KORSAKOV

{
    "vessel_a": {
        "mmsi": 273353940,
        "imo": 8724793,
        "name": "KORSAKOV",
        "flag": "RUSSIA"
    },
    "vessel_b": {
        "mmsi": 273331620,
        "imo": 8724779,
        "name": "VANINO",
        "flag": "RUSSIA"
    },
    "min_distance_m": 21.10000000000000142108547152020037174224853515625,
    "avg_distance_m": 22.89999999999999857891452847979962825775146484375,
    "distance_consistency_m": 1.1999999999999999555910790149937383830547332763671875,
    "duration_minutes": 56.5,
    "overlap_duration_s": 3392,
    "speed_a_avg": 0,
    "speed_a_std": 0,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0,
            "max_sog": 0
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-05-04T07:07:07+00:00",
        "end": "2026-05-04T08:03:39+00:00"
    },
    "points_count": {
        "vessel_a": 19,
        "vessel_b": 19
    },
    "zone_id": "russia_ust_luga",
    "zone_name": "Ust-Luga Terminal Complex",
    "score": {
        "value": 80,
        "components": {
            "distance_tightness": {
                "score": 25,
                "max": 25,
                "detail": "Min distance 21m, avg 23m"
            },
            "duration": {
                "score": 10,
                "max": 25,
                "detail": "Duration 56 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b11m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Ust-Luga Terminal Complex"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (KORSAKOV and VANINO) maintained close proximity (min 21m, avg 23m) for 56 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Ust-Luga Terminal Complex, a known STS activity area."
    },
    "sar": {
        "status": "inconclusive",
        "centroid": {
            "lat": 59.7719282999999990124706528149545192718505859375,
            "lon": 28.443560000000001508624336565844714641571044921875
        },
        "time_window": {
            "start_ts": "2026-05-04T07:07:07+00:00",
            "end_ts": "2026-05-04T08:03:39+00:00"
        },
        "searched_at": "2026-05-04T13:45:10.219966+00:00",
        "scene_id": "S1C_EW_GRDM_1SDH_20260504T044051_20260504T044151_007499_00F398_3E10_COG",
        "scene_datetime": "2026-05-04T04:40:51.268359Z",
        "platform": "sentinel-1c",
        "bbox": {
            "min_lon": 21.9211600000000004229150363244116306304931640625,
            "min_lat": 58.01894800000000174122760654427111148834228515625,
            "max_lon": 30.81303199999999975489117787219583988189697265625,
            "max_lat": 62.32932699999999925921656540594995021820068359375
        },
        "assets": {
            "preview_url": "https:\/\/fleetleaks.com\/wp-content\/uploads\/fleetleaks-evidence\/sar-imagery\/2026\/05\/event_483619_thumbnail_20260504134513.png",
            "stored_path": "\/home\/fleetleaks\/public_html\/wp-content\/uploads\/fleetleaks-evidence\/sar-imagery\/2026\/05\/event_483619_thumbnail_20260504134513.png",
            "source": "copernicus_dataspace"
        },
        "notes": "Preview available for manual review"
    }
}

May 4, 2026 07:01 UTC 80.0% ▼

Zone: Ust-Luga Terminal Complex
Duration: 1h 6m
Data Points: 22 AIS positions
Period: 2026-05-04T07:01:07+00:00 to 2026-05-04T08:07:48+00:00

{
    "zone_id": "russia_ust_luga",
    "zone_name": "Ust-Luga Terminal Complex",
    "dwell_minutes": 66.7000000000000028421709430404007434844970703125,
    "points_in_zone": 22,
    "first_point": {
        "ts": "2026-05-04T07:01:07+00:00",
        "lat": 59.77198829999999674100763513706624507904052734375,
        "lon": 28.4434116999999986319380695931613445281982421875
    },
    "last_point": {
        "ts": "2026-05-04T08:07:48+00:00",
        "lat": 59.7719967000000025336703401990234851837158203125,
        "lon": 28.443413299999999566125552519224584102630615234375
    }
}

Sts🛰️? Ust-Luga Terminal Complex

May 4, 2026 06:05 UTC 90/100 ▼

Vessel A: IMO 8724793 (KORSAKOV) RUSSIA

Vessel B: Vanino (VANINO) RUSSIA

Minimum Distance: 14 meters
Average Distance: 23 meters
Duration: 1h 58m
Period: 2026-05-04T06:05:38+00:00 to 2026-05-04T08:03:39+00:00
Vessel A Avg Speed: 0.0 knots
Vessel B Avg Speed: 0.0 knots
Zone: Ust-Luga Terminal Complex

Confidence Analysis

Score: 90/100

High-confidence STS candidate. Two tankers (KORSAKOV and VANINO) maintained close proximity (min 14m, avg 22m) for 118 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Ust-Luga Terminal Complex, a known STS activity area.

View scoring breakdown

Factor	Score	Detail
Distance Tightness	25/25	Min distance 14m, avg 22m
Duration	20/25	Duration 118 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 Terminal Complex

🛰️ Satellite Corroboration

? SAR Inconclusive

Satellite imagery available but requires review

Preview available for manual review

Scene: S1C_EW_GRDM_1SDH_20260504T044051_20260504T044151_007499_00F398_3E10_COG • Acquired: 2026-05-04T04:40:51.268359Z • Platform: sentinel-1c

