Intelligence Feed - FleetLeaks

IMO 9043794

Vessel information

Vessel Name PERSEY

IMO Number 9043794

MMSI 273358480

Vessel Type Tanker

Flag 🇷🇺 RUSSIA

Call Sign UBDJ8

Length 112 m

Beam 18 m

Detected Events (100)

Zone Dwell Prigorodnoye/Sakhalin LNG

Jun 4, 2026 08:02 UTC 80.0% ▼

Zone: Prigorodnoye/Sakhalin LNG
Duration: 1h 7m
Data Points: 17 AIS positions
Period: 2026-06-04T08:02:24+00:00 to 2026-06-04T09:09:24+00:00

Show Raw Evidence JSON

{
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "dwell_minutes": 67,
    "points_in_zone": 17,
    "first_point": {
        "ts": "2026-06-04T08:02:24+00:00",
        "lat": 46.39809670000000352274582837708294391632080078125,
        "lon": 142.73222670000001244261511601507663726806640625
    },
    "last_point": {
        "ts": "2026-06-04T09:09:24+00:00",
        "lat": 46.2404183000000017500497051514685153961181640625,
        "lon": 142.847524999999990313881426118314266204833984375
    }
}

Methodology: 2026.01.18

Zone Dwell Sakhalin South Approach

Jun 4, 2026 08:02 UTC 80.0% ▼

Zone: Sakhalin South Approach
Duration: 1h 7m
Data Points: 17 AIS positions
Period: 2026-06-04T08:02:24+00:00 to 2026-06-04T09:09:24+00:00

Show Raw Evidence JSON

{
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "dwell_minutes": 67,
    "points_in_zone": 17,
    "first_point": {
        "ts": "2026-06-04T08:02:24+00:00",
        "lat": 46.39809670000000352274582837708294391632080078125,
        "lon": 142.73222670000001244261511601507663726806640625
    },
    "last_point": {
        "ts": "2026-06-04T09:09:24+00:00",
        "lat": 46.2404183000000017500497051514685153961181640625,
        "lon": 142.847524999999990313881426118314266204833984375
    }
}

Methodology: 2026.01.18

Zone Dwell Prigorodnoye/Sakhalin LNG

Jun 4, 2026 07:00 UTC 80.0% ▼

Zone: Prigorodnoye/Sakhalin LNG
Duration: 2h 8m
Data Points: 32 AIS positions
Period: 2026-06-04T07:00:54+00:00 to 2026-06-04T09:09:24+00:00

Show Raw Evidence JSON

{
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "dwell_minutes": 128.5,
    "points_in_zone": 32,
    "first_point": {
        "ts": "2026-06-04T07:00:54+00:00",
        "lat": 46.3976200000000034151526051573455333709716796875,
        "lon": 142.73142999999998892235453240573406219482421875
    },
    "last_point": {
        "ts": "2026-06-04T09:09:24+00:00",
        "lat": 46.2404183000000017500497051514685153961181640625,
        "lon": 142.847524999999990313881426118314266204833984375
    }
}

Methodology: 2026.01.18

Zone Dwell Sakhalin South Approach

Jun 4, 2026 07:00 UTC 80.0% ▼

Zone: Sakhalin South Approach
Duration: 2h 8m
Data Points: 32 AIS positions
Period: 2026-06-04T07:00:54+00:00 to 2026-06-04T09:09:24+00:00

Show Raw Evidence JSON

{
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "dwell_minutes": 128.5,
    "points_in_zone": 32,
    "first_point": {
        "ts": "2026-06-04T07:00:54+00:00",
        "lat": 46.3976200000000034151526051573455333709716796875,
        "lon": 142.73142999999998892235453240573406219482421875
    },
    "last_point": {
        "ts": "2026-06-04T09:09:24+00:00",
        "lat": 46.2404183000000017500497051514685153961181640625,
        "lon": 142.847524999999990313881426118314266204833984375
    }
}

Methodology: 2026.01.18

Zone Dwell Sakhalin South Approach

Jun 4, 2026 06:06 UTC 80.0% ▼

Zone: Sakhalin South Approach
Duration: 3h 3m
Data Points: 50 AIS positions
Period: 2026-06-04T06:06:13+00:00 to 2026-06-04T09:09:24+00:00

Show Raw Evidence JSON

{
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "dwell_minutes": 183.19999999999998863131622783839702606201171875,
    "points_in_zone": 50,
    "first_point": {
        "ts": "2026-06-04T06:06:13+00:00",
        "lat": 46.39736169999999759738784632645547389984130859375,
        "lon": 142.731603299999989076241035945713520050048828125
    },
    "last_point": {
        "ts": "2026-06-04T09:09:24+00:00",
        "lat": 46.2404183000000017500497051514685153961181640625,
        "lon": 142.847524999999990313881426118314266204833984375
    }
}

Methodology: 2026.01.18

Zone Dwell Prigorodnoye/Sakhalin LNG

Jun 4, 2026 06:06 UTC 80.0% ▼

Zone: Prigorodnoye/Sakhalin LNG
Duration: 3h 3m
Data Points: 50 AIS positions
Period: 2026-06-04T06:06:13+00:00 to 2026-06-04T09:09:24+00:00

Show Raw Evidence JSON

{
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "dwell_minutes": 183.19999999999998863131622783839702606201171875,
    "points_in_zone": 50,
    "first_point": {
        "ts": "2026-06-04T06:06:13+00:00",
        "lat": 46.39736169999999759738784632645547389984130859375,
        "lon": 142.731603299999989076241035945713520050048828125
    },
    "last_point": {
        "ts": "2026-06-04T09:09:24+00:00",
        "lat": 46.2404183000000017500497051514685153961181640625,
        "lon": 142.847524999999990313881426118314266204833984375
    }
}

