00:00

Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 636022165,
        "imo": 9943372,
        "name": "CL MARGARET MITCHELL",
        "flag": "LIBERIA"
    },
    "vessel_b": {
        "mmsi": 477021600,
        "imo": 9747106,
        "name": "LIAN XI HU",
        "flag": "HONG KONG"
    },
    "min_distance_m": 283.1000000000000227373675443232059478759765625,
    "avg_distance_m": 283.5,
    "distance_consistency_m": 0.299999999999999988897769753748434595763683319091796875,
    "duration_minutes": 48,
    "overlap_duration_s": 2880,
    "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": "2026-10-23T23:06:12+00:00",
        "end": "2026-10-23T23:54:12+00:00"
    },
    "points_count": {
        "vessel_a": 4,
        "vessel_b": 4
    },
    "zone_id": "discovered_003",
    "zone_name": "Southern \u00d6resund Surveillance Zone",
    "score": {
        "value": 70,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 283m, avg 284m"
            },
            "duration": {
                "score": 10,
                "max": 25,
                "detail": "Duration 48 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b10m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Southern \u00d6resund Surveillance Zone"
            }
        },
        "summary": "Moderate-confidence STS candidate. Two tankers (CL MARGARET MITCHELL and LIAN XI HU) maintained close proximity (min 283m, avg 284m) for 48 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 Southern \u00d6resund Surveillance Zone, a known STS activity area."
    },
    "sar": {
        "status": "not_found",
        "centroid": {
            "lat": 37.16036369999999777746779727749526500701904296875,
            "lon": -6.89787730000000021135520000825636088848114013671875
        },
        "time_window": {
            "start_ts": "2026-10-23T23:06:12+00:00",
            "end_ts": "2026-10-23T23:54:12+00:00"
        },
        "searched_at": "2026-10-24T01:15:06.169644+00:00",
        "notes": "No Sentinel-1 scenes covering AOI and time window"
    }
}
Methodology: 2026.01.18
Zone Dwell Southern Öresund Surveillance Zone
Oct 23, 2026 23:06 UTC 80.0% ▼
  • Zone: Southern Öresund Surveillance Zone
  • Duration: 6h 30m
  • Data Points: 26 AIS positions
  • Period: 2026-10-23T23:24:12+00:00 to 2026-10-24T05:54:12+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_003",
    "zone_name": "Southern \u00d6resund Surveillance Zone",
    "dwell_minutes": 390,
    "points_in_zone": 26,
    "first_point": {
        "ts": "2026-10-23T23:24:12+00:00",
        "lat": 37.159615000000002282831701450049877166748046875,
        "lon": -6.89658830000000033777496355469338595867156982421875
    },
    "last_point": {
        "ts": "2026-10-24T05:54:12+00:00",
        "lat": 37.159566699999999173087417148053646087646484375,
        "lon": -6.89656000000000002359001882723532617092132568359375
    }
}
Methodology: 2026.01.18
Loiter Southern Öresund Surveillance Zone
Oct 23, 2026 23:06 UTC 75.0% ▼
  • Duration: 6h 30m
  • Radius: 6 meters
  • Data Points: 26 AIS positions
  • Centroid: 37.1596, -6.8966
  • Zone: Southern Öresund Surveillance Zone
Show Raw Evidence JSON
{
    "radius_m": 5.79999999999999982236431605997495353221893310546875,
    "duration_minutes": 390,
    "points": 26,
    "centroid": {
        "lat": 37.159612046153853270880063064396381378173828125,
        "lon": -6.89659243846153824364364481880329549312591552734375
    },
    "bbox": {
        "min_lat": 37.159566699999999173087417148053646087646484375,
        "min_lon": -6.896628299999999711644704802893102169036865234375,
        "max_lat": 37.1596449999999975943865138106048107147216796875,
        "max_lon": -6.89656000000000002359001882723532617092132568359375
    },
    "zone_id": "discovered_003"
}
Methodology: 2026.01.18
Sts🛰️✗ Southern Öresund Surveillance Zone
Oct 23, 2026 22:15 UTC 80/100 ▼
Vessel A: IMO 9747106 (LIAN XI HU) HONG KONG
Vessel B: IMO 9943372 (CL MARGARET MITCHELL) LIBERIA
  • Minimum Distance: 279 meters
  • Average Distance: 282 meters
  • Duration: 1h 30m
  • Period: 2026-10-23T22:15:49+00:00 to 2026-10-23T23:45:49+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Southern Öresund Surveillance Zone