Click image to view full size

Searched: 2026-05-04T12:45:04.044089+00:00

{
    "vessel_a": {
        "mmsi": 273353940,
        "imo": 8724793,
        "name": "KORSAKOV",
        "flag": "RUSSIA"
    },
    "vessel_b": {
        "mmsi": 273331620,
        "imo": 8724779,
        "name": "VANINO",
        "flag": "RUSSIA"
    },
    "min_distance_m": 14.0999999999999996447286321199499070644378662109375,
    "avg_distance_m": 22.5,
    "distance_consistency_m": 2.20000000000000017763568394002504646778106689453125,
    "duration_minutes": 118,
    "overlap_duration_s": 7081,
    "speed_a_avg": 0,
    "speed_a_std": 0,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0,
            "max_sog": 0
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-05-04T06:05:38+00:00",
        "end": "2026-05-04T08:03:39+00:00"
    },
    "points_count": {
        "vessel_a": 40,
        "vessel_b": 40
    },
    "zone_id": "russia_ust_luga",
    "zone_name": "Ust-Luga Terminal Complex",
    "score": {
        "value": 90,
        "components": {
            "distance_tightness": {
                "score": 25,
                "max": 25,
                "detail": "Min distance 14m, avg 22m"
            },
            "duration": {
                "score": 20,
                "max": 25,
                "detail": "Duration 118 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 Terminal Complex"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (KORSAKOV and VANINO) maintained close proximity (min 14m, avg 22m) for 118 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Ust-Luga Terminal Complex, a known STS activity area."
    },
    "sar": {
        "status": "inconclusive",
        "centroid": {
            "lat": 59.77192939999999765632310300134122371673583984375,
            "lon": 28.44355420000000123081917990930378437042236328125
        },
        "time_window": {
            "start_ts": "2026-05-04T06:05:38+00:00",
            "end_ts": "2026-05-04T08:03:39+00:00"
        },
        "searched_at": "2026-05-04T12:45:04.044089+00:00",
        "scene_id": "S1C_EW_GRDM_1SDH_20260504T044051_20260504T044151_007499_00F398_3E10_COG",
        "scene_datetime": "2026-05-04T04:40:51.268359Z",
        "platform": "sentinel-1c",
        "bbox": {
            "min_lon": 21.9211600000000004229150363244116306304931640625,
            "min_lat": 58.01894800000000174122760654427111148834228515625,
            "max_lon": 30.81303199999999975489117787219583988189697265625,
            "max_lat": 62.32932699999999925921656540594995021820068359375
        },
        "assets": {
            "preview_url": "https:\/\/fleetleaks.com\/wp-content\/uploads\/fleetleaks-evidence\/sar-imagery\/2026\/05\/event_483488_thumbnail_20260504124508.png",
            "stored_path": "\/home\/fleetleaks\/public_html\/wp-content\/uploads\/fleetleaks-evidence\/sar-imagery\/2026\/05\/event_483488_thumbnail_20260504124508.png",
            "source": "copernicus_dataspace"
        },
        "notes": "Preview available for manual review"
    }
}

May 4, 2026 06:02 UTC 80.0% ▼

Zone: Ust-Luga Terminal Complex
Duration: 2h 5m
Data Points: 42 AIS positions
Period: 2026-05-04T06:02:38+00:00 to 2026-05-04T08:07:48+00:00

{
    "zone_id": "russia_ust_luga",
    "zone_name": "Ust-Luga Terminal Complex",
    "dwell_minutes": 125.2000000000000028421709430404007434844970703125,
    "points_in_zone": 42,
    "first_point": {
        "ts": "2026-05-04T06:02:38+00:00",
        "lat": 59.77198829999999674100763513706624507904052734375,
        "lon": 28.443381699999999767669578432105481624603271484375
    },
    "last_point": {
        "ts": "2026-05-04T08:07:48+00:00",
        "lat": 59.7719967000000025336703401990234851837158203125,
        "lon": 28.443413299999999566125552519224584102630615234375
    }
}

May 4, 2026 06:02 UTC 75.0% ▼

Duration: 2h 5m
Radius: 3 meters
Data Points: 42 AIS positions
Centroid: 59.7720, 28.4434
Zone: Ust-Luga Terminal Complex

{
    "radius_m": 3,
    "duration_minutes": 125.2000000000000028421709430404007434844970703125,
    "points": 42,
    "centroid": {
        "lat": 59.7719850023809584627088042907416820526123046875,
        "lon": 28.443387816666660938835775596089661121368408203125
    },
    "bbox": {
        "min_lat": 59.77195830000000142945282277651131153106689453125,
        "min_lon": 28.443349999999998800603862036950886249542236328125,
        "max_lat": 59.77199829999999991514414432458579540252685546875,
        "max_lon": 28.443418300000001153193807112984359264373779296875
    },
    "zone_id": "russia_ust_luga"
}

Sts Ust-Luga Terminal Complex

May 4, 2026 05:03 UTC 95/100 ▼

Vessel A: Vanino (VANINO) RUSSIA

Vessel B: IMO 8724793 (KORSAKOV) RUSSIA

Minimum Distance: 14 meters
Average Distance: 23 meters
Duration: 2h 44m
Period: 2026-05-04T05:22:09+00:00 to 2026-05-04T08:06:23+00:00
Vessel A Avg Speed: 0.0 knots
Vessel B Avg Speed: 0.0 knots
Zone: Ust-Luga Terminal Complex

Confidence Analysis

Score: 95/100

High-confidence STS candidate. Two tankers (VANINO and KORSAKOV) maintained close proximity (min 14m, avg 22m) for 164 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Ust-Luga Terminal Complex, a known STS activity area.

