VOLGONEFT 128

IMO 8230728

Vessel information

Vessel Name VOLGONEFT 128
IMO Number 8230728
MMSI 273437610
Vessel Type Tanker
Flag 🇷🇺 RUSSIA
Call Sign UFHE
Length 133 m
Beam 17 m

Detected Events (100)

Ais Gap🛰️✗ Ust-Luga/St. Petersburg Approach
Sep 2, 2026 02:52 UTC 70.0% ▼
  • Gap Duration: 5h 52m
  • Last Seen: 2026-09-02T02:52:45+00:00 at 59.8819, 30.2268 (Zone: Ust-Luga/St. Petersburg Approach)
  • Next Seen: 2026-09-02T08:44:44+00:00 at 59.8818, 30.2268

🛰️ Gap Corroboration

✗ No Imagery

These are snapshots that may corroborate presence during the gap. They do not reconstruct a continuous route.

SAR Imagery (Sentinel-1)

Status: ✗ No SAR coverage

No Sentinel-1 scenes covering corridor and time window

VIIRS Thermal Anomaly

Status: ✗ No detections

No VIIRS thermal/light detections in corridor

Searched: 2026-09-02T09:00:01.926232+00:00

Show Raw Evidence JSON
{
    "gap_minutes": 352,
    "last_seen": {
        "ts": "2026-09-02T02:52:45+00:00",
        "lat": 59.88188670000000257687133853323757648468017578125,
        "lon": 30.22682830000000109293978312052786350250244140625,
        "sog": 102.2999999999999971578290569595992565155029296875,
        "zone_id": "russia_ust_luga_approach"
    },
    "next_seen": {
        "ts": "2026-09-02T08:44:44+00:00",
        "lat": 59.88181999999999760575519758276641368865966796875,
        "lon": 30.22682999999999964302332955412566661834716796875,
        "zone_ids": [
            "russia_ust_luga_approach"
        ]
    },
    "gap_enrichment": {
        "status": "not_found",
        "corridor": {
            "start": {
                "lat": 59.88188670000000257687133853323757648468017578125,
                "lon": 30.22682830000000109293978312052786350250244140625,
                "ts": "2026-09-02T02:52:45+00:00"
            },
            "end": {
                "lat": 59.88181999999999760575519758276641368865966796875,
                "lon": 30.22682999999999964302332955412566661834716796875,
                "ts": "2026-09-02T08:44:44+00:00"
            },
            "bbox": {
                "min_lat": 59.701639999999997598933987319469451904296875,
                "min_lon": 29.8677500000000009094947017729282379150390625,
                "max_lat": 60.0620669999999989840944181196391582489013671875,
                "max_lon": 30.5859090000000009013092494569718837738037109375
            },
            "buffer_km": 20
        },
        "sar": {
            "status": "not_found",
            "notes": "No Sentinel-1 scenes covering corridor and time window"
        },
        "viirs": {
            "status": "not_found",
            "notes": "No VIIRS thermal\/light detections in corridor"
        },
        "searched_at": "2026-09-02T09:00:01.926232+00:00"
    }
}
Methodology: 2026.01.18
Zone Dwell Ust-Luga/St. Petersburg Approach
Sep 2, 2026 02:52 UTC 80.0% ▼
  • Zone: Ust-Luga/St. Petersburg Approach
  • Duration: 5h 52m
  • Data Points: 2 AIS positions
  • Period: 2026-09-02T02:52:45+00:00 to 2026-09-02T08:44:44+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 352,
    "points_in_zone": 2,
    "first_point": {
        "ts": "2026-09-02T02:52:45+00:00",
        "lat": 59.88188670000000257687133853323757648468017578125,
        "lon": 30.22682830000000109293978312052786350250244140625
    },
    "last_point": {
        "ts": "2026-09-02T08:44:44+00:00",
        "lat": 59.88181999999999760575519758276641368865966796875,
        "lon": 30.22682999999999964302332955412566661834716796875
    }
}
Methodology: 2026.01.18
Ais Gap🛰️✗ Ust-Luga/St. Petersburg Approach
Sep 1, 2026 22:49 UTC 70.0% ▼
  • Gap Duration: 4h 3m
  • Last Seen: 2026-09-01T22:49:24+00:00 at 59.8819, 30.2269 (Zone: Ust-Luga/St. Petersburg Approach)
  • Next Seen: 2026-09-02T02:52:45+00:00 at 59.8819, 30.2268

🛰️ Gap Corroboration

✗ No Imagery

These are snapshots that may corroborate presence during the gap. They do not reconstruct a continuous route.

SAR Imagery (Sentinel-1)

Status: ✗ No SAR coverage

No Sentinel-1 scenes covering corridor and time window

VIIRS Thermal Anomaly

Status: ✗ No detections

No VIIRS thermal/light detections in corridor

Searched: 2026-09-02T03:15:09.427696+00:00

Show Raw Evidence JSON
{
    "gap_minutes": 243.30000000000001136868377216160297393798828125,
    "last_seen": {
        "ts": "2026-09-01T22:49:24+00:00",
        "lat": 59.88187330000000230256773647852241992950439453125,
        "lon": 30.226936699999999547117113252170383930206298828125,
        "sog": 102.2999999999999971578290569595992565155029296875,
        "zone_id": "russia_ust_luga_approach"
    },
    "next_seen": {
        "ts": "2026-09-02T02:52:45+00:00",
        "lat": 59.88188670000000257687133853323757648468017578125,
        "lon": 30.22682830000000109293978312052786350250244140625,
        "zone_ids": [
            "russia_ust_luga_approach"
        ]
    },
    "gap_enrichment": {
        "status": "not_found",
        "corridor": {
            "start": {
                "lat": 59.88187330000000230256773647852241992950439453125,
                "lon": 30.226936699999999547117113252170383930206298828125,
                "ts": "2026-09-01T22:49:24+00:00"
            },
            "end": {
                "lat": 59.88188670000000257687133853323757648468017578125,
                "lon": 30.22682830000000109293978312052786350250244140625,
                "ts": "2026-09-02T02:52:45+00:00"
            },
            "bbox": {
                "min_lat": 59.70169299999999878991729929111897945404052734375,
                "min_lon": 29.867748999999999881538315094076097011566162109375,
                "max_lat": 60.0620669999999989840944181196391582489013671875,
                "max_lon": 30.586016000000000758518581278622150421142578125
            },
            "buffer_km": 20
        },
        "sar": {
            "status": "not_found",
            "notes": "No Sentinel-1 scenes covering corridor and time window"
        },
        "viirs": {
            "status": "not_found",
            "notes": "No VIIRS thermal\/light detections in corridor"
        },
        "searched_at": "2026-09-02T03:15:09.427696+00:00"
    }
}
Methodology: 2026.01.18
Zone Dwell Ust-Luga/St. Petersburg Approach
Sep 1, 2026 22:49 UTC 80.0% ▼
  • Zone: Ust-Luga/St. Petersburg Approach
  • Duration: 4h 3m
  • Data Points: 2 AIS positions
  • Period: 2026-09-01T22:49:24+00:00 to 2026-09-02T02:52:45+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 243.30000000000001136868377216160297393798828125,
    "points_in_zone": 2,
    "first_point": {
        "ts": "2026-09-01T22:49:24+00:00",
        "lat": 59.88187330000000230256773647852241992950439453125,
        "lon": 30.226936699999999547117113252170383930206298828125
    },
    "last_point": {
        "ts": "2026-09-02T02:52:45+00:00",
        "lat": 59.88188670000000257687133853323757648468017578125,
        "lon": 30.22682830000000109293978312052786350250244140625
    }
}
Methodology: 2026.01.18
Zone Dwell Ust-Luga/St. Petersburg Approach
Sep 1, 2026 19:01 UTC 80.0% ▼
  • Zone: Ust-Luga/St. Petersburg Approach
  • Duration: 3h 47m
  • Data Points: 2 AIS positions
  • Period: 2026-09-01T19:01:40+00:00 to 2026-09-01T22:49:24+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 227.69999999999998863131622783839702606201171875,
    "points_in_zone": 2,
    "first_point": {
        "ts": "2026-09-01T19:01:40+00:00",
        "lat": 59.8818466999999969857526593841612339019775390625,
        "lon": 30.2268432999999987487171893008053302764892578125
    },
    "last_point": {
        "ts": "2026-09-01T22:49:24+00:00",
        "lat": 59.88187330000000230256773647852241992950439453125,
        "lon": 30.226936699999999547117113252170383930206298828125
    }
}
Methodology: 2026.01.18
Zone Dwell Ust-Luga/St. Petersburg Approach
Sep 1, 2026 18:43 UTC 80.0% ▼
  • Zone: Ust-Luga/St. Petersburg Approach
  • Duration: 4h 5m
  • Data Points: 3 AIS positions
  • Period: 2026-09-01T18:43:56+00:00 to 2026-09-01T22:49:24+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 245.5,
    "points_in_zone": 3,
    "first_point": {
        "ts": "2026-09-01T18:43:56+00:00",
        "lat": 59.8818466999999969857526593841612339019775390625,
        "lon": 30.2268432999999987487171893008053302764892578125
    },
    "last_point": {
        "ts": "2026-09-01T22:49:24+00:00",
        "lat": 59.88187330000000230256773647852241992950439453125,
        "lon": 30.226936699999999547117113252170383930206298828125
    }
}
Methodology: 2026.01.18
Zone Dwell Ust-Luga/St. Petersburg Approach
Aug 31, 2026 09:59 UTC 80.0% ▼
  • Zone: Ust-Luga/St. Petersburg Approach
  • Duration: 1h 22m
  • Data Points: 4 AIS positions
  • Period: 2026-08-31T09:59:29+00:00 to 2026-08-31T11:21:50+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 82.2999999999999971578290569595992565155029296875,
    "points_in_zone": 4,
    "first_point": {
        "ts": "2026-08-31T09:59:29+00:00",
        "lat": 59.881810000000001537046045996248722076416015625,
        "lon": 30.22687499999999971578290569595992565155029296875
    },
    "last_point": {
        "ts": "2026-08-31T11:21:50+00:00",
        "lat": 59.881810000000001537046045996248722076416015625,
        "lon": 30.22687499999999971578290569595992565155029296875
    }
}
Methodology: 2026.01.18
Zone Dwell Ust-Luga/St. Petersburg Approach
Aug 31, 2026 06:33 UTC 80.0% ▼
  • Zone: Ust-Luga/St. Petersburg Approach
  • Duration: 4h 47m
  • Data Points: 5 AIS positions
  • Period: 2026-08-31T06:33:55+00:00 to 2026-08-31T11:21:50+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 287.8999999999999772626324556767940521240234375,
    "points_in_zone": 5,
    "first_point": {
        "ts": "2026-08-31T06:33:55+00:00",
        "lat": 59.8820333000000033507603802718222141265869140625,
        "lon": 30.226666699999999110559656401164829730987548828125
    },
    "last_point": {
        "ts": "2026-08-31T11:21:50+00:00",
        "lat": 59.881810000000001537046045996248722076416015625,
        "lon": 30.22687499999999971578290569595992565155029296875
    }
}
Methodology: 2026.01.18
Zone Dwell Ust-Luga/St. Petersburg Approach
Aug 31, 2026 05:40 UTC 80.0% ▼
  • Zone: Ust-Luga/St. Petersburg Approach
  • Duration: 5h 41m
  • Data Points: 6 AIS positions
  • Period: 2026-08-31T05:40:03+00:00 to 2026-08-31T11:21:50+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 341.80000000000001136868377216160297393798828125,
    "points_in_zone": 6,
    "first_point": {
        "ts": "2026-08-31T05:40:03+00:00",
        "lat": 59.88190999999999775127434986643493175506591796875,
        "lon": 30.2268550000000004729372449219226837158203125
    },
    "last_point": {
        "ts": "2026-08-31T11:21:50+00:00",
        "lat": 59.881810000000001537046045996248722076416015625,
        "lon": 30.22687499999999971578290569595992565155029296875
    }
}
Methodology: 2026.01.18
Zone Dwell Ust-Luga/St. Petersburg Approach
Aug 31, 2026 04:14 UTC 80.0% ▼
  • Zone: Ust-Luga/St. Petersburg Approach
  • Duration: 6h 34m
  • Data Points: 7 AIS positions
  • Period: 2026-08-31T04:14:09+00:00 to 2026-08-31T10:48:56+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 394.80000000000001136868377216160297393798828125,
    "points_in_zone": 7,
    "first_point": {
        "ts": "2026-08-31T04:14:09+00:00",
        "lat": 59.88190999999999775127434986643493175506591796875,
        "lon": 30.2268550000000004729372449219226837158203125
    },
    "last_point": {
        "ts": "2026-08-31T10:48:56+00:00",
        "lat": 59.881810000000001537046045996248722076416015625,
        "lon": 30.22687499999999971578290569595992565155029296875
    }
}
Methodology: 2026.01.18
Zone Dwell Ust-Luga/St. Petersburg Approach
Aug 31, 2026 03:11 UTC 80.0% ▼
  • Zone: Ust-Luga/St. Petersburg Approach
  • Duration: 6h 8m
  • Data Points: 6 AIS positions
  • Period: 2026-08-31T03:51:10+00:00 to 2026-08-31T09:59:29+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 368.30000000000001136868377216160297393798828125,
    "points_in_zone": 6,
    "first_point": {
        "ts": "2026-08-31T03:51:10+00:00",
        "lat": 59.88199999999999789679350215010344982147216796875,
        "lon": 30.2268432999999987487171893008053302764892578125
    },
    "last_point": {
        "ts": "2026-08-31T09:59:29+00:00",
        "lat": 59.881810000000001537046045996248722076416015625,
        "lon": 30.22687499999999971578290569595992565155029296875
    }
}
Methodology: 2026.01.18
Zone Dwell Ust-Luga/St. Petersburg Approach
Aug 31, 2026 02:36 UTC 80.0% ▼
  • Zone: Ust-Luga/St. Petersburg Approach
  • Duration: 3h 57m
  • Data Points: 7 AIS positions
  • Period: 2026-08-31T02:36:52+00:00 to 2026-08-31T06:33:55+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 237.099999999999994315658113919198513031005859375,
    "points_in_zone": 7,
    "first_point": {
        "ts": "2026-08-31T02:36:52+00:00",
        "lat": 59.88191669999999788842615089379251003265380859375,
        "lon": 30.22691329999999965139068081043660640716552734375
    },
    "last_point": {
        "ts": "2026-08-31T06:33:55+00:00",
        "lat": 59.8820333000000033507603802718222141265869140625,
        "lon": 30.226666699999999110559656401164829730987548828125
    }
}
Methodology: 2026.01.18
Zone Dwell Ust-Luga/St. Petersburg Approach
Aug 31, 2026 01:08 UTC 80.0% ▼
  • Zone: Ust-Luga/St. Petersburg Approach
  • Duration: 5h 25m
  • Data Points: 9 AIS positions
  • Period: 2026-08-31T01:08:39+00:00 to 2026-08-31T06:33:55+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 325.30000000000001136868377216160297393798828125,
    "points_in_zone": 9,
    "first_point": {
        "ts": "2026-08-31T01:08:39+00:00",
        "lat": 59.8818150000000031241143005900084972381591796875,
        "lon": 30.226998300000001762555257300846278667449951171875
    },
    "last_point": {
        "ts": "2026-08-31T06:33:55+00:00",
        "lat": 59.8820333000000033507603802718222141265869140625,
        "lon": 30.226666699999999110559656401164829730987548828125
    }
}
Methodology: 2026.01.18
Zone Dwell Ust-Luga/St. Petersburg Approach
Aug 30, 2026 23:47 UTC 80.0% ▼
  • Zone: Ust-Luga/St. Petersburg Approach
  • Duration: 5h 52m
  • Data Points: 9 AIS positions
  • Period: 2026-08-30T23:47:55+00:00 to 2026-08-31T05:40:03+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 352.1000000000000227373675443232059478759765625,
    "points_in_zone": 9,
    "first_point": {
        "ts": "2026-08-30T23:47:55+00:00",
        "lat": 59.8818150000000031241143005900084972381591796875,
        "lon": 30.226998300000001762555257300846278667449951171875
    },
    "last_point": {
        "ts": "2026-08-31T05:40:03+00:00",
        "lat": 59.88190999999999775127434986643493175506591796875,
        "lon": 30.2268550000000004729372449219226837158203125
    }
}
Methodology: 2026.01.18
Zone Dwell Ust-Luga/St. Petersburg Approach
Aug 30, 2026 21:21 UTC 80.0% ▼
  • Zone: Ust-Luga/St. Petersburg Approach
  • Duration: 6h 29m
  • Data Points: 7 AIS positions
  • Period: 2026-08-30T21:21:17+00:00 to 2026-08-31T03:51:10+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 389.8999999999999772626324556767940521240234375,
    "points_in_zone": 7,
    "first_point": {
        "ts": "2026-08-30T21:21:17+00:00",
        "lat": 59.8818899999999985084286890923976898193359375,
        "lon": 30.226893300000000408545020036399364471435546875
    },
    "last_point": {
        "ts": "2026-08-31T03:51:10+00:00",
        "lat": 59.88199999999999789679350215010344982147216796875,
        "lon": 30.2268432999999987487171893008053302764892578125
    }
}
Methodology: 2026.01.18
Zone Dwell Ust-Luga/St. Petersburg Approach
Aug 30, 2026 20:37 UTC 80.0% ▼
  • Zone: Ust-Luga/St. Petersburg Approach
  • Duration: 5h 59m
  • Data Points: 6 AIS positions
  • Period: 2026-08-30T20:37:18+00:00 to 2026-08-31T02:36:52+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 359.6000000000000227373675443232059478759765625,
    "points_in_zone": 6,
    "first_point": {
        "ts": "2026-08-30T20:37:18+00:00",
        "lat": 59.8818899999999985084286890923976898193359375,
        "lon": 30.226893300000000408545020036399364471435546875
    },
    "last_point": {
        "ts": "2026-08-31T02:36:52+00:00",
        "lat": 59.88191669999999788842615089379251003265380859375,
        "lon": 30.22691329999999965139068081043660640716552734375
    }
}
Methodology: 2026.01.18
Sts🛰️? Ust-Luga/St. Petersburg Approach
Aug 30, 2026 19:26 UTC 75/100 ▼
Vessel A: IMO 8230728 (VOLGONEFT 128) RUSSIA
Vessel B: Solstraum (SOLSTRAUM) Russia
  • Minimum Distance: 213 meters
  • Average Distance: 221 meters
  • Duration: 1h 10m
  • Period: 2026-08-30T19:26:28+00:00 to 2026-08-30T20:37:18+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Ust-Luga/St. Petersburg Approach

