EUROSTAR 4 MARIA

{
    "vessel_a": {
        "mmsi": 273353550,
        "name": "EUROSTAR 4 MARIA",
        "flag": "RUSSIA"
    },
    "vessel_b": {
        "mmsi": 273347630,
        "imo": 8934295,
        "name": "VOLGONEFT 237",
        "flag": "RUSSIA"
    },
    "min_distance_m": 77.099999999999994315658113919198513031005859375,
    "avg_distance_m": 78.7999999999999971578290569595992565155029296875,
    "distance_consistency_m": 2.5,
    "duration_minutes": 54.2999999999999971578290569595992565155029296875,
    "overlap_duration_s": 3260,
    "speed_a_avg": 0.299999999999999988897769753748434595763683319091796875,
    "speed_a_std": 0.2800000000000000266453525910037569701671600341796875,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.299999999999999988897769753748434595763683319091796875,
            "max_sog": 0.5
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-09-06T00:12:48+00:00",
        "end": "2026-09-06T01:07:08+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": 80,
        "components": {
            "distance_tightness": {
                "score": 25,
                "max": 25,
                "detail": "Min distance 77m, avg 79m"
            },
            "duration": {
                "score": 10,
                "max": 25,
                "detail": "Duration 54 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b12m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Ust-Luga\/St. Petersburg Approach"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (EUROSTAR 4 MARIA and VOLGONEFT 237) maintained close proximity (min 77m, avg 79m) for 54 minutes. Both vessels were slow-moving (avg speeds 0.3 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": 59.8834834000000029163857107050716876983642578125,
            "lon": 30.2126133000000010042640496976673603057861328125
        },
        "time_window": {
            "start_ts": "2026-09-06T00:12:48+00:00",
            "end_ts": "2026-09-06T01:07:08+00:00"
        },
        "searched_at": "2026-09-06T06:30:01.753292+00:00",
        "scene_id": "S1C_IW_GRDH_1SDV_20260905T153123_20260905T153148_009314_012846_8E23_COG",
        "scene_datetime": "2026-09-05T15:31:23.309243Z",
        "platform": "sentinel-1c",
        "bbox": {
            "min_lon": 28.99906899999999865258359932340681552886962890625,
            "min_lat": 59.50836199999999820420271134935319423675537109375,
            "max_lon": 34.32775500000000334921423927880823612213134765625,
            "max_lat": 61.4367519999999984747773851267993450164794921875
        },
        "assets": {
            "preview_url": "https:\/\/fleetleaks.com\/wp-content\/uploads\/fleetleaks-evidence\/sar-imagery\/2026\/09\/event_1225388_thumbnail_20260906063007.png",
            "stored_path": "\/home\/fleetleaks\/public_html\/wp-content\/uploads\/fleetleaks-evidence\/sar-imagery\/2026\/09\/event_1225388_thumbnail_20260906063007.png",
            "source": "copernicus_dataspace"
        },
        "notes": "Preview available for manual review"
    }
}

Sep 6, 2026 00:12 UTC 75.0% ▼

Duration: 6h 28m
Radius: 10 meters
Data Points: 14 AIS positions
Centroid: 59.8831, 30.2124
Zone: Ust-Luga/St. Petersburg Approach

{
    "radius_m": 9.5,
    "duration_minutes": 388.80000000000001136868377216160297393798828125,
    "points": 14,
    "centroid": {
        "lat": 59.8831322642857202254162984900176525115966796875,
        "lon": 30.212396549999997574786902987398207187652587890625
    },
    "bbox": {
        "min_lat": 59.8830932999999987487171893008053302764892578125,
        "min_lon": 30.212244999999999350848156609572470188140869140625,
        "max_lat": 59.88316830000000123845893540419638156890869140625,
        "max_lon": 30.212521699999999924557414487935602664947509765625
    },
    "zone_id": "russia_ust_luga_approach"
}

Sep 5, 2026 23:03 UTC 95/100 ▼

Vessel A: MMSI 273353550 (EUROSTAR 4 MARIA) RUSSIA

Vessel B: IMO 8934295 (VOLGONEFT 237) RUSSIA

Minimum Distance: 64 meters
Average Distance: 73 meters
Duration: 2h 3m
Period: 2026-09-05T23:03:28+00:00 to 2026-09-06T01:07:08+00:00
Vessel A Avg Speed: 0.2 knots
Vessel B Avg Speed: 0.0 knots
Zone: Ust-Luga/St. Petersburg Approach

Confidence Analysis

Score: 95/100

High-confidence STS candidate. Two tankers (EUROSTAR 4 MARIA and VOLGONEFT 237) maintained close proximity (min 64m, avg 73m) for 124 minutes. Both vessels were slow-moving (avg speeds 0.2 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Ust-Luga/St. Petersburg Approach, a known STS activity area.

View scoring breakdown

Factor	Score	Detail
Distance Tightness	25/25	Min distance 64m, avg 73m
Duration	25/25	Duration 124 minutes
Speed Stability	20/20	both nearly stationary; very stable speeds
Distance Consistency	15/15	Distance variance ±6m
Isolation	5/10	Isolation data not available
Context	5/5	In 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_20260905T153123_20260905T153148_009314_012846_8E23_COG • Acquired: 2026-09-05T15:31:23.309243Z • Platform: sentinel-1c

Click image to view full size

Searched: 2026-09-06T05:45:02.011405+00:00

{
    "vessel_a": {
        "mmsi": 273353550,
        "name": "EUROSTAR 4 MARIA",
        "flag": "RUSSIA"
    },
    "vessel_b": {
        "mmsi": 273347630,
        "imo": 8934295,
        "name": "VOLGONEFT 237",
        "flag": "RUSSIA"
    },
    "min_distance_m": 64.099999999999994315658113919198513031005859375,
    "avg_distance_m": 73.099999999999994315658113919198513031005859375,
    "distance_consistency_m": 5.79999999999999982236431605997495353221893310546875,
    "duration_minutes": 123.7000000000000028421709430404007434844970703125,
    "overlap_duration_s": 7420,
    "speed_a_avg": 0.2399999999999999911182158029987476766109466552734375,
    "speed_a_std": 0.179999999999999993338661852249060757458209991455078125,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.2399999999999999911182158029987476766109466552734375,
            "max_sog": 0.5
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-09-05T23:03:28+00:00",
        "end": "2026-09-06T01:07:08+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": 95,
        "components": {
            "distance_tightness": {
                "score": 25,
                "max": 25,
                "detail": "Min distance 64m, avg 73m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 124 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 (EUROSTAR 4 MARIA and VOLGONEFT 237) maintained close proximity (min 64m, avg 73m) for 124 minutes. Both vessels were slow-moving (avg speeds 0.2 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Ust-Luga\/St. Petersburg Approach, a known STS activity area."
    },
    "sar": {
        "status": "inconclusive",
        "centroid": {
            "lat": 59.88346030000000297377482638694345951080322265625,
            "lon": 30.21256939999999957535692374221980571746826171875
        },
        "time_window": {
            "start_ts": "2026-09-05T23:03:28+00:00",
            "end_ts": "2026-09-06T01:07:08+00:00"
        },
        "searched_at": "2026-09-06T05:45:02.011405+00:00",
        "scene_id": "S1C_IW_GRDH_1SDV_20260905T153123_20260905T153148_009314_012846_8E23_COG",
        "scene_datetime": "2026-09-05T15:31:23.309243Z",
        "platform": "sentinel-1c",
        "bbox": {
            "min_lon": 28.99906899999999865258359932340681552886962890625,
            "min_lat": 59.50836199999999820420271134935319423675537109375,
            "max_lon": 34.32775500000000334921423927880823612213134765625,
            "max_lat": 61.4367519999999984747773851267993450164794921875
        },
        "assets": {
            "preview_url": "https:\/\/fleetleaks.com\/wp-content\/uploads\/fleetleaks-evidence\/sar-imagery\/2026\/09\/event_1224935_thumbnail_20260906054506.png",
            "stored_path": "\/home\/fleetleaks\/public_html\/wp-content\/uploads\/fleetleaks-evidence\/sar-imagery\/2026\/09\/event_1224935_thumbnail_20260906054506.png",
            "source": "copernicus_dataspace"
        },
        "notes": "Preview available for manual review"
    }
}

Sep 5, 2026 23:03 UTC 80.0% ▼

Zone: Ust-Luga/St. Petersburg Approach
Duration: 6h 29m
Data Points: 14 AIS positions
Period: 2026-09-05T23:51:48+00:00 to 2026-09-06T06:20:58+00:00

{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 389.19999999999998863131622783839702606201171875,
    "points_in_zone": 14,
    "first_point": {
        "ts": "2026-09-05T23:51:48+00:00",
        "lat": 59.883143300000000408545020036399364471435546875,
        "lon": 30.21245499999999850615495233796536922454833984375
    },
    "last_point": {
        "ts": "2026-09-06T06:20:58+00:00",
        "lat": 59.8831483000000019956132746301591396331787109375,
        "lon": 30.2124783000000007859853212721645832061767578125
    }
}

Sep 5, 2026 23:03 UTC 75.0% ▼

Duration: 6h 29m
Radius: 9 meters
Data Points: 14 AIS positions
Centroid: 59.8831, 30.2124
Zone: Ust-Luga/St. Petersburg Approach

{
    "radius_m": 9.199999999999999289457264239899814128875732421875,
    "duration_minutes": 389.19999999999998863131622783839702606201171875,
    "points": 14,
    "centroid": {
        "lat": 59.88313119285714236639250884763896465301513671875,
        "lon": 30.21239119285714735951842158101499080657958984375
    },
    "bbox": {
        "min_lat": 59.8830932999999987487171893008053302764892578125,
        "min_lon": 30.212244999999999350848156609572470188140869140625,
        "max_lat": 59.88316830000000123845893540419638156890869140625,
        "max_lon": 30.2124783000000007859853212721645832061767578125
    },
    "zone_id": "russia_ust_luga_approach"
}

Sep 5, 2026 22:33 UTC 95/100 ▼

Vessel A: MMSI 273353550 (EUROSTAR 4 MARIA) RUSSIA

Vessel B: IMO 8934295 (VOLGONEFT 237) RUSSIA

Minimum Distance: 64 meters
Average Distance: 73 meters
Duration: 2h 33m
Period: 2026-09-05T22:33:28+00:00 to 2026-09-06T01:07:08+00:00
Vessel A Avg Speed: 0.2 knots
Vessel B Avg Speed: 0.0 knots
Zone: Ust-Luga/St. Petersburg Approach

Confidence Analysis

Score: 95/100

High-confidence STS candidate. Two tankers (EUROSTAR 4 MARIA and VOLGONEFT 237) maintained close proximity (min 64m, avg 73m) for 154 minutes. Both vessels were slow-moving (avg speeds 0.2 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Ust-Luga/St. Petersburg Approach, a known STS activity area.

View scoring breakdown

Factor	Score	Detail
Distance Tightness	25/25	Min distance 64m, avg 73m
Duration	25/25	Duration 154 minutes
Speed Stability	20/20	both nearly stationary; very stable speeds
Distance Consistency	15/15	Distance variance ±5m
Isolation	5/10	Isolation data not available
Context	5/5	In 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_20260905T153123_20260905T153148_009314_012846_8E23_COG • Acquired: 2026-09-05T15:31:23.309243Z • Platform: sentinel-1c

Click image to view full size

Searched: 2026-09-06T04:45:04.322839+00:00

{
    "vessel_a": {
        "mmsi": 273353550,
        "name": "EUROSTAR 4 MARIA",
        "flag": "RUSSIA"
    },
    "vessel_b": {
        "mmsi": 273347630,
        "imo": 8934295,
        "name": "VOLGONEFT 237",
        "flag": "RUSSIA"
    },
    "min_distance_m": 64.099999999999994315658113919198513031005859375,
    "avg_distance_m": 73.2999999999999971578290569595992565155029296875,
    "distance_consistency_m": 4.79999999999999982236431605997495353221893310546875,
    "duration_minutes": 153.69999999999998863131622783839702606201171875,
    "overlap_duration_s": 9220,
    "speed_a_avg": 0.2300000000000000099920072216264088638126850128173828125,
    "speed_a_std": 0.1600000000000000033306690738754696212708950042724609375,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.2300000000000000099920072216264088638126850128173828125,
            "max_sog": 0.5
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-09-05T22:33:28+00:00",
        "end": "2026-09-06T01:07:08+00:00"
    },
    "points_count": {
        "vessel_a": 10,
        "vessel_b": 10
    },
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "score": {
        "value": 95,
        "components": {
            "distance_tightness": {
                "score": 25,
                "max": 25,
                "detail": "Min distance 64m, avg 73m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 154 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b15m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Ust-Luga\/St. Petersburg Approach"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (EUROSTAR 4 MARIA and VOLGONEFT 237) maintained close proximity (min 64m, avg 73m) for 154 minutes. Both vessels were slow-moving (avg speeds 0.2 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Ust-Luga\/St. Petersburg Approach, a known STS activity area."
    },
    "sar": {
        "status": "inconclusive",
        "centroid": {
            "lat": 59.883485100000001466469257138669490814208984375,
            "lon": 30.21259570000000138634277391247451305389404296875
        },
        "time_window": {
            "start_ts": "2026-09-05T22:33:28+00:00",
            "end_ts": "2026-09-06T01:07:08+00:00"
        },
        "searched_at": "2026-09-06T04:45:04.322839+00:00",
        "scene_id": "S1C_IW_GRDH_1SDV_20260905T153123_20260905T153148_009314_012846_8E23_COG",
        "scene_datetime": "2026-09-05T15:31:23.309243Z",
        "platform": "sentinel-1c",
        "bbox": {
            "min_lon": 28.99906899999999865258359932340681552886962890625,
            "min_lat": 59.50836199999999820420271134935319423675537109375,
            "max_lon": 34.32775500000000334921423927880823612213134765625,
            "max_lat": 61.4367519999999984747773851267993450164794921875
        },
        "assets": {
            "preview_url": "https:\/\/fleetleaks.com\/wp-content\/uploads\/fleetleaks-evidence\/sar-imagery\/2026\/09\/event_1224762_thumbnail_20260906044509.png",
            "stored_path": "\/home\/fleetleaks\/public_html\/wp-content\/uploads\/fleetleaks-evidence\/sar-imagery\/2026\/09\/event_1224762_thumbnail_20260906044509.png",
            "source": "copernicus_dataspace"
        },
        "notes": "Preview available for manual review"
    }
}

Sep 5, 2026 22:00 UTC 80.0% ▼

Zone: Ust-Luga/St. Petersburg Approach
Duration: 6h 33m
Data Points: 19 AIS positions
Period: 2026-09-05T22:00:49+00:00 to 2026-09-06T04:33:59+00:00

{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 393.19999999999998863131622783839702606201171875,
    "points_in_zone": 19,
    "first_point": {
        "ts": "2026-09-05T22:00:49+00:00",
        "lat": 59.88325329999999979690983309410512447357177734375,
        "lon": 30.212566699999999997316990629769861698150634765625
    },
    "last_point": {
        "ts": "2026-09-06T04:33:59+00:00",
        "lat": 59.8830932999999987487171893008053302764892578125,
        "lon": 30.212244999999999350848156609572470188140869140625
    }
}

Sep 5, 2026 22:00 UTC 75.0% ▼

Duration: 6h 33m
Radius: 13 meters
Data Points: 19 AIS positions
Centroid: 59.8832, 30.2124
Zone: Ust-Luga/St. Petersburg Approach

{
    "radius_m": 13.4000000000000003552713678800500929355621337890625,
    "duration_minutes": 393.19999999999998863131622783839702606201171875,
    "points": 19,
    "centroid": {
        "lat": 59.88315298421051835475736879743635654449462890625,
        "lon": 30.21243395263157793806385598145425319671630859375
    },
    "bbox": {
        "min_lat": 59.8830932999999987487171893008053302764892578125,
        "min_lon": 30.212244999999999350848156609572470188140869140625,
        "max_lat": 59.88325329999999979690983309410512447357177734375,
        "max_lon": 30.212591700000000827230905997566878795623779296875
    },
    "zone_id": "russia_ust_luga_approach"
}

Sep 5, 2026 21:26 UTC 95/100 ▼

Vessel A: MMSI 273353550 (EUROSTAR 4 MARIA) RUSSIA

Vessel B: IMO 8934295 (VOLGONEFT 237) RUSSIA

Minimum Distance: 64 meters
Average Distance: 74 meters
Duration: 3h 40m
Period: 2026-09-05T21:26:48+00:00 to 2026-09-06T01:07:08+00:00
Vessel A Avg Speed: 0.2 knots
Vessel B Avg Speed: 0.1 knots
Zone: Ust-Luga/St. Petersburg Approach

Confidence Analysis

Score: 95/100

High-confidence STS candidate. Two tankers (EUROSTAR 4 MARIA and VOLGONEFT 237) maintained close proximity (min 64m, avg 74m) for 220 minutes. Both vessels were slow-moving (avg speeds 0.2 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