View scoring breakdown

Factor	Score	Detail
Distance Tightness	25/25	Min distance 14m, avg 22m
Duration	25/25	Duration 164 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 Terminal Complex

Show Raw Evidence JSON

{
    "vessel_a": {
        "mmsi": 273331620,
        "imo": 8724779,
        "name": "VANINO",
        "flag": "RUSSIA"
    },
    "vessel_b": {
        "mmsi": 273353940,
        "imo": 8724793,
        "name": "KORSAKOV",
        "flag": "RUSSIA"
    },
    "min_distance_m": 14.0999999999999996447286321199499070644378662109375,
    "avg_distance_m": 22.5,
    "distance_consistency_m": 1.8000000000000000444089209850062616169452667236328125,
    "duration_minutes": 164.19999999999998863131622783839702606201171875,
    "overlap_duration_s": 9854,
    "speed_a_avg": 0,
    "speed_a_std": 0,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0,
            "max_sog": 0
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-05-04T05:22:09+00:00",
        "end": "2026-05-04T08:06:23+00:00"
    },
    "points_count": {
        "vessel_a": 33,
        "vessel_b": 33
    },
    "zone_id": "russia_ust_luga",
    "zone_name": "Ust-Luga Terminal Complex",
    "score": {
        "value": 95,
        "components": {
            "distance_tightness": {
                "score": 25,
                "max": 25,
                "detail": "Min distance 14m, avg 22m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 164 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 Terminal Complex"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (VANINO and KORSAKOV) maintained close proximity (min 14m, avg 22m) for 164 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Ust-Luga Terminal Complex, a known STS activity area."
    }
}

Methodology: 2026.01.18

Zone Dwell Ust-Luga Terminal Complex

May 4, 2026 05:01 UTC 80.0% ▼

Zone: Ust-Luga Terminal Complex
Duration: 3h 6m
Data Points: 63 AIS positions
Period: 2026-05-04T05:01:09+00:00 to 2026-05-04T08:07:48+00:00

Show Raw Evidence JSON

{
    "zone_id": "russia_ust_luga",
    "zone_name": "Ust-Luga Terminal Complex",
    "dwell_minutes": 186.69999999999998863131622783839702606201171875,
    "points_in_zone": 63,
    "first_point": {
        "ts": "2026-05-04T05:01:09+00:00",
        "lat": 59.772026699999997845225152559578418731689453125,
        "lon": 28.443388299999998736211637151427567005157470703125
    },
    "last_point": {
        "ts": "2026-05-04T08:07:48+00:00",
        "lat": 59.7719967000000025336703401990234851837158203125,
        "lon": 28.443413299999999566125552519224584102630615234375
    }
}

Methodology: 2026.01.18

Loiter Ust-Luga Terminal Complex

May 4, 2026 05:01 UTC 75.0% ▼

Duration: 3h 6m
Radius: 5 meters
Data Points: 63 AIS positions
Centroid: 59.7720, 28.4434
Zone: Ust-Luga Terminal Complex

Show Raw Evidence JSON

{
    "radius_m": 4.5999999999999996447286321199499070644378662109375,
    "duration_minutes": 186.69999999999998863131622783839702606201171875,
    "points": 63,
    "centroid": {
        "lat": 59.7719882507936546289784018881618976593017578125,
        "lon": 28.443390079365084233131710789166390895843505859375
    },
    "bbox": {
        "min_lat": 59.77195830000000142945282277651131153106689453125,
        "min_lon": 28.44334669999999931633283267728984355926513671875,
        "max_lat": 59.772026699999997845225152559578418731689453125,
        "max_lon": 28.443433299999998808971213293261826038360595703125
    },
    "zone_id": "russia_ust_luga"
}

Methodology: 2026.01.18

Sts Ust-Luga Terminal Complex

May 4, 2026 04:19 UTC 95/100 ▼

Vessel A: Vanino (VANINO) RUSSIA

Vessel B: IMO 8724793 (KORSAKOV) RUSSIA

Minimum Distance: 14 meters
Average Distance: 23 meters
Duration: 3h 22m
Period: 2026-05-04T04:44:09+00:00 to 2026-05-04T08:06:23+00:00
Vessel A Avg Speed: 0.0 knots
Vessel B Avg Speed: 0.0 knots
Zone: Ust-Luga Terminal Complex

Confidence Analysis

Score: 95/100

High-confidence STS candidate. Two tankers (VANINO and KORSAKOV) maintained close proximity (min 14m, avg 23m) for 202 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Ust-Luga Terminal Complex, a known STS activity area.

View scoring breakdown

Factor	Score	Detail
Distance Tightness	25/25	Min distance 14m, avg 23m
Duration	25/25	Duration 202 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 Terminal Complex

Show Raw Evidence JSON

{
    "vessel_a": {
        "mmsi": 273331620,
        "imo": 8724779,
        "name": "VANINO",
        "flag": "RUSSIA"
    },
    "vessel_b": {
        "mmsi": 273353940,
        "imo": 8724793,
        "name": "KORSAKOV",
        "flag": "RUSSIA"
    },
    "min_distance_m": 14.0999999999999996447286321199499070644378662109375,
    "avg_distance_m": 22.60000000000000142108547152020037174224853515625,
    "distance_consistency_m": 1.6999999999999999555910790149937383830547332763671875,
    "duration_minutes": 202.19999999999998863131622783839702606201171875,
    "overlap_duration_s": 12134,
    "speed_a_avg": 0,
    "speed_a_std": 0,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0,
            "max_sog": 0
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-05-04T04:44:09+00:00",
        "end": "2026-05-04T08:06:23+00:00"
    },
    "points_count": {
        "vessel_a": 38,
        "vessel_b": 38
    },
    "zone_id": "russia_ust_luga",
    "zone_name": "Ust-Luga Terminal Complex",
    "score": {
        "value": 95,
        "components": {
            "distance_tightness": {
                "score": 25,
                "max": 25,
                "detail": "Min distance 14m, avg 23m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 202 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 Terminal Complex"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (VANINO and KORSAKOV) maintained close proximity (min 14m, avg 23m) for 202 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Ust-Luga Terminal Complex, a known STS activity area."
    }
}

Methodology: 2026.01.18

Zone Dwell Ust-Luga Terminal Complex

May 4, 2026 04:00 UTC 80.0% ▼

Zone: Ust-Luga Terminal Complex
Duration: 4h 7m
Data Points: 85 AIS positions
Period: 2026-05-04T04:00:38+00:00 to 2026-05-04T08:07:48+00:00