Confidence Analysis

Score: 75/100

Moderate-confidence STS candidate. Two tankers (VOLGONEFT 128 and SOLSTRAUM) maintained close proximity (min 213m, avg 221m) for 71 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Ust-Luga/St. Petersburg Approach, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness15/25Min distance 213m, avg 221m
Duration15/25Duration 71 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±11m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Ust-Luga/St. Petersburg Approach

🛰️ Satellite Corroboration

? SAR Inconclusive

Satellite imagery available but requires review

Preview available for manual review

Scene: S1D_IW_GRDH_1SDV_20260830T153136_20260830T153201_004357_0080BA_ED1B_COG • Acquired: 2026-08-30T15:31:36.144504Z • Platform: sentinel-1d
SAR satellite preview for event 1170102

Click image to view full size

Searched: 2026-08-30T21:45:02.054023+00:00

Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273437610,
        "imo": 8230728,
        "name": "VOLGONEFT 128",
        "flag": "RUSSIA"
    },
    "vessel_b": {
        "mmsi": 273291710,
        "imo": 9157014,
        "name": "SOLSTRAUM",
        "flag": "Russia"
    },
    "min_distance_m": 212.69999999999998863131622783839702606201171875,
    "avg_distance_m": 220.599999999999994315658113919198513031005859375,
    "distance_consistency_m": 11.0999999999999996447286321199499070644378662109375,
    "duration_minutes": 70.7999999999999971578290569595992565155029296875,
    "overlap_duration_s": 4250,
    "speed_a_avg": 0,
    "speed_a_std": 0,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0,
            "max_sog": 0
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-08-30T19:26:28+00:00",
        "end": "2026-08-30T20:37:18+00:00"
    },
    "points_count": {
        "vessel_a": 2,
        "vessel_b": 2
    },
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "score": {
        "value": 75,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 213m, avg 221m"
            },
            "duration": {
                "score": 15,
                "max": 25,
                "detail": "Duration 71 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b111m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Ust-Luga\/St. Petersburg Approach"
            }
        },
        "summary": "Moderate-confidence STS candidate. Two tankers (VOLGONEFT 128 and SOLSTRAUM) maintained close proximity (min 213m, avg 221m) for 71 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Ust-Luga\/St. Petersburg Approach, a known STS activity area."
    },
    "sar": {
        "status": "inconclusive",
        "centroid": {
            "lat": 59.8827471000000031153831514529883861541748046875,
            "lon": 30.225676199999998772227627341635525226593017578125
        },
        "time_window": {
            "start_ts": "2026-08-30T19:26:28+00:00",
            "end_ts": "2026-08-30T20:37:18+00:00"
        },
        "searched_at": "2026-08-30T21:45:02.054023+00:00",
        "scene_id": "S1D_IW_GRDH_1SDV_20260830T153136_20260830T153201_004357_0080BA_ED1B_COG",
        "scene_datetime": "2026-08-30T15:31:36.144504Z",
        "platform": "sentinel-1d",
        "bbox": {
            "min_lon": 29.001000999999998697376213385723531246185302734375,
            "min_lat": 59.5085830000000015616024029441177845001220703125,
            "max_lon": 34.32946799999999853980625630356371402740478515625,
            "max_lat": 61.43689299999999775536707602441310882568359375
        },
        "assets": {
            "preview_url": "https:\/\/fleetleaks.com\/wp-content\/uploads\/fleetleaks-evidence\/sar-imagery\/2026\/08\/event_1170102_thumbnail_20260830214506.png",
            "stored_path": "\/home\/fleetleaks\/public_html\/wp-content\/uploads\/fleetleaks-evidence\/sar-imagery\/2026\/08\/event_1170102_thumbnail_20260830214506.png",
            "source": "copernicus_dataspace"
        },
        "notes": "Preview available for manual review"
    }
}
Methodology: 2026.01.18
Zone Dwell Ust-Luga/St. Petersburg Approach
Aug 30, 2026 19:01 UTC 80.0% ▼
  • Zone: Ust-Luga/St. Petersburg Approach
  • Duration: 6h 36m
  • Data Points: 9 AIS positions
  • Period: 2026-08-30T19:01:10+00:00 to 2026-08-31T01:37:56+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 396.80000000000001136868377216160297393798828125,
    "points_in_zone": 9,
    "first_point": {
        "ts": "2026-08-30T19:01:10+00:00",
        "lat": 59.8819816999999972040313878096640110015869140625,
        "lon": 30.226936699999999547117113252170383930206298828125
    },
    "last_point": {
        "ts": "2026-08-31T01:37:56+00:00",
        "lat": 59.8818449999999984356691129505634307861328125,
        "lon": 30.2270299999999991769072948954999446868896484375
    }
}
Methodology: 2026.01.18
Zone Dwell Ust-Luga/St. Petersburg Approach
Aug 30, 2026 15:03 UTC 80.0% ▼
  • Zone: Ust-Luga/St. Petersburg Approach
  • Duration: 6h 18m
  • Data Points: 9 AIS positions
  • Period: 2026-08-30T15:03:03+00:00 to 2026-08-30T21:21:17+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 378.19999999999998863131622783839702606201171875,
    "points_in_zone": 9,
    "first_point": {
        "ts": "2026-08-30T15:03:03+00:00",
        "lat": 59.88196330000000244808688876219093799591064453125,
        "lon": 30.22686829999999957863110466860234737396240234375
    },
    "last_point": {
        "ts": "2026-08-30T21:21:17+00:00",
        "lat": 59.8818899999999985084286890923976898193359375,
        "lon": 30.226893300000000408545020036399364471435546875
    }
}
Methodology: 2026.01.18
Zone Dwell Ust-Luga/St. Petersburg Approach
Aug 30, 2026 14:05 UTC 80.0% ▼
  • Zone: Ust-Luga/St. Petersburg Approach
  • Duration: 6h 31m
  • Data Points: 10 AIS positions
  • Period: 2026-08-30T14:05:40+00:00 to 2026-08-30T20:37:18+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 391.6000000000000227373675443232059478759765625,
    "points_in_zone": 10,
    "first_point": {
        "ts": "2026-08-30T14:05:40+00:00",
        "lat": 59.8819567000000034795448300428688526153564453125,
        "lon": 30.22704829999999986966940923593938350677490234375
    },
    "last_point": {
        "ts": "2026-08-30T20:37:18+00:00",
        "lat": 59.8818899999999985084286890923976898193359375,
        "lon": 30.226893300000000408545020036399364471435546875
    }
}
Methodology: 2026.01.18
Loiter Ust-Luga/St. Petersburg Approach
Aug 30, 2026 14:05 UTC 75.0% ▼
  • Duration: 6h 31m
  • Radius: 10 meters
  • Data Points: 10 AIS positions
  • Centroid: 59.8820, 30.2269
  • Zone: Ust-Luga/St. Petersburg Approach
Show Raw Evidence JSON
{
    "radius_m": 10.300000000000000710542735760100185871124267578125,
    "duration_minutes": 391.6000000000000227373675443232059478759765625,
    "points": 10,
    "centroid": {
        "lat": 59.8819800099999923759241937659680843353271484375,
        "lon": 30.22693848000000116371666081249713897705078125
    },
    "bbox": {
        "min_lat": 59.8818899999999985084286890923976898193359375,
        "min_lon": 30.22686829999999957863110466860234737396240234375,
        "max_lat": 59.8820716999999973495505400933325290679931640625,
        "max_lon": 30.22704829999999986966940923593938350677490234375
    },
    "zone_id": "russia_ust_luga_approach"
}
Methodology: 2026.01.18
Zone Dwell Ust-Luga/St. Petersburg Approach
Aug 30, 2026 13:11 UTC 80.0% ▼
  • Zone: Ust-Luga/St. Petersburg Approach
  • Duration: 6h 34m
  • Data Points: 13 AIS positions
  • Period: 2026-08-30T13:22:21+00:00 to 2026-08-30T19:57:03+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 394.69999999999998863131622783839702606201171875,
    "points_in_zone": 13,
    "first_point": {
        "ts": "2026-08-30T13:22:21+00:00",
        "lat": 59.8819567000000034795448300428688526153564453125,
        "lon": 30.22704829999999986966940923593938350677490234375
    },
    "last_point": {
        "ts": "2026-08-30T19:57:03+00:00",
        "lat": 59.8819816999999972040313878096640110015869140625,
        "lon": 30.226953300000001689795681159012019634246826171875
    }
}
Methodology: 2026.01.18
Loiter Ust-Luga/St. Petersburg Approach
Aug 30, 2026 13:11 UTC 75.0% ▼
  • Duration: 6h 34m
  • Radius: 10 meters
  • Data Points: 13 AIS positions
  • Centroid: 59.8820, 30.2270
  • Zone: Ust-Luga/St. Petersburg Approach
Show Raw Evidence JSON
{
    "radius_m": 10.300000000000000710542735760100185871124267578125,
    "duration_minutes": 394.69999999999998863131622783839702606201171875,
    "points": 13,
    "centroid": {
        "lat": 59.88197976153845303315392811782658100128173828125,
        "lon": 30.22697574615384752405589097179472446441650390625
    },
    "bbox": {
        "min_lat": 59.8819567000000034795448300428688526153564453125,
        "min_lon": 30.22686829999999957863110466860234737396240234375,
        "max_lat": 59.8820716999999973495505400933325290679931640625,
        "max_lon": 30.22704829999999986966940923593938350677490234375
    },
    "zone_id": "russia_ust_luga_approach"
}
Methodology: 2026.01.18
Zone Dwell Ust-Luga/St. Petersburg Approach
Aug 30, 2026 12:11 UTC 80.0% ▼
  • Zone: Ust-Luga/St. Petersburg Approach
  • Duration: 6h 33m
  • Data Points: 14 AIS positions
  • Period: 2026-08-30T12:53:30+00:00 to 2026-08-30T19:26:28+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 393,
    "points_in_zone": 14,
    "first_point": {
        "ts": "2026-08-30T12:53:30+00:00",
        "lat": 59.88191830000000237532731262035667896270751953125,
        "lon": 30.226883300000000787122189649380743503570556640625
    },
    "last_point": {
        "ts": "2026-08-30T19:26:28+00:00",
        "lat": 59.8820716999999973495505400933325290679931640625,
        "lon": 30.226949999999998652810972998850047588348388671875
    }
}
Methodology: 2026.01.18
Loiter Ust-Luga/St. Petersburg Approach
Aug 30, 2026 12:11 UTC 75.0% ▼
  • Duration: 6h 33m
  • Radius: 12 meters
  • Data Points: 14 AIS positions
  • Centroid: 59.8820, 30.2270
  • Zone: Ust-Luga/St. Petersburg Approach
Show Raw Evidence JSON
{
    "radius_m": 12.199999999999999289457264239899814128875732421875,
    "duration_minutes": 393,
    "points": 14,
    "centroid": {
        "lat": 59.88196262857143636892942595295608043670654296875,
        "lon": 30.226971164285711068941964185796678066253662109375
    },
    "bbox": {
        "min_lat": 59.88191830000000237532731262035667896270751953125,
        "min_lon": 30.22686829999999957863110466860234737396240234375,
        "max_lat": 59.8820716999999973495505400933325290679931640625,
        "max_lon": 30.22704829999999986966940923593938350677490234375
    },
    "zone_id": "russia_ust_luga_approach"
}
Methodology: 2026.01.18
Zone Dwell Ust-Luga/St. Petersburg Approach
Aug 30, 2026 11:05 UTC 80.0% ▼
  • Zone: Ust-Luga/St. Petersburg Approach
  • Duration: 4h 41m
  • Data Points: 22 AIS positions
  • Period: 2026-08-30T11:05:16+00:00 to 2026-08-30T15:46:27+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 281.19999999999998863131622783839702606201171875,
    "points_in_zone": 22,
    "first_point": {
        "ts": "2026-08-30T11:05:16+00:00",
        "lat": 59.88191830000000237532731262035667896270751953125,
        "lon": 30.226883300000000787122189649380743503570556640625
    },
    "last_point": {
        "ts": "2026-08-30T15:46:27+00:00",
        "lat": 59.88196330000000244808688876219093799591064453125,
        "lon": 30.22686829999999957863110466860234737396240234375
    }
}
Methodology: 2026.01.18
Loiter Ust-Luga/St. Petersburg Approach
Aug 30, 2026 11:05 UTC 75.0% ▼
  • Duration: 4h 41m
  • Radius: 7 meters
  • Data Points: 22 AIS positions
  • Centroid: 59.8819, 30.2269
  • Zone: Ust-Luga/St. Petersburg Approach
Show Raw Evidence JSON
{
    "radius_m": 6.79999999999999982236431605997495353221893310546875,
    "duration_minutes": 281.19999999999998863131622783839702606201171875,
    "points": 22,
    "centroid": {
        "lat": 59.8819366545454840888851322233676910400390625,
        "lon": 30.22693375454544906233422807417809963226318359375
    },
    "bbox": {
        "min_lat": 59.88191830000000237532731262035667896270751953125,
        "min_lon": 30.22686829999999957863110466860234737396240234375,
        "max_lat": 59.88196330000000244808688876219093799591064453125,
        "max_lon": 30.22704829999999986966940923593938350677490234375
    },
    "zone_id": "russia_ust_luga_approach"
}
Methodology: 2026.01.18
Zone Dwell Ust-Luga/St. Petersburg Approach
Aug 30, 2026 10:44 UTC 80.0% ▼
  • Zone: Ust-Luga/St. Petersburg Approach
  • Duration: 5h 2m
  • Data Points: 26 AIS positions
  • Period: 2026-08-30T10:44:21+00:00 to 2026-08-30T15:46:27+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 302.1000000000000227373675443232059478759765625,
    "points_in_zone": 26,
    "first_point": {
        "ts": "2026-08-30T10:44:21+00:00",
        "lat": 59.88191830000000237532731262035667896270751953125,
        "lon": 30.226883300000000787122189649380743503570556640625
    },
    "last_point": {
        "ts": "2026-08-30T15:46:27+00:00",
        "lat": 59.88196330000000244808688876219093799591064453125,
        "lon": 30.22686829999999957863110466860234737396240234375
    }
}
Methodology: 2026.01.18
Loiter Ust-Luga/St. Petersburg Approach
Aug 30, 2026 10:44 UTC 75.0% ▼
  • Duration: 5h 2m
  • Radius: 7 meters
  • Data Points: 26 AIS positions
  • Centroid: 59.8819, 30.2269
  • Zone: Ust-Luga/St. Petersburg Approach
Show Raw Evidence JSON
{
    "radius_m": 7.29999999999999982236431605997495353221893310546875,
    "duration_minutes": 302.1000000000000227373675443232059478759765625,
    "points": 26,
    "centroid": {
        "lat": 59.88193383076926323838051757775247097015380859375,
        "lon": 30.226925992307688062510351301170885562896728515625
    },
    "bbox": {
        "min_lat": 59.88191830000000237532731262035667896270751953125,
        "min_lon": 30.22686829999999957863110466860234737396240234375,
        "max_lat": 59.88196330000000244808688876219093799591064453125,
        "max_lon": 30.22704829999999986966940923593938350677490234375
    },
    "zone_id": "russia_ust_luga_approach"
}
Methodology: 2026.01.18
Zone Dwell Ust-Luga/St. Petersburg Approach
Aug 30, 2026 09:50 UTC 80.0% ▼
  • Zone: Ust-Luga/St. Petersburg Approach
  • Duration: 5h 56m
  • Data Points: 27 AIS positions
  • Period: 2026-08-30T09:50:24+00:00 to 2026-08-30T15:46:27+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 356.1000000000000227373675443232059478759765625,
    "points_in_zone": 27,
    "first_point": {
        "ts": "2026-08-30T09:50:24+00:00",
        "lat": 59.88191830000000237532731262035667896270751953125,
        "lon": 30.226883300000000787122189649380743503570556640625
    },
    "last_point": {
        "ts": "2026-08-30T15:46:27+00:00",
        "lat": 59.88196330000000244808688876219093799591064453125,
        "lon": 30.22686829999999957863110466860234737396240234375
    }
}
Methodology: 2026.01.18
Loiter Ust-Luga/St. Petersburg Approach
Aug 30, 2026 09:50 UTC 75.0% ▼
  • Duration: 5h 56m
  • Radius: 7 meters
  • Data Points: 27 AIS positions
  • Centroid: 59.8819, 30.2269
  • Zone: Ust-Luga/St. Petersburg Approach
Show Raw Evidence JSON
{
    "radius_m": 7.4000000000000003552713678800500929355621337890625,
    "duration_minutes": 356.1000000000000227373675443232059478759765625,
    "points": 27,
    "centroid": {
        "lat": 59.88193325555558743644724017940461635589599609375,
        "lon": 30.226924411111102841687170439399778842926025390625
    },
    "bbox": {
        "min_lat": 59.88191830000000237532731262035667896270751953125,
        "min_lon": 30.22686829999999957863110466860234737396240234375,
        "max_lat": 59.88196330000000244808688876219093799591064453125,
        "max_lon": 30.22704829999999986966940923593938350677490234375
    },
    "zone_id": "russia_ust_luga_approach"
}
Methodology: 2026.01.18
Zone Dwell Ust-Luga/St. Petersburg Approach
Aug 30, 2026 08:00 UTC 80.0% ▼
  • Zone: Ust-Luga/St. Petersburg Approach
  • Duration: 6h 20m
  • Data Points: 27 AIS positions
  • Period: 2026-08-30T08:55:40+00:00 to 2026-08-30T15:16:35+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 380.8999999999999772626324556767940521240234375,
    "points_in_zone": 27,
    "first_point": {
        "ts": "2026-08-30T08:55:40+00:00",
        "lat": 59.88200499999999948386175674386322498321533203125,
        "lon": 30.22682830000000109293978312052786350250244140625
    },
    "last_point": {
        "ts": "2026-08-30T15:16:35+00:00",
        "lat": 59.88196330000000244808688876219093799591064453125,
        "lon": 30.22686829999999957863110466860234737396240234375
    }
}
Methodology: 2026.01.18
Loiter Ust-Luga/St. Petersburg Approach
Aug 30, 2026 08:00 UTC 75.0% ▼
  • Duration: 6h 20m
  • Radius: 9 meters
  • Data Points: 27 AIS positions
  • Centroid: 59.8819, 30.2269
  • Zone: Ust-Luga/St. Petersburg Approach
Show Raw Evidence JSON
{
    "radius_m": 9.4000000000000003552713678800500929355621337890625,
    "duration_minutes": 380.8999999999999772626324556767940521240234375,
    "points": 27,
    "centroid": {
        "lat": 59.88193480000003177110556862317025661468505859375,
        "lon": 30.226922929629626679570719716139137744903564453125
    },
    "bbox": {
        "min_lat": 59.88191830000000237532731262035667896270751953125,
        "min_lon": 30.22682830000000109293978312052786350250244140625,
        "max_lat": 59.88200499999999948386175674386322498321533203125,
        "max_lon": 30.22704829999999986966940923593938350677490234375
    },
    "zone_id": "russia_ust_luga_approach"
}
Methodology: 2026.01.18
Sts🛰️? Ust-Luga/St. Petersburg Approach
Aug 30, 2026 07:34 UTC 55/100 ▼
Vessel A: Ryazan (RYAZAN) RUSSIA
Vessel B: IMO 8230728 (VOLGONEFT 128) RUSSIA
  • Minimum Distance: 218 meters
  • Average Distance: 274 meters
  • Duration: 38 minutes
  • Period: 2026-08-30T07:34:34+00:00 to 2026-08-30T08:12:53+00:00
  • Vessel A Avg Speed: 0.3 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Ust-Luga/St. Petersburg Approach