Factor	Score	Detail
Distance Tightness	25/25	Min distance 64m, avg 74m
Duration	25/25	Duration 220 minutes
Speed Stability	20/20	both nearly stationary; very stable speeds
Distance Consistency	15/15	Distance variance ±5m
Isolation	5/10	Isolation data not available
Context	5/5	In monitored zone: Ust-Luga/St. Petersburg Approach

Show Raw Evidence JSON

{
    "vessel_a": {
        "mmsi": 273353550,
        "name": "EUROSTAR 4 MARIA",
        "flag": "RUSSIA"
    },
    "vessel_b": {
        "mmsi": 273347630,
        "imo": 8934295,
        "name": "VOLGONEFT 237",
        "flag": "RUSSIA"
    },
    "min_distance_m": 64.099999999999994315658113919198513031005859375,
    "avg_distance_m": 74,
    "distance_consistency_m": 5.29999999999999982236431605997495353221893310546875,
    "duration_minutes": 220.30000000000001136868377216160297393798828125,
    "overlap_duration_s": 13220,
    "speed_a_avg": 0.200000000000000011102230246251565404236316680908203125,
    "speed_a_std": 0.1499999999999999944488848768742172978818416595458984375,
    "speed_b_avg": 0.070000000000000006661338147750939242541790008544921875,
    "speed_b_std": 0.179999999999999993338661852249060757458209991455078125,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.200000000000000011102230246251565404236316680908203125,
            "max_sog": 0.5
        },
        "vessel_b": {
            "avg_sog": 0.070000000000000006661338147750939242541790008544921875,
            "max_sog": 0.5
        }
    },
    "time_window": {
        "start": "2026-09-05T21:26:48+00:00",
        "end": "2026-09-06T01:07:08+00:00"
    },
    "points_count": {
        "vessel_a": 15,
        "vessel_b": 15
    },
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "score": {
        "value": 95,
        "components": {
            "distance_tightness": {
                "score": 25,
                "max": 25,
                "detail": "Min distance 64m, avg 74m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 220 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b15m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Ust-Luga\/St. Petersburg Approach"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (EUROSTAR 4 MARIA and VOLGONEFT 237) maintained close proximity (min 64m, avg 74m) for 220 minutes. Both vessels were slow-moving (avg speeds 0.2 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

Zone Dwell Ust-Luga/St. Petersburg Approach

Sep 5, 2026 21:01 UTC 80.0% ▼

Zone: Ust-Luga/St. Petersburg Approach
Duration: 6h 28m
Data Points: 22 AIS positions
Period: 2026-09-05T21:26:48+00:00 to 2026-09-06T03:55:39+00:00

Show Raw Evidence JSON

{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 388.8999999999999772626324556767940521240234375,
    "points_in_zone": 22,
    "first_point": {
        "ts": "2026-09-05T21:26:48+00:00",
        "lat": 59.88321669999999841138560441322624683380126953125,
        "lon": 30.212540000000000617319528828375041484832763671875
    },
    "last_point": {
        "ts": "2026-09-06T03:55:39+00:00",
        "lat": 59.8831167000000021971573005430400371551513671875,
        "lon": 30.21237500000000153477230924181640148162841796875
    }
}

Methodology: 2026.01.18

Loiter Ust-Luga/St. Petersburg Approach

Sep 5, 2026 21:01 UTC 75.0% ▼

Duration: 6h 28m
Radius: 11 meters
Data Points: 22 AIS positions
Centroid: 59.8832, 30.2125
Zone: Ust-Luga/St. Petersburg Approach

Show Raw Evidence JSON

{
    "radius_m": 11.300000000000000710542735760100185871124267578125,
    "duration_minutes": 388.8999999999999772626324556767940521240234375,
    "points": 22,
    "centroid": {
        "lat": 59.88316674545455242650859872810542583465576171875,
        "lon": 30.21245984999999478759491466917097568511962890625
    },
    "bbox": {
        "min_lat": 59.883111700000000610089045949280261993408203125,
        "min_lon": 30.212306699999999182182364165782928466796875,
        "max_lat": 59.88325329999999979690983309410512447357177734375,
        "max_lon": 30.212591700000000827230905997566878795623779296875
    },
    "zone_id": "russia_ust_luga_approach"
}

Methodology: 2026.01.18

Zone Dwell Ust-Luga/St. Petersburg Approach

Sep 4, 2026 09:16 UTC 80.0% ▼

Zone: Ust-Luga/St. Petersburg Approach
Duration: 1h 4m
Data Points: 4 AIS positions
Period: 2026-09-04T09:16:03+00:00 to 2026-09-04T10:20:02+00:00

Show Raw Evidence JSON

{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 64,
    "points_in_zone": 4,
    "first_point": {
        "ts": "2026-09-04T09:16:03+00:00",
        "lat": 59.8831483000000019956132746301591396331787109375,
        "lon": 30.21249830000000002883098204620182514190673828125
    },
    "last_point": {
        "ts": "2026-09-04T10:20:02+00:00",
        "lat": 59.88311499999999654164639650844037532806396484375,
        "lon": 30.212358300000001776197677827440202236175537109375
    }
}

Methodology: 2026.01.18

Sts Ust-Luga/St. Petersburg Approach

Sep 4, 2026 09:07 UTC 80/100 ▼

Vessel A: MMSI 273353550 (EUROSTAR 4 MARIA) RUSSIA

Vessel B: IMO 9751913 (BALT FLOT 4) RUSSIA

Minimum Distance: 165 meters
Average Distance: 176 meters
Duration: 1h 4m
Period: 2026-09-04T09:16:03+00:00 to 2026-09-04T10:20:02+00:00
Vessel A Avg Speed: 0.3 knots
Vessel B Avg Speed: 0.3 knots
Zone: Ust-Luga/St. Petersburg Approach

Confidence Analysis

Score: 80/100

High-confidence STS candidate. Two tankers (EUROSTAR 4 MARIA and BALT FLOT 4) maintained close proximity (min 165m, avg 176m) for 64 minutes. Both vessels were slow-moving (avg speeds 0.2 and 0.3 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

Factor	Score	Detail
Distance Tightness	20/25	Min distance 165m, avg 176m
Duration	15/25	Duration 64 minutes
Speed Stability	20/20	both nearly stationary; very stable speeds
Distance Consistency	15/15	Distance variance ±9m
Isolation	5/10	Isolation data not available
Context	5/5	In monitored zone: Ust-Luga/St. Petersburg Approach

Show Raw Evidence JSON

{
    "vessel_a": {
        "mmsi": 273353550,
        "name": "EUROSTAR 4 MARIA",
        "flag": "RUSSIA"
    },
    "vessel_b": {
        "mmsi": 273383250,
        "imo": 9751913,
        "name": "BALT FLOT 4",
        "flag": "RUSSIA"
    },
    "min_distance_m": 164.599999999999994315658113919198513031005859375,
    "avg_distance_m": 175.5,
    "distance_consistency_m": 9.199999999999999289457264239899814128875732421875,
    "duration_minutes": 64,
    "overlap_duration_s": 3839,
    "speed_a_avg": 0.25,
    "speed_a_std": 0.25,
    "speed_b_avg": 0.299999999999999988897769753748434595763683319091796875,
    "speed_b_std": 0.14000000000000001332267629550187848508358001708984375,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.25,
            "max_sog": 0.59999999999999997779553950749686919152736663818359375
        },
        "vessel_b": {
            "avg_sog": 0.299999999999999988897769753748434595763683319091796875,
            "max_sog": 0.40000000000000002220446049250313080847263336181640625
        }
    },
    "time_window": {
        "start": "2026-09-04T09:16:03+00:00",
        "end": "2026-09-04T10:20:02+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": 20,
                "max": 25,
                "detail": "Min distance 165m, avg 176m"
            },
            "duration": {
                "score": 15,
                "max": 25,
                "detail": "Duration 64 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b19m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Ust-Luga\/St. Petersburg Approach"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (EUROSTAR 4 MARIA and BALT FLOT 4) maintained close proximity (min 165m, avg 176m) for 64 minutes. Both vessels were slow-moving (avg speeds 0.2 and 0.3 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

Sep 4, 2026 08:31 UTC 80.0% ▼

Zone: Ust-Luga/St. Petersburg Approach
Duration: 1h 49m
Data Points: 5 AIS positions
Period: 2026-09-04T08:31:02+00:00 to 2026-09-04T10:20:02+00:00

Show Raw Evidence JSON

{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 109,
    "points_in_zone": 5,
    "first_point": {
        "ts": "2026-09-04T08:31:02+00:00",
        "lat": 59.8831050000000004729372449219226837158203125,
        "lon": 30.212360000000000326281224261038005352020263671875
    },
    "last_point": {
        "ts": "2026-09-04T10:20:02+00:00",
        "lat": 59.88311499999999654164639650844037532806396484375,
        "lon": 30.212358300000001776197677827440202236175537109375
    }
}

Methodology: 2026.01.18

Sts🛰️? Ust-Luga/St. Petersburg Approach

Sep 4, 2026 08:31 UTC 85/100 ▼

Vessel A: MMSI 273353550 (EUROSTAR 4 MARIA) RUSSIA

Vessel B: IMO 9751913 (BALT FLOT 4) RUSSIA

Minimum Distance: 165 meters
Average Distance: 178 meters
Duration: 1h 49m
Period: 2026-09-04T08:31:02+00:00 to 2026-09-04T10:20:02+00:00
Vessel A Avg Speed: 0.3 knots
Vessel B Avg Speed: 0.3 knots
Zone: Ust-Luga/St. Petersburg Approach

Confidence Analysis

Score: 85/100

High-confidence STS candidate. Two tankers (EUROSTAR 4 MARIA and BALT FLOT 4) maintained close proximity (min 165m, avg 178m) for 109 minutes. Both vessels were slow-moving (avg speeds 0.3 and 0.3 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

Factor	Score	Detail
Distance Tightness	20/25	Min distance 165m, avg 178m
Duration	20/25	Duration 109 minutes
Speed Stability	20/20	both nearly stationary; very stable speeds
Distance Consistency	15/15	Distance variance ±10m
Isolation	5/10	Isolation data not available
Context	5/5	In 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_20260904T042458_20260904T042523_004423_008311_C3D2_COG • Acquired: 2026-09-04T04:24:58.252771Z • Platform: sentinel-1d

Click image to view full size

Searched: 2026-09-04T14:15:04.226984+00:00

{
    "vessel_a": {
        "mmsi": 273353550,
        "name": "EUROSTAR 4 MARIA",
        "flag": "RUSSIA"
    },
    "vessel_b": {
        "mmsi": 273383250,
        "imo": 9751913,
        "name": "BALT FLOT 4",
        "flag": "RUSSIA"
    },
    "min_distance_m": 164.599999999999994315658113919198513031005859375,
    "avg_distance_m": 178,
    "distance_consistency_m": 9.699999999999999289457264239899814128875732421875,
    "duration_minutes": 109,
    "overlap_duration_s": 6540,
    "speed_a_avg": 0.2600000000000000088817841970012523233890533447265625,
    "speed_a_std": 0.2200000000000000011102230246251565404236316680908203125,
    "speed_b_avg": 0.2800000000000000266453525910037569701671600341796875,
    "speed_b_std": 0.13000000000000000444089209850062616169452667236328125,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.2600000000000000088817841970012523233890533447265625,
            "max_sog": 0.59999999999999997779553950749686919152736663818359375
        },
        "vessel_b": {
            "avg_sog": 0.2800000000000000266453525910037569701671600341796875,
            "max_sog": 0.40000000000000002220446049250313080847263336181640625
        }
    },
    "time_window": {
        "start": "2026-09-04T08:31:02+00:00",
        "end": "2026-09-04T10:20:02+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": 85,
        "components": {
            "distance_tightness": {
                "score": 20,
                "max": 25,
                "detail": "Min distance 165m, avg 178m"
            },
            "duration": {
                "score": 20,
                "max": 25,
                "detail": "Duration 109 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b110m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Ust-Luga\/St. Petersburg Approach"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (EUROSTAR 4 MARIA and BALT FLOT 4) maintained close proximity (min 165m, avg 178m) for 109 minutes. Both vessels were slow-moving (avg speeds 0.3 and 0.3 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": 59.88389269999999697802195441909134387969970703125,
            "lon": 30.2128617999999988796844263561069965362548828125
        },
        "time_window": {
            "start_ts": "2026-09-04T08:31:02+00:00",
            "end_ts": "2026-09-04T10:20:02+00:00"
        },
        "searched_at": "2026-09-04T14:15:04.226984+00:00",
        "scene_id": "S1D_IW_GRDH_1SDV_20260904T042458_20260904T042523_004423_008311_C3D2_COG",
        "scene_datetime": "2026-09-04T04:24:58.252771Z",
        "platform": "sentinel-1d",
        "bbox": {
            "min_lon": 26.619164999999998855173544143326580524444580078125,
            "min_lat": 59.33262599999999764577296446077525615692138671875,
            "max_lon": 31.930068999999999590500010526739060878753662109375,
            "max_lat": 61.26116900000000242698661168105900287628173828125
        },
        "assets": {
            "preview_url": "https:\/\/fleetleaks.com\/wp-content\/uploads\/fleetleaks-evidence\/sar-imagery\/2026\/09\/event_1206928_thumbnail_20260904141509.png",
            "stored_path": "\/home\/fleetleaks\/public_html\/wp-content\/uploads\/fleetleaks-evidence\/sar-imagery\/2026\/09\/event_1206928_thumbnail_20260904141509.png",
            "source": "copernicus_dataspace"
        },
        "notes": "Preview available for manual review"
    }
}

Sep 4, 2026 07:14 UTC 90/100 ▼

Vessel A: MMSI 273353550 (EUROSTAR 4 MARIA) RUSSIA

Vessel B: IMO 9751913 (BALT FLOT 4) RUSSIA

Minimum Distance: 165 meters
Average Distance: 177 meters
Duration: 3h 5m
Period: 2026-09-04T07:14:44+00:00 to 2026-09-04T10:20:02+00:00
Vessel A Avg Speed: 0.3 knots
Vessel B Avg Speed: 0.3 knots
Zone: Ust-Luga/St. Petersburg Approach

Confidence Analysis

Score: 90/100

High-confidence STS candidate. Two tankers (EUROSTAR 4 MARIA and BALT FLOT 4) maintained close proximity (min 165m, avg 177m) for 185 minutes. Both vessels were slow-moving (avg speeds 0.3 and 0.3 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

Factor	Score	Detail
Distance Tightness	20/25	Min distance 165m, avg 177m
Duration	25/25	Duration 185 minutes
Speed Stability	20/20	both nearly stationary; very stable speeds
Distance Consistency	15/15	Distance variance ±9m
Isolation	5/10	Isolation data not available
Context	5/5	In 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_20260904T042458_20260904T042523_004423_008311_C3D2_COG • Acquired: 2026-09-04T04:24:58.252771Z • Platform: sentinel-1d

Click image to view full size

Searched: 2026-09-04T13:30:04.432419+00:00

{
    "vessel_a": {
        "mmsi": 273353550,
        "name": "EUROSTAR 4 MARIA",
        "flag": "RUSSIA"
    },
    "vessel_b": {
        "mmsi": 273383250,
        "imo": 9751913,
        "name": "BALT FLOT 4",
        "flag": "RUSSIA"
    },
    "min_distance_m": 164.599999999999994315658113919198513031005859375,
    "avg_distance_m": 177.099999999999994315658113919198513031005859375,
    "distance_consistency_m": 8.9000000000000003552713678800500929355621337890625,
    "duration_minutes": 185.30000000000001136868377216160297393798828125,
    "overlap_duration_s": 11118,
    "speed_a_avg": 0.270000000000000017763568394002504646778106689453125,
    "speed_a_std": 0.200000000000000011102230246251565404236316680908203125,
    "speed_b_avg": 0.2800000000000000266453525910037569701671600341796875,
    "speed_b_std": 0.11999999999999999555910790149937383830547332763671875,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.270000000000000017763568394002504646778106689453125,
            "max_sog": 0.59999999999999997779553950749686919152736663818359375
        },
        "vessel_b": {
            "avg_sog": 0.2800000000000000266453525910037569701671600341796875,
            "max_sog": 0.40000000000000002220446049250313080847263336181640625
        }
    },
    "time_window": {
        "start": "2026-09-04T07:14:44+00:00",
        "end": "2026-09-04T10:20:02+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": 90,
        "components": {
            "distance_tightness": {
                "score": 20,
                "max": 25,
                "detail": "Min distance 165m, avg 177m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 185 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b19m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Ust-Luga\/St. Petersburg Approach"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (EUROSTAR 4 MARIA and BALT FLOT 4) maintained close proximity (min 165m, avg 177m) for 185 minutes. Both vessels were slow-moving (avg speeds 0.3 and 0.3 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": 59.8838975000000033332980819977819919586181640625,
            "lon": 30.212872499999999575948095298372209072113037109375
        },
        "time_window": {
            "start_ts": "2026-09-04T07:14:44+00:00",
            "end_ts": "2026-09-04T10:20:02+00:00"
        },
        "searched_at": "2026-09-04T13:30:04.432419+00:00",
        "scene_id": "S1D_IW_GRDH_1SDV_20260904T042458_20260904T042523_004423_008311_C3D2_COG",
        "scene_datetime": "2026-09-04T04:24:58.252771Z",
        "platform": "sentinel-1d",
        "bbox": {
            "min_lon": 26.619164999999998855173544143326580524444580078125,
            "min_lat": 59.33262599999999764577296446077525615692138671875,
            "max_lon": 31.930068999999999590500010526739060878753662109375,
            "max_lat": 61.26116900000000242698661168105900287628173828125
        },
        "assets": {
            "preview_url": "https:\/\/fleetleaks.com\/wp-content\/uploads\/fleetleaks-evidence\/sar-imagery\/2026\/09\/event_1206635_thumbnail_20260904133016.png",
            "stored_path": "\/home\/fleetleaks\/public_html\/wp-content\/uploads\/fleetleaks-evidence\/sar-imagery\/2026\/09\/event_1206635_thumbnail_20260904133016.png",
            "source": "copernicus_dataspace"
        },
        "notes": "Preview available for manual review"
    }
}