Methodology: 2026.01.18

Loiter Prigorodnoye/Sakhalin LNG

Jun 4, 2026 06:06 UTC 75.0% ▼

Duration: 2h 3m
Radius: 1,003 meters
Data Points: 37 AIS positions
Centroid: 46.3973, 142.7319
Zone: Prigorodnoye/Sakhalin LNG

Show Raw Evidence JSON

{
    "radius_m": 1002.6000000000000227373675443232059478759765625,
    "duration_minutes": 123,
    "points": 37,
    "centroid": {
        "lat": 46.397287070270266440275008790194988250732421875,
        "lon": 142.7319391972972653093165718019008636474609375
    },
    "bbox": {
        "min_lat": 46.38975669999999951187419355846941471099853515625,
        "min_lon": 142.731081700000004275352694094181060791015625,
        "max_lat": 46.39809670000000352274582837708294391632080078125,
        "max_lon": 142.739113300000013850876712240278720855712890625
    },
    "zone_id": "russia_prigorodnoye"
}

Methodology: 2026.01.18

Loiter Sakhalin South Approach

Jun 4, 2026 06:06 UTC 75.0% ▼

Duration: 2h 3m
Radius: 1,003 meters
Data Points: 37 AIS positions
Centroid: 46.3973, 142.7319
Zone: Sakhalin South Approach

Show Raw Evidence JSON

{
    "radius_m": 1002.6000000000000227373675443232059478759765625,
    "duration_minutes": 123,
    "points": 37,
    "centroid": {
        "lat": 46.397287070270266440275008790194988250732421875,
        "lon": 142.7319391972972653093165718019008636474609375
    },
    "bbox": {
        "min_lat": 46.38975669999999951187419355846941471099853515625,
        "min_lon": 142.731081700000004275352694094181060791015625,
        "max_lat": 46.39809670000000352274582837708294391632080078125,
        "max_lon": 142.739113300000013850876712240278720855712890625
    },
    "zone_id": "russia_sakhalin_south"
}

Methodology: 2026.01.18

Zone Dwell Sakhalin South Approach

Jun 4, 2026 05:00 UTC 80.0% ▼

Zone: Sakhalin South Approach
Duration: 4h 8m
Data Points: 69 AIS positions
Period: 2026-06-04T05:00:32+00:00 to 2026-06-04T09:09:24+00:00

Show Raw Evidence JSON

{
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "dwell_minutes": 248.900000000000005684341886080801486968994140625,
    "points_in_zone": 69,
    "first_point": {
        "ts": "2026-06-04T05:00:32+00:00",
        "lat": 46.39744170000000167419784702360630035400390625,
        "lon": 142.7316266999999925246811471879482269287109375
    },
    "last_point": {
        "ts": "2026-06-04T09:09:24+00:00",
        "lat": 46.2404183000000017500497051514685153961181640625,
        "lon": 142.847524999999990313881426118314266204833984375
    }
}

Methodology: 2026.01.18

Zone Dwell Prigorodnoye/Sakhalin LNG

Jun 4, 2026 05:00 UTC 80.0% ▼

Zone: Prigorodnoye/Sakhalin LNG
Duration: 4h 8m
Data Points: 69 AIS positions
Period: 2026-06-04T05:00:32+00:00 to 2026-06-04T09:09:24+00:00

Show Raw Evidence JSON

{
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "dwell_minutes": 248.900000000000005684341886080801486968994140625,
    "points_in_zone": 69,
    "first_point": {
        "ts": "2026-06-04T05:00:32+00:00",
        "lat": 46.39744170000000167419784702360630035400390625,
        "lon": 142.7316266999999925246811471879482269287109375
    },
    "last_point": {
        "ts": "2026-06-04T09:09:24+00:00",
        "lat": 46.2404183000000017500497051514685153961181640625,
        "lon": 142.847524999999990313881426118314266204833984375
    }
}

Methodology: 2026.01.18

Loiter Prigorodnoye/Sakhalin LNG

Jun 4, 2026 05:00 UTC 75.0% ▼

Duration: 3h 8m
Radius: 1,010 meters
Data Points: 56 AIS positions
Centroid: 46.3973, 142.7318
Zone: Prigorodnoye/Sakhalin LNG

Show Raw Evidence JSON

{
    "radius_m": 1010,
    "duration_minutes": 188.69999999999998863131622783839702606201171875,
    "points": 56,
    "centroid": {
        "lat": 46.39732184464285325020682648755609989166259765625,
        "lon": 142.73183977142861067477497272193431854248046875
    },
    "bbox": {
        "min_lat": 46.38975669999999951187419355846941471099853515625,
        "min_lon": 142.731081700000004275352694094181060791015625,
        "max_lat": 46.39809670000000352274582837708294391632080078125,
        "max_lon": 142.739113300000013850876712240278720855712890625
    },
    "zone_id": "russia_prigorodnoye"
}

Methodology: 2026.01.18

Loiter Sakhalin South Approach

Jun 4, 2026 05:00 UTC 75.0% ▼

Duration: 3h 8m
Radius: 1,010 meters
Data Points: 56 AIS positions
Centroid: 46.3973, 142.7318
Zone: Sakhalin South Approach

Show Raw Evidence JSON

{
    "radius_m": 1010,
    "duration_minutes": 188.69999999999998863131622783839702606201171875,
    "points": 56,
    "centroid": {
        "lat": 46.39732184464285325020682648755609989166259765625,
        "lon": 142.73183977142861067477497272193431854248046875
    },
    "bbox": {
        "min_lat": 46.38975669999999951187419355846941471099853515625,
        "min_lon": 142.731081700000004275352694094181060791015625,
        "max_lat": 46.39809670000000352274582837708294391632080078125,
        "max_lon": 142.739113300000013850876712240278720855712890625
    },
    "zone_id": "russia_sakhalin_south"
}