Confidence Analysis

Score: 80/100

High-confidence STS candidate. Two tankers (LIAN XI HU and CL MARGARET MITCHELL) maintained close proximity (min 279m, avg 282m) for 90 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 Southern Öresund Surveillance Zone, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness15/25Min distance 279m, avg 282m
Duration20/25Duration 90 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±2m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Southern Öresund Surveillance Zone

🛰️ Satellite Corroboration

✗ SAR Not Available

No satellite imagery for this time/location

No Sentinel-1 scenes covering AOI and time window

Searched: 2026-10-24T04:45:02.033634+00:00

Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 477021600,
        "imo": 9747106,
        "name": "LIAN XI HU",
        "flag": "HONG KONG"
    },
    "vessel_b": {
        "mmsi": 636022165,
        "imo": 9943372,
        "name": "CL MARGARET MITCHELL",
        "flag": "LIBERIA"
    },
    "min_distance_m": 279.30000000000001136868377216160297393798828125,
    "avg_distance_m": 282.3999999999999772626324556767940521240234375,
    "distance_consistency_m": 2,
    "duration_minutes": 90,
    "overlap_duration_s": 5400,
    "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": "2026-10-23T22:15:49+00:00",
        "end": "2026-10-23T23:45:49+00:00"
    },
    "points_count": {
        "vessel_a": 7,
        "vessel_b": 7
    },
    "zone_id": "discovered_003",
    "zone_name": "Southern \u00d6resund Surveillance Zone",
    "score": {
        "value": 80,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 279m, avg 282m"
            },
            "duration": {
                "score": 20,
                "max": 25,
                "detail": "Duration 90 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: Southern \u00d6resund Surveillance Zone"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (LIAN XI HU and CL MARGARET MITCHELL) maintained close proximity (min 279m, avg 282m) for 90 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 Southern \u00d6resund Surveillance Zone, a known STS activity area."
    },
    "sar": {
        "status": "not_found",
        "centroid": {
            "lat": 37.16036559999999866477082832716405391693115234375,
            "lon": -6.89787619999999979114591042161919176578521728515625
        },
        "time_window": {
            "start_ts": "2026-10-23T22:15:49+00:00",
            "end_ts": "2026-10-23T23:45:49+00:00"
        },
        "searched_at": "2026-10-24T04:45:02.033634+00:00",
        "notes": "No Sentinel-1 scenes covering AOI and time window"
    }
}
Methodology: 2026.01.18
Zone Dwell Southern Öresund Surveillance Zone
Oct 23, 2026 22:06 UTC 80.0% ▼
  • Zone: Southern Öresund Surveillance Zone
  • Duration: 6h 24m
  • Data Points: 24 AIS positions
  • Period: 2026-10-23T22:54:12+00:00 to 2026-10-24T05:18:12+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_003",
    "zone_name": "Southern \u00d6resund Surveillance Zone",
    "dwell_minutes": 384,
    "points_in_zone": 24,
    "first_point": {
        "ts": "2026-10-23T22:54:12+00:00",
        "lat": 37.15963169999999848869265406392514705657958984375,
        "lon": -6.89660329999999976990920913522131741046905517578125
    },
    "last_point": {
        "ts": "2026-10-24T05:18:12+00:00",
        "lat": 37.1596066999999976587787386961281299591064453125,
        "lon": -6.89656999999999964501284921425394713878631591796875
    }
}
Methodology: 2026.01.18
Loiter Southern Öresund Surveillance Zone
Oct 23, 2026 22:06 UTC 75.0% ▼
  • Duration: 6h 24m
  • Radius: 4 meters
  • Data Points: 24 AIS positions
  • Centroid: 37.1596, -6.8966
  • Zone: Southern Öresund Surveillance Zone
Show Raw Evidence JSON
{
    "radius_m": 4.20000000000000017763568394002504646778106689453125,
    "duration_minutes": 384,
    "points": 24,
    "centroid": {
        "lat": 37.15961492500000673544491291977465152740478515625,
        "lon": -6.89659381666666604360216297209262847900390625
    },
    "bbox": {
        "min_lat": 37.15959170000000000300133251585066318511962890625,
        "min_lon": -6.896628299999999711644704802893102169036865234375,
        "max_lat": 37.1596449999999975943865138106048107147216796875,
        "max_lon": -6.89656670000000016074181985459290444850921630859375
    },
    "zone_id": "discovered_003"
}
Methodology: 2026.01.18
Sts Southern Öresund Surveillance Zone
Oct 23, 2026 21:00 UTC 85/100 ▼
Vessel A: IMO 9747106 (LIAN XI HU) HONG KONG
Vessel B: IMO 9943372 (CL MARGARET MITCHELL) LIBERIA
  • Minimum Distance: 279 meters
  • Average Distance: 283 meters
  • Duration: 2h 36m
  • Period: 2026-10-23T21:09:49+00:00 to 2026-10-23T23:45:49+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Southern Öresund Surveillance Zone