Sep 4, 2026 07:14 UTC 80.0% ▼

Zone: Ust-Luga/St. Petersburg Approach
Duration: 3h 5m
Data Points: 6 AIS positions
Period: 2026-09-04T07:14:44+00:00 to 2026-09-04T10:20:02+00:00

{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 185.30000000000001136868377216160297393798828125,
    "points_in_zone": 6,
    "first_point": {
        "ts": "2026-09-04T07:14:44+00:00",
        "lat": 59.88317669999999992569428286515176296234130859375,
        "lon": 30.21250500000000016598278307355940341949462890625
    },
    "last_point": {
        "ts": "2026-09-04T10:20:02+00:00",
        "lat": 59.88311499999999654164639650844037532806396484375,
        "lon": 30.212358300000001776197677827440202236175537109375
    }
}

Sep 4, 2026 06:38 UTC 90/100 ▼

Vessel A: MMSI 273353550 (EUROSTAR 4 MARIA) RUSSIA

Vessel B: IMO 9751913 (BALT FLOT 4) RUSSIA

Minimum Distance: 165 meters
Average Distance: 180 meters
Duration: 3h 42m
Period: 2026-09-04T06:38:04+00:00 to 2026-09-04T10:20:02+00:00
Vessel A Avg Speed: 0.3 knots
Vessel B Avg Speed: 0.3 knots
Zone: Ust-Luga/St. Petersburg Approach

Confidence Analysis

Score: 90/100

High-confidence STS candidate. Two tankers (EUROSTAR 4 MARIA and BALT FLOT 4) maintained close proximity (min 165m, avg 180m) for 222 minutes. Both vessels were slow-moving (avg speeds 0.3 and 0.3 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

Factor	Score	Detail
Distance Tightness	20/25	Min distance 165m, avg 180m
Duration	25/25	Duration 222 minutes
Speed Stability	20/20	both nearly stationary; very stable speeds
Distance Consistency	15/15	Distance variance ±12m
Isolation	5/10	Isolation data not available
Context	5/5	In monitored zone: Ust-Luga/St. Petersburg Approach

Show Raw Evidence JSON

{
    "vessel_a": {
        "mmsi": 273353550,
        "name": "EUROSTAR 4 MARIA",
        "flag": "RUSSIA"
    },
    "vessel_b": {
        "mmsi": 273383250,
        "imo": 9751913,
        "name": "BALT FLOT 4",
        "flag": "RUSSIA"
    },
    "min_distance_m": 164.599999999999994315658113919198513031005859375,
    "avg_distance_m": 180.19999999999998863131622783839702606201171875,
    "distance_consistency_m": 11.5999999999999996447286321199499070644378662109375,
    "duration_minutes": 222,
    "overlap_duration_s": 13318,
    "speed_a_avg": 0.2600000000000000088817841970012523233890533447265625,
    "speed_a_std": 0.179999999999999993338661852249060757458209991455078125,
    "speed_b_avg": 0.309999999999999997779553950749686919152736663818359375,
    "speed_b_std": 0.13000000000000000444089209850062616169452667236328125,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.2600000000000000088817841970012523233890533447265625,
            "max_sog": 0.59999999999999997779553950749686919152736663818359375
        },
        "vessel_b": {
            "avg_sog": 0.309999999999999997779553950749686919152736663818359375,
            "max_sog": 0.5
        }
    },
    "time_window": {
        "start": "2026-09-04T06:38:04+00:00",
        "end": "2026-09-04T10:20:02+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": 90,
        "components": {
            "distance_tightness": {
                "score": 20,
                "max": 25,
                "detail": "Min distance 165m, avg 180m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 222 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b112m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Ust-Luga\/St. Petersburg Approach"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (EUROSTAR 4 MARIA and BALT FLOT 4) maintained close proximity (min 165m, avg 180m) for 222 minutes. Both vessels were slow-moving (avg speeds 0.3 and 0.3 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

Sep 4, 2026 06:38 UTC 80.0% ▼

Zone: Ust-Luga/St. Petersburg Approach
Duration: 3h 42m
Data Points: 7 AIS positions
Period: 2026-09-04T06:38:04+00:00 to 2026-09-04T10:20:02+00:00

Show Raw Evidence JSON

{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 222,
    "points_in_zone": 7,
    "first_point": {
        "ts": "2026-09-04T06:38:04+00:00",
        "lat": 59.88316830000000123845893540419638156890869140625,
        "lon": 30.21245329999999995607140590436756610870361328125
    },
    "last_point": {
        "ts": "2026-09-04T10:20:02+00:00",
        "lat": 59.88311499999999654164639650844037532806396484375,
        "lon": 30.212358300000001776197677827440202236175537109375
    }
}

Methodology: 2026.01.18

Zone Dwell Ust-Luga/St. Petersburg Approach

Sep 4, 2026 05:07 UTC 80.0% ▼

Zone: Ust-Luga/St. Petersburg Approach
Duration: 5h 12m
Data Points: 11 AIS positions
Period: 2026-09-04T05:07:24+00:00 to 2026-09-04T10:20:02+00:00

Show Raw Evidence JSON

{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 312.6000000000000227373675443232059478759765625,
    "points_in_zone": 11,
    "first_point": {
        "ts": "2026-09-04T05:07:24+00:00",
        "lat": 59.88320829999999972415025695227086544036865234375,
        "lon": 30.212540000000000617319528828375041484832763671875
    },
    "last_point": {
        "ts": "2026-09-04T10:20:02+00:00",
        "lat": 59.88311499999999654164639650844037532806396484375,
        "lon": 30.212358300000001776197677827440202236175537109375
    }
}

Methodology: 2026.01.18

Loiter Ust-Luga/St. Petersburg Approach

Sep 4, 2026 05:07 UTC 75.0% ▼

Duration: 5h 12m
Radius: 9 meters
Data Points: 11 AIS positions
Centroid: 59.8832, 30.2125
Zone: Ust-Luga/St. Petersburg Approach

Show Raw Evidence JSON

{
    "radius_m": 8.9000000000000003552713678800500929355621337890625,
    "duration_minutes": 312.6000000000000227373675443232059478759765625,
    "points": 11,
    "centroid": {
        "lat": 59.8831648363636332987880450673401355743408203125,
        "lon": 30.2124643909090906390702002681791782379150390625
    },
    "bbox": {
        "min_lat": 59.8831050000000004729372449219226837158203125,
        "min_lon": 30.212358300000001776197677827440202236175537109375,
        "max_lat": 59.88321330000000131121851154603064060211181640625,
        "max_lon": 30.212541699999999167403075261972844600677490234375
    },
    "zone_id": "russia_ust_luga_approach"
}

Methodology: 2026.01.18

Zone Dwell Ust-Luga/St. Petersburg Approach

Sep 4, 2026 02:05 UTC 80.0% ▼

Zone: Ust-Luga/St. Petersburg Approach
Duration: 6h 25m
Data Points: 8 AIS positions
Period: 2026-09-04T02:05:23+00:00 to 2026-09-04T08:31:02+00:00

Show Raw Evidence JSON

{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 385.6000000000000227373675443232059478759765625,
    "points_in_zone": 8,
    "first_point": {
        "ts": "2026-09-04T02:05:23+00:00",
        "lat": 59.88323170000000317259036819450557231903076171875,
        "lon": 30.21258329999999858728187973611056804656982421875
    },
    "last_point": {
        "ts": "2026-09-04T08:31:02+00:00",
        "lat": 59.8831050000000004729372449219226837158203125,
        "lon": 30.212360000000000326281224261038005352020263671875
    }
}

Methodology: 2026.01.18

Zone Dwell Ust-Luga/St. Petersburg Approach

Sep 4, 2026 01:15 UTC 80.0% ▼

Zone: Ust-Luga/St. Petersburg Approach
Duration: 5h 58m
Data Points: 8 AIS positions
Period: 2026-09-04T01:15:53+00:00 to 2026-09-04T07:14:44+00:00

Show Raw Evidence JSON

{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 358.8999999999999772626324556767940521240234375,
    "points_in_zone": 8,
    "first_point": {
        "ts": "2026-09-04T01:15:53+00:00",
        "lat": 59.88325830000000138397808768786489963531494140625,
        "lon": 30.212585000000000690079104970209300518035888671875
    },
    "last_point": {
        "ts": "2026-09-04T07:14:44+00:00",
        "lat": 59.88317669999999992569428286515176296234130859375,
        "lon": 30.21250500000000016598278307355940341949462890625
    }
}

Methodology: 2026.01.18

Zone Dwell Ust-Luga/St. Petersburg Approach

Sep 3, 2026 19:10 UTC 80.0% ▼

Zone: Ust-Luga/St. Petersburg Approach
Duration: 6h 29m
Data Points: 3 AIS positions
Period: 2026-09-03T19:35:43+00:00 to 2026-09-04T02:05:23+00:00

Show Raw Evidence JSON

{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 389.69999999999998863131622783839702606201171875,
    "points_in_zone": 3,
    "first_point": {
        "ts": "2026-09-03T19:35:43+00:00",
        "lat": 59.88321499999999986130205797962844371795654296875,
        "lon": 30.21254499999999865167410462163388729095458984375
    },
    "last_point": {
        "ts": "2026-09-04T02:05:23+00:00",
        "lat": 59.88323170000000317259036819450557231903076171875,
        "lon": 30.21258329999999858728187973611056804656982421875
    }
}

Methodology: 2026.01.18

Zone Dwell Ust-Luga/St. Petersburg Approach

Sep 3, 2026 18:09 UTC 80.0% ▼

Zone: Ust-Luga/St. Petersburg Approach
Duration: 6h 24m
Data Points: 5 AIS positions
Period: 2026-09-03T18:51:03+00:00 to 2026-09-04T01:15:53+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": 5,
    "first_point": {
        "ts": "2026-09-03T18:51:03+00:00",
        "lat": 59.88321669999999841138560441322624683380126953125,
        "lon": 30.212526700000001511625669081695377826690673828125
    },
    "last_point": {
        "ts": "2026-09-04T01:15:53+00:00",
        "lat": 59.88325830000000138397808768786489963531494140625,
        "lon": 30.212585000000000690079104970209300518035888671875
    }
}

Methodology: 2026.01.18

Zone Dwell Ust-Luga/St. Petersburg Approach

Sep 3, 2026 08:02 UTC 80.0% ▼

Zone: Ust-Luga/St. Petersburg Approach
Duration: 3h 23m
Data Points: 5 AIS positions
Period: 2026-09-03T08:02:46+00:00 to 2026-09-03T11:26:25+00:00

Show Raw Evidence JSON

{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 203.69999999999998863131622783839702606201171875,
    "points_in_zone": 5,
    "first_point": {
        "ts": "2026-09-03T08:02:46+00:00",
        "lat": 59.88332170000000331810952047817409038543701171875,
        "lon": 30.212450000000000471800376544706523418426513671875
    },
    "last_point": {
        "ts": "2026-09-03T11:26:25+00:00",
        "lat": 59.88321830000000289828676613979041576385498046875,
        "lon": 30.21259669999999886158548179082572460174560546875
    }
}

Methodology: 2026.01.18

Zone Dwell Ust-Luga/St. Petersburg Approach

Sep 3, 2026 07:11 UTC 80.0% ▼

Zone: Ust-Luga/St. Petersburg Approach
Duration: 4h 15m
Data Points: 7 AIS positions
Period: 2026-09-03T07:11:16+00:00 to 2026-09-03T11:26:25+00:00

Show Raw Evidence JSON

{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 255.19999999999998863131622783839702606201171875,
    "points_in_zone": 7,
    "first_point": {
        "ts": "2026-09-03T07:11:16+00:00",
        "lat": 59.880459999999999354258761741220951080322265625,
        "lon": 30.228815000000000878799255588091909885406494140625
    },
    "last_point": {
        "ts": "2026-09-03T11:26:25+00:00",
        "lat": 59.88321830000000289828676613979041576385498046875,
        "lon": 30.21259669999999886158548179082572460174560546875
    }
}

Methodology: 2026.01.18

Zone Dwell Ust-Luga/St. Petersburg Approach

Aug 31, 2026 10:25 UTC 80.0% ▼

Zone: Ust-Luga/St. Petersburg Approach
Duration: 1 hours
Data Points: 7 AIS positions
Period: 2026-08-31T10:25:44+00:00 to 2026-08-31T11:25:46+00:00

Show Raw Evidence JSON

{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 60,
    "points_in_zone": 7,
    "first_point": {
        "ts": "2026-08-31T10:25:44+00:00",
        "lat": 59.87673829999999952633515931665897369384765625,
        "lon": 30.2231799999999992678567650727927684783935546875
    },
    "last_point": {
        "ts": "2026-08-31T11:25:46+00:00",
        "lat": 59.8819333000000000311047188006341457366943359375,
        "lon": 30.211988300000001572698238305747509002685546875
    }
}

Methodology: 2026.01.18

Sts Ust-Luga/St. Petersburg Approach

Aug 31, 2026 10:17 UTC 58/100 ▼

Vessel A: MMSI 273353550 (EUROSTAR 4 MARIA) RUSSIA

Vessel B: IMO 8033089 (SGV FLOT) Russia

Minimum Distance: 285 meters
Average Distance: 322 meters
Duration: 43 minutes
Period: 2026-08-31T10:31:05+00:00 to 2026-08-31T11:14:34+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: 58/100

Low-confidence STS candidate - may warrant review. Two tankers (EUROSTAR 4 MARIA and SGV FLOT) maintained close proximity (min 285m, avg 322m) for 44 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

Factor	Score	Detail
Distance Tightness	15/25	Min distance 285m, avg 322m
Duration	5/25	Duration 44 minutes
Speed Stability	20/20	both nearly stationary; very stable speeds
Distance Consistency	8/15	Distance variance ±72m
Isolation	5/10	Isolation data not available
Context	5/5	In monitored zone: Ust-Luga/St. Petersburg Approach

Show Raw Evidence JSON

{
    "vessel_a": {
        "mmsi": 273353550,
        "name": "EUROSTAR 4 MARIA",
        "flag": "RUSSIA"
    },
    "vessel_b": {
        "mmsi": 273458830,
        "imo": 8033089,
        "name": "SGV FLOT",
        "flag": "Russia"
    },
    "min_distance_m": 284.69999999999998863131622783839702606201171875,
    "avg_distance_m": 321.6000000000000227373675443232059478759765625,
    "distance_consistency_m": 72.099999999999994315658113919198513031005859375,
    "duration_minutes": 43.5,
    "overlap_duration_s": 2609,
    "speed_a_avg": 0.2800000000000000266453525910037569701671600341796875,
    "speed_a_std": 0.2200000000000000011102230246251565404236316680908203125,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.2800000000000000266453525910037569701671600341796875,
            "max_sog": 0.5
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-08-31T10:31:05+00:00",
        "end": "2026-08-31T11:14:34+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": 58,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 285m, avg 322m"
            },
            "duration": {
                "score": 5,
                "max": 25,
                "detail": "Duration 44 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 8,
                "max": 15,
                "detail": "Distance variance \u00b172m"
            },
            "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 (EUROSTAR 4 MARIA and SGV FLOT) maintained close proximity (min 285m, avg 322m) for 44 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."
    }
}

Methodology: 2026.01.18

Sts🛰️✗ Ust-Luga/St. Petersburg Approach

Aug 31, 2026 06:13 UTC 82/100 ▼

Vessel A: MMSI 273353550 (EUROSTAR 4 MARIA) RUSSIA

Vessel B: IMO 8033089 (SGV FLOT) Russia

Minimum Distance: 280 meters
Average Distance: 300 meters
Duration: 5 hours
Period: 2026-08-31T06:13:45+00:00 to 2026-08-31T11:14:34+00:00
Vessel A Avg Speed: 0.4 knots
Vessel B Avg Speed: 0.0 knots
Zone: Ust-Luga/St. Petersburg Approach