Show Raw Evidence JSON

{
    "zone_id": "russia_ust_luga",
    "zone_name": "Ust-Luga Terminal Complex",
    "dwell_minutes": 247.19999999999998863131622783839702606201171875,
    "points_in_zone": 85,
    "first_point": {
        "ts": "2026-05-04T04:00:38+00:00",
        "lat": 59.77202170000000336358425556682050228118896484375,
        "lon": 28.44341670000000021900632418692111968994140625
    },
    "last_point": {
        "ts": "2026-05-04T08:07:48+00:00",
        "lat": 59.7719967000000025336703401990234851837158203125,
        "lon": 28.443413299999999566125552519224584102630615234375
    }
}

Methodology: 2026.01.18

Loiter Ust-Luga Terminal Complex

May 4, 2026 04:00 UTC 75.0% ▼

Duration: 4h 7m
Radius: 6 meters
Data Points: 85 AIS positions
Centroid: 59.7720, 28.4434
Zone: Ust-Luga Terminal Complex

Show Raw Evidence JSON

{
    "radius_m": 5.9000000000000003552713678800500929355621337890625,
    "duration_minutes": 247.19999999999998863131622783839702606201171875,
    "points": 85,
    "centroid": {
        "lat": 59.77199635176469882935634814202785491943359375,
        "lon": 28.443396430588226309055244200862944126129150390625
    },
    "bbox": {
        "min_lat": 59.77195830000000142945282277651131153106689453125,
        "min_lon": 28.44334669999999931633283267728984355926513671875,
        "max_lat": 59.77204669999999708807081333361566066741943359375,
        "max_lon": 28.44344830000000001746229827404022216796875
    },
    "zone_id": "russia_ust_luga"
}

Methodology: 2026.01.18

Sts Ust-Luga Terminal Complex

May 4, 2026 03:03 UTC 95/100 ▼

Vessel A: Vanino (VANINO) RUSSIA

Vessel B: IMO 8724793 (KORSAKOV) RUSSIA

Minimum Distance: 14 meters
Average Distance: 23 meters
Duration: 4h 39m
Period: 2026-05-04T03:26:55+00:00 to 2026-05-04T08:06:23+00:00
Vessel A Avg Speed: 0.0 knots
Vessel B Avg Speed: 0.0 knots
Zone: Ust-Luga Terminal Complex

Confidence Analysis

Score: 95/100

High-confidence STS candidate. Two tankers (VANINO and KORSAKOV) maintained close proximity (min 14m, avg 23m) for 280 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Ust-Luga Terminal Complex, a known STS activity area.

View scoring breakdown

Factor	Score	Detail
Distance Tightness	25/25	Min distance 14m, avg 23m
Duration	25/25	Duration 280 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 Terminal Complex

Show Raw Evidence JSON

{
    "vessel_a": {
        "mmsi": 273331620,
        "imo": 8724779,
        "name": "VANINO",
        "flag": "RUSSIA"
    },
    "vessel_b": {
        "mmsi": 273353940,
        "imo": 8724793,
        "name": "KORSAKOV",
        "flag": "RUSSIA"
    },
    "min_distance_m": 14.0999999999999996447286321199499070644378662109375,
    "avg_distance_m": 22.60000000000000142108547152020037174224853515625,
    "distance_consistency_m": 1.600000000000000088817841970012523233890533447265625,
    "duration_minutes": 279.5,
    "overlap_duration_s": 16768,
    "speed_a_avg": 0,
    "speed_a_std": 0,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0,
            "max_sog": 0
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-05-04T03:26:55+00:00",
        "end": "2026-05-04T08:06:23+00:00"
    },
    "points_count": {
        "vessel_a": 52,
        "vessel_b": 52
    },
    "zone_id": "russia_ust_luga",
    "zone_name": "Ust-Luga Terminal Complex",
    "score": {
        "value": 95,
        "components": {
            "distance_tightness": {
                "score": 25,
                "max": 25,
                "detail": "Min distance 14m, avg 23m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 280 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 Terminal Complex"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (VANINO and KORSAKOV) maintained close proximity (min 14m, avg 23m) for 280 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Ust-Luga Terminal Complex, a known STS activity area."
    }
}

Methodology: 2026.01.18

Zone Dwell Ust-Luga Terminal Complex

May 4, 2026 03:00 UTC 80.0% ▼

Zone: Ust-Luga Terminal Complex
Duration: 5h 7m
Data Points: 106 AIS positions
Period: 2026-05-04T03:00:27+00:00 to 2026-05-04T08:07:48+00:00

Show Raw Evidence JSON

{
    "zone_id": "russia_ust_luga",
    "zone_name": "Ust-Luga Terminal Complex",
    "dwell_minutes": 307.3999999999999772626324556767940521240234375,
    "points_in_zone": 106,
    "first_point": {
        "ts": "2026-05-04T03:00:27+00:00",
        "lat": 59.77198829999999674100763513706624507904052734375,
        "lon": 28.4434116999999986319380695931613445281982421875
    },
    "last_point": {
        "ts": "2026-05-04T08:07:48+00:00",
        "lat": 59.7719967000000025336703401990234851837158203125,
        "lon": 28.443413299999999566125552519224584102630615234375
    }
}

Methodology: 2026.01.18

Loiter Ust-Luga Terminal Complex

May 4, 2026 03:00 UTC 75.0% ▼

Duration: 5h 7m
Radius: 6 meters
Data Points: 106 AIS positions
Centroid: 59.7720, 28.4434
Zone: Ust-Luga Terminal Complex

Show Raw Evidence JSON

{
    "radius_m": 5.5999999999999996447286321199499070644378662109375,
    "duration_minutes": 307.3999999999999772626324556767940521240234375,
    "points": 106,
    "centroid": {
        "lat": 59.7719983943396329095776309259235858917236328125,
        "lon": 28.443398945283007606121827848255634307861328125
    },
    "bbox": {
        "min_lat": 59.77195830000000142945282277651131153106689453125,
        "min_lon": 28.44334669999999931633283267728984355926513671875,
        "max_lat": 59.77204669999999708807081333361566066741943359375,
        "max_lon": 28.44344830000000001746229827404022216796875
    },
    "zone_id": "russia_ust_luga"
}