Methodology: 2026.01.18

Sts🛰️? Prigorodnoye/Sakhalin LNG

Jun 4, 2026 04:14 UTC 95/100 ▼

Vessel A: IMO 9004310 (ORIS) TOGO

Vessel B: IMO 9043794 (PERSEY) RUSSIA

Minimum Distance: 15 meters
Average Distance: 25 meters
Duration: 3h 54m
Period: 2026-06-04T04:14:50+00:00 to 2026-06-04T08:08:53+00:00
Vessel A Avg Speed: 0.2 knots
Vessel B Avg Speed: 0.2 knots
Zone: Prigorodnoye/Sakhalin LNG

Confidence Analysis

Score: 95/100

High-confidence STS candidate. Two tankers (ORIS and PERSEY) maintained close proximity (min 15m, avg 25m) for 234 minutes. Both vessels were slow-moving (avg speeds 0.2 and 0.2 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Prigorodnoye/Sakhalin LNG, a known STS activity area.

View scoring breakdown

Factor	Score	Detail
Distance Tightness	25/25	Min distance 15m, avg 25m
Duration	25/25	Duration 234 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: Prigorodnoye/Sakhalin LNG

🛰️ Satellite Corroboration

? SAR Inconclusive

Satellite imagery available but requires review

Preview available for manual review

Scene: S1A_IW_GRDH_1SDV_20260604T082021_20260604T082050_064817_082AC3_F61D_COG • Acquired: 2026-06-04T08:20:21.643366Z • Platform: sentinel-1a

Click image to view full size

Searched: 2026-06-04T13:15:20.477364+00:00

Show Raw Evidence JSON

{
    "vessel_a": {
        "mmsi": 671388100,
        "imo": 9004310,
        "name": "ORIS",
        "flag": "TOGO"
    },
    "vessel_b": {
        "mmsi": 273358480,
        "imo": 9043794,
        "name": "PERSEY",
        "flag": "RUSSIA"
    },
    "min_distance_m": 15.300000000000000710542735760100185871124267578125,
    "avg_distance_m": 24.60000000000000142108547152020037174224853515625,
    "distance_consistency_m": 11.5,
    "duration_minutes": 234.099999999999994315658113919198513031005859375,
    "overlap_duration_s": 14043,
    "speed_a_avg": 0.2300000000000000099920072216264088638126850128173828125,
    "speed_a_std": 0.11999999999999999555910790149937383830547332763671875,
    "speed_b_avg": 0.1700000000000000122124532708767219446599483489990234375,
    "speed_b_std": 0.059999999999999997779553950749686919152736663818359375,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.2300000000000000099920072216264088638126850128173828125,
            "max_sog": 0.299999999999999988897769753748434595763683319091796875
        },
        "vessel_b": {
            "avg_sog": 0.1700000000000000122124532708767219446599483489990234375,
            "max_sog": 0.200000000000000011102230246251565404236316680908203125
        }
    },
    "time_window": {
        "start": "2026-06-04T04:14:50+00:00",
        "end": "2026-06-04T08:08:53+00:00"
    },
    "points_count": {
        "vessel_a": 3,
        "vessel_b": 3
    },
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "score": {
        "value": 95,
        "components": {
            "distance_tightness": {
                "score": 25,
                "max": 25,
                "detail": "Min distance 15m, avg 25m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 234 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b112m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Prigorodnoye\/Sakhalin LNG"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (ORIS and PERSEY) maintained close proximity (min 15m, avg 25m) for 234 minutes. Both vessels were slow-moving (avg speeds 0.2 and 0.2 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Prigorodnoye\/Sakhalin LNG, a known STS activity area."
    },
    "sar": {
        "status": "inconclusive",
        "centroid": {
            "lat": 46.3973294999999978927007759921252727508544921875,
            "lon": 142.73177079999999250503606162965297698974609375
        },
        "time_window": {
            "start_ts": "2026-06-04T04:14:50+00:00",
            "end_ts": "2026-06-04T08:08:53+00:00"
        },
        "searched_at": "2026-06-04T13:15:20.477364+00:00",
        "scene_id": "S1A_IW_GRDH_1SDV_20260604T082021_20260604T082050_064817_082AC3_F61D_COG",
        "scene_datetime": "2026-06-04T08:20:21.643366Z",
        "platform": "sentinel-1a",
        "bbox": {
            "min_lon": 141.163452000000006592017598450183868408203125,
            "min_lat": 45.2279970000000020036168280057609081268310546875,
            "max_lon": 144.846054000000009409632184542715549468994140625,
            "max_lat": 47.358294999999998253770172595977783203125
        },
        "assets": {
            "preview_url": "https:\/\/fleetleaks.com\/wp-content\/uploads\/fleetleaks-evidence\/sar-imagery\/2026\/06\/event_670872_thumbnail_20260604131523.png",
            "stored_path": "\/home\/fleetleaks\/public_html\/wp-content\/uploads\/fleetleaks-evidence\/sar-imagery\/2026\/06\/event_670872_thumbnail_20260604131523.png",
            "source": "copernicus_dataspace"
        },
        "notes": "Preview available for manual review"
    }
}

Methodology: 2026.01.18

Sts🛰️? Sakhalin South Approach

Jun 4, 2026 04:14 UTC 95/100 ▼

Vessel A: IMO 9004310 (ORIS) TOGO

Vessel B: IMO 9043794 (PERSEY) RUSSIA

Minimum Distance: 15 meters
Average Distance: 25 meters
Duration: 3h 54m
Period: 2026-06-04T04:14:50+00:00 to 2026-06-04T08:08:53+00:00
Vessel A Avg Speed: 0.2 knots
Vessel B Avg Speed: 0.2 knots
Zone: Sakhalin South Approach

Confidence Analysis

Score: 95/100

High-confidence STS candidate. Two tankers (ORIS and PERSEY) maintained close proximity (min 15m, avg 25m) for 234 minutes. Both vessels were slow-moving (avg speeds 0.2 and 0.2 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Sakhalin South Approach, a known STS activity area.