Confidence Analysis

Score: 82/100

High-confidence STS candidate. Two tankers (EUROSTAR 4 MARIA and SGV FLOT) maintained close proximity (min 280m, avg 300m) for 301 minutes. Both vessels were slow-moving (avg speeds 0.4 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

Factor	Score	Detail
Distance Tightness	15/25	Min distance 280m, avg 300m
Duration	25/25	Duration 301 minutes
Speed Stability	20/20	both nearly stationary; very stable speeds
Distance Consistency	12/15	Distance variance ±49m
Isolation	5/10	Isolation data not available
Context	5/5	In monitored zone: Ust-Luga/St. Petersburg Approach

🛰️ Satellite Corroboration

✗ SAR Not Available

No satellite imagery for this time/location

No Sentinel-1 scenes covering AOI and time window

Searched: 2026-08-31T12:15:02.065609+00:00

Show Raw Evidence JSON

{
    "vessel_a": {
        "mmsi": 273353550,
        "name": "EUROSTAR 4 MARIA",
        "flag": "RUSSIA"
    },
    "vessel_b": {
        "mmsi": 273458830,
        "imo": 8033089,
        "name": "SGV FLOT",
        "flag": "Russia"
    },
    "min_distance_m": 280.19999999999998863131622783839702606201171875,
    "avg_distance_m": 300.30000000000001136868377216160297393798828125,
    "distance_consistency_m": 48.60000000000000142108547152020037174224853515625,
    "duration_minutes": 300.80000000000001136868377216160297393798828125,
    "overlap_duration_s": 18049,
    "speed_a_avg": 0.39000000000000001332267629550187848508358001708984375,
    "speed_a_std": 0.25,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.39000000000000001332267629550187848508358001708984375,
            "max_sog": 0.8000000000000000444089209850062616169452667236328125
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-08-31T06:13:45+00:00",
        "end": "2026-08-31T11:14:34+00:00"
    },
    "points_count": {
        "vessel_a": 9,
        "vessel_b": 9
    },
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "score": {
        "value": 82,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 280m, avg 300m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 301 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 12,
                "max": 15,
                "detail": "Distance variance \u00b149m"
            },
            "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 (EUROSTAR 4 MARIA and SGV FLOT) maintained close proximity (min 280m, avg 300m) for 301 minutes. Both vessels were slow-moving (avg speeds 0.4 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": "not_found",
        "centroid": {
            "lat": 59.87702949999999901820046943612396717071533203125,
            "lon": 30.220162800000000657973941997624933719635009765625
        },
        "time_window": {
            "start_ts": "2026-08-31T06:13:45+00:00",
            "end_ts": "2026-08-31T11:14:34+00:00"
        },
        "searched_at": "2026-08-31T12:15:02.065609+00:00",
        "notes": "No Sentinel-1 scenes covering AOI and time window"
    }
}

Methodology: 2026.01.18

Zone Dwell Ust-Luga/St. Petersburg Approach

Aug 31, 2026 06:13 UTC 80.0% ▼

Zone: Ust-Luga/St. Petersburg Approach
Duration: 5h 12m
Data Points: 11 AIS positions
Period: 2026-08-31T06:13:45+00:00 to 2026-08-31T11:25:46+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": 11,
    "first_point": {
        "ts": "2026-08-31T06:13:45+00:00",
        "lat": 59.876741699999996626502252183854579925537109375,
        "lon": 30.223178300000000717773218639194965362548828125
    },
    "last_point": {
        "ts": "2026-08-31T11:25:46+00:00",
        "lat": 59.8819333000000000311047188006341457366943359375,
        "lon": 30.211988300000001572698238305747509002685546875
    }
}

Methodology: 2026.01.18

Loiter Ust-Luga/St. Petersburg Approach

Aug 31, 2026 06:13 UTC 75.0% ▼

Duration: 5h 12m
Radius: 654 meters
Data Points: 11 AIS positions
Centroid: 59.8779, 30.2205
Zone: Ust-Luga/St. Petersburg Approach

Show Raw Evidence JSON

{
    "radius_m": 653.700000000000045474735088646411895751953125,
    "duration_minutes": 312,
    "points": 11,
    "centroid": {
        "lat": 59.877937736363634257941157557070255279541015625,
        "lon": 30.220536963636359217844074009917676448822021484375
    },
    "bbox": {
        "min_lat": 59.87673670000000214486135519109666347503662109375,
        "min_lon": 30.211988300000001572698238305747509002685546875,
        "max_lat": 59.8819333000000000311047188006341457366943359375,
        "max_lon": 30.223195000000000476347850053571164608001708984375
    },
    "zone_id": "russia_ust_luga_approach"
}

Methodology: 2026.01.18

Sts🛰️✗ Ust-Luga/St. Petersburg Approach

Aug 31, 2026 05:20 UTC 79/100 ▼

Vessel A: MMSI 273353550 (EUROSTAR 4 MARIA) RUSSIA

Vessel B: IMO 8033089 (SGV FLOT) Russia

Minimum Distance: 280 meters
Average Distance: 301 meters
Duration: 5h 54m
Period: 2026-08-31T05:20:05+00:00 to 2026-08-31T11:14:34+00:00
Vessel A Avg Speed: 0.4 knots
Vessel B Avg Speed: 0.0 knots
Zone: Ust-Luga/St. Petersburg Approach

Confidence Analysis

Score: 79/100

Moderate-confidence STS candidate. Two tankers (EUROSTAR 4 MARIA and SGV FLOT) maintained close proximity (min 280m, avg 301m) for 354 minutes. Both vessels were slow-moving (avg speeds 0.4 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

Factor	Score	Detail
Distance Tightness	15/25	Min distance 280m, avg 301m
Duration	25/25	Duration 354 minutes
Speed Stability	17/20	both nearly stationary; stable speeds
Distance Consistency	12/15	Distance variance ±39m
Isolation	5/10	Isolation data not available
Context	5/5	In monitored zone: Ust-Luga/St. Petersburg Approach

🛰️ Satellite Corroboration

✗ SAR Not Available

No satellite imagery for this time/location

No Sentinel-1 scenes covering AOI and time window

Searched: 2026-08-31T11:30:01.914111+00:00

Show Raw Evidence JSON

{
    "vessel_a": {
        "mmsi": 273353550,
        "name": "EUROSTAR 4 MARIA",
        "flag": "RUSSIA"
    },
    "vessel_b": {
        "mmsi": 273458830,
        "imo": 8033089,
        "name": "SGV FLOT",
        "flag": "Russia"
    },
    "min_distance_m": 280.19999999999998863131622783839702606201171875,
    "avg_distance_m": 300.69999999999998863131622783839702606201171875,
    "distance_consistency_m": 39.2999999999999971578290569595992565155029296875,
    "duration_minutes": 354.5,
    "overlap_duration_s": 21269,
    "speed_a_avg": 0.440000000000000002220446049250313080847263336181640625,
    "speed_a_std": 0.35999999999999998667732370449812151491641998291015625,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.440000000000000002220446049250313080847263336181640625,
            "max_sog": 1.399999999999999911182158029987476766109466552734375
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-08-31T05:20:05+00:00",
        "end": "2026-08-31T11:14:34+00:00"
    },
    "points_count": {
        "vessel_a": 16,
        "vessel_b": 16
    },
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "score": {
        "value": 79,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 280m, avg 301m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 354 minutes"
            },
            "speed_stability": {
                "score": 17,
                "max": 20,
                "detail": "both nearly stationary; stable speeds"
            },
            "distance_consistency": {
                "score": 12,
                "max": 15,
                "detail": "Distance variance \u00b139m"
            },
            "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 (EUROSTAR 4 MARIA and SGV FLOT) maintained close proximity (min 280m, avg 301m) for 354 minutes. Both vessels were slow-moving (avg speeds 0.4 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": "not_found",
        "centroid": {
            "lat": 59.8770130999999992127413861453533172607421875,
            "lon": 30.22040679999999923666109680198132991790771484375
        },
        "time_window": {
            "start_ts": "2026-08-31T05:20:05+00:00",
            "end_ts": "2026-08-31T11:14:34+00:00"
        },
        "searched_at": "2026-08-31T11:30:01.914111+00:00",
        "notes": "No Sentinel-1 scenes covering AOI and time window"
    }
}

Methodology: 2026.01.18

Zone Dwell Ust-Luga/St. Petersburg Approach

Aug 31, 2026 05:20 UTC 80.0% ▼

Zone: Ust-Luga/St. Petersburg Approach
Duration: 6h 5m
Data Points: 18 AIS positions
Period: 2026-08-31T05:20:05+00:00 to 2026-08-31T11:25:46+00:00

Show Raw Evidence JSON

{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 365.69999999999998863131622783839702606201171875,
    "points_in_zone": 18,
    "first_point": {
        "ts": "2026-08-31T05:20:05+00:00",
        "lat": 59.87671830000000028348949854262173175811767578125,
        "lon": 30.223189999999998889279595459811389446258544921875
    },
    "last_point": {
        "ts": "2026-08-31T11:25:46+00:00",
        "lat": 59.8819333000000000311047188006341457366943359375,
        "lon": 30.211988300000001572698238305747509002685546875
    }
}

Methodology: 2026.01.18

Loiter Ust-Luga/St. Petersburg Approach

Aug 31, 2026 05:20 UTC 75.0% ▼

Duration: 6h 5m
Radius: 723 meters
Data Points: 18 AIS positions
Centroid: 59.8776, 30.2216
Zone: Ust-Luga/St. Petersburg Approach

Show Raw Evidence JSON

{
    "radius_m": 723,
    "duration_minutes": 365.69999999999998863131622783839702606201171875,
    "points": 18,
    "centroid": {
        "lat": 59.87761601666667132803922868333756923675537109375,
        "lon": 30.221626572222223927610684768296778202056884765625
    },
    "bbox": {
        "min_lat": 59.876703300000002627712092362344264984130859375,
        "min_lon": 30.211988300000001572698238305747509002685546875,
        "max_lat": 59.8819333000000000311047188006341457366943359375,
        "max_lon": 30.223741700000001486614564782939851284027099609375
    },
    "zone_id": "russia_ust_luga_approach"
}

Methodology: 2026.01.18

Zone Dwell Ust-Luga/St. Petersburg Approach

Aug 31, 2026 04:39 UTC 80.0% ▼

Zone: Ust-Luga/St. Petersburg Approach
Duration: 6h 31m
Data Points: 18 AIS positions
Period: 2026-08-31T04:46:26+00:00 to 2026-08-31T11:18:05+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": 18,
    "first_point": {
        "ts": "2026-08-31T04:46:26+00:00",
        "lat": 59.8767466999999982135705067776143550872802734375,
        "lon": 30.22320330000000154768713400699198246002197265625
    },
    "last_point": {
        "ts": "2026-08-31T11:18:05+00:00",
        "lat": 59.88098500000000257159626926295459270477294921875,
        "lon": 30.213871699999998554631019942462444305419921875
    }
}

Methodology: 2026.01.18

Loiter Ust-Luga/St. Petersburg Approach

Aug 31, 2026 04:39 UTC 75.0% ▼

Duration: 6h 31m
Radius: 621 meters
Data Points: 18 AIS positions
Centroid: 59.8773, 30.2222
Zone: Ust-Luga/St. Petersburg Approach

Show Raw Evidence JSON

{
    "radius_m": 621.3999999999999772626324556767940521240234375,
    "duration_minutes": 391.6000000000000227373675443232059478759765625,
    "points": 18,
    "centroid": {
        "lat": 59.87732787222223151957223308272659778594970703125,
        "lon": 30.22224962777778500822023488581180572509765625
    },
    "bbox": {
        "min_lat": 59.876703300000002627712092362344264984130859375,
        "min_lon": 30.213871699999998554631019942462444305419921875,
        "max_lat": 59.88098500000000257159626926295459270477294921875,
        "max_lon": 30.223741700000001486614564782939851284027099609375
    },
    "zone_id": "russia_ust_luga_approach"
}

Methodology: 2026.01.18

Sts Ust-Luga/St. Petersburg Approach

Aug 31, 2026 04:34 UTC 82/100 ▼

Vessel A: MMSI 273353550 (EUROSTAR 4 MARIA) RUSSIA

Vessel B: IMO 8033089 (SGV FLOT) Russia

Minimum Distance: 280 meters
Average Distance: 293 meters
Duration: 5h 46m
Period: 2026-08-31T04:39:06+00:00 to 2026-08-31T10:25:44+00:00
Vessel A Avg Speed: 0.5 knots
Vessel B Avg Speed: 0.0 knots
Zone: Ust-Luga/St. Petersburg Approach

Confidence Analysis

Score: 82/100

High-confidence STS candidate. Two tankers (EUROSTAR 4 MARIA and SGV FLOT) maintained close proximity (min 280m, avg 293m) for 347 minutes. Both vessels were slow-moving (avg speeds 0.5 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

Factor	Score	Detail
Distance Tightness	15/25	Min distance 280m, avg 293m
Duration	25/25	Duration 347 minutes
Speed Stability	17/20	both nearly stationary; stable speeds
Distance Consistency	15/15	Distance variance ±20m
Isolation	5/10	Isolation data not available
Context	5/5	In monitored zone: Ust-Luga/St. Petersburg Approach

Show Raw Evidence JSON

{
    "vessel_a": {
        "mmsi": 273353550,
        "name": "EUROSTAR 4 MARIA",
        "flag": "RUSSIA"
    },
    "vessel_b": {
        "mmsi": 273458830,
        "imo": 8033089,
        "name": "SGV FLOT",
        "flag": "Russia"
    },
    "min_distance_m": 280.19999999999998863131622783839702606201171875,
    "avg_distance_m": 292.80000000000001136868377216160297393798828125,
    "distance_consistency_m": 20.300000000000000710542735760100185871124267578125,
    "duration_minutes": 346.6000000000000227373675443232059478759765625,
    "overlap_duration_s": 20798,
    "speed_a_avg": 0.4899999999999999911182158029987476766109466552734375,
    "speed_a_std": 0.38000000000000000444089209850062616169452667236328125,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.4899999999999999911182158029987476766109466552734375,
            "max_sog": 1.399999999999999911182158029987476766109466552734375
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-08-31T04:39:06+00:00",
        "end": "2026-08-31T10:25:44+00:00"
    },
    "points_count": {
        "vessel_a": 14,
        "vessel_b": 14
    },
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "score": {
        "value": 82,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 280m, avg 293m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 347 minutes"
            },
            "speed_stability": {
                "score": 17,
                "max": 20,
                "detail": "both nearly stationary; stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b120m"
            },
            "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 (EUROSTAR 4 MARIA and SGV FLOT) maintained close proximity (min 280m, avg 293m) for 347 minutes. Both vessels were slow-moving (avg speeds 0.5 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

Sts🛰️? Ust-Luga/St. Petersburg Approach

Aug 31, 2026 03:08 UTC 82/100 ▼

Vessel A: MMSI 273353550 (EUROSTAR 4 MARIA) RUSSIA

Vessel B: IMO 8033089 (SGV FLOT) Russia

Minimum Distance: 280 meters
Average Distance: 291 meters
Duration: 3h 48m
Period: 2026-08-31T03:09:27+00:00 to 2026-08-31T06:57:45+00:00
Vessel A Avg Speed: 0.4 knots
Vessel B Avg Speed: 0.0 knots
Zone: Ust-Luga/St. Petersburg Approach

Confidence Analysis

Score: 82/100

High-confidence STS candidate. Two tankers (EUROSTAR 4 MARIA and SGV FLOT) maintained close proximity (min 280m, avg 291m) for 228 minutes. Both vessels were slow-moving (avg speeds 0.4 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

Factor	Score	Detail
Distance Tightness	15/25	Min distance 280m, avg 291m
Duration	25/25	Duration 228 minutes
Speed Stability	17/20	both nearly stationary; stable speeds
Distance Consistency	15/15	Distance variance ±18m
Isolation	5/10	Isolation data not available
Context	5/5	In 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