Methodology: 2026.01.18

Sts Ust-Luga Terminal Complex

May 4, 2026 02:05 UTC 95/100 ▼

Vessel A: Vanino (VANINO) RUSSIA

Vessel B: IMO 8724793 (KORSAKOV) RUSSIA

Minimum Distance: 14 meters
Average Distance: 22 meters
Duration: 5h 15m
Period: 2026-05-04T02:50:55+00:00 to 2026-05-04T08:06:23+00:00
Vessel A Avg Speed: 0.0 knots
Vessel B Avg Speed: 0.0 knots
Zone: Ust-Luga Terminal Complex

Confidence Analysis

Score: 95/100

High-confidence STS candidate. Two tankers (VANINO and KORSAKOV) maintained close proximity (min 14m, avg 22m) for 316 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Ust-Luga Terminal Complex, a known STS activity area.

View scoring breakdown

Factor	Score	Detail
Distance Tightness	25/25	Min distance 14m, avg 22m
Duration	25/25	Duration 316 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 Terminal Complex

Show Raw Evidence JSON

{
    "vessel_a": {
        "mmsi": 273331620,
        "imo": 8724779,
        "name": "VANINO",
        "flag": "RUSSIA"
    },
    "vessel_b": {
        "mmsi": 273353940,
        "imo": 8724793,
        "name": "KORSAKOV",
        "flag": "RUSSIA"
    },
    "min_distance_m": 14.0999999999999996447286321199499070644378662109375,
    "avg_distance_m": 22.199999999999999289457264239899814128875732421875,
    "distance_consistency_m": 1.8000000000000000444089209850062616169452667236328125,
    "duration_minutes": 315.5,
    "overlap_duration_s": 18928,
    "speed_a_avg": 0,
    "speed_a_std": 0,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0,
            "max_sog": 0
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-05-04T02:50:55+00:00",
        "end": "2026-05-04T08:06:23+00:00"
    },
    "points_count": {
        "vessel_a": 62,
        "vessel_b": 62
    },
    "zone_id": "russia_ust_luga",
    "zone_name": "Ust-Luga Terminal Complex",
    "score": {
        "value": 95,
        "components": {
            "distance_tightness": {
                "score": 25,
                "max": 25,
                "detail": "Min distance 14m, avg 22m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 316 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 Terminal Complex"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (VANINO and KORSAKOV) maintained close proximity (min 14m, avg 22m) for 316 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Ust-Luga Terminal Complex, a known STS activity area."
    }
}

Methodology: 2026.01.18

Zone Dwell Ust-Luga Terminal Complex

May 4, 2026 02:02 UTC 80.0% ▼

Zone: Ust-Luga Terminal Complex
Duration: 6h 5m
Data Points: 124 AIS positions
Period: 2026-05-04T02:02:38+00:00 to 2026-05-04T08:07:48+00:00

Show Raw Evidence JSON

{
    "zone_id": "russia_ust_luga",
    "zone_name": "Ust-Luga Terminal Complex",
    "dwell_minutes": 365.19999999999998863131622783839702606201171875,
    "points_in_zone": 124,
    "first_point": {
        "ts": "2026-05-04T02:02:38+00:00",
        "lat": 59.77198829999999674100763513706624507904052734375,
        "lon": 28.443425000000001290345608140341937541961669921875
    },
    "last_point": {
        "ts": "2026-05-04T08:07:48+00:00",
        "lat": 59.7719967000000025336703401990234851837158203125,
        "lon": 28.443413299999999566125552519224584102630615234375
    }
}

Methodology: 2026.01.18

Loiter Ust-Luga Terminal Complex

May 4, 2026 02:02 UTC 75.0% ▼

Duration: 6h 5m
Radius: 9 meters
Data Points: 124 AIS positions
Centroid: 59.7720, 28.4434
Zone: Ust-Luga Terminal Complex

Show Raw Evidence JSON

{
    "radius_m": 8.5999999999999996447286321199499070644378662109375,
    "duration_minutes": 365.19999999999998863131622783839702606201171875,
    "points": 124,
    "centroid": {
        "lat": 59.77199569838711568081635050475597381591796875,
        "lon": 28.443402591935484480245577287860214710235595703125
    },
    "bbox": {
        "min_lat": 59.77192170000000004392859409563243389129638671875,
        "min_lon": 28.44334669999999931633283267728984355926513671875,
        "max_lat": 59.77204669999999708807081333361566066741943359375,
        "max_lon": 28.44344830000000001746229827404022216796875
    },
    "zone_id": "russia_ust_luga"
}

Methodology: 2026.01.18

Sts🛰️? Ust-Luga Terminal Complex

May 4, 2026 01:03 UTC 95/100 ▼

Vessel A: IMO 8724793 (KORSAKOV) RUSSIA

Vessel B: Vanino (VANINO) RUSSIA

Minimum Distance: 15 meters
Average Distance: 20 meters
Duration: 3h 1m
Period: 2026-05-04T01:03:47+00:00 to 2026-05-04T04:04:48+00:00
Vessel A Avg Speed: 0.0 knots
Vessel B Avg Speed: 0.0 knots
Zone: Ust-Luga Terminal Complex

Confidence Analysis

Score: 95/100

High-confidence STS candidate. Two tankers (KORSAKOV and VANINO) maintained close proximity (min 15m, avg 20m) for 181 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Ust-Luga Terminal Complex, a known STS activity area.