Confidence Analysis

Score: 55/100

Low-confidence STS candidate - may warrant review. Two tankers (RYAZAN and VOLGONEFT 128) maintained close proximity (min 218m, avg 274m) for 38 minutes. Both vessels were slow-moving (avg speeds 0.3 and 0.0 knots). Moderate distance variation observed during the encounter. Event occurred in Ust-Luga/St. Petersburg Approach, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness15/25Min distance 218m, avg 274m
Duration5/25Duration 38 minutes
Speed Stability17/20both nearly stationary; stable speeds
Distance Consistency8/15Distance variance ±98m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Ust-Luga/St. Petersburg Approach

🛰️ Satellite Corroboration

? SAR Inconclusive

Satellite imagery available but requires review

Preview available for manual review

Scene: S1D_IW_GRDH_1SDV_20260830T041653_20260830T041718_004350_00807C_AC9F_COG • Acquired: 2026-08-30T04:16:53.836340Z • Platform: sentinel-1d
SAR satellite preview for event 1168098

Click image to view full size

Searched: 2026-08-30T14:00:13.284855+00:00

Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273357610,
        "imo": 8915548,
        "name": "RYAZAN",
        "flag": "RUSSIA"
    },
    "vessel_b": {
        "mmsi": 273437610,
        "imo": 8230728,
        "name": "VOLGONEFT 128",
        "flag": "RUSSIA"
    },
    "min_distance_m": 217.599999999999994315658113919198513031005859375,
    "avg_distance_m": 273.80000000000001136868377216160297393798828125,
    "distance_consistency_m": 98.2000000000000028421709430404007434844970703125,
    "duration_minutes": 38.2999999999999971578290569595992565155029296875,
    "overlap_duration_s": 2299,
    "speed_a_avg": 0.320000000000000006661338147750939242541790008544921875,
    "speed_a_std": 0.38000000000000000444089209850062616169452667236328125,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.320000000000000006661338147750939242541790008544921875,
            "max_sog": 1
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-08-30T07:34:34+00:00",
        "end": "2026-08-30T08:12:53+00:00"
    },
    "points_count": {
        "vessel_a": 5,
        "vessel_b": 5
    },
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "score": {
        "value": 55,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 218m, avg 274m"
            },
            "duration": {
                "score": 5,
                "max": 25,
                "detail": "Duration 38 minutes"
            },
            "speed_stability": {
                "score": 17,
                "max": 20,
                "detail": "both nearly stationary; stable speeds"
            },
            "distance_consistency": {
                "score": 8,
                "max": 15,
                "detail": "Distance variance \u00b198m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Ust-Luga\/St. Petersburg Approach"
            }
        },
        "summary": "Low-confidence STS candidate - may warrant review. Two tankers (RYAZAN and VOLGONEFT 128) maintained close proximity (min 218m, avg 274m) for 38 minutes. Both vessels were slow-moving (avg speeds 0.3 and 0.0 knots). Moderate distance variation observed during the encounter. Event occurred in Ust-Luga\/St. Petersburg Approach, a known STS activity area."
    },
    "sar": {
        "status": "inconclusive",
        "centroid": {
            "lat": 59.8829958000000033280230127274990081787109375,
            "lon": 30.225671500000000690988599671982228755950927734375
        },
        "time_window": {
            "start_ts": "2026-08-30T07:34:34+00:00",
            "end_ts": "2026-08-30T08:12:53+00:00"
        },
        "searched_at": "2026-08-30T14:00:13.284855+00:00",
        "scene_id": "S1D_IW_GRDH_1SDV_20260830T041653_20260830T041718_004350_00807C_AC9F_COG",
        "scene_datetime": "2026-08-30T04:16:53.836340Z",
        "platform": "sentinel-1d",
        "bbox": {
            "min_lon": 28.508894000000001511807568022049963474273681640625,
            "min_lat": 58.78304299999999926740201772190630435943603515625,
            "max_lon": 33.7275240000000025020199245773255825042724609375,
            "max_lat": 60.70922500000000354702933691442012786865234375
        },
        "assets": {
            "preview_url": "https:\/\/fleetleaks.com\/wp-content\/uploads\/fleetleaks-evidence\/sar-imagery\/2026\/08\/event_1168098_thumbnail_20260830140017.png",
            "stored_path": "\/home\/fleetleaks\/public_html\/wp-content\/uploads\/fleetleaks-evidence\/sar-imagery\/2026\/08\/event_1168098_thumbnail_20260830140017.png",
            "source": "copernicus_dataspace"
        },
        "notes": "Preview available for manual review"
    }
}
Methodology: 2026.01.18
Zone Dwell Ust-Luga/St. Petersburg Approach
Aug 30, 2026 07:04 UTC 80.0% ▼
  • Zone: Ust-Luga/St. Petersburg Approach
  • Duration: 6h 27m
  • Data Points: 32 AIS positions
  • Period: 2026-08-30T07:42:30+00:00 to 2026-08-30T14:10:20+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 387.80000000000001136868377216160297393798828125,
    "points_in_zone": 32,
    "first_point": {
        "ts": "2026-08-30T07:42:30+00:00",
        "lat": 59.88191499999999933834260446019470691680908203125,
        "lon": 30.226846699999999401597960968501865863800048828125
    },
    "last_point": {
        "ts": "2026-08-30T14:10:20+00:00",
        "lat": 59.8819567000000034795448300428688526153564453125,
        "lon": 30.22704829999999986966940923593938350677490234375
    }
}
Methodology: 2026.01.18
Loiter Ust-Luga/St. Petersburg Approach
Aug 30, 2026 07:04 UTC 75.0% ▼
  • Duration: 6h 27m
  • Radius: 8 meters
  • Data Points: 32 AIS positions
  • Centroid: 59.8819, 30.2269
  • Zone: Ust-Luga/St. Petersburg Approach
Show Raw Evidence JSON
{
    "radius_m": 8.199999999999999289457264239899814128875732421875,
    "duration_minutes": 387.80000000000001136868377216160297393798828125,
    "points": 32,
    "centroid": {
        "lat": 59.881942750000035857738112099468708038330078125,
        "lon": 30.226906793750007551579983555711805820465087890625
    },
    "bbox": {
        "min_lat": 59.88191499999999933834260446019470691680908203125,
        "min_lon": 30.22682830000000109293978312052786350250244140625,
        "max_lat": 59.88200499999999948386175674386322498321533203125,
        "max_lon": 30.22704829999999986966940923593938350677490234375
    },
    "zone_id": "russia_ust_luga_approach"
}
Methodology: 2026.01.18
Zone Dwell Ust-Luga/St. Petersburg Approach
Aug 30, 2026 06:08 UTC 80.0% ▼
  • Zone: Ust-Luga/St. Petersburg Approach
  • Duration: 6h 26m
  • Data Points: 32 AIS positions
  • Period: 2026-08-30T06:47:54+00:00 to 2026-08-30T13:14:26+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 386.5,
    "points_in_zone": 32,
    "first_point": {
        "ts": "2026-08-30T06:47:54+00:00",
        "lat": 59.88200499999999948386175674386322498321533203125,
        "lon": 30.226833299999999127294358913786709308624267578125
    },
    "last_point": {
        "ts": "2026-08-30T13:14:26+00:00",
        "lat": 59.8819567000000034795448300428688526153564453125,
        "lon": 30.22704829999999986966940923593938350677490234375
    }
}
Methodology: 2026.01.18
Loiter Ust-Luga/St. Petersburg Approach
Aug 30, 2026 06:08 UTC 75.0% ▼
  • Duration: 6h 26m
  • Radius: 10 meters
  • Data Points: 32 AIS positions
  • Centroid: 59.8819, 30.2269
  • Zone: Ust-Luga/St. Petersburg Approach
Show Raw Evidence JSON
{
    "radius_m": 10.300000000000000710542735760100185871124267578125,
    "duration_minutes": 386.5,
    "points": 32,
    "centroid": {
        "lat": 59.88193774375003641807779786176979541778564453125,
        "lon": 30.226868575000029437660487019456923007965087890625
    },
    "bbox": {
        "min_lat": 59.88191499999999933834260446019470691680908203125,
        "min_lon": 30.22682830000000109293978312052786350250244140625,
        "max_lat": 59.88200499999999948386175674386322498321533203125,
        "max_lon": 30.22704829999999986966940923593938350677490234375
    },
    "zone_id": "russia_ust_luga_approach"
}
Methodology: 2026.01.18
Zone Dwell Ust-Luga/St. Petersburg Approach
Aug 30, 2026 05:04 UTC 80.0% ▼
  • Zone: Ust-Luga/St. Petersburg Approach
  • Duration: 6h 31m
  • Data Points: 31 AIS positions
  • Period: 2026-08-30T05:45:51+00:00 to 2026-08-30T12:17:23+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 391.5,
    "points_in_zone": 31,
    "first_point": {
        "ts": "2026-08-30T05:45:51+00:00",
        "lat": 59.88191499999999933834260446019470691680908203125,
        "lon": 30.226863300000001544276528875343501567840576171875
    },
    "last_point": {
        "ts": "2026-08-30T12:17:23+00:00",
        "lat": 59.88191830000000237532731262035667896270751953125,
        "lon": 30.226883300000000787122189649380743503570556640625
    }
}
Methodology: 2026.01.18
Loiter Ust-Luga/St. Petersburg Approach
Aug 30, 2026 05:04 UTC 75.0% ▼
  • Duration: 6h 31m
  • Radius: 7 meters
  • Data Points: 31 AIS positions
  • Centroid: 59.8819, 30.2269
  • Zone: Ust-Luga/St. Petersburg Approach
Show Raw Evidence JSON
{
    "radius_m": 6.79999999999999982236431605997495353221893310546875,
    "duration_minutes": 391.5,
    "points": 31,
    "centroid": {
        "lat": 59.881945416129070736133144237101078033447265625,
        "lon": 30.22685729354841299709732993505895137786865234375
    },
    "bbox": {
        "min_lat": 59.88191499999999933834260446019470691680908203125,
        "min_lon": 30.22682830000000109293978312052786350250244140625,
        "max_lat": 59.88200499999999948386175674386322498321533203125,
        "max_lon": 30.226883300000000787122189649380743503570556640625
    },
    "zone_id": "russia_ust_luga_approach"
}
Methodology: 2026.01.18
Loiter Ust-Luga/St. Petersburg Approach
Aug 30, 2026 04:34 UTC 75.0% ▼
  • Duration: 6h 30m
  • Radius: 6 meters
  • Data Points: 26 AIS positions
  • Centroid: 59.8820, 30.2269
  • Zone: Ust-Luga/St. Petersburg Approach
Show Raw Evidence JSON
{
    "radius_m": 5.70000000000000017763568394002504646778106689453125,
    "duration_minutes": 390.30000000000001136868377216160297393798828125,
    "points": 26,
    "centroid": {
        "lat": 59.88195563076924798906475189141929149627685546875,
        "lon": 30.2268549846154002125331317074596881866455078125
    },
    "bbox": {
        "min_lat": 59.88191499999999933834260446019470691680908203125,
        "min_lon": 30.22682830000000109293978312052786350250244140625,
        "max_lat": 59.88200499999999948386175674386322498321533203125,
        "max_lon": 30.22691830000000123845893540419638156890869140625
    },
    "zone_id": "russia_ust_luga_approach"
}
Methodology: 2026.01.18
Zone Dwell Ust-Luga/St. Petersburg Approach
Aug 30, 2026 04:34 UTC 80.0% ▼
  • Zone: Ust-Luga/St. Petersburg Approach
  • Duration: 6h 30m
  • Data Points: 26 AIS positions
  • Period: 2026-08-30T04:34:59+00:00 to 2026-08-30T11:05:16+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 390.30000000000001136868377216160297393798828125,
    "points_in_zone": 26,
    "first_point": {
        "ts": "2026-08-30T04:34:59+00:00",
        "lat": 59.881983300000001690932549536228179931640625,
        "lon": 30.22691830000000123845893540419638156890869140625
    },
    "last_point": {
        "ts": "2026-08-30T11:05:16+00:00",