Click image to view full size

Searched: 2026-08-31T09:45:02.153779+00:00

{
    "vessel_a": {
        "mmsi": 273353550,
        "name": "EUROSTAR 4 MARIA",
        "flag": "RUSSIA"
    },
    "vessel_b": {
        "mmsi": 273458830,
        "imo": 8033089,
        "name": "SGV FLOT",
        "flag": "Russia"
    },
    "min_distance_m": 280.19999999999998863131622783839702606201171875,
    "avg_distance_m": 290.69999999999998863131622783839702606201171875,
    "distance_consistency_m": 17.699999999999999289457264239899814128875732421875,
    "duration_minutes": 228.30000000000001136868377216160297393798828125,
    "overlap_duration_s": 13698,
    "speed_a_avg": 0.440000000000000002220446049250313080847263336181640625,
    "speed_a_std": 0.35999999999999998667732370449812151491641998291015625,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.440000000000000002220446049250313080847263336181640625,
            "max_sog": 1.399999999999999911182158029987476766109466552734375
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-08-31T03:09:27+00:00",
        "end": "2026-08-31T06:57:45+00:00"
    },
    "points_count": {
        "vessel_a": 19,
        "vessel_b": 19
    },
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "score": {
        "value": 82,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 280m, avg 291m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 228 minutes"
            },
            "speed_stability": {
                "score": 17,
                "max": 20,
                "detail": "both nearly stationary; stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b118m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Ust-Luga\/St. Petersburg Approach"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (EUROSTAR 4 MARIA and SGV FLOT) maintained close proximity (min 280m, avg 291m) for 228 minutes. Both vessels were slow-moving (avg speeds 0.4 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": 59.87680879999999916663000476546585559844970703125,
            "lon": 30.220630499999998619387042708694934844970703125
        },
        "time_window": {
            "start_ts": "2026-08-31T03:08:04+00:00",
            "end_ts": "2026-08-31T06:57:45+00:00"
        },
        "searched_at": "2026-08-31T09:45:02.153779+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_1173526_thumbnail_20260831094507.png",
            "stored_path": "\/home\/fleetleaks\/public_html\/wp-content\/uploads\/fleetleaks-evidence\/sar-imagery\/2026\/08\/event_1173526_thumbnail_20260831094507.png",
            "source": "copernicus_dataspace"
        },
        "notes": "Preview available for manual review"
    }
}

Aug 31, 2026 03:03 UTC 80.0% ▼

Zone: Ust-Luga/St. Petersburg Approach
Duration: 6h 35m
Data Points: 15 AIS positions
Period: 2026-08-31T03:50:16+00:00 to 2026-08-31T10:25:44+00:00

{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 395.5,
    "points_in_zone": 15,
    "first_point": {
        "ts": "2026-08-31T03:50:16+00:00",
        "lat": 59.87673829999999952633515931665897369384765625,
        "lon": 30.223208299999999582041709800250828266143798828125
    },
    "last_point": {
        "ts": "2026-08-31T10:25:44+00:00",
        "lat": 59.87673829999999952633515931665897369384765625,
        "lon": 30.2231799999999992678567650727927684783935546875
    }
}

Aug 31, 2026 03:03 UTC 75.0% ▼

Duration: 6h 35m
Radius: 138 meters
Data Points: 15 AIS positions
Centroid: 59.8769, 30.2233
Zone: Ust-Luga/St. Petersburg Approach

{
    "radius_m": 138,
    "duration_minutes": 395.5,
    "points": 15,
    "centroid": {
        "lat": 59.8769192200000048842412070371210575103759765625,
        "lon": 30.22325210666667061332191224209964275360107421875
    },
    "bbox": {
        "min_lat": 59.876703300000002627712092362344264984130859375,
        "min_lon": 30.223093299999998606608642148785293102264404296875,
        "max_lat": 59.87813330000000178188201971352100372314453125,
        "max_lon": 30.223741700000001486614564782939851284027099609375
    },
    "zone_id": "russia_ust_luga_approach"
}

Aug 31, 2026 02:09 UTC 80.0% ▼

Zone: Ust-Luga/St. Petersburg Approach
Duration: 4h 47m
Data Points: 27 AIS positions
Period: 2026-08-31T02:09:56+00:00 to 2026-08-31T06:57:45+00:00

{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 287.80000000000001136868377216160297393798828125,
    "points_in_zone": 27,
    "first_point": {
        "ts": "2026-08-31T02:09:56+00:00",
        "lat": 59.8767332999999979392669047228991985321044921875,
        "lon": 30.223156700000000540740074939094483852386474609375
    },
    "last_point": {
        "ts": "2026-08-31T06:57:45+00:00",
        "lat": 59.876761700000002974775270558893680572509765625,
        "lon": 30.22316670000000016216290532611310482025146484375
    }
}

Aug 31, 2026 02:09 UTC 75.0% ▼

Duration: 4h 47m
Radius: 147 meters
Data Points: 27 AIS positions
Centroid: 59.8768, 30.2232
Zone: Ust-Luga/St. Petersburg Approach

{
    "radius_m": 147.30000000000001136868377216160297393798828125,
    "duration_minutes": 287.80000000000001136868377216160297393798828125,
    "points": 27,
    "centroid": {
        "lat": 59.87683765555555481796545791439712047576904296875,
        "lon": 30.2232150592592603288721875287592411041259765625
    },
    "bbox": {
        "min_lat": 59.87668169999999889796526986174285411834716796875,
        "min_lon": 30.223093299999998606608642148785293102264404296875,
        "max_lat": 59.87813330000000178188201971352100372314453125,
        "max_lon": 30.223741700000001486614564782939851284027099609375
    },
    "zone_id": "russia_ust_luga_approach"
}

Aug 31, 2026 02:01 UTC 82/100 ▼

Vessel A: MMSI 273353550 (EUROSTAR 4 MARIA) RUSSIA

Vessel B: IMO 8033089 (SGV FLOT) Russia

Minimum Distance: 280 meters
Average Distance: 290 meters
Duration: 4h 13m
Period: 2026-08-31T02:44:46+00:00 to 2026-08-31T06:57:45+00:00
Vessel A Avg Speed: 0.4 knots
Vessel B Avg Speed: 0.0 knots
Zone: Ust-Luga/St. Petersburg Approach

Confidence Analysis

Score: 82/100

High-confidence STS candidate. Two tankers (EUROSTAR 4 MARIA and SGV FLOT) maintained close proximity (min 280m, avg 290m) for 253 minutes. Both vessels were slow-moving (avg speeds 0.4 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

Factor	Score	Detail
Distance Tightness	15/25	Min distance 280m, avg 290m
Duration	25/25	Duration 253 minutes
Speed Stability	17/20	both nearly stationary; stable speeds
Distance Consistency	15/15	Distance variance ±17m
Isolation	5/10	Isolation data not available
Context	5/5	In monitored zone: Ust-Luga/St. Petersburg Approach

Show Raw Evidence JSON

{
    "vessel_a": {
        "mmsi": 273353550,
        "name": "EUROSTAR 4 MARIA",
        "flag": "RUSSIA"
    },
    "vessel_b": {
        "mmsi": 273458830,
        "imo": 8033089,
        "name": "SGV FLOT",
        "flag": "Russia"
    },
    "min_distance_m": 280.19999999999998863131622783839702606201171875,
    "avg_distance_m": 290.30000000000001136868377216160297393798828125,
    "distance_consistency_m": 16.800000000000000710542735760100185871124267578125,
    "duration_minutes": 253,
    "overlap_duration_s": 15179,
    "speed_a_avg": 0.429999999999999993338661852249060757458209991455078125,
    "speed_a_std": 0.34999999999999997779553950749686919152736663818359375,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.429999999999999993338661852249060757458209991455078125,
            "max_sog": 1.399999999999999911182158029987476766109466552734375
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-08-31T02:44:46+00:00",
        "end": "2026-08-31T06:57:45+00:00"
    },
    "points_count": {
        "vessel_a": 21,
        "vessel_b": 21
    },
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "score": {
        "value": 82,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 280m, avg 290m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 253 minutes"
            },
            "speed_stability": {
                "score": 17,
                "max": 20,
                "detail": "both nearly stationary; stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b117m"
            },
            "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 (EUROSTAR 4 MARIA and SGV FLOT) maintained close proximity (min 280m, avg 290m) for 253 minutes. Both vessels were slow-moving (avg speeds 0.4 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

Sts🛰️? Ust-Luga/St. Petersburg Approach

Aug 31, 2026 01:19 UTC 82/100 ▼

Vessel A: MMSI 273353550 (EUROSTAR 4 MARIA) RUSSIA

Vessel B: IMO 8033089 (SGV FLOT) Russia

Minimum Distance: 280 meters
Average Distance: 289 meters
Duration: 4h 57m
Period: 2026-08-31T01:19:47+00:00 to 2026-08-31T06:16:55+00:00
Vessel A Avg Speed: 0.4 knots
Vessel B Avg Speed: 0.0 knots
Zone: Ust-Luga/St. Petersburg Approach

Confidence Analysis

Score: 82/100

High-confidence STS candidate. Two tankers (EUROSTAR 4 MARIA and SGV FLOT) maintained close proximity (min 280m, avg 289m) for 297 minutes. Both vessels were slow-moving (avg speeds 0.4 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

Factor	Score	Detail
Distance Tightness	15/25	Min distance 280m, avg 289m
Duration	25/25	Duration 297 minutes
Speed Stability	17/20	both nearly stationary; stable speeds
Distance Consistency	15/15	Distance variance ±15m
Isolation	5/10	Isolation data not available
Context	5/5	In 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

Click image to view full size

Searched: 2026-08-31T06:45:07.427357+00:00

{
    "vessel_a": {
        "mmsi": 273353550,
        "name": "EUROSTAR 4 MARIA",
        "flag": "RUSSIA"
    },
    "vessel_b": {
        "mmsi": 273458830,
        "imo": 8033089,
        "name": "SGV FLOT",
        "flag": "Russia"
    },
    "min_distance_m": 280.19999999999998863131622783839702606201171875,
    "avg_distance_m": 288.8999999999999772626324556767940521240234375,
    "distance_consistency_m": 15,
    "duration_minutes": 297.1000000000000227373675443232059478759765625,
    "overlap_duration_s": 17828,
    "speed_a_avg": 0.429999999999999993338661852249060757458209991455078125,
    "speed_a_std": 0.34999999999999997779553950749686919152736663818359375,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.429999999999999993338661852249060757458209991455078125,
            "max_sog": 1.399999999999999911182158029987476766109466552734375
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-08-31T01:19:47+00:00",
        "end": "2026-08-31T06:16:55+00:00"
    },
    "points_count": {
        "vessel_a": 27,
        "vessel_b": 27
    },
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "score": {
        "value": 82,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 280m, avg 289m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 297 minutes"
            },
            "speed_stability": {
                "score": 17,
                "max": 20,
                "detail": "both nearly stationary; stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b115m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Ust-Luga\/St. Petersburg Approach"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (EUROSTAR 4 MARIA and SGV FLOT) maintained close proximity (min 280m, avg 289m) for 297 minutes. Both vessels were slow-moving (avg speeds 0.4 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": 59.87686370000000124491634778678417205810546875,
            "lon": 30.220657599999999121109794941730797290802001953125
        },
        "time_window": {
            "start_ts": "2026-08-31T01:19:47+00:00",
            "end_ts": "2026-08-31T06:16:55+00:00"
        },
        "searched_at": "2026-08-31T06:45:07.427357+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_1172884_thumbnail_20260831064511.png",
            "stored_path": "\/home\/fleetleaks\/public_html\/wp-content\/uploads\/fleetleaks-evidence\/sar-imagery\/2026\/08\/event_1172884_thumbnail_20260831064511.png",
            "source": "copernicus_dataspace"
        },
        "notes": "Preview available for manual review"
    }
}

Aug 31, 2026 01:19 UTC 80.0% ▼

Zone: Ust-Luga/St. Petersburg Approach
Duration: 5h 38m
Data Points: 29 AIS positions
Period: 2026-08-31T01:19:47+00:00 to 2026-08-31T06:57:45+00:00

{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 338,
    "points_in_zone": 29,
    "first_point": {
        "ts": "2026-08-31T01:19:47+00:00",
        "lat": 59.87673000000000200770955416373908519744873046875,
        "lon": 30.22316500000000161207935889251530170440673828125
    },
    "last_point": {
        "ts": "2026-08-31T06:57:45+00:00",
        "lat": 59.876761700000002974775270558893680572509765625,
        "lon": 30.22316670000000016216290532611310482025146484375
    }
}

Aug 31, 2026 01:19 UTC 75.0% ▼

Duration: 5h 38m
Radius: 148 meters
Data Points: 29 AIS positions
Centroid: 59.8768, 30.2232
Zone: Ust-Luga/St. Petersburg Approach

{
    "radius_m": 148,
    "duration_minutes": 338,
    "points": 29,
    "centroid": {
        "lat": 59.87683161034481571505239116959273815155029296875,
        "lon": 30.2232111482758654119606944732367992401123046875
    },
    "bbox": {
        "min_lat": 59.87668169999999889796526986174285411834716796875,
        "min_lon": 30.223093299999998606608642148785293102264404296875,
        "max_lat": 59.87813330000000178188201971352100372314453125,
        "max_lon": 30.223741700000001486614564782939851284027099609375
    },
    "zone_id": "russia_ust_luga_approach"
}

Aug 31, 2026 00:02 UTC 80.0% ▼

Zone: Ust-Luga/St. Petersburg Approach
Duration: 6h 14m
Data Points: 28 AIS positions
Period: 2026-08-31T00:02:47+00:00 to 2026-08-31T06:16:55+00:00

{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 374.1000000000000227373675443232059478759765625,
    "points_in_zone": 28,
    "first_point": {
        "ts": "2026-08-31T00:02:47+00:00",
        "lat": 59.87673170000000055779310059733688831329345703125,
        "lon": 30.223189999999998889279595459811389446258544921875
    },
    "last_point": {
        "ts": "2026-08-31T06:16:55+00:00",
        "lat": 59.8767399999999980764187057502567768096923828125,
        "lon": 30.223093299999998606608642148785293102264404296875
    }
}

Aug 31, 2026 00:02 UTC 75.0% ▼

Duration: 6h 14m
Radius: 148 meters
Data Points: 28 AIS positions
Centroid: 59.8768, 30.2232
Zone: Ust-Luga/St. Petersburg Approach

{
    "radius_m": 148,
    "duration_minutes": 374.1000000000000227373675443232059478759765625,
    "points": 28,
    "centroid": {
        "lat": 59.87683178571427333736210130155086517333984375,
        "lon": 30.223213689285710614740310120396316051483154296875
    },
    "bbox": {
        "min_lat": 59.87668169999999889796526986174285411834716796875,
        "min_lon": 30.223093299999998606608642148785293102264404296875,
        "max_lat": 59.87813330000000178188201971352100372314453125,
        "max_lon": 30.223741700000001486614564782939851284027099609375
    },
    "zone_id": "russia_ust_luga_approach"
}

Aug 30, 2026 22:13 UTC 85/100 ▼

Vessel A: MMSI 273353550 (EUROSTAR 4 MARIA) RUSSIA

Vessel B: IMO 8033089 (SGV FLOT) Russia

Minimum Distance: 281 meters
Average Distance: 285 meters
Duration: 5h 36m
Period: 2026-08-30T22:13:29+00:00 to 2026-08-31T03:50:16+00:00
Vessel A Avg Speed: 0.4 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 (EUROSTAR 4 MARIA and SGV FLOT) maintained close proximity (min 281m, avg 285m) for 337 minutes. Both vessels were slow-moving (avg speeds 0.4 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

Factor	Score	Detail
Distance Tightness	15/25	Min distance 281m, avg 285m
Duration	25/25	Duration 337 minutes
Speed Stability	20/20	both nearly stationary; very stable speeds
Distance Consistency	15/15	Distance variance ±2m
Isolation	5/10	Isolation data not available
Context	5/5	In 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

Click image to view full size

Searched: 2026-08-31T04:45:01.471935+00:00

{
    "vessel_a": {
        "mmsi": 273353550,
        "name": "EUROSTAR 4 MARIA",
        "flag": "RUSSIA"
    },
    "vessel_b": {
        "mmsi": 273458830,
        "imo": 8033089,
        "name": "SGV FLOT",
        "flag": "Russia"
    },
    "min_distance_m": 281.19999999999998863131622783839702606201171875,
    "avg_distance_m": 284.69999999999998863131622783839702606201171875,
    "distance_consistency_m": 1.6999999999999999555910790149937383830547332763671875,
    "duration_minutes": 336.80000000000001136868377216160297393798828125,
    "overlap_duration_s": 20207,
    "speed_a_avg": 0.35999999999999998667732370449812151491641998291015625,
    "speed_a_std": 0.2600000000000000088817841970012523233890533447265625,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.35999999999999998667732370449812151491641998291015625,
            "max_sog": 1.100000000000000088817841970012523233890533447265625
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-08-30T22:13:29+00:00",
        "end": "2026-08-31T03:50:16+00:00"
    },
    "points_count": {
        "vessel_a": 19,
        "vessel_b": 19
    },
    "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 281m, avg 285m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 337 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b12m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Ust-Luga\/St. Petersburg Approach"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (EUROSTAR 4 MARIA and SGV FLOT) maintained close proximity (min 281m, avg 285m) for 337 minutes. Both vessels were slow-moving (avg speeds 0.4 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": 59.87681719999999785386535222642123699188232421875,
            "lon": 30.22063440000000156260284711606800556182861328125
        },
        "time_window": {
            "start_ts": "2026-08-30T22:13:29+00:00",
            "end_ts": "2026-08-31T03:50:16+00:00"
        },
        "searched_at": "2026-08-31T04:45:01.471935+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_1172197_thumbnail_20260831044505.png",
            "stored_path": "\/home\/fleetleaks\/public_html\/wp-content\/uploads\/fleetleaks-evidence\/sar-imagery\/2026\/08\/event_1172197_thumbnail_20260831044505.png",
            "source": "copernicus_dataspace"
        },
        "notes": "Preview available for manual review"
    }
}