View scoring breakdown

Factor	Score	Detail
Distance Tightness	25/25	Min distance 15m, avg 25m
Duration	25/25	Duration 234 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: Sakhalin South Approach

🛰️ Satellite Corroboration

? SAR Inconclusive

Satellite imagery available but requires review

Preview available for manual review

Scene: S1A_IW_GRDH_1SDV_20260604T082021_20260604T082050_064817_082AC3_F61D_COG • Acquired: 2026-06-04T08:20:21.643366Z • Platform: sentinel-1a

Click image to view full size

Searched: 2026-06-04T13:30:01.790238+00:00

Show Raw Evidence JSON

{
    "vessel_a": {
        "mmsi": 671388100,
        "imo": 9004310,
        "name": "ORIS",
        "flag": "TOGO"
    },
    "vessel_b": {
        "mmsi": 273358480,
        "imo": 9043794,
        "name": "PERSEY",
        "flag": "RUSSIA"
    },
    "min_distance_m": 15.300000000000000710542735760100185871124267578125,
    "avg_distance_m": 24.60000000000000142108547152020037174224853515625,
    "distance_consistency_m": 11.5,
    "duration_minutes": 234.099999999999994315658113919198513031005859375,
    "overlap_duration_s": 14043,
    "speed_a_avg": 0.2300000000000000099920072216264088638126850128173828125,
    "speed_a_std": 0.11999999999999999555910790149937383830547332763671875,
    "speed_b_avg": 0.1700000000000000122124532708767219446599483489990234375,
    "speed_b_std": 0.059999999999999997779553950749686919152736663818359375,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.2300000000000000099920072216264088638126850128173828125,
            "max_sog": 0.299999999999999988897769753748434595763683319091796875
        },
        "vessel_b": {
            "avg_sog": 0.1700000000000000122124532708767219446599483489990234375,
            "max_sog": 0.200000000000000011102230246251565404236316680908203125
        }
    },
    "time_window": {
        "start": "2026-06-04T04:14:50+00:00",
        "end": "2026-06-04T08:08:53+00:00"
    },
    "points_count": {
        "vessel_a": 3,
        "vessel_b": 3
    },
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "score": {
        "value": 95,
        "components": {
            "distance_tightness": {
                "score": 25,
                "max": 25,
                "detail": "Min distance 15m, avg 25m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 234 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b112m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Sakhalin South Approach"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (ORIS and PERSEY) maintained close proximity (min 15m, avg 25m) for 234 minutes. Both vessels were slow-moving (avg speeds 0.2 and 0.2 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Sakhalin South Approach, a known STS activity area."
    },
    "sar": {
        "status": "inconclusive",
        "centroid": {
            "lat": 46.3973294999999978927007759921252727508544921875,
            "lon": 142.73177079999999250503606162965297698974609375
        },
        "time_window": {
            "start_ts": "2026-06-04T04:14:50+00:00",
            "end_ts": "2026-06-04T08:08:53+00:00"
        },
        "searched_at": "2026-06-04T13:30:01.790238+00:00",
        "scene_id": "S1A_IW_GRDH_1SDV_20260604T082021_20260604T082050_064817_082AC3_F61D_COG",
        "scene_datetime": "2026-06-04T08:20:21.643366Z",
        "platform": "sentinel-1a",
        "bbox": {
            "min_lon": 141.163452000000006592017598450183868408203125,
            "min_lat": 45.2279970000000020036168280057609081268310546875,
            "max_lon": 144.846054000000009409632184542715549468994140625,
            "max_lat": 47.358294999999998253770172595977783203125
        },
        "assets": {
            "preview_url": "https:\/\/fleetleaks.com\/wp-content\/uploads\/fleetleaks-evidence\/sar-imagery\/2026\/06\/event_670873_thumbnail_20260604133006.png",
            "stored_path": "\/home\/fleetleaks\/public_html\/wp-content\/uploads\/fleetleaks-evidence\/sar-imagery\/2026\/06\/event_670873_thumbnail_20260604133006.png",
            "source": "copernicus_dataspace"
        },
        "notes": "Preview available for manual review"
    }
}

Methodology: 2026.01.18

Zone Dwell Prigorodnoye/Sakhalin LNG

Jun 4, 2026 04:01 UTC 80.0% ▼

Zone: Prigorodnoye/Sakhalin LNG
Duration: 5h 7m
Data Points: 85 AIS positions
Period: 2026-06-04T04:01:43+00:00 to 2026-06-04T09:09:24+00:00

Show Raw Evidence JSON

{
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "dwell_minutes": 307.69999999999998863131622783839702606201171875,
    "points_in_zone": 85,
    "first_point": {
        "ts": "2026-06-04T04:01:43+00:00",
        "lat": 46.3972033000000010360963642597198486328125,
        "lon": 142.73268999999999095962266437709331512451171875
    },
    "last_point": {
        "ts": "2026-06-04T09:09:24+00:00",
        "lat": 46.2404183000000017500497051514685153961181640625,
        "lon": 142.847524999999990313881426118314266204833984375
    }
}