        "lat": 59.88191830000000237532731262035667896270751953125,
        "lon": 30.226883300000000787122189649380743503570556640625
    }
}
Methodology: 2026.01.18
Zone Dwell Ust-Luga/St. Petersburg Approach
Aug 29, 2026 22:36 UTC 80.0% ▼
  • Zone: Ust-Luga/St. Petersburg Approach
  • Duration: 6h 27m
  • Data Points: 4 AIS positions
  • Period: 2026-08-29T22:36:45+00:00 to 2026-08-30T05:04:05+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 387.30000000000001136868377216160297393798828125,
    "points_in_zone": 4,
    "first_point": {
        "ts": "2026-08-29T22:36:45+00:00",
        "lat": 59.88186170000000174695742316544055938720703125,
        "lon": 30.226929999999999409965312224812805652618408203125
    },
    "last_point": {
        "ts": "2026-08-30T05:04:05+00:00",
        "lat": 59.881983300000001690932549536228179931640625,
        "lon": 30.22691830000000123845893540419638156890869140625
    }
}
Methodology: 2026.01.18
Sts🛰️? Ust-Luga/St. Petersburg Approach
Aug 29, 2026 21:40 UTC 75/100 ▼
Vessel A: IMO 8230728 (VOLGONEFT 128) RUSSIA
Vessel B: Thoth (THOTH) Russia
  • Minimum Distance: 219 meters
  • Average Distance: 222 meters
  • Duration: 1h 5m
  • Period: 2026-08-29T21:40:58+00:00 to 2026-08-29T22:46:12+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Ust-Luga/St. Petersburg Approach

Confidence Analysis

Score: 75/100

Moderate-confidence STS candidate. Two tankers (VOLGONEFT 128 and THOTH) maintained close proximity (min 218m, avg 222m) for 65 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Ust-Luga/St. Petersburg Approach, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness15/25Min distance 218m, avg 222m
Duration15/25Duration 65 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±3m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Ust-Luga/St. Petersburg Approach

🛰️ Satellite Corroboration

? SAR Inconclusive

Satellite imagery available but requires review

Preview available for manual review

Scene: S1C_IW_GRDH_1SDV_20260829T153916_20260829T153941_009212_0124DD_1FCD_COG • Acquired: 2026-08-29T15:39:16.746796Z • Platform: sentinel-1c
SAR satellite preview for event 1165666

Click image to view full size

Searched: 2026-08-30T04:00:01.703322+00:00

Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273437610,
        "imo": 8230728,
        "name": "VOLGONEFT 128",
        "flag": "RUSSIA"
    },
    "vessel_b": {
        "mmsi": 273253080,
        "imo": 9164718,
        "name": "THOTH",
        "flag": "Russia"
    },
    "min_distance_m": 218.5,
    "avg_distance_m": 221.80000000000001136868377216160297393798828125,
    "distance_consistency_m": 2.79999999999999982236431605997495353221893310546875,
    "duration_minutes": 65.2000000000000028421709430404007434844970703125,
    "overlap_duration_s": 3914,
    "speed_a_avg": 0,
    "speed_a_std": 0,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0,
            "max_sog": 0
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-08-29T21:40:58+00:00",
        "end": "2026-08-29T22:46:12+00:00"
    },
    "points_count": {
        "vessel_a": 3,
        "vessel_b": 3
    },
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "score": {
        "value": 75,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 218m, avg 222m"
            },
            "duration": {
                "score": 15,
                "max": 25,
                "detail": "Duration 65 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: Ust-Luga\/St. Petersburg Approach"
            }
        },
        "summary": "Moderate-confidence STS candidate. Two tankers (VOLGONEFT 128 and THOTH) maintained close proximity (min 218m, avg 222m) for 65 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Ust-Luga\/St. Petersburg Approach, a known STS activity area."
    },
    "sar": {
        "status": "inconclusive",
        "centroid": {
            "lat": 59.88266840000000001964508555829524993896484375,
            "lon": 30.22572389999999842302713659591972827911376953125
        },
        "time_window": {
            "start_ts": "2026-08-29T21:40:58+00:00",
            "end_ts": "2026-08-29T22:46:12+00:00"
        },
        "searched_at": "2026-08-30T04:00:01.703322+00:00",
        "scene_id": "S1C_IW_GRDH_1SDV_20260829T153916_20260829T153941_009212_0124DD_1FCD_COG",
        "scene_datetime": "2026-08-29T15:39:16.746796Z",
        "platform": "sentinel-1c",
        "bbox": {
            "min_lon": 27.491172999999999859710442251525819301605224609375,
            "min_lat": 58.31375899999999745659806649200618267059326171875,
            "max_lon": 32.63072199999999867259248276241123676300048828125,
            "max_lat": 60.23731599999999986039256327785551548004150390625
        },
        "assets": {
            "preview_url": "https:\/\/fleetleaks.com\/wp-content\/uploads\/fleetleaks-evidence\/sar-imagery\/2026\/08\/event_1165666_thumbnail_20260830040006.png",
            "stored_path": "\/home\/fleetleaks\/public_html\/wp-content\/uploads\/fleetleaks-evidence\/sar-imagery\/2026\/08\/event_1165666_thumbnail_20260830040006.png",
            "source": "copernicus_dataspace"
        },
        "notes": "Preview available for manual review"
    }
}
Methodology: 2026.01.18
Zone Dwell Ust-Luga/St. Petersburg Approach
Aug 29, 2026 21:04 UTC 80.0% ▼
  • Zone: Ust-Luga/St. Petersburg Approach
  • Duration: 1h 41m
  • Data Points: 6 AIS positions
  • Period: 2026-08-29T21:04:49+00:00 to 2026-08-29T22:46:12+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 101.400000000000005684341886080801486968994140625,
    "points_in_zone": 6,
    "first_point": {
        "ts": "2026-08-29T21:04:49+00:00",
        "lat": 59.88186830000000071549948188476264476776123046875,
        "lon": 30.226780000000001535909177619032561779022216796875
    },
    "last_point": {
        "ts": "2026-08-29T22:46:12+00:00",
        "lat": 59.88186170000000174695742316544055938720703125,
        "lon": 30.226929999999999409965312224812805652618408203125
    }
}
Methodology: 2026.01.18
Sts🛰️? Ust-Luga/St. Petersburg Approach
Aug 29, 2026 20:21 UTC 85/100 ▼
Vessel A: IMO 8230728 (VOLGONEFT 128) RUSSIA
Vessel B: Thoth (THOTH) Russia
  • Minimum Distance: 217 meters
  • Average Distance: 220 meters
  • Duration: 2h 24m
  • Period: 2026-08-29T20:21:32+00:00 to 2026-08-29T22:46:12+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Ust-Luga/St. Petersburg Approach

Confidence Analysis

Score: 85/100

High-confidence STS candidate. Two tankers (VOLGONEFT 128 and THOTH) maintained close proximity (min 217m, avg 220m) for 145 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Ust-Luga/St. Petersburg Approach, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness15/25Min distance 217m, avg 220m
Duration25/25Duration 145 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±3m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Ust-Luga/St. Petersburg Approach

🛰️ Satellite Corroboration

? SAR Inconclusive

Satellite imagery available but requires review

Preview available for manual review

Scene: S1C_IW_GRDH_1SDV_20260829T153916_20260829T153941_009212_0124DD_1FCD_COG • Acquired: 2026-08-29T15:39:16.746796Z • Platform: sentinel-1c
SAR satellite preview for event 1165424

Click image to view full size

Searched: 2026-08-30T02:45:07.371142+00:00

Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273437610,
        "imo": 8230728,
        "name": "VOLGONEFT 128",
        "flag": "RUSSIA"
    },
    "vessel_b": {
        "mmsi": 273253080,
        "imo": 9164718,
        "name": "THOTH",
        "flag": "Russia"
    },
    "min_distance_m": 216.69999999999998863131622783839702606201171875,
    "avg_distance_m": 219.599999999999994315658113919198513031005859375,
    "distance_consistency_m": 3,
    "duration_minutes": 144.69999999999998863131622783839702606201171875,
    "overlap_duration_s": 8680,
    "speed_a_avg": 0,
    "speed_a_std": 0,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0,
            "max_sog": 0
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-08-29T20:21:32+00:00",
        "end": "2026-08-29T22:46:12+00:00"
    },
    "points_count": {
        "vessel_a": 6,
        "vessel_b": 6
    },
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "score": {
        "value": 85,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 217m, avg 220m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 145 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: Ust-Luga\/St. Petersburg Approach"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (VOLGONEFT 128 and THOTH) maintained close proximity (min 217m, avg 220m) for 145 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Ust-Luga\/St. Petersburg Approach, a known STS activity area."
    },
    "sar": {
        "status": "inconclusive",
        "centroid": {
            "lat": 59.88266939999999749488779343664646148681640625,
            "lon": 30.225693199999998483917806879617273807525634765625
        },
        "time_window": {
            "start_ts": "2026-08-29T20:21:32+00:00",
            "end_ts": "2026-08-29T22:46:12+00:00"
        },
        "searched_at": "2026-08-30T02:45:07.371142+00:00",
        "scene_id": "S1C_IW_GRDH_1SDV_20260829T153916_20260829T153941_009212_0124DD_1FCD_COG",
        "scene_datetime": "2026-08-29T15:39:16.746796Z",
        "platform": "sentinel-1c",
        "bbox": {
            "min_lon": 27.491172999999999859710442251525819301605224609375,
            "min_lat": 58.31375899999999745659806649200618267059326171875,
            "max_lon": 32.63072199999999867259248276241123676300048828125,
            "max_lat": 60.23731599999999986039256327785551548004150390625
        },
        "assets": {
            "preview_url": "https:\/\/fleetleaks.com\/wp-content\/uploads\/fleetleaks-evidence\/sar-imagery\/2026\/08\/event_1165424_thumbnail_20260830024512.png",
            "stored_path": "\/home\/fleetleaks\/public_html\/wp-content\/uploads\/fleetleaks-evidence\/sar-imagery\/2026\/08\/event_1165424_thumbnail_20260830024512.png",
            "source": "copernicus_dataspace"
        },
        "notes": "Preview available for manual review"
    }
}
Methodology: 2026.01.18
Zone Dwell Ust-Luga/St. Petersburg Approach
Aug 29, 2026 20:04 UTC 80.0% ▼
  • Zone: Ust-Luga/St. Petersburg Approach
  • Duration: 2h 41m
  • Data Points: 9 AIS positions
  • Period: 2026-08-29T20:04:23+00:00 to 2026-08-29T22:46:12+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 161.80000000000001136868377216160297393798828125,
    "points_in_zone": 9,
    "first_point": {
        "ts": "2026-08-29T20:04:23+00:00",
        "lat": 59.881928299999998444036464206874370574951171875,
        "lon": 30.226910000000000167119651450775563716888427734375
    },
    "last_point": {
        "ts": "2026-08-29T22:46:12+00:00",
        "lat": 59.88186170000000174695742316544055938720703125,
        "lon": 30.226929999999999409965312224812805652618408203125
    }
}
Methodology: 2026.01.18
Sts Ust-Luga/St. Petersburg Approach
Aug 29, 2026 19:22 UTC 85/100 ▼
Vessel A: IMO 8230728 (VOLGONEFT 128) RUSSIA
Vessel B: Thoth (THOTH) Russia
  • Minimum Distance: 217 meters
  • Average Distance: 219 meters
  • Duration: 3h 23m
  • Period: 2026-08-29T19:22:37+00:00 to 2026-08-29T22:46:12+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Ust-Luga/St. Petersburg Approach