Aug 30, 2026 22:13 UTC 80.0% ▼

Zone: Ust-Luga/St. Petersburg Approach
Duration: 6h 32m
Data Points: 21 AIS positions
Period: 2026-08-30T22:13:29+00:00 to 2026-08-31T04:46:26+00:00

{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 392.8999999999999772626324556767940521240234375,
    "points_in_zone": 21,
    "first_point": {
        "ts": "2026-08-30T22:13:29+00:00",
        "lat": 59.876755000000002837623469531536102294921875,
        "lon": 30.2231732999999991307049640454351902008056640625
    },
    "last_point": {
        "ts": "2026-08-31T04:46:26+00:00",
        "lat": 59.8767466999999982135705067776143550872802734375,
        "lon": 30.22320330000000154768713400699198246002197265625
    }
}

Aug 30, 2026 22:13 UTC 75.0% ▼

Duration: 6h 32m
Radius: 6 meters
Data Points: 21 AIS positions
Centroid: 59.8767, 30.2232
Zone: Ust-Luga/St. Petersburg Approach

{
    "radius_m": 6.4000000000000003552713678800500929355621337890625,
    "duration_minutes": 392.8999999999999772626324556767940521240234375,
    "points": 21,
    "centroid": {
        "lat": 59.87673905238096239145306753925979137420654296875,
        "lon": 30.22317436190476058754939003847539424896240234375
    },
    "bbox": {
        "min_lat": 59.87668169999999889796526986174285411834716796875,
        "min_lon": 30.22309500000000070940586738288402557373046875,
        "max_lat": 59.87677000000000049340087571181356906890869140625,
        "max_lon": 30.223233300000000411955625168047845363616943359375
    },
    "zone_id": "russia_ust_luga_approach"
}

Aug 30, 2026 21:51 UTC 80.0% ▼

Zone: Ust-Luga/St. Petersburg Approach
Duration: 5h 58m
Data Points: 20 AIS positions
Period: 2026-08-30T21:51:48+00:00 to 2026-08-31T03:50:16+00:00

{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 358.5,
    "points_in_zone": 20,
    "first_point": {
        "ts": "2026-08-30T21:51:48+00:00",
        "lat": 59.87671999999999883357304497621953487396240234375,
        "lon": 30.22320500000000009777068044058978557586669921875
    },
    "last_point": {
        "ts": "2026-08-31T03:50:16+00:00",
        "lat": 59.87673829999999952633515931665897369384765625,
        "lon": 30.223208299999999582041709800250828266143798828125
    }
}

Aug 30, 2026 21:51 UTC 75.0% ▼

Duration: 5h 58m
Radius: 6 meters
Data Points: 20 AIS positions
Centroid: 59.8767, 30.2232
Zone: Ust-Luga/St. Petersburg Approach

{
    "radius_m": 6.20000000000000017763568394002504646778106689453125,
    "duration_minutes": 358.5,
    "points": 20,
    "centroid": {
        "lat": 59.87673708500000202548108063638210296630859375,
        "lon": 30.223172330000000584959707339294254779815673828125
    },
    "bbox": {
        "min_lat": 59.87668169999999889796526986174285411834716796875,
        "min_lon": 30.22309500000000070940586738288402557373046875,
        "max_lat": 59.87677000000000049340087571181356906890869140625,
        "max_lon": 30.223233300000000411955625168047845363616943359375
    },
    "zone_id": "russia_ust_luga_approach"
}

Aug 30, 2026 21:45 UTC 85/100 ▼

Vessel A: MMSI 273353550 (EUROSTAR 4 MARIA) RUSSIA

Vessel B: IMO 8033089 (SGV FLOT) Russia

Minimum Distance: 281 meters
Average Distance: 284 meters
Duration: 4h 53m
Period: 2026-08-30T21:51:48+00:00 to 2026-08-31T02:44:46+00:00
Vessel A Avg Speed: 0.4 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 (EUROSTAR 4 MARIA and SGV FLOT) maintained close proximity (min 281m, avg 284m) for 293 minutes. Both vessels were slow-moving (avg speeds 0.4 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

Factor	Score	Detail
Distance Tightness	15/25	Min distance 281m, avg 284m
Duration	25/25	Duration 293 minutes
Speed Stability	20/20	both nearly stationary; very stable speeds
Distance Consistency	15/15	Distance variance ±2m
Isolation	5/10	Isolation data not available
Context	5/5	In monitored zone: Ust-Luga/St. Petersburg Approach

Show Raw Evidence JSON

{
    "vessel_a": {
        "mmsi": 273353550,
        "name": "EUROSTAR 4 MARIA",
        "flag": "RUSSIA"
    },
    "vessel_b": {
        "mmsi": 273458830,
        "imo": 8033089,
        "name": "SGV FLOT",
        "flag": "Russia"
    },
    "min_distance_m": 281.19999999999998863131622783839702606201171875,
    "avg_distance_m": 284.3999999999999772626324556767940521240234375,
    "distance_consistency_m": 1.6999999999999999555910790149937383830547332763671875,
    "duration_minutes": 293,
    "overlap_duration_s": 17578,
    "speed_a_avg": 0.38000000000000000444089209850062616169452667236328125,
    "speed_a_std": 0.270000000000000017763568394002504646778106689453125,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.38000000000000000444089209850062616169452667236328125,
            "max_sog": 1.100000000000000088817841970012523233890533447265625
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-08-30T21:51:48+00:00",
        "end": "2026-08-31T02:44:46+00:00"
    },
    "points_count": {
        "vessel_a": 13,
        "vessel_b": 13
    },
    "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 281m, avg 284m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 293 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b12m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Ust-Luga\/St. Petersburg Approach"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (EUROSTAR 4 MARIA and SGV FLOT) maintained close proximity (min 281m, avg 284m) for 293 minutes. Both vessels were slow-moving (avg speeds 0.4 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 30, 2026 20:06 UTC 80.0% ▼

Zone: Ust-Luga/St. Petersburg Approach
Duration: 6h 32m
Data Points: 15 AIS positions
Period: 2026-08-30T20:12:27+00:00 to 2026-08-31T02:44:46+00:00

Show Raw Evidence JSON

{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 392.30000000000001136868377216160297393798828125,
    "points_in_zone": 15,
    "first_point": {
        "ts": "2026-08-30T20:12:27+00:00",
        "lat": 59.87670829999999710935298935510218143463134765625,
        "lon": 30.223183299999998752127794432453811168670654296875
    },
    "last_point": {
        "ts": "2026-08-31T02:44:46+00:00",
        "lat": 59.8767433000000011134034139104187488555908203125,
        "lon": 30.223178300000000717773218639194965362548828125
    }
}

Methodology: 2026.01.18

Loiter Ust-Luga/St. Petersburg Approach

Aug 30, 2026 20:06 UTC 75.0% ▼

Duration: 6h 32m
Radius: 5 meters
Data Points: 15 AIS positions
Centroid: 59.8767, 30.2232
Zone: Ust-Luga/St. Petersburg Approach

Show Raw Evidence JSON

{
    "radius_m": 4.70000000000000017763568394002504646778106689453125,
    "duration_minutes": 392.30000000000001136868377216160297393798828125,
    "points": 15,
    "centroid": {
        "lat": 59.87673755333333502903769840486347675323486328125,
        "lon": 30.223173993333329434562983806245028972625732421875
    },
    "bbox": {
        "min_lat": 59.87670829999999710935298935510218143463134765625,
        "min_lon": 30.22309500000000070940586738288402557373046875,
        "max_lat": 59.87677000000000049340087571181356906890869140625,
        "max_lon": 30.223223300000000790532794781029224395751953125
    },
    "zone_id": "russia_ust_luga_approach"
}

Methodology: 2026.01.18

Sts Ust-Luga/St. Petersburg Approach

Aug 30, 2026 19:04 UTC 85/100 ▼

Vessel A: MMSI 273353550 (EUROSTAR 4 MARIA) RUSSIA

Vessel B: IMO 8033089 (SGV FLOT) Russia

Minimum Distance: 283 meters
Average Distance: 286 meters
Duration: 6h 17m
Period: 2026-08-30T19:07:18+00:00 to 2026-08-31T01:25:06+00:00
Vessel A Avg Speed: 0.4 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 (EUROSTAR 4 MARIA and SGV FLOT) maintained close proximity (min 283m, avg 286m) for 378 minutes. Both vessels were slow-moving (avg speeds 0.3 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

Factor	Score	Detail
Distance Tightness	15/25	Min distance 283m, avg 286m
Duration	25/25	Duration 378 minutes
Speed Stability	20/20	both nearly stationary; very stable speeds
Distance Consistency	15/15	Distance variance ±2m
Isolation	5/10	Isolation data not available
Context	5/5	In monitored zone: Ust-Luga/St. Petersburg Approach

Show Raw Evidence JSON

{
    "vessel_a": {
        "mmsi": 273353550,
        "name": "EUROSTAR 4 MARIA",
        "flag": "RUSSIA"
    },
    "vessel_b": {
        "mmsi": 273458830,
        "imo": 8033089,
        "name": "SGV FLOT",
        "flag": "Russia"
    },
    "min_distance_m": 283,
    "avg_distance_m": 286.3999999999999772626324556767940521240234375,
    "distance_consistency_m": 2.20000000000000017763568394002504646778106689453125,
    "duration_minutes": 377.80000000000001136868377216160297393798828125,
    "overlap_duration_s": 22668,
    "speed_a_avg": 0.34999999999999997779553950749686919152736663818359375,
    "speed_a_std": 0.200000000000000011102230246251565404236316680908203125,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.34999999999999997779553950749686919152736663818359375,
            "max_sog": 0.59999999999999997779553950749686919152736663818359375
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-08-30T19:07:18+00:00",
        "end": "2026-08-31T01:25:06+00:00"
    },
    "points_count": {
        "vessel_a": 15,
        "vessel_b": 15
    },
    "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 283m, avg 286m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 378 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b12m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Ust-Luga\/St. Petersburg Approach"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (EUROSTAR 4 MARIA and SGV FLOT) maintained close proximity (min 283m, avg 286m) for 378 minutes. Both vessels were slow-moving (avg speeds 0.3 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 30, 2026 19:01 UTC 80.0% ▼

Zone: Ust-Luga/St. Petersburg Approach
Duration: 6h 31m
Data Points: 16 AIS positions
Period: 2026-08-30T19:52:38+00:00 to 2026-08-31T02:23:36+00:00

Show Raw Evidence JSON

{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 391,
    "points_in_zone": 16,
    "first_point": {
        "ts": "2026-08-30T19:52:38+00:00",
        "lat": 59.8767332999999979392669047228991985321044921875,
        "lon": 30.223191700000000992076820693910121917724609375
    },
    "last_point": {
        "ts": "2026-08-31T02:23:36+00:00",
        "lat": 59.87672669999999897072484600357711315155029296875,
        "lon": 30.2231866999999994050085661001503467559814453125
    }
}

Methodology: 2026.01.18

Loiter Ust-Luga/St. Petersburg Approach

Aug 30, 2026 19:01 UTC 75.0% ▼

Duration: 6h 31m
Radius: 5 meters
Data Points: 16 AIS positions
Centroid: 59.8767, 30.2232
Zone: Ust-Luga/St. Petersburg Approach

Show Raw Evidence JSON

{
    "radius_m": 4.70000000000000017763568394002504646778106689453125,
    "duration_minutes": 391,
    "points": 16,
    "centroid": {
        "lat": 59.8767390624999933379513095133006572723388671875,
        "lon": 30.2231745874999973011654219590127468109130859375
    },
    "bbox": {
        "min_lat": 59.87670829999999710935298935510218143463134765625,
        "min_lon": 30.22309500000000070940586738288402557373046875,
        "max_lat": 59.87677000000000049340087571181356906890869140625,
        "max_lon": 30.223223300000000790532794781029224395751953125
    },
    "zone_id": "russia_ust_luga_approach"
}

Methodology: 2026.01.18

Zone Dwell Ust-Luga/St. Petersburg Approach

Aug 30, 2026 18:58 UTC 80.0% ▼

Zone: Ust-Luga/St. Petersburg Approach
Duration: 6h 26m
Data Points: 17 AIS positions
Period: 2026-08-30T18:58:38+00:00 to 2026-08-31T01:25:06+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": 17,
    "first_point": {
        "ts": "2026-08-30T18:58:38+00:00",
        "lat": 59.87677999999999656211002729833126068115234375,
        "lon": 30.2231799999999992678567650727927684783935546875
    },
    "last_point": {
        "ts": "2026-08-31T01:25:06+00:00",
        "lat": 59.87677000000000049340087571181356906890869140625,
        "lon": 30.223151699999998953671820345334708690643310546875
    }
}

Methodology: 2026.01.18

Loiter Ust-Luga/St. Petersburg Approach

Aug 30, 2026 18:58 UTC 75.0% ▼

Duration: 6h 26m
Radius: 8 meters
Data Points: 17 AIS positions
Centroid: 59.8767, 30.2232
Zone: Ust-Luga/St. Petersburg Approach

Show Raw Evidence JSON

{
    "radius_m": 7.70000000000000017763568394002504646778106689453125,
    "duration_minutes": 386.5,
    "points": 17,
    "centroid": {
        "lat": 59.8767464705882304087936063297092914581298828125,
        "lon": 30.2231836294117641728007583878934383392333984375
    },
    "bbox": {
        "min_lat": 59.87670829999999710935298935510218143463134765625,
        "min_lon": 30.22312170000000008940332918427884578704833984375,
        "max_lat": 59.876806700000003047534846700727939605712890625,
        "max_lon": 30.22325169999999872061380301602184772491455078125
    },
    "zone_id": "russia_ust_luga_approach"
}

Methodology: 2026.01.18

Sts Ust-Luga/St. Petersburg Approach

Aug 30, 2026 18:52 UTC 85/100 ▼

Vessel A: MMSI 273353550 (EUROSTAR 4 MARIA) RUSSIA

Vessel B: IMO 8033089 (SGV FLOT) Russia

Minimum Distance: 283 meters
Average Distance: 287 meters
Duration: 3h 20m
Period: 2026-08-30T18:58:38+00:00 to 2026-08-30T22:19:29+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: 85/100

High-confidence STS candidate. Two tankers (EUROSTAR 4 MARIA and SGV FLOT) maintained close proximity (min 283m, avg 287m) for 201 minutes. Both vessels were slow-moving (avg speeds 0.3 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

Factor	Score	Detail
Distance Tightness	15/25	Min distance 283m, avg 287m
Duration	25/25	Duration 201 minutes
Speed Stability	20/20	both nearly stationary; very stable speeds
Distance Consistency	15/15	Distance variance ±2m
Isolation	5/10	Isolation data not available
Context	5/5	In monitored zone: Ust-Luga/St. Petersburg Approach

Show Raw Evidence JSON

{
    "vessel_a": {
        "mmsi": 273353550,
        "name": "EUROSTAR 4 MARIA",
        "flag": "RUSSIA"
    },
    "vessel_b": {
        "mmsi": 273458830,
        "imo": 8033089,
        "name": "SGV FLOT",
        "flag": "Russia"
    },
    "min_distance_m": 283,
    "avg_distance_m": 286.80000000000001136868377216160297393798828125,
    "distance_consistency_m": 2,
    "duration_minutes": 200.80000000000001136868377216160297393798828125,
    "overlap_duration_s": 12051,
    "speed_a_avg": 0.340000000000000024424906541753443889319896697998046875,
    "speed_a_std": 0.2200000000000000011102230246251565404236316680908203125,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.340000000000000024424906541753443889319896697998046875,
            "max_sog": 0.59999999999999997779553950749686919152736663818359375
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-08-30T18:58:38+00:00",
        "end": "2026-08-30T22:19:29+00:00"
    },
    "points_count": {
        "vessel_a": 14,
        "vessel_b": 14
    },
    "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 283m, avg 287m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 201 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b12m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Ust-Luga\/St. Petersburg Approach"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (EUROSTAR 4 MARIA and SGV FLOT) maintained close proximity (min 283m, avg 287m) for 201 minutes. Both vessels were slow-moving (avg speeds 0.3 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

Sts🛰️? Ust-Luga/St. Petersburg Approach

Aug 30, 2026 16:07 UTC 85/100 ▼

Vessel A: MMSI 273353550 (EUROSTAR 4 MARIA) RUSSIA

Vessel B: IMO 8033089 (SGV FLOT) Russia

Minimum Distance: 283 meters
Average Distance: 287 meters
Duration: 6h 12m
Period: 2026-08-30T16:07:27+00:00 to 2026-08-30T22:19:29+00:00
Vessel A Avg Speed: 0.4 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 (EUROSTAR 4 MARIA and SGV FLOT) maintained close proximity (min 283m, avg 286m) for 372 minutes. Both vessels were slow-moving (avg speeds 0.4 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