View scoring breakdown

Factor	Score	Detail
Distance Tightness	25/25	Min distance 15m, avg 20m
Duration	25/25	Duration 181 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 Terminal Complex

🛰️ Satellite Corroboration

? SAR Inconclusive

Satellite imagery available but requires review

Preview available for manual review

Scene: S1C_EW_GRDM_1SDH_20260504T044051_20260504T044151_007499_00F398_3E10_COG • Acquired: 2026-05-04T04:40:51.268359Z • Platform: sentinel-1c

Click image to view full size

Searched: 2026-05-04T07:45:07.004083+00:00

{
    "vessel_a": {
        "mmsi": 273353940,
        "imo": 8724793,
        "name": "KORSAKOV",
        "flag": "RUSSIA"
    },
    "vessel_b": {
        "mmsi": 273331620,
        "imo": 8724779,
        "name": "VANINO",
        "flag": "RUSSIA"
    },
    "min_distance_m": 14.5999999999999996447286321199499070644378662109375,
    "avg_distance_m": 20.199999999999999289457264239899814128875732421875,
    "distance_consistency_m": 1.899999999999999911182158029987476766109466552734375,
    "duration_minutes": 181,
    "overlap_duration_s": 10861,
    "speed_a_avg": 0,
    "speed_a_std": 0.0200000000000000004163336342344337026588618755340576171875,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0,
            "max_sog": 0.1000000000000000055511151231257827021181583404541015625
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-05-04T01:03:47+00:00",
        "end": "2026-05-04T04:04:48+00:00"
    },
    "points_count": {
        "vessel_a": 62,
        "vessel_b": 62
    },
    "zone_id": "russia_ust_luga",
    "zone_name": "Ust-Luga Terminal Complex",
    "score": {
        "value": 95,
        "components": {
            "distance_tightness": {
                "score": 25,
                "max": 25,
                "detail": "Min distance 15m, avg 20m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 181 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 Terminal Complex"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (KORSAKOV and VANINO) maintained close proximity (min 15m, avg 20m) for 181 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Ust-Luga Terminal Complex, a known STS activity area."
    },
    "sar": {
        "status": "inconclusive",
        "centroid": {
            "lat": 59.77193890000000209283825824968516826629638671875,
            "lon": 28.443556799999999640249370713718235492706298828125
        },
        "time_window": {
            "start_ts": "2026-05-04T01:03:47+00:00",
            "end_ts": "2026-05-04T04:04:48+00:00"
        },
        "searched_at": "2026-05-04T07:45:07.004083+00:00",
        "scene_id": "S1C_EW_GRDM_1SDH_20260504T044051_20260504T044151_007499_00F398_3E10_COG",
        "scene_datetime": "2026-05-04T04:40:51.268359Z",
        "platform": "sentinel-1c",
        "bbox": {
            "min_lon": 21.9211600000000004229150363244116306304931640625,
            "min_lat": 58.01894800000000174122760654427111148834228515625,
            "max_lon": 30.81303199999999975489117787219583988189697265625,
            "max_lat": 62.32932699999999925921656540594995021820068359375
        },
        "assets": {
            "preview_url": "https:\/\/fleetleaks.com\/wp-content\/uploads\/fleetleaks-evidence\/sar-imagery\/2026\/05\/event_482629_thumbnail_20260504074510.png",
            "stored_path": "\/home\/fleetleaks\/public_html\/wp-content\/uploads\/fleetleaks-evidence\/sar-imagery\/2026\/05\/event_482629_thumbnail_20260504074510.png",
            "source": "copernicus_dataspace"
        },
        "notes": "Preview available for manual review"
    }
}

May 4, 2026 01:00 UTC 80.0% ▼

Zone: Ust-Luga Terminal Complex
Duration: 6h 35m
Data Points: 134 AIS positions
Period: 2026-05-04T01:32:47+00:00 to 2026-05-04T08:07:48+00:00

{
    "zone_id": "russia_ust_luga",
    "zone_name": "Ust-Luga Terminal Complex",
    "dwell_minutes": 395,
    "points_in_zone": 134,
    "first_point": {
        "ts": "2026-05-04T01:32:47+00:00",
        "lat": 59.77198829999999674100763513706624507904052734375,
        "lon": 28.443365000000000009094947017729282379150390625
    },
    "last_point": {
        "ts": "2026-05-04T08:07:48+00:00",
        "lat": 59.7719967000000025336703401990234851837158203125,
        "lon": 28.443413299999999566125552519224584102630615234375
    }
}

May 4, 2026 01:00 UTC 75.0% ▼

Duration: 6h 35m
Radius: 9 meters
Data Points: 134 AIS positions
Centroid: 59.7720, 28.4434
Zone: Ust-Luga Terminal Complex

{
    "radius_m": 8.5999999999999996447286321199499070644378662109375,
    "duration_minutes": 395,
    "points": 134,
    "centroid": {
        "lat": 59.77199518582090576046539354138076305389404296875,
        "lon": 28.443403194029855285407393239438533782958984375
    },
    "bbox": {
        "min_lat": 59.77192170000000004392859409563243389129638671875,
        "min_lon": 28.44334669999999931633283267728984355926513671875,
        "max_lat": 59.77204669999999708807081333361566066741943359375,
        "max_lon": 28.44344830000000001746229827404022216796875
    },
    "zone_id": "russia_ust_luga"
}

Sts Ust-Luga Terminal Complex

May 4, 2026 00:06 UTC 95/100 ▼

Vessel A: Vanino (VANINO) RUSSIA

Vessel B: IMO 8724793 (KORSAKOV) RUSSIA

Minimum Distance: 14 meters
Average Distance: 21 meters
Duration: 6h 30m
Period: 2026-05-04T00:26:18+00:00 to 2026-05-04T06:56:53+00:00
Vessel A Avg Speed: 0.0 knots
Vessel B Avg Speed: 0.0 knots
Zone: Ust-Luga Terminal Complex

Confidence Analysis

Score: 95/100

High-confidence STS candidate. Two tankers (VANINO and KORSAKOV) maintained close proximity (min 14m, avg 21m) for 391 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Ust-Luga Terminal Complex, a known STS activity area.