Confidence Analysis

Score: 85/100

High-confidence STS candidate. Two tankers (VOLGONEFT 128 and THOTH) maintained close proximity (min 217m, avg 219m) for 204 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Ust-Luga/St. Petersburg Approach, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness15/25Min distance 217m, avg 219m
Duration25/25Duration 204 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±3m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Ust-Luga/St. Petersburg Approach
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273437610,
        "imo": 8230728,
        "name": "VOLGONEFT 128",
        "flag": "RUSSIA"
    },
    "vessel_b": {
        "mmsi": 273253080,
        "imo": 9164718,
        "name": "THOTH",
        "flag": "Russia"
    },
    "min_distance_m": 216.69999999999998863131622783839702606201171875,
    "avg_distance_m": 218.900000000000005684341886080801486968994140625,
    "distance_consistency_m": 2.79999999999999982236431605997495353221893310546875,
    "duration_minutes": 203.599999999999994315658113919198513031005859375,
    "overlap_duration_s": 12215,
    "speed_a_avg": 0,
    "speed_a_std": 0,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0,
            "max_sog": 0
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-08-29T19:22:37+00:00",
        "end": "2026-08-29T22:46:12+00:00"
    },
    "points_count": {
        "vessel_a": 8,
        "vessel_b": 8
    },
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "score": {
        "value": 85,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 217m, avg 219m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 204 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: Ust-Luga\/St. Petersburg Approach"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (VOLGONEFT 128 and THOTH) maintained close proximity (min 217m, avg 219m) for 204 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Ust-Luga\/St. Petersburg Approach, a known STS activity area."
    }
}
Methodology: 2026.01.18
Zone Dwell Ust-Luga/St. Petersburg Approach
Aug 29, 2026 19:22 UTC 80.0% ▼
  • Zone: Ust-Luga/St. Petersburg Approach
  • Duration: 3h 23m
  • Data Points: 11 AIS positions
  • Period: 2026-08-29T19:22:37+00:00 to 2026-08-29T22:46:12+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 203.599999999999994315658113919198513031005859375,
    "points_in_zone": 11,
    "first_point": {
        "ts": "2026-08-29T19:22:37+00:00",
        "lat": 59.881928299999998444036464206874370574951171875,
        "lon": 30.226910000000000167119651450775563716888427734375
    },
    "last_point": {
        "ts": "2026-08-29T22:46:12+00:00",
        "lat": 59.88186170000000174695742316544055938720703125,
        "lon": 30.226929999999999409965312224812805652618408203125
    }
}
Methodology: 2026.01.18
Loiter Ust-Luga/St. Petersburg Approach
Aug 29, 2026 19:22 UTC 75.0% ▼
  • Duration: 3h 23m
  • Radius: 6 meters
  • Data Points: 11 AIS positions
  • Centroid: 59.8819, 30.2269
  • Zone: Ust-Luga/St. Petersburg Approach
Show Raw Evidence JSON
{
    "radius_m": 5.70000000000000017763568394002504646778106689453125,
    "duration_minutes": 203.599999999999994315658113919198513031005859375,
    "points": 11,
    "centroid": {
        "lat": 59.881893163636362942270352505147457122802734375,
        "lon": 30.226868481818176093156580463983118534088134765625
    },
    "bbox": {
        "min_lat": 59.88186170000000174695742316544055938720703125,
        "min_lon": 30.226780000000001535909177619032561779022216796875,
        "max_lat": 59.881928299999998444036464206874370574951171875,
        "max_lon": 30.2269332999999988942363415844738483428955078125
    },
    "zone_id": "russia_ust_luga_approach"
}
Methodology: 2026.01.18
Zone Dwell Ust-Luga/St. Petersburg Approach
Aug 29, 2026 18:37 UTC 80.0% ▼
  • Zone: Ust-Luga/St. Petersburg Approach
  • Duration: 4h 8m
  • Data Points: 12 AIS positions
  • Period: 2026-08-29T18:37:42+00:00 to 2026-08-29T22:46:12+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 248.5,
    "points_in_zone": 12,
    "first_point": {
        "ts": "2026-08-29T18:37:42+00:00",
        "lat": 59.881928299999998444036464206874370574951171875,
        "lon": 30.226910000000000167119651450775563716888427734375
    },
    "last_point": {
        "ts": "2026-08-29T22:46:12+00:00",
        "lat": 59.88186170000000174695742316544055938720703125,
        "lon": 30.226929999999999409965312224812805652618408203125
    }
}
Methodology: 2026.01.18
Loiter Ust-Luga/St. Petersburg Approach
Aug 29, 2026 18:37 UTC 75.0% ▼
  • Duration: 4h 8m
  • Radius: 6 meters
  • Data Points: 12 AIS positions
  • Centroid: 59.8819, 30.2269
  • Zone: Ust-Luga/St. Petersburg Approach
Show Raw Evidence JSON
{
    "radius_m": 6,
    "duration_minutes": 248.5,
    "points": 12,
    "centroid": {
        "lat": 59.88189609166666826922664768062531948089599609375,
        "lon": 30.2268719416666584720587707124650478363037109375
    },
    "bbox": {
        "min_lat": 59.88186170000000174695742316544055938720703125,
        "min_lon": 30.226780000000001535909177619032561779022216796875,
        "max_lat": 59.881928299999998444036464206874370574951171875,
        "max_lon": 30.2269332999999988942363415844738483428955078125
    },
    "zone_id": "russia_ust_luga_approach"
}
Methodology: 2026.01.18
Zone Dwell Ust-Luga/St. Petersburg Approach
Aug 29, 2026 16:45 UTC 80.0% ▼
  • Zone: Ust-Luga/St. Petersburg Approach
  • Duration: 6 hours
  • Data Points: 13 AIS positions
  • Period: 2026-08-29T16:45:55+00:00 to 2026-08-29T22:46:12+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 360.30000000000001136868377216160297393798828125,
    "points_in_zone": 13,
    "first_point": {
        "ts": "2026-08-29T16:45:55+00:00",
        "lat": 59.881928299999998444036464206874370574951171875,
        "lon": 30.226910000000000167119651450775563716888427734375
    },
    "last_point": {
        "ts": "2026-08-29T22:46:12+00:00",
        "lat": 59.88186170000000174695742316544055938720703125,
        "lon": 30.226929999999999409965312224812805652618408203125
    }
}
Methodology: 2026.01.18
Loiter Ust-Luga/St. Petersburg Approach
Aug 29, 2026 16:45 UTC 75.0% ▼
  • Duration: 6 hours
  • Radius: 6 meters
  • Data Points: 13 AIS positions
  • Centroid: 59.8819, 30.2269
  • Zone: Ust-Luga/St. Petersburg Approach
Show Raw Evidence JSON
{
    "radius_m": 6.29999999999999982236431605997495353221893310546875,
    "duration_minutes": 360.30000000000001136868377216160297393798828125,
    "points": 13,
    "centroid": {
        "lat": 59.881898569230770590365864336490631103515625,
        "lon": 30.22687486923076249922814895398914813995361328125
    },
    "bbox": {
        "min_lat": 59.88186170000000174695742316544055938720703125,
        "min_lon": 30.226780000000001535909177619032561779022216796875,
        "max_lat": 59.881928299999998444036464206874370574951171875,
        "max_lon": 30.2269332999999988942363415844738483428955078125
    },
    "zone_id": "russia_ust_luga_approach"
}
Methodology: 2026.01.18
Zone Dwell Ust-Luga/St. Petersburg Approach
Aug 29, 2026 14:53 UTC 80.0% ▼
  • Zone: Ust-Luga/St. Petersburg Approach
  • Duration: 6h 19m
  • Data Points: 11 AIS positions
  • Period: 2026-08-29T14:53:20+00:00 to 2026-08-29T21:13:12+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 379.8999999999999772626324556767940521240234375,
    "points_in_zone": 11,
    "first_point": {
        "ts": "2026-08-29T14:53:20+00:00",
        "lat": 59.881928299999998444036464206874370574951171875,
        "lon": 30.226910000000000167119651450775563716888427734375
    },
    "last_point": {
        "ts": "2026-08-29T21:13:12+00:00",
        "lat": 59.88186830000000071549948188476264476776123046875,
        "lon": 30.226780000000001535909177619032561779022216796875
    }
}
Methodology: 2026.01.18
Loiter Ust-Luga/St. Petersburg Approach
Aug 29, 2026 14:53 UTC 75.0% ▼
  • Duration: 6h 19m
  • Radius: 6 meters
  • Data Points: 11 AIS positions
  • Centroid: 59.8819, 30.2269
  • Zone: Ust-Luga/St. Petersburg Approach
Show Raw Evidence JSON
{
    "radius_m": 6.29999999999999982236431605997495353221893310546875,
    "duration_minutes": 379.8999999999999772626324556767940521240234375,
    "points": 11,
    "centroid": {
        "lat": 59.88190648181818431794454227201640605926513671875,
        "lon": 30.226862727272727937588570057414472103118896484375
    },
    "bbox": {
        "min_lat": 59.88186830000000071549948188476264476776123046875,
        "min_lon": 30.226780000000001535909177619032561779022216796875,
        "max_lat": 59.881928299999998444036464206874370574951171875,
        "max_lon": 30.226910000000000167119651450775563716888427734375
    },
    "zone_id": "russia_ust_luga_approach"
}
Methodology: 2026.01.18
Zone Dwell Ust-Luga/St. Petersburg Approach
Aug 29, 2026 13:00 UTC 80.0% ▼
  • Zone: Ust-Luga/St. Petersburg Approach
  • Duration: 6h 35m
  • Data Points: 7 AIS positions
  • Period: 2026-08-29T13:00:53+00:00 to 2026-08-29T19:35:55+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 395,
    "points_in_zone": 7,
    "first_point": {
        "ts": "2026-08-29T13:00:53+00:00",
        "lat": 59.8818533000000030597220757044851779937744140625,
        "lon": 30.2268100000000004001776687800884246826171875
    },
    "last_point": {
        "ts": "2026-08-29T19:35:55+00:00",
        "lat": 59.881928299999998444036464206874370574951171875,
        "lon": 30.226910000000000167119651450775563716888427734375
    }
}
Methodology: 2026.01.18
Zone Dwell Ust-Luga/St. Petersburg Approach
Aug 29, 2026 11:33 UTC 80.0% ▼
  • Zone: Ust-Luga/St. Petersburg Approach
  • Duration: 5h 12m
  • Data Points: 6 AIS positions
  • Period: 2026-08-29T11:33:57+00:00 to 2026-08-29T16:45:55+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 312,
    "points_in_zone": 6,
    "first_point": {
        "ts": "2026-08-29T11:33:57+00:00",
        "lat": 59.8818533000000030597220757044851779937744140625,
        "lon": 30.2268100000000004001776687800884246826171875
    },
    "last_point": {
        "ts": "2026-08-29T16:45:55+00:00",
        "lat": 59.881928299999998444036464206874370574951171875,
        "lon": 30.226910000000000167119651450775563716888427734375
    }
}
Methodology: 2026.01.18
Zone Dwell Ust-Luga/St. Petersburg Approach
Aug 29, 2026 10:15 UTC 80.0% ▼
  • Zone: Ust-Luga/St. Petersburg Approach
  • Duration: 6h 30m
  • Data Points: 10 AIS positions
  • Period: 2026-08-29T10:15:11+00:00 to 2026-08-29T16:45:55+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 390.69999999999998863131622783839702606201171875,
    "points_in_zone": 10,
    "first_point": {
        "ts": "2026-08-29T10:15:11+00:00",
        "lat": 59.8818533000000030597220757044851779937744140625,
        "lon": 30.2268100000000004001776687800884246826171875
    },
    "last_point": {
        "ts": "2026-08-29T16:45:55+00:00",
        "lat": 59.881928299999998444036464206874370574951171875,
        "lon": 30.226910000000000167119651450775563716888427734375
    }
}
Methodology: 2026.01.18
Loiter Ust-Luga/St. Petersburg Approach
Aug 29, 2026 10:15 UTC 75.0% ▼
  • Duration: 6h 30m
  • Radius: 7 meters
  • Data Points: 10 AIS positions
  • Centroid: 59.8819, 30.2268
  • Zone: Ust-Luga/St. Petersburg Approach
Show Raw Evidence JSON
{
    "radius_m": 7,
    "duration_minutes": 390.69999999999998863131622783839702606201171875,
    "points": 10,
    "centroid": {
        "lat": 59.8818758000000030961018637754023075103759765625,
        "lon": 30.226839999999999264446159941144287586212158203125
    },
    "bbox": {
        "min_lat": 59.8818533000000030597220757044851779937744140625,
        "min_lon": 30.2268100000000004001776687800884246826171875,
        "max_lat": 59.881928299999998444036464206874370574951171875,
        "max_lon": 30.226910000000000167119651450775563716888427734375
    },
    "zone_id": "russia_ust_luga_approach"
}
Methodology: 2026.01.18
Zone Dwell Ust-Luga/St. Petersburg Approach
Aug 29, 2026 09:12 UTC 80.0% ▼
  • Zone: Ust-Luga/St. Petersburg Approach
  • Duration: 5h 40m
  • Data Points: 13 AIS positions
  • Period: 2026-08-29T09:12:53+00:00 to 2026-08-29T14:53:20+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 340.3999999999999772626324556767940521240234375,
    "points_in_zone": 13,
    "first_point": {
        "ts": "2026-08-29T09:12:53+00:00",
        "lat": 59.8818533000000030597220757044851779937744140625,
        "lon": 30.2268100000000004001776687800884246826171875
    },
    "last_point": {
        "ts": "2026-08-29T14:53:20+00:00",
        "lat": 59.881928299999998444036464206874370574951171875,
        "lon": 30.226910000000000167119651450775563716888427734375
    }
}
Methodology: 2026.01.18
Loiter Ust-Luga/St. Petersburg Approach
Aug 29, 2026 09:12 UTC 75.0% ▼
  • Duration: 5h 40m
  • Radius: 9 meters
  • Data Points: 13 AIS positions
  • Centroid: 59.8819, 30.2268
  • Zone: Ust-Luga/St. Petersburg Approach
Show Raw Evidence JSON
{
    "radius_m": 8.5,
    "duration_minutes": 340.3999999999999772626324556767940521240234375,
    "points": 13,
    "centroid": {
        "lat": 59.8818648384615386248697177506983280181884765625,
        "lon": 30.2268253846153811537078581750392913818359375
    },
    "bbox": {
        "min_lat": 59.8818533000000030597220757044851779937744140625,
        "min_lon": 30.2268100000000004001776687800884246826171875,
        "max_lat": 59.881928299999998444036464206874370574951171875,
        "max_lon": 30.226910000000000167119651450775563716888427734375
    },
    "zone_id": "russia_ust_luga_approach"
}
Methodology: 2026.01.18
Zone Dwell Ust-Luga/St. Petersburg Approach
Aug 29, 2026 08:22 UTC 80.0% ▼
  • Zone: Ust-Luga/St. Petersburg Approach
  • Duration: 6h 31m
  • Data Points: 17 AIS positions
  • Period: 2026-08-29T08:22:15+00:00 to 2026-08-29T14:53:20+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 391.1000000000000227373675443232059478759765625,
    "points_in_zone": 17,
    "first_point": {
        "ts": "2026-08-29T08:22:15+00:00",
        "lat": 59.8818950000000000954969436861574649810791015625,
        "lon": 30.226948300000000102727426565252244472503662109375
    },
    "last_point": {
        "ts": "2026-08-29T14:53:20+00:00",
        "lat": 59.881928299999998444036464206874370574951171875,
        "lon": 30.226910000000000167119651450775563716888427734375
    }
}
Methodology: 2026.01.18
Loiter Ust-Luga/St. Petersburg Approach
Aug 29, 2026 08:22 UTC 75.0% ▼
  • Duration: 6h 31m
  • Radius: 8 meters
  • Data Points: 17 AIS positions
  • Centroid: 59.8819, 30.2268
  • Zone: Ust-Luga/St. Petersburg Approach
Show Raw Evidence JSON
{
    "radius_m": 7.9000000000000003552713678800500929355621337890625,
    "duration_minutes": 391.1000000000000227373675443232059478759765625,
    "points": 17,
    "centroid": {
        "lat": 59.8818670294117652019849629141390323638916015625,
        "lon": 30.22683803529411505905954982154071331024169921875
    },
    "bbox": {
        "min_lat": 59.8818533000000030597220757044851779937744140625,
        "min_lon": 30.2268100000000004001776687800884246826171875,
        "max_lat": 59.881928299999998444036464206874370574951171875,
        "max_lon": 30.226948300000000102727426565252244472503662109375
    },
    "zone_id": "russia_ust_luga_approach"
}
Methodology: 2026.01.18
Zone Dwell Ust-Luga/St. Petersburg Approach
Aug 29, 2026 07:49 UTC 80.0% ▼
  • Zone: Ust-Luga/St. Petersburg Approach
  • Duration: 5h 39m