Factor	Score	Detail
Distance Tightness	15/25	Min distance 283m, avg 286m
Duration	25/25	Duration 372 minutes
Speed Stability	20/20	both nearly stationary; very stable speeds
Distance Consistency	15/15	Distance variance ±2m
Isolation	5/10	Isolation data not available
Context	5/5	In 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

Click image to view full size

Searched: 2026-08-30T22:45:06.780098+00:00

{
    "vessel_a": {
        "mmsi": 273353550,
        "name": "EUROSTAR 4 MARIA",
        "flag": "RUSSIA"
    },
    "vessel_b": {
        "mmsi": 273458830,
        "imo": 8033089,
        "name": "SGV FLOT",
        "flag": "Russia"
    },
    "min_distance_m": 283,
    "avg_distance_m": 286.5,
    "distance_consistency_m": 2,
    "duration_minutes": 372,
    "overlap_duration_s": 22322,
    "speed_a_avg": 0.35999999999999998667732370449812151491641998291015625,
    "speed_a_std": 0.2600000000000000088817841970012523233890533447265625,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.35999999999999998667732370449812151491641998291015625,
            "max_sog": 0.90000000000000002220446049250313080847263336181640625
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-08-30T16:07:27+00:00",
        "end": "2026-08-30T22:19:29+00:00"
    },
    "points_count": {
        "vessel_a": 16,
        "vessel_b": 16
    },
    "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 283m, avg 286m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 372 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b12m"
            },
            "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 (EUROSTAR 4 MARIA and SGV FLOT) maintained close proximity (min 283m, avg 286m) for 372 minutes. Both vessels were slow-moving (avg speeds 0.4 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": 59.87682989999999705332811572588980197906494140625,
            "lon": 30.22063229999999833808033145032823085784912109375
        },
        "time_window": {
            "start_ts": "2026-08-30T16:07:27+00:00",
            "end_ts": "2026-08-30T22:19:29+00:00"
        },
        "searched_at": "2026-08-30T22:45:06.780098+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_1170619_thumbnail_20260830224510.png",
            "stored_path": "\/home\/fleetleaks\/public_html\/wp-content\/uploads\/fleetleaks-evidence\/sar-imagery\/2026\/08\/event_1170619_thumbnail_20260830224510.png",
            "source": "copernicus_dataspace"
        },
        "notes": "Preview available for manual review"
    }
}

Aug 30, 2026 16:00 UTC 80.0% ▼

Zone: Ust-Luga/St. Petersburg Approach
Duration: 6h 19m
Data Points: 18 AIS positions
Period: 2026-08-30T16:00:27+00:00 to 2026-08-30T22:19:29+00:00

{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 379,
    "points_in_zone": 18,
    "first_point": {
        "ts": "2026-08-30T16:00:27+00:00",
        "lat": 59.876755000000002837623469531536102294921875,
        "lon": 30.223253299999999654801285942085087299346923828125
    },
    "last_point": {
        "ts": "2026-08-30T22:19:29+00:00",
        "lat": 59.87673000000000200770955416373908519744873046875,
        "lon": 30.22314829999999830079104867763817310333251953125
    }
}

Aug 30, 2026 16:00 UTC 75.0% ▼

Duration: 6h 19m
Radius: 7 meters
Data Points: 18 AIS positions
Centroid: 59.8767, 30.2232
Zone: Ust-Luga/St. Petersburg Approach

{
    "radius_m": 7.4000000000000003552713678800500929355621337890625,
    "duration_minutes": 379,
    "points": 18,
    "centroid": {
        "lat": 59.87674814444444137961909291334450244903564453125,
        "lon": 30.2231885166666671693747048266232013702392578125
    },
    "bbox": {
        "min_lat": 59.8766983000000010406438377685844898223876953125,
        "min_lon": 30.22312170000000008940332918427884578704833984375,
        "max_lat": 59.876806700000003047534846700727939605712890625,
        "max_lon": 30.223253299999999654801285942085087299346923828125
    },
    "zone_id": "russia_ust_luga_approach"
}

Aug 30, 2026 14:01 UTC 82/100 ▼

Vessel A: MMSI 273353550 (EUROSTAR 4 MARIA) RUSSIA

Vessel B: IMO 8033089 (SGV FLOT) Russia

Minimum Distance: 283 meters
Average Distance: 286 meters
Duration: 6h 11m
Period: 2026-08-30T14:01:01+00:00 to 2026-08-30T20:12:27+00:00
Vessel A Avg Speed: 0.4 knots
Vessel B Avg Speed: 0.0 knots
Zone: Ust-Luga/St. Petersburg Approach

Confidence Analysis

Score: 82/100

High-confidence STS candidate. Two tankers (EUROSTAR 4 MARIA and SGV FLOT) maintained close proximity (min 283m, avg 286m) for 371 minutes. Both vessels were slow-moving (avg speeds 0.4 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

Factor	Score	Detail
Distance Tightness	15/25	Min distance 283m, avg 286m
Duration	25/25	Duration 371 minutes
Speed Stability	17/20	both nearly stationary; stable speeds
Distance Consistency	15/15	Distance variance ±2m
Isolation	5/10	Isolation data not available
Context	5/5	In monitored zone: Ust-Luga/St. Petersburg Approach

Show Raw Evidence JSON

{
    "vessel_a": {
        "mmsi": 273353550,
        "name": "EUROSTAR 4 MARIA",
        "flag": "RUSSIA"
    },
    "vessel_b": {
        "mmsi": 273458830,
        "imo": 8033089,
        "name": "SGV FLOT",
        "flag": "Russia"
    },
    "min_distance_m": 283,
    "avg_distance_m": 286.3999999999999772626324556767940521240234375,
    "distance_consistency_m": 2.399999999999999911182158029987476766109466552734375,
    "duration_minutes": 371.3999999999999772626324556767940521240234375,
    "overlap_duration_s": 22286,
    "speed_a_avg": 0.35999999999999998667732370449812151491641998291015625,
    "speed_a_std": 0.309999999999999997779553950749686919152736663818359375,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.35999999999999998667732370449812151491641998291015625,
            "max_sog": 0.90000000000000002220446049250313080847263336181640625
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-08-30T14:01:01+00:00",
        "end": "2026-08-30T20:12:27+00:00"
    },
    "points_count": {
        "vessel_a": 16,
        "vessel_b": 16
    },
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "score": {
        "value": 82,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 283m, avg 286m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 371 minutes"
            },
            "speed_stability": {
                "score": 17,
                "max": 20,
                "detail": "both nearly stationary; stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b12m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Ust-Luga\/St. Petersburg Approach"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (EUROSTAR 4 MARIA and SGV FLOT) maintained close proximity (min 283m, avg 286m) for 371 minutes. Both vessels were slow-moving (avg speeds 0.4 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 30, 2026 14:01 UTC 80.0% ▼

Zone: Ust-Luga/St. Petersburg Approach
Duration: 6h 21m
Data Points: 17 AIS positions
Period: 2026-08-30T14:01:01+00:00 to 2026-08-30T20:22:29+00:00

Show Raw Evidence JSON

{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 381.5,
    "points_in_zone": 17,
    "first_point": {
        "ts": "2026-08-30T14:01:01+00:00",
        "lat": 59.8767466999999982135705067776143550872802734375,
        "lon": 30.223143300000000266436472884379327297210693359375
    },
    "last_point": {
        "ts": "2026-08-30T20:22:29+00:00",
        "lat": 59.87672330000000187055775313638150691986083984375,
        "lon": 30.223223300000000790532794781029224395751953125
    }
}

Methodology: 2026.01.18

Loiter Ust-Luga/St. Petersburg Approach

Aug 30, 2026 14:01 UTC 75.0% ▼

Duration: 6h 21m
Radius: 8 meters
Data Points: 17 AIS positions
Centroid: 59.8767, 30.2232
Zone: Ust-Luga/St. Petersburg Approach

Show Raw Evidence JSON

{
    "radius_m": 7.5999999999999996447286321199499070644378662109375,
    "duration_minutes": 381.5,
    "points": 17,
    "centroid": {
        "lat": 59.8767468588235232118677231483161449432373046875,
        "lon": 30.22318833529411818972221226431429386138916015625
    },
    "bbox": {
        "min_lat": 59.8766882999999978665073285810649394989013671875,
        "min_lon": 30.22312170000000008940332918427884578704833984375,
        "max_lat": 59.876806700000003047534846700727939605712890625,
        "max_lon": 30.223253299999999654801285942085087299346923828125
    },
    "zone_id": "russia_ust_luga_approach"
}

Methodology: 2026.01.18

Zone Dwell Ust-Luga/St. Petersburg Approach

Aug 30, 2026 13:12 UTC 80.0% ▼

Zone: Ust-Luga/St. Petersburg Approach
Duration: 6h 29m
Data Points: 18 AIS positions
Period: 2026-08-30T13:52:50+00:00 to 2026-08-30T20:22:29+00:00

Show Raw Evidence JSON

{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 389.6000000000000227373675443232059478759765625,
    "points_in_zone": 18,
    "first_point": {
        "ts": "2026-08-30T13:52:50+00:00",
        "lat": 59.8767117000000013149474398232996463775634765625,
        "lon": 30.223221699999999856345311854965984821319580078125
    },
    "last_point": {
        "ts": "2026-08-30T20:22:29+00:00",
        "lat": 59.87672330000000187055775313638150691986083984375,
        "lon": 30.223223300000000790532794781029224395751953125
    }
}

Methodology: 2026.01.18

Loiter Ust-Luga/St. Petersburg Approach

Aug 30, 2026 13:12 UTC 75.0% ▼

Duration: 6h 29m
Radius: 8 meters
Data Points: 18 AIS positions
Centroid: 59.8767, 30.2232
Zone: Ust-Luga/St. Petersburg Approach

Show Raw Evidence JSON

{
    "radius_m": 7.70000000000000017763568394002504646778106689453125,
    "duration_minutes": 389.6000000000000227373675443232059478759765625,
    "points": 18,
    "centroid": {
        "lat": 59.87674490555554740467414376325905323028564453125,
        "lon": 30.223190188888889196050513419322669506072998046875
    },
    "bbox": {
        "min_lat": 59.8766882999999978665073285810649394989013671875,
        "min_lon": 30.22312170000000008940332918427884578704833984375,
        "max_lat": 59.876806700000003047534846700727939605712890625,
        "max_lon": 30.223253299999999654801285942085087299346923828125
    },
    "zone_id": "russia_ust_luga_approach"
}

Methodology: 2026.01.18

Sts🛰️? Ust-Luga/St. Petersburg Approach

Aug 30, 2026 13:09 UTC 73/100 ▼

Vessel A: Thoth (THOTH) Russia

Vessel B: MMSI 273353550 (EUROSTAR 4 MARIA) RUSSIA

Minimum Distance: 160 meters
Average Distance: 163 meters
Duration: 58 minutes
Period: 2026-08-30T13:09:21+00:00 to 2026-08-30T14:08:01+00:00
Vessel A Avg Speed: 0.0 knots
Vessel B Avg Speed: 0.6 knots
Zone: Ust-Luga/St. Petersburg Approach

Confidence Analysis

Score: 73/100

Moderate-confidence STS candidate. Two tankers (THOTH and EUROSTAR 4 MARIA) maintained close proximity (min 160m, avg 163m) for 59 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.6 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

Factor	Score	Detail
Distance Tightness	20/25	Min distance 160m, avg 163m
Duration	10/25	Duration 59 minutes
Speed Stability	18/20	both very slow; very stable speeds
Distance Consistency	15/15	Distance variance ±3m
Isolation	5/10	Isolation data not available
Context	5/5	In 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

Click image to view full size

Searched: 2026-08-30T16:30:01.395775+00:00

{
    "vessel_a": {
        "mmsi": 273253080,
        "imo": 9164718,
        "name": "THOTH",
        "flag": "Russia"
    },
    "vessel_b": {
        "mmsi": 273353550,
        "name": "EUROSTAR 4 MARIA",
        "flag": "RUSSIA"
    },
    "min_distance_m": 159.599999999999994315658113919198513031005859375,
    "avg_distance_m": 163.400000000000005684341886080801486968994140625,
    "distance_consistency_m": 3.399999999999999911182158029987476766109466552734375,
    "duration_minutes": 58.7000000000000028421709430404007434844970703125,
    "overlap_duration_s": 3520,
    "speed_a_avg": 0,
    "speed_a_std": 0,
    "speed_b_avg": 0.56999999999999995115018691649311222136020660400390625,
    "speed_b_std": 0.2099999999999999922284388276239042170345783233642578125,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0,
            "max_sog": 0
        },
        "vessel_b": {
            "avg_sog": 0.56999999999999995115018691649311222136020660400390625,
            "max_sog": 0.8000000000000000444089209850062616169452667236328125
        }
    },
    "time_window": {
        "start": "2026-08-30T13:09:21+00:00",
        "end": "2026-08-30T14:08:01+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": 73,
        "components": {
            "distance_tightness": {
                "score": 20,
                "max": 25,
                "detail": "Min distance 160m, avg 163m"
            },
            "duration": {
                "score": 10,
                "max": 25,
                "detail": "Duration 59 minutes"
            },
            "speed_stability": {
                "score": 18,
                "max": 20,
                "detail": "both very slow; 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 (THOTH and EUROSTAR 4 MARIA) maintained close proximity (min 160m, avg 163m) for 59 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.6 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": 59.8767196000000012645614333450794219970703125,
            "lon": 30.2217614999999995006874087266623973846435546875
        },
        "time_window": {
            "start_ts": "2026-08-30T13:09:21+00:00",
            "end_ts": "2026-08-30T14:08:01+00:00"
        },
        "searched_at": "2026-08-30T16:30:01.395775+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_1168684_thumbnail_20260830163006.png",
            "stored_path": "\/home\/fleetleaks\/public_html\/wp-content\/uploads\/fleetleaks-evidence\/sar-imagery\/2026\/08\/event_1168684_thumbnail_20260830163006.png",
            "source": "copernicus_dataspace"
        },
        "notes": "Preview available for manual review"
    }
}

Aug 30, 2026 13:06 UTC 82/100 ▼

Vessel A: MMSI 273353550 (EUROSTAR 4 MARIA) RUSSIA

Vessel B: IMO 8033089 (SGV FLOT) Russia

Minimum Distance: 283 meters
Average Distance: 286 meters
Duration: 5h 39m
Period: 2026-08-30T13:52:50+00:00 to 2026-08-30T19:32:38+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: 82/100

High-confidence STS candidate. Two tankers (EUROSTAR 4 MARIA and SGV FLOT) maintained close proximity (min 283m, avg 286m) for 340 minutes. Both vessels were slow-moving (avg speeds 0.3 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

Factor	Score	Detail
Distance Tightness	15/25	Min distance 283m, avg 286m
Duration	25/25	Duration 340 minutes
Speed Stability	17/20	both nearly stationary; stable speeds
Distance Consistency	15/15	Distance variance ±3m
Isolation	5/10	Isolation data not available
Context	5/5	In monitored zone: Ust-Luga/St. Petersburg Approach

Show Raw Evidence JSON

{
    "vessel_a": {
        "mmsi": 273353550,
        "name": "EUROSTAR 4 MARIA",
        "flag": "RUSSIA"
    },
    "vessel_b": {
        "mmsi": 273458830,
        "imo": 8033089,
        "name": "SGV FLOT",
        "flag": "Russia"
    },
    "min_distance_m": 283,
    "avg_distance_m": 286.3999999999999772626324556767940521240234375,
    "distance_consistency_m": 2.600000000000000088817841970012523233890533447265625,
    "duration_minutes": 339.80000000000001136868377216160297393798828125,
    "overlap_duration_s": 20388,
    "speed_a_avg": 0.340000000000000024424906541753443889319896697998046875,
    "speed_a_std": 0.330000000000000015543122344752191565930843353271484375,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.340000000000000024424906541753443889319896697998046875,
            "max_sog": 0.90000000000000002220446049250313080847263336181640625
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-08-30T13:52:50+00:00",
        "end": "2026-08-30T19:32:38+00:00"
    },
    "points_count": {
        "vessel_a": 13,
        "vessel_b": 13
    },
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "score": {
        "value": 82,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 283m, avg 286m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 340 minutes"
            },
            "speed_stability": {
                "score": 17,
                "max": 20,
                "detail": "both nearly stationary; 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 (EUROSTAR 4 MARIA and SGV FLOT) maintained close proximity (min 283m, avg 286m) for 340 minutes. Both vessels were slow-moving (avg speeds 0.3 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 30, 2026 12:00 UTC 80.0% ▼

Zone: Ust-Luga/St. Petersburg Approach
Duration: 6h 30m
Data Points: 15 AIS positions
Period: 2026-08-30T12:47:10+00:00 to 2026-08-30T19:17:18+00:00

Show Raw Evidence JSON

{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 390.1000000000000227373675443232059478759765625,
    "points_in_zone": 15,
    "first_point": {
        "ts": "2026-08-30T12:47:10+00:00",
        "lat": 59.8797349999999966030372888781130313873291015625,
        "lon": 30.214631700000001757189238560386002063751220703125
    },
    "last_point": {
        "ts": "2026-08-30T19:17:18+00:00",
        "lat": 59.87675999999999731926436652429401874542236328125,
        "lon": 30.223188300000000339196049026213586330413818359375
    }
}