View scoring breakdown

Factor	Score	Detail
Distance Tightness	25/25	Min distance 14m, avg 21m
Duration	25/25	Duration 391 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 Terminal Complex

Show Raw Evidence JSON

{
    "vessel_a": {
        "mmsi": 273331620,
        "imo": 8724779,
        "name": "VANINO",
        "flag": "RUSSIA"
    },
    "vessel_b": {
        "mmsi": 273353940,
        "imo": 8724793,
        "name": "KORSAKOV",
        "flag": "RUSSIA"
    },
    "min_distance_m": 14.0999999999999996447286321199499070644378662109375,
    "avg_distance_m": 21.300000000000000710542735760100185871124267578125,
    "distance_consistency_m": 1.899999999999999911182158029987476766109466552734375,
    "duration_minutes": 390.6000000000000227373675443232059478759765625,
    "overlap_duration_s": 23435,
    "speed_a_avg": 0,
    "speed_a_std": 0,
    "speed_b_avg": 0,
    "speed_b_std": 0.0200000000000000004163336342344337026588618755340576171875,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0,
            "max_sog": 0
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0.1000000000000000055511151231257827021181583404541015625
        }
    },
    "time_window": {
        "start": "2026-05-04T00:26:18+00:00",
        "end": "2026-05-04T06:56:53+00:00"
    },
    "points_count": {
        "vessel_a": 80,
        "vessel_b": 80
    },
    "zone_id": "russia_ust_luga",
    "zone_name": "Ust-Luga Terminal Complex",
    "score": {
        "value": 95,
        "components": {
            "distance_tightness": {
                "score": 25,
                "max": 25,
                "detail": "Min distance 14m, avg 21m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 391 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 Terminal Complex"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (VANINO and KORSAKOV) maintained close proximity (min 14m, avg 21m) for 391 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Ust-Luga Terminal Complex, a known STS activity area."
    }
}

Methodology: 2026.01.18

Zone Dwell Ust-Luga Terminal Complex

May 4, 2026 00:00 UTC 80.0% ▼

Zone: Ust-Luga Terminal Complex
Duration: 6h 34m
Data Points: 135 AIS positions
Period: 2026-05-04T00:51:27+00:00 to 2026-05-04T07:25:48+00:00

Show Raw Evidence JSON

{
    "zone_id": "russia_ust_luga",
    "zone_name": "Ust-Luga Terminal Complex",
    "dwell_minutes": 394.3999999999999772626324556767940521240234375,
    "points_in_zone": 135,
    "first_point": {
        "ts": "2026-05-04T00:51:27+00:00",
        "lat": 59.7719799999999992223820299841463565826416015625,
        "lon": 28.443413299999999566125552519224584102630615234375
    },
    "last_point": {
        "ts": "2026-05-04T07:25:48+00:00",
        "lat": 59.77199170000000094660208560526371002197265625,
        "lon": 28.443418300000001153193807112984359264373779296875
    }
}

Methodology: 2026.01.18

Loiter Ust-Luga Terminal Complex

May 4, 2026 00:00 UTC 75.0% ▼

Duration: 6h 34m
Radius: 9 meters
Data Points: 135 AIS positions
Centroid: 59.7720, 28.4434
Zone: Ust-Luga Terminal Complex

Show Raw Evidence JSON

{
    "radius_m": 8.5,
    "duration_minutes": 394.3999999999999772626324556767940521240234375,
    "points": 135,
    "centroid": {
        "lat": 59.77199433185186450145920389331877231597900390625,
        "lon": 28.4434031711111146023540641181170940399169921875
    },
    "bbox": {
        "min_lat": 59.77192170000000004392859409563243389129638671875,
        "min_lon": 28.44334669999999931633283267728984355926513671875,
        "max_lat": 59.77204669999999708807081333361566066741943359375,
        "max_lon": 28.44344830000000001746229827404022216796875
    },
    "zone_id": "russia_ust_luga"
}

Methodology: 2026.01.18

Sts🛰️? Ust-Luga Terminal Complex

May 3, 2026 23:03 UTC 95/100 ▼

Vessel A: IMO 8724793 (KORSAKOV) RUSSIA

Vessel B: Vanino (VANINO) RUSSIA

Minimum Distance: 15 meters
Average Distance: 21 meters
Duration: 5h 1m
Period: 2026-05-03T23:03:28+00:00 to 2026-05-04T04:04:48+00:00
Vessel A Avg Speed: 0.0 knots
Vessel B Avg Speed: 0.0 knots
Zone: Ust-Luga Terminal Complex

Confidence Analysis

Score: 95/100

High-confidence STS candidate. Two tankers (KORSAKOV and VANINO) maintained close proximity (min 15m, avg 21m) for 301 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Ust-Luga Terminal Complex, a known STS activity area.

View scoring breakdown

Factor	Score	Detail
Distance Tightness	25/25	Min distance 15m, avg 21m
Duration	25/25	Duration 301 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 Terminal Complex

🛰️ Satellite Corroboration

? SAR Inconclusive

Satellite imagery available but requires review

Preview available for manual review

Scene: S1C_EW_GRDM_1SDH_20260504T044051_20260504T044151_007499_00F398_3E10_COG • Acquired: 2026-05-04T04:40:51.268359Z • Platform: sentinel-1c