  • Data Points: 17 AIS positions
  • Period: 2026-08-29T07:49:12+00:00 to 2026-08-29T13:28:18+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 339.1000000000000227373675443232059478759765625,
    "points_in_zone": 17,
    "first_point": {
        "ts": "2026-08-29T07:49:12+00:00",
        "lat": 59.8818950000000000954969436861574649810791015625,
        "lon": 30.226948300000000102727426565252244472503662109375
    },
    "last_point": {
        "ts": "2026-08-29T13:28:18+00:00",
        "lat": 59.881928299999998444036464206874370574951171875,
        "lon": 30.226910000000000167119651450775563716888427734375
    }
}
Methodology: 2026.01.18
Loiter Ust-Luga/St. Petersburg Approach
Aug 29, 2026 07:49 UTC 75.0% ▼
  • Duration: 5h 39m
  • Radius: 8 meters
  • Data Points: 17 AIS positions
  • Centroid: 59.8819, 30.2268
  • Zone: Ust-Luga/St. Petersburg Approach
Show Raw Evidence JSON
{
    "radius_m": 8.0999999999999996447286321199499070644378662109375,
    "duration_minutes": 339.1000000000000227373675443232059478759765625,
    "points": 17,
    "centroid": {
        "lat": 59.8818650705882333795671002008020877838134765625,
        "lon": 30.2268402882352944516242132522165775299072265625
    },
    "bbox": {
        "min_lat": 59.8818533000000030597220757044851779937744140625,
        "min_lon": 30.2268100000000004001776687800884246826171875,
        "max_lat": 59.881928299999998444036464206874370574951171875,
        "max_lon": 30.226948300000000102727426565252244472503662109375
    },
    "zone_id": "russia_ust_luga_approach"
}
Methodology: 2026.01.18
Zone Dwell Ust-Luga/St. Petersburg Approach
Aug 29, 2026 05:17 UTC 80.0% ▼
  • Zone: Ust-Luga/St. Petersburg Approach
  • Duration: 6h 16m
  • Data Points: 15 AIS positions
  • Period: 2026-08-29T05:17:27+00:00 to 2026-08-29T11:33:57+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 376.5,
    "points_in_zone": 15,
    "first_point": {
        "ts": "2026-08-29T05:17:27+00:00",
        "lat": 59.88197000000000258523868978954851627349853515625,
        "lon": 30.2270682999999991125150700099766254425048828125
    },
    "last_point": {
        "ts": "2026-08-29T11:33:57+00:00",
        "lat": 59.8818533000000030597220757044851779937744140625,
        "lon": 30.2268100000000004001776687800884246826171875
    }
}
Methodology: 2026.01.18
Loiter Ust-Luga/St. Petersburg Approach
Aug 29, 2026 05:17 UTC 75.0% ▼
  • Duration: 6h 16m
  • Radius: 16 meters
  • Data Points: 15 AIS positions
  • Centroid: 59.8819, 30.2269
  • Zone: Ust-Luga/St. Petersburg Approach
Show Raw Evidence JSON
{
    "radius_m": 16.39999999999999857891452847979962825775146484375,
    "duration_minutes": 376.5,
    "points": 15,
    "centroid": {
        "lat": 59.88186941999999390873199445195496082305908203125,
        "lon": 30.226854880000001202233761432580649852752685546875
    },
    "bbox": {
        "min_lat": 59.8818533000000030597220757044851779937744140625,
        "min_lon": 30.2268100000000004001776687800884246826171875,
        "max_lat": 59.88197000000000258523868978954851627349853515625,
        "max_lon": 30.2270682999999991125150700099766254425048828125
    },
    "zone_id": "russia_ust_luga_approach"
}
Methodology: 2026.01.18
Zone Dwell Ust-Luga/St. Petersburg Approach
Aug 29, 2026 04:32 UTC 80.0% ▼
  • Zone: Ust-Luga/St. Petersburg Approach
  • Duration: 6h 27m
  • Data Points: 16 AIS positions
  • Period: 2026-08-29T04:32:17+00:00 to 2026-08-29T11:00:00+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 387.69999999999998863131622783839702606201171875,
    "points_in_zone": 16,
    "first_point": {
        "ts": "2026-08-29T04:32:17+00:00",
        "lat": 59.88197000000000258523868978954851627349853515625,
        "lon": 30.2270682999999991125150700099766254425048828125
    },
    "last_point": {
        "ts": "2026-08-29T11:00:00+00:00",
        "lat": 59.8818533000000030597220757044851779937744140625,
        "lon": 30.2268100000000004001776687800884246826171875
    }
}
Methodology: 2026.01.18
Loiter Ust-Luga/St. Petersburg Approach
Aug 29, 2026 04:32 UTC 75.0% ▼
  • Duration: 6h 27m
  • Radius: 14 meters
  • Data Points: 16 AIS positions
  • Centroid: 59.8819, 30.2269
  • Zone: Ust-Luga/St. Petersburg Approach
Show Raw Evidence JSON
{
    "radius_m": 14.0999999999999996447286321199499070644378662109375,
    "duration_minutes": 387.69999999999998863131622783839702606201171875,
    "points": 16,
    "centroid": {
        "lat": 59.88188299999999486544766114093363285064697265625,
        "lon": 30.2268843625000016572812455706298351287841796875
    },
    "bbox": {
        "min_lat": 59.8818533000000030597220757044851779937744140625,
        "min_lon": 30.2268100000000004001776687800884246826171875,
        "max_lat": 59.88197000000000258523868978954851627349853515625,
        "max_lon": 30.2270682999999991125150700099766254425048828125
    },
    "zone_id": "russia_ust_luga_approach"
}
Methodology: 2026.01.18
Zone Dwell Ust-Luga/St. Petersburg Approach
Aug 29, 2026 03:12 UTC 80.0% ▼
  • Zone: Ust-Luga/St. Petersburg Approach
  • Duration: 6h 21m
  • Data Points: 12 AIS positions
  • Period: 2026-08-29T03:12:23+00:00 to 2026-08-29T09:34:09+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 381.80000000000001136868377216160297393798828125,
    "points_in_zone": 12,
    "first_point": {
        "ts": "2026-08-29T03:12:23+00:00",
        "lat": 59.88184170000000250411176239140331745147705078125,
        "lon": 30.2269782999999989669959177263081073760986328125
    },
    "last_point": {
        "ts": "2026-08-29T09:34:09+00:00",
        "lat": 59.8818533000000030597220757044851779937744140625,
        "lon": 30.2268100000000004001776687800884246826171875
    }
}
Methodology: 2026.01.18
Loiter Ust-Luga/St. Petersburg Approach
Aug 29, 2026 03:12 UTC 75.0% ▼
  • Duration: 6h 21m
  • Radius: 12 meters
  • Data Points: 12 AIS positions
  • Centroid: 59.8819, 30.2269
  • Zone: Ust-Luga/St. Petersburg Approach
Show Raw Evidence JSON
{
    "radius_m": 11.9000000000000003552713678800500929355621337890625,
    "duration_minutes": 381.80000000000001136868377216160297393798828125,
    "points": 12,
    "centroid": {
        "lat": 59.88189193333332838165006251074373722076416015625,
        "lon": 30.226923174999999588408172712661325931549072265625
    },
    "bbox": {
        "min_lat": 59.88184170000000250411176239140331745147705078125,
        "min_lon": 30.2268100000000004001776687800884246826171875,
        "max_lat": 59.88197000000000258523868978954851627349853515625,
        "max_lon": 30.2270682999999991125150700099766254425048828125
    },
    "zone_id": "russia_ust_luga_approach"
}
Methodology: 2026.01.18
Zone Dwell Ust-Luga/St. Petersburg Approach
Aug 29, 2026 02:17 UTC 80.0% ▼
  • Zone: Ust-Luga/St. Petersburg Approach
  • Duration: 6h 28m
  • Data Points: 11 AIS positions
  • Period: 2026-08-29T02:17:11+00:00 to 2026-08-29T08:45:21+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 388.19999999999998863131622783839702606201171875,
    "points_in_zone": 11,
    "first_point": {
        "ts": "2026-08-29T02:17:11+00:00",
        "lat": 59.88184170000000250411176239140331745147705078125,
        "lon": 30.2269782999999989669959177263081073760986328125
    },
    "last_point": {
        "ts": "2026-08-29T08:45:21+00:00",
        "lat": 59.8818533000000030597220757044851779937744140625,
        "lon": 30.2268100000000004001776687800884246826171875
    }
}
Methodology: 2026.01.18
Loiter Ust-Luga/St. Petersburg Approach
Aug 29, 2026 02:17 UTC 75.0% ▼
  • Duration: 6h 28m
  • Radius: 10 meters
  • Data Points: 11 AIS positions
  • Centroid: 59.8819, 30.2270
  • Zone: Ust-Luga/St. Petersburg Approach
Show Raw Evidence JSON
{
    "radius_m": 10.300000000000000710542735760100185871124267578125,
    "duration_minutes": 388.19999999999998863131622783839702606201171875,
    "points": 11,
    "centroid": {
        "lat": 59.88189333636363897994669969193637371063232421875,
        "lon": 30.226964063636362567422111169435083866119384765625
    },
    "bbox": {
        "min_lat": 59.88184170000000250411176239140331745147705078125,
        "min_lon": 30.2268100000000004001776687800884246826171875,
        "max_lat": 59.88197000000000258523868978954851627349853515625,
        "max_lon": 30.2270682999999991125150700099766254425048828125
    },
    "zone_id": "russia_ust_luga_approach"
}
Methodology: 2026.01.18
Zone Dwell Ust-Luga/St. Petersburg Approach
Aug 29, 2026 00:04 UTC 80.0% ▼
  • Zone: Ust-Luga/St. Petersburg Approach
  • Duration: 5h 12m
  • Data Points: 7 AIS positions
  • Period: 2026-08-29T00:04:33+00:00 to 2026-08-29T05:17:27+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 312.8999999999999772626324556767940521240234375,
    "points_in_zone": 7,
    "first_point": {
        "ts": "2026-08-29T00:04:33+00:00",
        "lat": 59.8818083000000029869624995626509189605712890625,
        "lon": 30.226863300000001544276528875343501567840576171875
    },
    "last_point": {
        "ts": "2026-08-29T05:17:27+00:00",
        "lat": 59.88197000000000258523868978954851627349853515625,
        "lon": 30.2270682999999991125150700099766254425048828125
    }
}
Methodology: 2026.01.18
Zone Dwell Ust-Luga/St. Petersburg Approach
Aug 28, 2026 23:01 UTC 80.0% ▼
  • Zone: Ust-Luga/St. Petersburg Approach
  • Duration: 6h 15m
  • Data Points: 9 AIS positions
  • Period: 2026-08-28T23:01:54+00:00 to 2026-08-29T05:17:27+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 375.6000000000000227373675443232059478759765625,
    "points_in_zone": 9,
    "first_point": {
        "ts": "2026-08-28T23:01:54+00:00",
        "lat": 59.88184170000000250411176239140331745147705078125,
        "lon": 30.226893300000000408545020036399364471435546875
    },
    "last_point": {
        "ts": "2026-08-29T05:17:27+00:00",
        "lat": 59.88197000000000258523868978954851627349853515625,
        "lon": 30.2270682999999991125150700099766254425048828125
    }
}
Methodology: 2026.01.18
Zone Dwell Ust-Luga/St. Petersburg Approach
Aug 28, 2026 22:08 UTC 80.0% ▼
  • Zone: Ust-Luga/St. Petersburg Approach
  • Duration: 6h 18m
  • Data Points: 10 AIS positions
  • Period: 2026-08-28T22:59:12+00:00 to 2026-08-29T05:17:27+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 378.19999999999998863131622783839702606201171875,
    "points_in_zone": 10,
    "first_point": {
        "ts": "2026-08-28T22:59:12+00:00",
        "lat": 59.88184170000000250411176239140331745147705078125,
        "lon": 30.226893300000000408545020036399364471435546875
    },
    "last_point": {
        "ts": "2026-08-29T05:17:27+00:00",
        "lat": 59.88197000000000258523868978954851627349853515625,
        "lon": 30.2270682999999991125150700099766254425048828125
    }
}
Methodology: 2026.01.18
Loiter Ust-Luga/St. Petersburg Approach
Aug 28, 2026 22:08 UTC 75.0% ▼
  • Duration: 6h 18m
  • Radius: 12 meters
  • Data Points: 10 AIS positions
  • Centroid: 59.8819, 30.2270
  • Zone: Ust-Luga/St. Petersburg Approach
Show Raw Evidence JSON
{
    "radius_m": 12.199999999999999289457264239899814128875732421875,
    "duration_minutes": 378.19999999999998863131622783839702606201171875,
    "points": 10,
    "centroid": {
        "lat": 59.8818735100000054671909310854971408843994140625,
        "lon": 30.22696529999999626170392730273306369781494140625
    },
    "bbox": {
        "min_lat": 59.8818083000000029869624995626509189605712890625,
        "min_lon": 30.226863300000001544276528875343501567840576171875,
        "max_lat": 59.88197000000000258523868978954851627349853515625,
        "max_lon": 30.2270682999999991125150700099766254425048828125
    },
    "zone_id": "russia_ust_luga_approach"
}
Methodology: 2026.01.18
Zone Dwell Ust-Luga/St. Petersburg Approach
Aug 28, 2026 21:05 UTC 80.0% ▼
  • Zone: Ust-Luga/St. Petersburg Approach
  • Duration: 6h 6m
  • Data Points: 13 AIS positions
  • Period: 2026-08-28T21:05:49+00:00 to 2026-08-29T03:12:23+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 366.6000000000000227373675443232059478759765625,
    "points_in_zone": 13,
    "first_point": {
        "ts": "2026-08-28T21:05:49+00:00",
        "lat": 59.8818882999999999583451426587998867034912109375,
        "lon": 30.226891699999999474357537110336124897003173828125
    },
    "last_point": {
        "ts": "2026-08-29T03:12:23+00:00",
        "lat": 59.88184170000000250411176239140331745147705078125,
        "lon": 30.2269782999999989669959177263081073760986328125
    }
}
Methodology: 2026.01.18
Loiter Ust-Luga/St. Petersburg Approach
Aug 28, 2026 21:05 UTC 75.0% ▼
  • Duration: 6h 6m
  • Radius: 12 meters
  • Data Points: 13 AIS positions
  • Centroid: 59.8819, 30.2269
  • Zone: Ust-Luga/St. Petersburg Approach
Show Raw Evidence JSON
{
    "radius_m": 12,
    "duration_minutes": 366.6000000000000227373675443232059478759765625,
    "points": 13,
    "centroid": {
        "lat": 59.881861661538465568810352124273777008056640625,
        "lon": 30.2268957615384579185047186911106109619140625
    },
    "bbox": {
        "min_lat": 59.8818083000000029869624995626509189605712890625,
        "min_lon": 30.22673830000000094742063083685934543609619140625,
        "max_lat": 59.8819349999999985811882652342319488525390625,
        "max_lon": 30.2269782999999989669959177263081073760986328125
    },
    "zone_id": "russia_ust_luga_approach"
}
Methodology: 2026.01.18
Zone Dwell Ust-Luga/St. Petersburg Approach
Aug 28, 2026 19:18 UTC 80.0% ▼
  • Zone: Ust-Luga/St. Petersburg Approach
  • Duration: 4h 45m
  • Data Points: 11 AIS positions
  • Period: 2026-08-28T19:18:49+00:00 to 2026-08-29T00:04:33+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 285.69999999999998863131622783839702606201171875,
    "points_in_zone": 11,
    "first_point": {
        "ts": "2026-08-28T19:18:49+00:00",
        "lat": 59.88191669999999788842615089379251003265380859375,
        "lon": 30.22687499999999971578290569595992565155029296875
    },
    "last_point": {
        "ts": "2026-08-29T00:04:33+00:00",
        "lat": 59.8818083000000029869624995626509189605712890625,
        "lon": 30.226863300000001544276528875343501567840576171875
    }
}
Methodology: 2026.01.18
Loiter Ust-Luga/St. Petersburg Approach
Aug 28, 2026 19:18 UTC 75.0% ▼
  • Duration: 4h 45m
  • Radius: 10 meters
  • Data Points: 11 AIS positions
  • Centroid: 59.8819, 30.2269
  • Zone: Ust-Luga/St. Petersburg Approach
Show Raw Evidence JSON
{
    "radius_m": 10.199999999999999289457264239899814128875732421875,
    "duration_minutes": 285.69999999999998863131622783839702606201171875,
    "points": 11,
    "centroid": {
        "lat": 59.88187210909091362509570899419486522674560546875,
        "lon": 30.2268713636363628438630257733166217803955078125
    },
    "bbox": {
        "min_lat": 59.8818083000000029869624995626509189605712890625,
        "min_lon": 30.22673830000000094742063083685934543609619140625,
        "max_lat": 59.8819349999999985811882652342319488525390625,
        "max_lon": 30.226893300000000408545020036399364471435546875
    },
    "zone_id": "russia_ust_luga_approach"
}
Methodology: 2026.01.18
Sts🛰️? Ust-Luga/St. Petersburg Approach
Aug 28, 2026 18:33 UTC 85/100 ▼
Vessel A: IMO 8230728 (VOLGONEFT 128) RUSSIA
Vessel B: Solstraum (SOLSTRAUM) Russia
  • Minimum Distance: 235 meters
  • Average Distance: 242 meters
  • Duration: 3h 34m
  • Period: 2026-08-28T18:33:41+00:00 to 2026-08-28T22:08:14+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.2 knots
  • Zone: Ust-Luga/St. Petersburg Approach