Methodology: 2026.01.18

Zone Dwell Sakhalin South Approach

Jun 4, 2026 04:01 UTC 80.0% ▼

Zone: Sakhalin South Approach
Duration: 5h 7m
Data Points: 85 AIS positions
Period: 2026-06-04T04:01:43+00:00 to 2026-06-04T09:09:24+00:00

Show Raw Evidence JSON

{
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "dwell_minutes": 307.69999999999998863131622783839702606201171875,
    "points_in_zone": 85,
    "first_point": {
        "ts": "2026-06-04T04:01:43+00:00",
        "lat": 46.3972033000000010360963642597198486328125,
        "lon": 142.73268999999999095962266437709331512451171875
    },
    "last_point": {
        "ts": "2026-06-04T09:09:24+00:00",
        "lat": 46.2404183000000017500497051514685153961181640625,
        "lon": 142.847524999999990313881426118314266204833984375
    }
}

Methodology: 2026.01.18

Loiter Prigorodnoye/Sakhalin LNG

Jun 4, 2026 04:01 UTC 75.0% ▼

Duration: 4h 7m
Radius: 1,010 meters
Data Points: 72 AIS positions
Centroid: 46.3973, 142.7319
Zone: Prigorodnoye/Sakhalin LNG

Show Raw Evidence JSON

{
    "radius_m": 1010.1000000000000227373675443232059478759765625,
    "duration_minutes": 247.5,
    "points": 72,
    "centroid": {
        "lat": 46.397329330555550086501170881092548370361328125,
        "lon": 142.731854243055551023644511587917804718017578125
    },
    "bbox": {
        "min_lat": 46.38975669999999951187419355846941471099853515625,
        "min_lon": 142.731081700000004275352694094181060791015625,
        "max_lat": 46.39809670000000352274582837708294391632080078125,
        "max_lon": 142.739113300000013850876712240278720855712890625
    },
    "zone_id": "russia_prigorodnoye"
}

Methodology: 2026.01.18

Loiter Sakhalin South Approach

Jun 4, 2026 04:01 UTC 75.0% ▼

Duration: 4h 7m
Radius: 1,010 meters
Data Points: 72 AIS positions
Centroid: 46.3973, 142.7319
Zone: Sakhalin South Approach

Show Raw Evidence JSON

{
    "radius_m": 1010.1000000000000227373675443232059478759765625,
    "duration_minutes": 247.5,
    "points": 72,
    "centroid": {
        "lat": 46.397329330555550086501170881092548370361328125,
        "lon": 142.731854243055551023644511587917804718017578125
    },
    "bbox": {
        "min_lat": 46.38975669999999951187419355846941471099853515625,
        "min_lon": 142.731081700000004275352694094181060791015625,
        "max_lat": 46.39809670000000352274582837708294391632080078125,
        "max_lon": 142.739113300000013850876712240278720855712890625
    },
    "zone_id": "russia_sakhalin_south"
}

Methodology: 2026.01.18

Sts🛰️? Prigorodnoye/Sakhalin LNG

Jun 4, 2026 03:05 UTC 95/100 ▼

Vessel A: IMO 9004310 (ORIS) TOGO

Vessel B: IMO 9043794 (PERSEY) RUSSIA

Minimum Distance: 13 meters
Average Distance: 19 meters
Duration: 5h 3m
Period: 2026-06-04T03:05:49+00:00 to 2026-06-04T08:08:53+00:00
Vessel A Avg Speed: 0.2 knots
Vessel B Avg Speed: 0.2 knots
Zone: Prigorodnoye/Sakhalin LNG

Confidence Analysis

Score: 95/100

High-confidence STS candidate. Two tankers (ORIS and PERSEY) maintained close proximity (min 13m, avg 19m) for 303 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 Prigorodnoye/Sakhalin LNG, a known STS activity area.

View scoring breakdown

Factor	Score	Detail
Distance Tightness	25/25	Min distance 13m, avg 19m
Duration	25/25	Duration 303 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: Prigorodnoye/Sakhalin LNG

🛰️ Satellite Corroboration

? SAR Inconclusive

Satellite imagery available but requires review

Preview available for manual review

Scene: S1A_IW_GRDH_1SDV_20260604T082021_20260604T082050_064817_082AC3_F61D_COG • Acquired: 2026-06-04T08:20:21.643366Z • Platform: sentinel-1a