Click image to view full size

Searched: 2026-05-04T05:45:05.429791+00:00

{
    "vessel_a": {
        "mmsi": 273353940,
        "imo": 8724793,
        "name": "KORSAKOV",
        "flag": "RUSSIA"
    },
    "vessel_b": {
        "mmsi": 273331620,
        "imo": 8724779,
        "name": "VANINO",
        "flag": "RUSSIA"
    },
    "min_distance_m": 14.5999999999999996447286321199499070644378662109375,
    "avg_distance_m": 20.60000000000000142108547152020037174224853515625,
    "distance_consistency_m": 1.600000000000000088817841970012523233890533447265625,
    "duration_minutes": 301.30000000000001136868377216160297393798828125,
    "overlap_duration_s": 18080,
    "speed_a_avg": 0,
    "speed_a_std": 0.0200000000000000004163336342344337026588618755340576171875,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0,
            "max_sog": 0.1000000000000000055511151231257827021181583404541015625
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-05-03T23:03:28+00:00",
        "end": "2026-05-04T04:04:48+00:00"
    },
    "points_count": {
        "vessel_a": 104,
        "vessel_b": 104
    },
    "zone_id": "russia_ust_luga",
    "zone_name": "Ust-Luga Terminal Complex",
    "score": {
        "value": 95,
        "components": {
            "distance_tightness": {
                "score": 25,
                "max": 25,
                "detail": "Min distance 15m, avg 21m"
            },
            "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": 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 Terminal Complex"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (KORSAKOV and VANINO) maintained close proximity (min 15m, avg 21m) for 301 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Ust-Luga Terminal Complex, a known STS activity area."
    },
    "sar": {
        "status": "inconclusive",
        "centroid": {
            "lat": 59.77193849999999741839928901754319667816162109375,
            "lon": 28.44355829999999940582711133174598217010498046875
        },
        "time_window": {
            "start_ts": "2026-05-03T23:03:28+00:00",
            "end_ts": "2026-05-04T04:04:48+00:00"
        },
        "searched_at": "2026-05-04T05:45:05.429791+00:00",
        "scene_id": "S1C_EW_GRDM_1SDH_20260504T044051_20260504T044151_007499_00F398_3E10_COG",
        "scene_datetime": "2026-05-04T04:40:51.268359Z",
        "platform": "sentinel-1c",
        "bbox": {
            "min_lon": 21.9211600000000004229150363244116306304931640625,
            "min_lat": 58.01894800000000174122760654427111148834228515625,
            "max_lon": 30.81303199999999975489117787219583988189697265625,
            "max_lat": 62.32932699999999925921656540594995021820068359375
        },
        "assets": {
            "preview_url": "https:\/\/fleetleaks.com\/wp-content\/uploads\/fleetleaks-evidence\/sar-imagery\/2026\/05\/event_482225_thumbnail_20260504054509.png",
            "stored_path": "\/home\/fleetleaks\/public_html\/wp-content\/uploads\/fleetleaks-evidence\/sar-imagery\/2026\/05\/event_482225_thumbnail_20260504054509.png",
            "source": "copernicus_dataspace"
        },
        "notes": "Preview available for manual review"
    }
}

May 3, 2026 23:00 UTC 80.0% ▼

Zone: Ust-Luga Terminal Complex
Duration: 6h 37m
Data Points: 137 AIS positions
Period: 2026-05-03T23:51:28+00:00 to 2026-05-04T06:28:48+00:00

{
    "zone_id": "russia_ust_luga",
    "zone_name": "Ust-Luga Terminal Complex",
    "dwell_minutes": 397.30000000000001136868377216160297393798828125,
    "points_in_zone": 137,
    "first_point": {
        "ts": "2026-05-03T23:51:28+00:00",
        "lat": 59.77201170000000018944774637930095195770263671875,
        "lon": 28.443413299999999566125552519224584102630615234375
    },
    "last_point": {
        "ts": "2026-05-04T06:28:48+00:00",
        "lat": 59.7719749999999976353137753903865814208984375,
        "lon": 28.44337829999999911478880676440894603729248046875
    }
}

May 3, 2026 23:00 UTC 75.0% ▼

Duration: 6h 37m
Radius: 9 meters
Data Points: 137 AIS positions
Centroid: 59.7720, 28.4434
Zone: Ust-Luga Terminal Complex

{
    "radius_m": 8.5,
    "duration_minutes": 397.30000000000001136868377216160297393798828125,
    "points": 137,
    "centroid": {
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        "lon": 28.443405058394166218249665689654648303985595703125
    },
    "bbox": {
        "min_lat": 59.77192170000000004392859409563243389129638671875,
        "min_lon": 28.44334669999999931633283267728984355926513671875,
        "max_lat": 59.77204669999999708807081333361566066741943359375,
        "max_lon": 28.44344830000000001746229827404022216796875
    },
    "zone_id": "russia_ust_luga"
}

May 3, 2026 22:00 UTC 80.0% ▼

Zone: Ust-Luga Terminal Complex
Duration: 6h 39m
Data Points: 139 AIS positions
Period: 2026-05-03T22:50:07+00:00 to 2026-05-04T05:29:58+00:00

{
    "zone_id": "russia_ust_luga",
    "zone_name": "Ust-Luga Terminal Complex",
    "dwell_minutes": 399.8999999999999772626324556767940521240234375,
    "points_in_zone": 139,
    "first_point": {
        "ts": "2026-05-03T22:50:07+00:00",
        "lat": 59.77198829999999674100763513706624507904052734375,
        "lon": 28.4434083000000015317709767259657382965087890625
    },
    "last_point": {
        "ts": "2026-05-04T05:29:58+00:00",
        "lat": 59.7719866999999993595338310115039348602294921875,
        "lon": 28.443394999999998873363438178785145282745361328125
    }
}

May 3, 2026 22:00 UTC 75.0% ▼

Duration: 6h 39m
Radius: 9 meters
Data Points: 139 AIS positions
Centroid: 59.7720, 28.4434
Zone: Ust-Luga Terminal Complex

{
    "radius_m": 8.699999999999999289457264239899814128875732421875,
    "duration_minutes": 399.8999999999999772626324556767940521240234375,
    "points": 139,
    "centroid": {
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        "lon": 28.443410021582725022426529903896152973175048828125
    },
    "bbox": {
        "min_lat": 59.77192170000000004392859409563243389129638671875,
        "min_lon": 28.44334669999999931633283267728984355926513671875,
        "max_lat": 59.77204669999999708807081333361566066741943359375,
        "max_lon": 28.44344830000000001746229827404022216796875
    },
    "zone_id": "russia_ust_luga"
}