Confidence Analysis

Score: 85/100

High-confidence STS candidate. Two tankers (VOLGONEFT 128 and SOLSTRAUM) maintained close proximity (min 234m, avg 242m) for 215 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.2 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Ust-Luga/St. Petersburg Approach, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness15/25Min distance 234m, avg 242m
Duration25/25Duration 215 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±6m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Ust-Luga/St. Petersburg Approach

🛰️ Satellite Corroboration

? SAR Inconclusive

Satellite imagery available but requires review

Preview available for manual review

Scene: S1D_IW_GRDH_1SDV_20260828T154755_20260828T154820_004328_007FB7_E241_COG • Acquired: 2026-08-28T15:47:55.906188Z • Platform: sentinel-1d
SAR satellite preview for event 1159464

Click image to view full size

Searched: 2026-08-29T01:15:04.931122+00:00

Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273437610,
        "imo": 8230728,
        "name": "VOLGONEFT 128",
        "flag": "RUSSIA"
    },
    "vessel_b": {
        "mmsi": 273291710,
        "imo": 9157014,
        "name": "SOLSTRAUM",
        "flag": "Russia"
    },
    "min_distance_m": 234.5,
    "avg_distance_m": 241.5,
    "distance_consistency_m": 6.5,
    "duration_minutes": 214.599999999999994315658113919198513031005859375,
    "overlap_duration_s": 12873,
    "speed_a_avg": 0,
    "speed_a_std": 0,
    "speed_b_avg": 0.1700000000000000122124532708767219446599483489990234375,
    "speed_b_std": 0.2099999999999999922284388276239042170345783233642578125,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0,
            "max_sog": 0
        },
        "vessel_b": {
            "avg_sog": 0.1700000000000000122124532708767219446599483489990234375,
            "max_sog": 0.40000000000000002220446049250313080847263336181640625
        }
    },
    "time_window": {
        "start": "2026-08-28T18:33:41+00:00",
        "end": "2026-08-28T22:08:14+00:00"
    },
    "points_count": {
        "vessel_a": 3,
        "vessel_b": 3
    },
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "score": {
        "value": 85,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 234m, avg 242m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 215 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: Ust-Luga\/St. Petersburg Approach"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (VOLGONEFT 128 and SOLSTRAUM) maintained close proximity (min 234m, avg 242m) for 215 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.2 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Ust-Luga\/St. Petersburg Approach, a known STS activity area."
    },
    "sar": {
        "status": "inconclusive",
        "centroid": {
            "lat": 59.882869999999996935002855025231838226318359375,
            "lon": 30.22607310000000069294401328079402446746826171875
        },
        "time_window": {
            "start_ts": "2026-08-28T18:33:41+00:00",
            "end_ts": "2026-08-28T22:08:14+00:00"
        },
        "searched_at": "2026-08-29T01:15:04.931122+00:00",
        "scene_id": "S1D_IW_GRDH_1SDV_20260828T154755_20260828T154820_004328_007FB7_E241_COG",
        "scene_datetime": "2026-08-28T15:47:55.906188Z",
        "platform": "sentinel-1d",
        "bbox": {
            "min_lon": 25.077256999999999464989741682074964046478271484375,
            "min_lat": 59.0521049999999974033926264382898807525634765625,
            "max_lon": 30.358602999999998672819856437854468822479248046875,
            "max_lat": 60.98131599999999963301888783462345600128173828125
        },
        "assets": {
            "preview_url": "https:\/\/fleetleaks.com\/wp-content\/uploads\/fleetleaks-evidence\/sar-imagery\/2026\/08\/event_1159464_thumbnail_20260829011511.png",
            "stored_path": "\/home\/fleetleaks\/public_html\/wp-content\/uploads\/fleetleaks-evidence\/sar-imagery\/2026\/08\/event_1159464_thumbnail_20260829011511.png",
            "source": "copernicus_dataspace"
        },
        "notes": "Preview available for manual review"
    }
}
Methodology: 2026.01.18
Zone Dwell Ust-Luga/St. Petersburg Approach
Aug 28, 2026 18:17 UTC 80.0% ▼
  • Zone: Ust-Luga/St. Petersburg Approach
  • Duration: 5h 46m
  • Data Points: 14 AIS positions
  • Period: 2026-08-28T18:17:42+00:00 to 2026-08-29T00:04:33+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 346.8999999999999772626324556767940521240234375,
    "points_in_zone": 14,
    "first_point": {
        "ts": "2026-08-28T18:17:42+00:00",
        "lat": 59.88182830000000222980816033668816089630126953125,
        "lon": 30.226904999999998580051396857015788555145263671875
    },
    "last_point": {
        "ts": "2026-08-29T00:04:33+00:00",
        "lat": 59.8818083000000029869624995626509189605712890625,
        "lon": 30.226863300000001544276528875343501567840576171875
    }
}
Methodology: 2026.01.18
Loiter Ust-Luga/St. Petersburg Approach
Aug 28, 2026 18:17 UTC 75.0% ▼
  • Duration: 5h 46m
  • Radius: 11 meters
  • Data Points: 14 AIS positions
  • Centroid: 59.8819, 30.2269
  • Zone: Ust-Luga/St. Petersburg Approach
Show Raw Evidence JSON
{
    "radius_m": 11.199999999999999289457264239899814128875732421875,
    "duration_minutes": 346.8999999999999772626324556767940521240234375,
    "points": 14,
    "centroid": {
        "lat": 59.88186272142856836353530525229871273040771484375,
        "lon": 30.22687857142857836834082263521850109100341796875
    },
    "bbox": {
        "min_lat": 59.8818083000000029869624995626509189605712890625,
        "min_lon": 30.22673830000000094742063083685934543609619140625,
        "max_lat": 59.8819349999999985811882652342319488525390625,
        "max_lon": 30.226904999999998580051396857015788555145263671875
    },
    "zone_id": "russia_ust_luga_approach"
}
Methodology: 2026.01.18
Sts Ust-Luga/St. Petersburg Approach
Aug 28, 2026 17:24 UTC 85/100 ▼
Vessel A: IMO 8230728 (VOLGONEFT 128) RUSSIA
Vessel B: Solstraum (SOLSTRAUM) Russia
  • Minimum Distance: 242 meters
  • Average Distance: 246 meters
  • Duration: 3h 41m
  • Period: 2026-08-28T17:24:37+00:00 to 2026-08-28T21:05:49+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.1 knots
  • Zone: Ust-Luga/St. Petersburg Approach

Confidence Analysis

Score: 85/100

High-confidence STS candidate. Two tankers (VOLGONEFT 128 and SOLSTRAUM) maintained close proximity (min 242m, avg 246m) for 221 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 Ust-Luga/St. Petersburg Approach, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness15/25Min distance 242m, avg 246m
Duration25/25Duration 221 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±3m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Ust-Luga/St. Petersburg Approach
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273437610,
        "imo": 8230728,
        "name": "VOLGONEFT 128",
        "flag": "RUSSIA"
    },
    "vessel_b": {
        "mmsi": 273291710,
        "imo": 9157014,
        "name": "SOLSTRAUM",
        "flag": "Russia"
    },
    "min_distance_m": 242.19999999999998863131622783839702606201171875,
    "avg_distance_m": 246.19999999999998863131622783839702606201171875,
    "distance_consistency_m": 3,
    "duration_minutes": 221.19999999999998863131622783839702606201171875,
    "overlap_duration_s": 13272,
    "speed_a_avg": 0,
    "speed_a_std": 0,
    "speed_b_avg": 0.14000000000000001332267629550187848508358001708984375,
    "speed_b_std": 0.179999999999999993338661852249060757458209991455078125,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0,
            "max_sog": 0
        },
        "vessel_b": {
            "avg_sog": 0.14000000000000001332267629550187848508358001708984375,
            "max_sog": 0.40000000000000002220446049250313080847263336181640625
        }
    },
    "time_window": {
        "start": "2026-08-28T17:24:37+00:00",
        "end": "2026-08-28T21:05:49+00:00"
    },
    "points_count": {
        "vessel_a": 7,
        "vessel_b": 7
    },
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "score": {
        "value": 85,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 242m, avg 246m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 221 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: Ust-Luga\/St. Petersburg Approach"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (VOLGONEFT 128 and SOLSTRAUM) maintained close proximity (min 242m, avg 246m) for 221 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 Ust-Luga\/St. Petersburg Approach, a known STS activity area."
    }
}
Methodology: 2026.01.18
Sts🛰️? Ust-Luga/St. Petersburg Approach
Aug 28, 2026 17:24 UTC 80/100 ▼
Vessel A: IMO 8230728 (VOLGONEFT 128) RUSSIA
Vessel B: IMO 6920147 (ARCTICA) Russia
  • Minimum Distance: 80 meters
  • Average Distance: 86 meters
  • Duration: 53 minutes
  • Period: 2026-08-28T17:24:37+00:00 to 2026-08-28T18:17:42+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Ust-Luga/St. Petersburg Approach

Confidence Analysis

Score: 80/100

High-confidence STS candidate. Two tankers (VOLGONEFT 128 and ARCTICA) maintained close proximity (min 80m, avg 86m) for 53 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Ust-Luga/St. Petersburg Approach, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness25/25Min distance 80m, avg 86m
Duration10/25Duration 53 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±4m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Ust-Luga/St. Petersburg Approach

🛰️ Satellite Corroboration

? SAR Inconclusive

Satellite imagery available but requires review

Preview available for manual review

Scene: S1D_IW_GRDH_1SDV_20260828T154755_20260828T154820_004328_007FB7_E241_COG • Acquired: 2026-08-28T15:47:55.906188Z • Platform: sentinel-1d
SAR satellite preview for event 1157549