Click image to view full size

Searched: 2026-06-04T12:45:06.810958+00:00

Show Raw Evidence JSON

{
    "vessel_a": {
        "mmsi": 671388100,
        "imo": 9004310,
        "name": "ORIS",
        "flag": "TOGO"
    },
    "vessel_b": {
        "mmsi": 273358480,
        "imo": 9043794,
        "name": "PERSEY",
        "flag": "RUSSIA"
    },
    "min_distance_m": 13.300000000000000710542735760100185871124267578125,
    "avg_distance_m": 19.39999999999999857891452847979962825775146484375,
    "distance_consistency_m": 6.5,
    "duration_minutes": 303.1000000000000227373675443232059478759765625,
    "overlap_duration_s": 18184,
    "speed_a_avg": 0.2200000000000000011102230246251565404236316680908203125,
    "speed_a_std": 0.1000000000000000055511151231257827021181583404541015625,
    "speed_b_avg": 0.1499999999999999944488848768742172978818416595458984375,
    "speed_b_std": 0.070000000000000006661338147750939242541790008544921875,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.2200000000000000011102230246251565404236316680908203125,
            "max_sog": 0.40000000000000002220446049250313080847263336181640625
        },
        "vessel_b": {
            "avg_sog": 0.1499999999999999944488848768742172978818416595458984375,
            "max_sog": 0.200000000000000011102230246251565404236316680908203125
        }
    },
    "time_window": {
        "start": "2026-06-04T03:05:49+00:00",
        "end": "2026-06-04T08:08:53+00:00"
    },
    "points_count": {
        "vessel_a": 12,
        "vessel_b": 12
    },
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "score": {
        "value": 95,
        "components": {
            "distance_tightness": {
                "score": 25,
                "max": 25,
                "detail": "Min distance 13m, avg 19m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 303 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: Prigorodnoye\/Sakhalin LNG"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (ORIS and PERSEY) maintained close proximity (min 13m, avg 19m) for 303 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 Prigorodnoye\/Sakhalin LNG, a known STS activity area."
    },
    "sar": {
        "status": "inconclusive",
        "centroid": {
            "lat": 46.39713739999999830843080417253077030181884765625,
            "lon": 142.733172499999994897734723053872585296630859375
        },
        "time_window": {
            "start_ts": "2026-06-04T03:05:49+00:00",
            "end_ts": "2026-06-04T08:08:53+00:00"
        },
        "searched_at": "2026-06-04T12:45:06.810958+00:00",
        "scene_id": "S1A_IW_GRDH_1SDV_20260604T082021_20260604T082050_064817_082AC3_F61D_COG",
        "scene_datetime": "2026-06-04T08:20:21.643366Z",
        "platform": "sentinel-1a",
        "bbox": {
            "min_lon": 141.163452000000006592017598450183868408203125,
            "min_lat": 45.2279970000000020036168280057609081268310546875,
            "max_lon": 144.846054000000009409632184542715549468994140625,
            "max_lat": 47.358294999999998253770172595977783203125
        },
        "assets": {
            "preview_url": "https:\/\/fleetleaks.com\/wp-content\/uploads\/fleetleaks-evidence\/sar-imagery\/2026\/06\/event_670422_thumbnail_20260604124510.png",
            "stored_path": "\/home\/fleetleaks\/public_html\/wp-content\/uploads\/fleetleaks-evidence\/sar-imagery\/2026\/06\/event_670422_thumbnail_20260604124510.png",
            "source": "copernicus_dataspace"
        },
        "notes": "Preview available for manual review"
    }
}

Methodology: 2026.01.18

Sts🛰️? Sakhalin South Approach

Jun 4, 2026 03:05 UTC 95/100 ▼

Vessel A: IMO 9004310 (ORIS) TOGO

Vessel B: IMO 9043794 (PERSEY) RUSSIA

Minimum Distance: 13 meters
Average Distance: 19 meters
Duration: 5h 3m
Period: 2026-06-04T03:05:49+00:00 to 2026-06-04T08:08:53+00:00
Vessel A Avg Speed: 0.2 knots
Vessel B Avg Speed: 0.2 knots
Zone: Sakhalin South Approach

Confidence Analysis

Score: 95/100

High-confidence STS candidate. Two tankers (ORIS and PERSEY) maintained close proximity (min 13m, avg 19m) for 303 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 Sakhalin South Approach, a known STS activity area.

View scoring breakdown

Factor	Score	Detail
Distance Tightness	25/25	Min distance 13m, avg 19m
Duration	25/25	Duration 303 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: Sakhalin South Approach

🛰️ Satellite Corroboration

? SAR Inconclusive

Satellite imagery available but requires review

Preview available for manual review

Scene: S1A_IW_GRDH_1SDV_20260604T082021_20260604T082050_064817_082AC3_F61D_COG • Acquired: 2026-06-04T08:20:21.643366Z • Platform: sentinel-1a

Click image to view full size

Searched: 2026-06-04T12:45:11.213812+00:00

Show Raw Evidence JSON

{
    "vessel_a": {
        "mmsi": 671388100,
        "imo": 9004310,
        "name": "ORIS",
        "flag": "TOGO"
    },
    "vessel_b": {
        "mmsi": 273358480,
        "imo": 9043794,
        "name": "PERSEY",
        "flag": "RUSSIA"
    },
    "min_distance_m": 13.300000000000000710542735760100185871124267578125,
    "avg_distance_m": 19.39999999999999857891452847979962825775146484375,
    "distance_consistency_m": 6.5,
    "duration_minutes": 303.1000000000000227373675443232059478759765625,
    "overlap_duration_s": 18184,
    "speed_a_avg": 0.2200000000000000011102230246251565404236316680908203125,
    "speed_a_std": 0.1000000000000000055511151231257827021181583404541015625,
    "speed_b_avg": 0.1499999999999999944488848768742172978818416595458984375,
    "speed_b_std": 0.070000000000000006661338147750939242541790008544921875,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.2200000000000000011102230246251565404236316680908203125,
            "max_sog": 0.40000000000000002220446049250313080847263336181640625
        },
        "vessel_b": {
            "avg_sog": 0.1499999999999999944488848768742172978818416595458984375,
            "max_sog": 0.200000000000000011102230246251565404236316680908203125
        }
    },
    "time_window": {
        "start": "2026-06-04T03:05:49+00:00",
        "end": "2026-06-04T08:08:53+00:00"
    },
    "points_count": {
        "vessel_a": 12,
        "vessel_b": 12
    },
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "score": {
        "value": 95,
        "components": {
            "distance_tightness": {
                "score": 25,
                "max": 25,
                "detail": "Min distance 13m, avg 19m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 303 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: Sakhalin South Approach"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (ORIS and PERSEY) maintained close proximity (min 13m, avg 19m) for 303 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 Sakhalin South Approach, a known STS activity area."
    },
    "sar": {
        "status": "inconclusive",
        "centroid": {
            "lat": 46.39713739999999830843080417253077030181884765625,
            "lon": 142.733172499999994897734723053872585296630859375
        },
        "time_window": {
            "start_ts": "2026-06-04T03:05:49+00:00",
            "end_ts": "2026-06-04T08:08:53+00:00"
        },
        "searched_at": "2026-06-04T12:45:11.213812+00:00",
        "scene_id": "S1A_IW_GRDH_1SDV_20260604T082021_20260604T082050_064817_082AC3_F61D_COG",
        "scene_datetime": "2026-06-04T08:20:21.643366Z",
        "platform": "sentinel-1a",
        "bbox": {
            "min_lon": 141.163452000000006592017598450183868408203125,
            "min_lat": 45.2279970000000020036168280057609081268310546875,
            "max_lon": 144.846054000000009409632184542715549468994140625,
            "max_lat": 47.358294999999998253770172595977783203125
        },
        "assets": {
            "preview_url": "https:\/\/fleetleaks.com\/wp-content\/uploads\/fleetleaks-evidence\/sar-imagery\/2026\/06\/event_670423_thumbnail_20260604124514.png",
            "stored_path": "\/home\/fleetleaks\/public_html\/wp-content\/uploads\/fleetleaks-evidence\/sar-imagery\/2026\/06\/event_670423_thumbnail_20260604124514.png",
            "source": "copernicus_dataspace"
        },
        "notes": "Preview available for manual review"
    }
}