Confidence Analysis

Score: 85/100

High-confidence STS candidate. Two tankers (LIAN XI HU and CL MARGARET MITCHELL) maintained close proximity (min 279m, avg 283m) for 156 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 Southern Öresund Surveillance Zone, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness15/25Min distance 279m, avg 283m
Duration25/25Duration 156 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±2m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Southern Öresund Surveillance Zone
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 477021600,
        "imo": 9747106,
        "name": "LIAN XI HU",
        "flag": "HONG KONG"
    },
    "vessel_b": {
        "mmsi": 636022165,
        "imo": 9943372,
        "name": "CL MARGARET MITCHELL",
        "flag": "LIBERIA"
    },
    "min_distance_m": 279.30000000000001136868377216160297393798828125,
    "avg_distance_m": 282.69999999999998863131622783839702606201171875,
    "distance_consistency_m": 1.899999999999999911182158029987476766109466552734375,
    "duration_minutes": 156,
    "overlap_duration_s": 9360,
    "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": "2026-10-23T21:09:49+00:00",
        "end": "2026-10-23T23:45:49+00:00"
    },
    "points_count": {
        "vessel_a": 10,
        "vessel_b": 10
    },
    "zone_id": "discovered_003",
    "zone_name": "Southern \u00d6resund Surveillance Zone",
    "score": {
        "value": 85,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 279m, avg 283m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 156 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: Southern \u00d6resund Surveillance Zone"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (LIAN XI HU and CL MARGARET MITCHELL) maintained close proximity (min 279m, avg 283m) for 156 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 Southern \u00d6resund Surveillance Zone, a known STS activity area."
    }
}
Methodology: 2026.01.18

Recent Position Data

Time (UTC) Lat Lon Speed Course Zone
Oct 28 10:13 49.2351 -4.4000 11.1 kn 57.9° Norwegian Sea Surveillance Zone
Oct 28 10:06 49.2228 -4.4316 11.4 kn 58.8° Norwegian Sea Surveillance Zone
Oct 28 10:02 49.2171 -4.4461 11.5 kn 59.4° Norwegian Sea Surveillance Zone
Oct 28 09:47 49.1900 -4.5076 11.6 kn 55.6° Norwegian Sea Surveillance Zone
Oct 28 09:46 49.1875 -4.5131 11.7 kn 55.5° Norwegian Sea Surveillance Zone
Oct 28 09:39 49.1759 -4.5387 11.6 kn 55.1° Norwegian Sea Surveillance Zone
Oct 28 09:25 49.1503 -4.5956 11.9 kn 56.6° Norwegian Sea Surveillance Zone
Oct 28 09:17 49.1347 -4.6310 11.7 kn 56.6° Norwegian Sea Surveillance Zone
Oct 28 09:09 49.1214 -4.6615 11.8 kn 57.3° Norwegian Sea Surveillance Zone
Oct 28 08:46 49.0802 -4.7610 11.7 kn 59.6° Norwegian Sea Surveillance Zone
Oct 28 08:42 49.0739 -4.7778 12.1 kn 59.4° Norwegian Sea Surveillance Zone
Oct 28 08:40 49.0705 -4.7867 12.0 kn 59.1° Norwegian Sea Surveillance Zone
Oct 28 08:39 49.0682 -4.7927 12.2 kn 59.0° Norwegian Sea Surveillance Zone
Oct 28 08:35 49.0609 -4.8121 12.0 kn 59.4° Norwegian Sea Surveillance Zone
Oct 28 08:30 49.0525 -4.8344 12.2 kn 60.8° Norwegian Sea Surveillance Zone
Oct 28 08:29 49.0508 -4.8388 12.1 kn 61.4° Norwegian Sea Surveillance Zone
Oct 28 08:24 49.0424 -4.8613 12.3 kn 61.4° Norwegian Sea Surveillance Zone
Oct 28 08:13 49.0246 -4.9091 12.2 kn 60.9° Norwegian Sea Surveillance Zone
Oct 28 08:12 49.0230 -4.9135 12.1 kn 61.7° Norwegian Sea Surveillance Zone
Oct 28 08:03 49.0085 -4.9533 11.8 kn 60.6° Norwegian Sea Surveillance Zone

Showing 20 of 100 recent positions.

Data Source

Vessel observed through FleetLeaks' AIS monitoring system in zones of interest. Identity and position data derived from AIS broadcasts and public maritime databases.

Disclaimer: AIS data can be spoofed or falsified. Vessel identities should be independently verified before making compliance decisions.