Click image to view full size

Searched: 2026-08-28T19:30:06.954161+00:00

Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 273437610,
        "imo": 8230728,
        "name": "VOLGONEFT 128",
        "flag": "RUSSIA"
    },
    "vessel_b": {
        "mmsi": 273333320,
        "imo": 6920147,
        "name": "ARCTICA",
        "flag": "Russia"
    },
    "min_distance_m": 79.7999999999999971578290569595992565155029296875,
    "avg_distance_m": 85.599999999999994315658113919198513031005859375,
    "distance_consistency_m": 3.899999999999999911182158029987476766109466552734375,
    "duration_minutes": 53.10000000000000142108547152020037174224853515625,
    "overlap_duration_s": 3185,
    "speed_a_avg": 0,
    "speed_a_std": 0,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0,
            "max_sog": 0
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-08-28T17:24:37+00:00",
        "end": "2026-08-28T18:17:42+00:00"
    },
    "points_count": {
        "vessel_a": 4,
        "vessel_b": 4
    },
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "score": {
        "value": 80,
        "components": {
            "distance_tightness": {
                "score": 25,
                "max": 25,
                "detail": "Min distance 80m, avg 86m"
            },
            "duration": {
                "score": 10,
                "max": 25,
                "detail": "Duration 53 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: Ust-Luga\/St. Petersburg Approach"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (VOLGONEFT 128 and ARCTICA) maintained close proximity (min 80m, avg 86m) for 53 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Ust-Luga\/St. Petersburg Approach, a known STS activity area."
    },
    "sar": {
        "status": "inconclusive",
        "centroid": {
            "lat": 59.88165459999999740148268756456673145294189453125,
            "lon": 30.227442499999998659632183262147009372711181640625
        },
        "time_window": {
            "start_ts": "2026-08-28T17:24:37+00:00",
            "end_ts": "2026-08-28T18:17:42+00:00"
        },
        "searched_at": "2026-08-28T19:30:06.954161+00:00",
        "scene_id": "S1D_IW_GRDH_1SDV_20260828T154755_20260828T154820_004328_007FB7_E241_COG",
        "scene_datetime": "2026-08-28T15:47:55.906188Z",
        "platform": "sentinel-1d",
        "bbox": {
            "min_lon": 25.077256999999999464989741682074964046478271484375,
            "min_lat": 59.0521049999999974033926264382898807525634765625,
            "max_lon": 30.358602999999998672819856437854468822479248046875,
            "max_lat": 60.98131599999999963301888783462345600128173828125
        },
        "assets": {
            "preview_url": "https:\/\/fleetleaks.com\/wp-content\/uploads\/fleetleaks-evidence\/sar-imagery\/2026\/08\/event_1157549_thumbnail_20260828193011.png",
            "stored_path": "\/home\/fleetleaks\/public_html\/wp-content\/uploads\/fleetleaks-evidence\/sar-imagery\/2026\/08\/event_1157549_thumbnail_20260828193011.png",
            "source": "copernicus_dataspace"
        },
        "notes": "Preview available for manual review"
    }
}
Methodology: 2026.01.18
Zone Dwell Ust-Luga/St. Petersburg Approach
Aug 28, 2026 17:24 UTC 80.0% ▼
  • Zone: Ust-Luga/St. Petersburg Approach
  • Duration: 6h 32m
  • Data Points: 16 AIS positions
  • Period: 2026-08-28T17:31:37+00:00 to 2026-08-29T00:04:33+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 392.8999999999999772626324556767940521240234375,
    "points_in_zone": 16,
    "first_point": {
        "ts": "2026-08-28T17:31:37+00:00",
        "lat": 59.8819050000000032696334528736770153045654296875,
        "lon": 30.226808299999998297380443545989692211151123046875
    },
    "last_point": {
        "ts": "2026-08-29T00:04:33+00:00",
        "lat": 59.8818083000000029869624995626509189605712890625,
        "lon": 30.226863300000001544276528875343501567840576171875
    }
}
Methodology: 2026.01.18
Loiter Ust-Luga/St. Petersburg Approach
Aug 28, 2026 17:24 UTC 75.0% ▼
  • Duration: 6h 32m
  • Radius: 11 meters
  • Data Points: 16 AIS positions
  • Centroid: 59.8819, 30.2269
  • Zone: Ust-Luga/St. Petersburg Approach
Show Raw Evidence JSON
{
    "radius_m": 10.5,
    "duration_minutes": 392.8999999999999772626324556767940521240234375,
    "points": 16,
    "centroid": {
        "lat": 59.8818680062500021676896722055971622467041015625,
        "lon": 30.2268697875000071917384047992527484893798828125
    },
    "bbox": {
        "min_lat": 59.8818083000000029869624995626509189605712890625,
        "min_lon": 30.22673830000000094742063083685934543609619140625,
        "max_lat": 59.8819349999999985811882652342319488525390625,
        "max_lon": 30.226904999999998580051396857015788555145263671875
    },
    "zone_id": "russia_ust_luga_approach"
}
Methodology: 2026.01.18
Zone Dwell Ust-Luga/St. Petersburg Approach
Aug 28, 2026 15:19 UTC 80.0% ▼
  • Zone: Ust-Luga/St. Petersburg Approach
  • Duration: 6h 31m
  • Data Points: 16 AIS positions
  • Period: 2026-08-28T15:36:42+00:00 to 2026-08-28T22:08:14+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 391.5,
    "points_in_zone": 16,
    "first_point": {
        "ts": "2026-08-28T15:36:42+00:00",
        "lat": 59.88190329999999761412254883907735347747802734375,
        "lon": 30.226813299999999884448698139749467372894287109375
    },
    "last_point": {
        "ts": "2026-08-28T22:08:14+00:00",
        "lat": 59.8818882999999999583451426587998867034912109375,
        "lon": 30.226891699999999474357537110336124897003173828125
    }
}
Methodology: 2026.01.18
Loiter Ust-Luga/St. Petersburg Approach
Aug 28, 2026 15:19 UTC 75.0% ▼
  • Duration: 6h 31m
  • Radius: 12 meters
  • Data Points: 16 AIS positions
  • Centroid: 59.8819, 30.2269
  • Zone: Ust-Luga/St. Petersburg Approach
Show Raw Evidence JSON
{
    "radius_m": 11.800000000000000710542735760100185871124267578125,
    "duration_minutes": 391.5,
    "points": 16,
    "centroid": {
        "lat": 59.881891543750015216573956422507762908935546875,
        "lon": 30.22685750000000126647137221880257129669189453125
    },
    "bbox": {
        "min_lat": 59.88182830000000222980816033668816089630126953125,
        "min_lon": 30.226808299999998297380443545989692211151123046875,
        "max_lat": 59.8819950000000034151526051573455333709716796875,
        "max_lon": 30.226904999999998580051396857015788555145263671875
    },
    "zone_id": "russia_ust_luga_approach"
}
Methodology: 2026.01.18
Zone Dwell Ust-Luga/St. Petersburg Approach
Aug 28, 2026 13:44 UTC 80.0% ▼
  • Zone: Ust-Luga/St. Petersburg Approach
  • Duration: 5h 34m
  • Data Points: 13 AIS positions
  • Period: 2026-08-28T13:44:00+00:00 to 2026-08-28T19:18:49+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 334.80000000000001136868377216160297393798828125,
    "points_in_zone": 13,
    "first_point": {
        "ts": "2026-08-28T13:44:00+00:00",
        "lat": 59.88186999999999926558302831836044788360595703125,
        "lon": 30.22682830000000109293978312052786350250244140625
    },
    "last_point": {
        "ts": "2026-08-28T19:18:49+00:00",
        "lat": 59.88191669999999788842615089379251003265380859375,
        "lon": 30.22687499999999971578290569595992565155029296875
    }
}
Methodology: 2026.01.18
Loiter Ust-Luga/St. Petersburg Approach
Aug 28, 2026 13:44 UTC 75.0% ▼
  • Duration: 5h 34m
  • Radius: 12 meters
  • Data Points: 13 AIS positions
  • Centroid: 59.8819, 30.2268
  • Zone: Ust-Luga/St. Petersburg Approach
Show Raw Evidence JSON
{
    "radius_m": 11.5999999999999996447286321199499070644378662109375,
    "duration_minutes": 334.80000000000001136868377216160297393798828125,
    "points": 13,
    "centroid": {
        "lat": 59.88189203846155095334324869327247142791748046875,
        "lon": 30.22683869999999473066054633818566799163818359375
    },
    "bbox": {
        "min_lat": 59.88182830000000222980816033668816089630126953125,
        "min_lon": 30.226808299999998297380443545989692211151123046875,
        "max_lat": 59.8819950000000034151526051573455333709716796875,
        "max_lon": 30.226904999999998580051396857015788555145263671875
    },
    "zone_id": "russia_ust_luga_approach"
}
Methodology: 2026.01.18
Zone Dwell Ust-Luga/St. Petersburg Approach
Aug 28, 2026 12:56 UTC 80.0% ▼
  • Zone: Ust-Luga/St. Petersburg Approach
  • Duration: 6h 22m
  • Data Points: 14 AIS positions
  • Period: 2026-08-28T12:56:31+00:00 to 2026-08-28T19:18:49+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 382.30000000000001136868377216160297393798828125,
    "points_in_zone": 14,
    "first_point": {
        "ts": "2026-08-28T12:56:31+00:00",
        "lat": 59.88186999999999926558302831836044788360595703125,
        "lon": 30.22682830000000109293978312052786350250244140625
    },
    "last_point": {
        "ts": "2026-08-28T19:18:49+00:00",
        "lat": 59.88191669999999788842615089379251003265380859375,
        "lon": 30.22687499999999971578290569595992565155029296875
    }
}
Methodology: 2026.01.18
Loiter Ust-Luga/St. Petersburg Approach
Aug 28, 2026 12:56 UTC 75.0% ▼
  • Duration: 6h 22m
  • Radius: 12 meters
  • Data Points: 14 AIS positions
  • Centroid: 59.8819, 30.2268
  • Zone: Ust-Luga/St. Petersburg Approach
Show Raw Evidence JSON
{
    "radius_m": 11.699999999999999289457264239899814128875732421875,
    "duration_minutes": 382.30000000000001136868377216160297393798828125,
    "points": 14,
    "centroid": {
        "lat": 59.88189046428572481772789615206420421600341796875,
        "lon": 30.22683795714285537314935936592519283294677734375
    },
    "bbox": {
        "min_lat": 59.88182830000000222980816033668816089630126953125,
        "min_lon": 30.226808299999998297380443545989692211151123046875,
        "max_lat": 59.8819950000000034151526051573455333709716796875,
        "max_lon": 30.226904999999998580051396857015788555145263671875
    },
    "zone_id": "russia_ust_luga_approach"
}
Methodology: 2026.01.18
Zone Dwell Ust-Luga/St. Petersburg Approach
Aug 28, 2026 11:45 UTC 80.0% ▼
  • Zone: Ust-Luga/St. Petersburg Approach
  • Duration: 6h 32m
  • Data Points: 12 AIS positions
  • Period: 2026-08-28T11:45:28+00:00 to 2026-08-28T18:17:42+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 392.19999999999998863131622783839702606201171875,
    "points_in_zone": 12,
    "first_point": {
        "ts": "2026-08-28T11:45:28+00:00",
        "lat": 59.88186999999999926558302831836044788360595703125,
        "lon": 30.22682830000000109293978312052786350250244140625
    },
    "last_point": {
        "ts": "2026-08-28T18:17:42+00:00",
        "lat": 59.88182830000000222980816033668816089630126953125,
        "lon": 30.226904999999998580051396857015788555145263671875
    }
}
Methodology: 2026.01.18
Loiter Ust-Luga/St. Petersburg Approach
Aug 28, 2026 11:45 UTC 75.0% ▼
  • Duration: 6h 32m
  • Radius: 11 meters
  • Data Points: 12 AIS positions
  • Centroid: 59.8819, 30.2268
  • Zone: Ust-Luga/St. Petersburg Approach
Show Raw Evidence JSON
{
    "radius_m": 10.9000000000000003552713678800500929355621337890625,
    "duration_minutes": 392.19999999999998863131622783839702606201171875,
    "points": 12,
    "centroid": {
        "lat": 59.88189693333332996871831710450351238250732421875,
        "lon": 30.226822891666667914023491903208196163177490234375
    },
    "bbox": {
        "min_lat": 59.88182830000000222980816033668816089630126953125,
        "min_lon": 30.226808299999998297380443545989692211151123046875,
        "max_lat": 59.8819950000000034151526051573455333709716796875,
        "max_lon": 30.226904999999998580051396857015788555145263671875
    },
    "zone_id": "russia_ust_luga_approach"
}
Methodology: 2026.01.18
Zone Dwell Ust-Luga/St. Petersburg Approach
Aug 28, 2026 09:25 UTC 80.0% ▼
  • Zone: Ust-Luga/St. Petersburg Approach
  • Duration: 6h 24m
  • Data Points: 10 AIS positions
  • Period: 2026-08-28T09:25:49+00:00 to 2026-08-28T15:50:35+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 384.80000000000001136868377216160297393798828125,
    "points_in_zone": 10,
    "first_point": {
        "ts": "2026-08-28T09:25:49+00:00",
        "lat": 59.88186999999999926558302831836044788360595703125,
        "lon": 30.22682830000000109293978312052786350250244140625
    },
    "last_point": {
        "ts": "2026-08-28T15:50:35+00:00",
        "lat": 59.8819950000000034151526051573455333709716796875,
        "lon": 30.2268116999999989502612152136862277984619140625
    }
}
Methodology: 2026.01.18
Loiter Ust-Luga/St. Petersburg Approach
Aug 28, 2026 09:25 UTC 75.0% ▼
  • Duration: 6h 24m
  • Radius: 11 meters
  • Data Points: 10 AIS positions
  • Centroid: 59.8819, 30.2268
  • Zone: Ust-Luga/St. Petersburg Approach
Show Raw Evidence JSON
{
    "radius_m": 11.4000000000000003552713678800500929355621337890625,
    "duration_minutes": 384.80000000000001136868377216160297393798828125,
    "points": 10,
    "centroid": {
        "lat": 59.8818924899999984745591063983738422393798828125,
        "lon": 30.226822139999995897596818394958972930908203125
    },
    "bbox": {
        "min_lat": 59.88186999999999926558302831836044788360595703125,
        "min_lon": 30.2268116999999989502612152136862277984619140625,
        "max_lat": 59.8819950000000034151526051573455333709716796875,
        "max_lon": 30.22682830000000109293978312052786350250244140625
    },
    "zone_id": "russia_ust_luga_approach"
}
Methodology: 2026.01.18
Zone Dwell Ust-Luga/St. Petersburg Approach
Aug 28, 2026 08:00 UTC 80.0% ▼
  • Zone: Ust-Luga/St. Petersburg Approach
  • Duration: 6h 33m
  • Data Points: 8 AIS positions
  • Period: 2026-08-28T08:45:33+00:00 to 2026-08-28T15:19:12+00:00
Show Raw Evidence JSON
{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 393.6000000000000227373675443232059478759765625,
    "points_in_zone": 8,
    "first_point": {
        "ts": "2026-08-28T08:45:33+00:00",
        "lat": 59.88186999999999926558302831836044788360595703125,
        "lon": 30.22682830000000109293978312052786350250244140625
    },
    "last_point": {
        "ts": "2026-08-28T15:19:12+00:00",
        "lat": 59.88190329999999761412254883907735347747802734375,
        "lon": 30.226813299999999884448698139749467372894287109375
    }
}
Methodology: 2026.01.18

Recent Position Data

Time (UTC) Lat Lon Speed Course Zone
Oct 7 23:06 59.8974 30.2165 6.6 kn 34.7° Ust-Luga/St. Petersburg Approach
Oct 4 01:25 59.8887 30.2090 1.5 kn 109.0° Ust-Luga/St. Petersburg Approach

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.