Methodology: 2026.01.18

Zone Dwell Prigorodnoye/Sakhalin LNG

Jun 4, 2026 03:00 UTC 80.0% ▼

Zone: Prigorodnoye/Sakhalin LNG
Duration: 6h 8m
Data Points: 101 AIS positions
Period: 2026-06-04T03:00:43+00:00 to 2026-06-04T09:09:24+00:00

Show Raw Evidence JSON

{
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "dwell_minutes": 368.69999999999998863131622783839702606201171875,
    "points_in_zone": 101,
    "first_point": {
        "ts": "2026-06-04T03:00:43+00:00",
        "lat": 46.39678169999999823858161107636988162994384765625,
        "lon": 142.73471169999999119681888259947299957275390625
    },
    "last_point": {
        "ts": "2026-06-04T09:09:24+00:00",
        "lat": 46.2404183000000017500497051514685153961181640625,
        "lon": 142.847524999999990313881426118314266204833984375
    }
}

Methodology: 2026.01.18

Zone Dwell Sakhalin South Approach

Jun 4, 2026 03:00 UTC 80.0% ▼

Zone: Sakhalin South Approach
Duration: 6h 8m
Data Points: 101 AIS positions
Period: 2026-06-04T03:00:43+00:00 to 2026-06-04T09:09:24+00:00

Show Raw Evidence JSON

{
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "dwell_minutes": 368.69999999999998863131622783839702606201171875,
    "points_in_zone": 101,
    "first_point": {
        "ts": "2026-06-04T03:00:43+00:00",
        "lat": 46.39678169999999823858161107636988162994384765625,
        "lon": 142.73471169999999119681888259947299957275390625
    },
    "last_point": {
        "ts": "2026-06-04T09:09:24+00:00",
        "lat": 46.2404183000000017500497051514685153961181640625,
        "lon": 142.847524999999990313881426118314266204833984375
    }
}

Methodology: 2026.01.18

Loiter Prigorodnoye/Sakhalin LNG

Jun 4, 2026 03:00 UTC 75.0% ▼

Duration: 5h 8m
Radius: 988 meters
Data Points: 88 AIS positions
Centroid: 46.3973, 142.7322
Zone: Prigorodnoye/Sakhalin LNG

Show Raw Evidence JSON

{
    "radius_m": 987.799999999999954525264911353588104248046875,
    "duration_minutes": 308.5,
    "points": 88,
    "centroid": {
        "lat": 46.39725735000001805019564926624298095703125,
        "lon": 142.732225346590865910911816172301769256591796875
    },
    "bbox": {
        "min_lat": 46.38975669999999951187419355846941471099853515625,
        "min_lon": 142.731081700000004275352694094181060791015625,
        "max_lat": 46.39809670000000352274582837708294391632080078125,
        "max_lon": 142.739113300000013850876712240278720855712890625
    },
    "zone_id": "russia_prigorodnoye"
}

Methodology: 2026.01.18

Loiter Sakhalin South Approach

Jun 4, 2026 03:00 UTC 75.0% ▼

Duration: 5h 8m
Radius: 988 meters
Data Points: 88 AIS positions
Centroid: 46.3973, 142.7322
Zone: Sakhalin South Approach

Show Raw Evidence JSON

{
    "radius_m": 987.799999999999954525264911353588104248046875,
    "duration_minutes": 308.5,
    "points": 88,
    "centroid": {
        "lat": 46.39725735000001805019564926624298095703125,
        "lon": 142.732225346590865910911816172301769256591796875
    },
    "bbox": {
        "min_lat": 46.38975669999999951187419355846941471099853515625,
        "min_lon": 142.731081700000004275352694094181060791015625,
        "max_lat": 46.39809670000000352274582837708294391632080078125,
        "max_lon": 142.739113300000013850876712240278720855712890625
    },
    "zone_id": "russia_sakhalin_south"
}

Methodology: 2026.01.18

Sts🛰️✗ Prigorodnoye/Sakhalin LNG

Jun 4, 2026 02:26 UTC 89/100 ▼

Vessel A: IMO 9043794 (PERSEY) RUSSIA

Vessel B: IMO 9004310 (ORIS) TOGO

Minimum Distance: 6 meters
Average Distance: 29 meters
Duration: 2h 8m
Period: 2026-06-04T02:21:22+00:00 to 2026-06-04T04:29:44+00:00
Vessel A Avg Speed: 0.3 knots
Vessel B Avg Speed: 0.3 knots
Zone: Prigorodnoye/Sakhalin LNG

Confidence Analysis

Score: 89/100

High-confidence STS candidate. Two tankers (PERSEY and ORIS) maintained close proximity (min 6m, avg 29m) for 128 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 Prigorodnoye/Sakhalin LNG, a known STS activity area.