Methodology: 2026.01.18

Loiter Ust-Luga/St. Petersburg Approach

Aug 30, 2026 12:00 UTC 75.0% ▼

Duration: 6h 30m
Radius: 545 meters
Data Points: 15 AIS positions
Centroid: 59.8769, 30.2226
Zone: Ust-Luga/St. Petersburg Approach

Show Raw Evidence JSON

{
    "radius_m": 544.799999999999954525264911353588104248046875,
    "duration_minutes": 390.1000000000000227373675443232059478759765625,
    "points": 15,
    "centroid": {
        "lat": 59.87694067333332981206694967113435268402099609375,
        "lon": 30.22261489333333628337641130201518535614013671875
    },
    "bbox": {
        "min_lat": 59.8766882999999978665073285810649394989013671875,
        "min_lon": 30.214631700000001757189238560386002063751220703125,
        "max_lat": 59.8797349999999966030372888781130313873291015625,
        "max_lon": 30.223265000000001379021341563202440738677978515625
    },
    "zone_id": "russia_ust_luga_approach"
}

Methodology: 2026.01.18

Zone Dwell Ust-Luga/St. Petersburg Approach

Aug 30, 2026 11:01 UTC 80.0% ▼

Zone: Ust-Luga/St. Petersburg Approach
Duration: 5h 9m
Data Points: 22 AIS positions
Period: 2026-08-30T11:01:35+00:00 to 2026-08-30T16:10:47+00:00

Show Raw Evidence JSON

{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 309.19999999999998863131622783839702606201171875,
    "points_in_zone": 22,
    "first_point": {
        "ts": "2026-08-30T11:01:35+00:00",
        "lat": 59.88537170000000031677700462751090526580810546875,
        "lon": 30.21255670000000037589416024275124073028564453125
    },
    "last_point": {
        "ts": "2026-08-30T16:10:47+00:00",
        "lat": 59.87676499999999890633262111805379390716552734375,
        "lon": 30.223189999999998889279595459811389446258544921875
    }
}

Methodology: 2026.01.18

Loiter Ust-Luga/St. Petersburg Approach

Aug 30, 2026 11:01 UTC 75.0% ▼

Duration: 5h 9m
Radius: 594 meters
Data Points: 22 AIS positions
Centroid: 59.8812, 30.2175
Zone: Ust-Luga/St. Petersburg Approach

Show Raw Evidence JSON

{
    "radius_m": 593.5,
    "duration_minutes": 309.19999999999998863131622783839702606201171875,
    "points": 22,
    "centroid": {
        "lat": 59.881183036363637484100763686001300811767578125,
        "lon": 30.2175034090909093720256350934505462646484375
    },
    "bbox": {
        "min_lat": 59.8766882999999978665073285810649394989013671875,
        "min_lon": 30.21251170000000030313458410091698169708251953125,
        "max_lat": 59.88541169999999880246832617558538913726806640625,
        "max_lon": 30.223265000000001379021341563202440738677978515625
    },
    "zone_id": "russia_ust_luga_approach"
}

Methodology: 2026.01.18

Sts🛰️? Ust-Luga/St. Petersburg Approach

Aug 30, 2026 10:12 UTC 72/100 ▼

Vessel A: MMSI 273353550 (EUROSTAR 4 MARIA) RUSSIA

Vessel B: IMO 8859639 (VALAAMS) RUSSIA

Minimum Distance: 99 meters
Average Distance: 100 meters
Duration: 38 minutes
Period: 2026-08-30T10:12:55+00:00 to 2026-08-30T10:51:14+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: 72/100

Moderate-confidence STS candidate. Two tankers (EUROSTAR 4 MARIA and VALAAMS) maintained close proximity (min 99m, avg 100m) for 38 minutes. Both vessels were slow-moving (avg speeds 0.3 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

Factor	Score	Detail
Distance Tightness	25/25	Min distance 99m, avg 100m
Duration	5/25	Duration 38 minutes
Speed Stability	17/20	both nearly stationary; stable speeds
Distance Consistency	15/15	Distance variance ±1m
Isolation	5/10	Isolation data not available
Context	5/5	In 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

Click image to view full size

Searched: 2026-08-30T11:30:01.249097+00:00

{
    "vessel_a": {
        "mmsi": 273353550,
        "name": "EUROSTAR 4 MARIA",
        "flag": "RUSSIA"
    },
    "vessel_b": {
        "mmsi": 273454000,
        "imo": 8859639,
        "name": "VALAAMS",
        "flag": "RUSSIA"
    },
    "min_distance_m": 99,
    "avg_distance_m": 100.2000000000000028421709430404007434844970703125,
    "distance_consistency_m": 1,
    "duration_minutes": 38.2999999999999971578290569595992565155029296875,
    "overlap_duration_s": 2299,
    "speed_a_avg": 0.270000000000000017763568394002504646778106689453125,
    "speed_a_std": 0.35999999999999998667732370449812151491641998291015625,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.270000000000000017763568394002504646778106689453125,
            "max_sog": 0.90000000000000002220446049250313080847263336181640625
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-08-30T10:12:55+00:00",
        "end": "2026-08-30T10:51:14+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": 72,
        "components": {
            "distance_tightness": {
                "score": 25,
                "max": 25,
                "detail": "Min distance 99m, avg 100m"
            },
            "duration": {
                "score": 5,
                "max": 25,
                "detail": "Duration 38 minutes"
            },
            "speed_stability": {
                "score": 17,
                "max": 20,
                "detail": "both nearly stationary; stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b11m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Ust-Luga\/St. Petersburg Approach"
            }
        },
        "summary": "Moderate-confidence STS candidate. Two tankers (EUROSTAR 4 MARIA and VALAAMS) maintained close proximity (min 99m, avg 100m) for 38 minutes. Both vessels were slow-moving (avg speeds 0.3 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": 59.884927500000003419700078666210174560546875,
            "lon": 30.2125060999999988098352332599461078643798828125
        },
        "time_window": {
            "start_ts": "2026-08-30T10:12:55+00:00",
            "end_ts": "2026-08-30T10:51:14+00:00"
        },
        "searched_at": "2026-08-30T11:30:01.249097+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_1167359_thumbnail_20260830113005.png",
            "stored_path": "\/home\/fleetleaks\/public_html\/wp-content\/uploads\/fleetleaks-evidence\/sar-imagery\/2026\/08\/event_1167359_thumbnail_20260830113005.png",
            "source": "copernicus_dataspace"
        },
        "notes": "Preview available for manual review"
    }
}

Aug 30, 2026 10:12 UTC 80.0% ▼

Zone: Ust-Luga/St. Petersburg Approach
Duration: 5h 57m
Data Points: 29 AIS positions
Period: 2026-08-30T10:12:55+00:00 to 2026-08-30T16:10:47+00:00

{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 357.8999999999999772626324556767940521240234375,
    "points_in_zone": 29,
    "first_point": {
        "ts": "2026-08-30T10:12:55+00:00",
        "lat": 59.88537500000000335376171278767287731170654296875,
        "lon": 30.21254330000000010159055818803608417510986328125
    },
    "last_point": {
        "ts": "2026-08-30T16:10:47+00:00",
        "lat": 59.87676499999999890633262111805379390716552734375,
        "lon": 30.223189999999998889279595459811389446258544921875
    }
}

Aug 30, 2026 10:12 UTC 75.0% ▼

Duration: 5h 57m
Radius: 725 meters
Data Points: 29 AIS positions
Centroid: 59.8822, 30.2163
Zone: Ust-Luga/St. Petersburg Approach

{
    "radius_m": 724.700000000000045474735088646411895751953125,
    "duration_minutes": 357.8999999999999772626324556767940521240234375,
    "points": 29,
    "centroid": {
        "lat": 59.8821958620689684948956710286438465118408203125,
        "lon": 30.21630614482759114025611779652535915374755859375
    },
    "bbox": {
        "min_lat": 59.8766882999999978665073285810649394989013671875,
        "min_lon": 30.21249830000000002883098204620182514190673828125,
        "max_lat": 59.88541169999999880246832617558538913726806640625,
        "max_lon": 30.223265000000001379021341563202440738677978515625
    },
    "zone_id": "russia_ust_luga_approach"
}

Aug 30, 2026 09:06 UTC 80.0% ▼

Zone: Ust-Luga/St. Petersburg Approach
Duration: 6h 20m
Data Points: 32 AIS positions
Period: 2026-08-30T09:50:44+00:00 to 2026-08-30T16:10:47+00:00

{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 380.1000000000000227373675443232059478759765625,
    "points_in_zone": 32,
    "first_point": {
        "ts": "2026-08-30T09:50:44+00:00",
        "lat": 59.88539670000000114669091999530792236328125,
        "lon": 30.212559999999999860165189602412283420562744140625
    },
    "last_point": {
        "ts": "2026-08-30T16:10:47+00:00",
        "lat": 59.87676499999999890633262111805379390716552734375,
        "lon": 30.223189999999998889279595459811389446258544921875
    }
}

Aug 30, 2026 09:06 UTC 75.0% ▼

Duration: 6h 20m
Radius: 763 meters
Data Points: 32 AIS positions
Centroid: 59.8825, 30.2160
Zone: Ust-Luga/St. Petersburg Approach

{
    "radius_m": 763.3999999999999772626324556767940521240234375,
    "duration_minutes": 380.1000000000000227373675443232059478759765625,
    "points": 32,
    "centroid": {
        "lat": 59.8824950531249982077497406862676143646240234375,
        "lon": 30.2159546843750064226696849800646305084228515625
    },
    "bbox": {
        "min_lat": 59.8766882999999978665073285810649394989013671875,
        "min_lon": 30.21249830000000002883098204620182514190673828125,
        "max_lat": 59.88541169999999880246832617558538913726806640625,
        "max_lon": 30.223265000000001379021341563202440738677978515625
    },
    "zone_id": "russia_ust_luga_approach"
}

Aug 30, 2026 08:03 UTC 80.0% ▼

Zone: Ust-Luga/St. Petersburg Approach
Duration: 6h 2m
Data Points: 38 AIS positions
Period: 2026-08-30T08:03:34+00:00 to 2026-08-30T14:05:50+00:00

{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 362.30000000000001136868377216160297393798828125,
    "points_in_zone": 38,
    "first_point": {
        "ts": "2026-08-30T08:03:34+00:00",
        "lat": 59.8853950000000025966073735617101192474365234375,
        "lon": 30.212624999999999175770426518283784389495849609375
    },
    "last_point": {
        "ts": "2026-08-30T14:05:50+00:00",
        "lat": 59.8766882999999978665073285810649394989013671875,
        "lon": 30.223191700000000992076820693910121917724609375
    }
}

Aug 30, 2026 08:03 UTC 75.0% ▼

Duration: 6h 2m
Radius: 942 meters
Data Points: 38 AIS positions
Centroid: 59.8839, 30.2143
Zone: Ust-Luga/St. Petersburg Approach

{
    "radius_m": 941.6000000000000227373675443232059478759765625,
    "duration_minutes": 362.30000000000001136868377216160297393798828125,
    "points": 38,
    "centroid": {
        "lat": 59.88386267368421300716363475657999515533447265625,
        "lon": 30.21430512894736608586754300631582736968994140625
    },
    "bbox": {
        "min_lat": 59.8766882999999978665073285810649394989013671875,
        "min_lon": 30.21249830000000002883098204620182514190673828125,
        "max_lat": 59.8854232999999993580786394886672496795654296875,
        "max_lon": 30.223265000000001379021341563202440738677978515625
    },
    "zone_id": "russia_ust_luga_approach"
}

Aug 30, 2026 07:06 UTC 95/100 ▼

Vessel A: IMO 8859639 (VALAAMS) RUSSIA

Vessel B: MMSI 273353550 (EUROSTAR 4 MARIA) RUSSIA

Minimum Distance: 99 meters
Average Distance: 102 meters
Duration: 3h 39m
Period: 2026-08-30T07:06:56+00:00 to 2026-08-30T10:45:55+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: 95/100

High-confidence STS candidate. Two tankers (VALAAMS and EUROSTAR 4 MARIA) maintained close proximity (min 98m, avg 102m) for 219 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

Factor	Score	Detail
Distance Tightness	25/25	Min distance 98m, avg 102m
Duration	25/25	Duration 219 minutes
Speed Stability	20/20	both nearly stationary; very stable speeds
Distance Consistency	15/15	Distance variance ±6m
Isolation	5/10	Isolation data not available
Context	5/5	In 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

Click image to view full size

Searched: 2026-08-30T13:45:01.802968+00:00

{
    "vessel_a": {
        "mmsi": 273454000,
        "imo": 8859639,
        "name": "VALAAMS",
        "flag": "RUSSIA"
    },
    "vessel_b": {
        "mmsi": 273353550,
        "name": "EUROSTAR 4 MARIA",
        "flag": "RUSSIA"
    },
    "min_distance_m": 98.5,
    "avg_distance_m": 102,
    "distance_consistency_m": 6,
    "duration_minutes": 219,
    "overlap_duration_s": 13139,
    "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": "2026-08-30T07:06:56+00:00",
        "end": "2026-08-30T10:45:55+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": 95,
        "components": {
            "distance_tightness": {
                "score": 25,
                "max": 25,
                "detail": "Min distance 98m, avg 102m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 219 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 (VALAAMS and EUROSTAR 4 MARIA) maintained close proximity (min 98m, avg 102m) for 219 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": 59.88492999999999710780684836208820343017578125,
            "lon": 30.212518100000000487170837004669010639190673828125
        },
        "time_window": {
            "start_ts": "2026-08-30T07:06:56+00:00",
            "end_ts": "2026-08-30T10:45:55+00:00"
        },
        "searched_at": "2026-08-30T13:45:01.802968+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_1167899_thumbnail_20260830134508.png",
            "stored_path": "\/home\/fleetleaks\/public_html\/wp-content\/uploads\/fleetleaks-evidence\/sar-imagery\/2026\/08\/event_1167899_thumbnail_20260830134508.png",
            "source": "copernicus_dataspace"
        },
        "notes": "Preview available for manual review"
    }
}

Aug 30, 2026 07:02 UTC 80.0% ▼

Zone: Ust-Luga/St. Petersburg Approach
Duration: 6h 20m
Data Points: 39 AIS positions
Period: 2026-08-30T07:45:05+00:00 to 2026-08-30T14:05:50+00:00

{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 380.80000000000001136868377216160297393798828125,
    "points_in_zone": 39,
    "first_point": {
        "ts": "2026-08-30T07:45:05+00:00",
        "lat": 59.88542830000000094514689408242702484130859375,
        "lon": 30.21267329999999873280103201977908611297607421875
    },
    "last_point": {
        "ts": "2026-08-30T14:05:50+00:00",
        "lat": 59.8766882999999978665073285810649394989013671875,
        "lon": 30.223191700000000992076820693910121917724609375
    }
}

Aug 30, 2026 07:02 UTC 75.0% ▼

Duration: 6h 20m
Radius: 947 meters
Data Points: 39 AIS positions
Centroid: 59.8839, 30.2143
Zone: Ust-Luga/St. Petersburg Approach

{
    "radius_m": 946.6000000000000227373675443232059478759765625,
    "duration_minutes": 380.80000000000001136868377216160297393798828125,
    "points": 39,
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    "zone_id": "russia_ust_luga_approach"
}

Aug 30, 2026 06:36 UTC 80.0% ▼

Zone: Ust-Luga/St. Petersburg Approach
Duration: 6h 30m
Data Points: 39 AIS positions
Period: 2026-08-30T06:55:45+00:00 to 2026-08-30T13:26:10+00:00

{
    "zone_id": "russia_ust_luga_approach",
    "zone_name": "Ust-Luga\/St. Petersburg Approach",
    "dwell_minutes": 390.3999999999999772626324556767940521240234375,
    "points_in_zone": 39,
    "first_point": {
        "ts": "2026-08-30T06:55:45+00:00",
        "lat": 59.88540830000000170230123330838978290557861328125,
        "lon": 30.2125300000000009958966984413564205169677734375
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    "last_point": {
        "ts": "2026-08-30T13:26:10+00:00",
        "lat": 59.8767016999999981408109306357800960540771484375,
        "lon": 30.22315329999999988785930327139794826507568359375
    }
}

Aug 30, 2026 06:36 UTC 75.0% ▼

Duration: 6h 30m
Radius: 1,061 meters
Data Points: 39 AIS positions
Centroid: 59.8848, 30.2132
Zone: Ust-Luga/St. Petersburg Approach

{
    "radius_m": 1060.799999999999954525264911353588104248046875,
    "duration_minutes": 390.3999999999999772626324556767940521240234375,
    "points": 39,
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        "lon": 30.21317093589743052461926708929240703582763671875
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        "max_lon": 30.223265000000001379021341563202440738677978515625
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    "zone_id": "russia_ust_luga_approach"
}