View scoring breakdown

Factor	Score	Detail
Distance Tightness	25/25	Min distance 6m, avg 29m
Duration	25/25	Duration 128 minutes
Speed Stability	17/20	both nearly stationary; stable speeds
Distance Consistency	12/15	Distance variance ±31m
Isolation	5/10	Isolation data not available
Context	5/5	In monitored zone: Prigorodnoye/Sakhalin LNG

🛰️ Satellite Corroboration

✗ SAR Not Available

No satellite imagery for this time/location

No Sentinel-1 scenes covering AOI and time window

Searched: 2026-06-04T10:15:05.105941+00:00

Show Raw Evidence JSON

{
    "vessel_a": {
        "mmsi": 273358480,
        "imo": 9043794,
        "name": "PERSEY",
        "flag": "RUSSIA"
    },
    "vessel_b": {
        "mmsi": 671388100,
        "imo": 9004310,
        "name": "ORIS",
        "flag": "TOGO"
    },
    "min_distance_m": 5.9000000000000003552713678800500929355621337890625,
    "avg_distance_m": 28.699999999999999289457264239899814128875732421875,
    "distance_consistency_m": 31.199999999999999289457264239899814128875732421875,
    "duration_minutes": 128.400000000000005684341886080801486968994140625,
    "overlap_duration_s": 7702,
    "speed_a_avg": 0.2800000000000000266453525910037569701671600341796875,
    "speed_a_std": 0.320000000000000006661338147750939242541790008544921875,
    "speed_b_avg": 0.270000000000000017763568394002504646778106689453125,
    "speed_b_std": 0.11999999999999999555910790149937383830547332763671875,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.2800000000000000266453525910037569701671600341796875,
            "max_sog": 1.899999999999999911182158029987476766109466552734375
        },
        "vessel_b": {
            "avg_sog": 0.270000000000000017763568394002504646778106689453125,
            "max_sog": 0.5
        }
    },
    "time_window": {
        "start": "2026-06-04T02:21:22+00:00",
        "end": "2026-06-04T04:29:44+00:00"
    },
    "points_count": {
        "vessel_a": 39,
        "vessel_b": 39
    },
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "score": {
        "value": 89,
        "components": {
            "distance_tightness": {
                "score": 25,
                "max": 25,
                "detail": "Min distance 6m, avg 29m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 128 minutes"
            },
            "speed_stability": {
                "score": 17,
                "max": 20,
                "detail": "both nearly stationary; stable speeds"
            },
            "distance_consistency": {
                "score": 12,
                "max": 15,
                "detail": "Distance variance \u00b131m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Prigorodnoye\/Sakhalin LNG"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (PERSEY and ORIS) maintained close proximity (min 6m, avg 29m) for 128 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 Prigorodnoye\/Sakhalin LNG, a known STS activity area."
    },
    "sar": {
        "status": "not_found",
        "centroid": {
            "lat": 46.39712659999999999627107172273099422454833984375,
            "lon": 142.73405919999999014180502854287624359130859375
        },
        "time_window": {
            "start_ts": "2026-06-04T02:26:49+00:00",
            "end_ts": "2026-06-04T04:29:44+00:00"
        },
        "searched_at": "2026-06-04T10:15:05.105941+00:00",
        "notes": "No Sentinel-1 scenes covering AOI and time window"
    }
}

Methodology: 2026.01.18

Sts🛰️✗ Sakhalin South Approach

Jun 4, 2026 02:26 UTC 89/100 ▼

Vessel A: IMO 9043794 (PERSEY) RUSSIA

Vessel B: IMO 9004310 (ORIS) TOGO

Minimum Distance: 6 meters
Average Distance: 29 meters
Duration: 2h 8m
Period: 2026-06-04T02:21:22+00:00 to 2026-06-04T04:29:44+00:00
Vessel A Avg Speed: 0.3 knots
Vessel B Avg Speed: 0.3 knots
Zone: Sakhalin South Approach

Confidence Analysis

Score: 89/100

High-confidence STS candidate. Two tankers (PERSEY and ORIS) maintained close proximity (min 6m, avg 29m) for 128 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 Sakhalin South Approach, a known STS activity area.

View scoring breakdown

Factor	Score	Detail
Distance Tightness	25/25	Min distance 6m, avg 29m
Duration	25/25	Duration 128 minutes
Speed Stability	17/20	both nearly stationary; stable speeds
Distance Consistency	12/15	Distance variance ±31m
Isolation	5/10	Isolation data not available
Context	5/5	In monitored zone: Sakhalin South Approach

🛰️ Satellite Corroboration

✗ SAR Not Available

No satellite imagery for this time/location

No Sentinel-1 scenes covering AOI and time window

Searched: 2026-06-04T10:15:07.838380+00:00

Show Raw Evidence JSON

{
    "vessel_a": {
        "mmsi": 273358480,
        "imo": 9043794,
        "name": "PERSEY",
        "flag": "RUSSIA"
    },
    "vessel_b": {
        "mmsi": 671388100,
        "imo": 9004310,
        "name": "ORIS",
        "flag": "TOGO"
    },
    "min_distance_m": 5.9000000000000003552713678800500929355621337890625,
    "avg_distance_m": 28.699999999999999289457264239899814128875732421875,
    "distance_consistency_m": 31.199999999999999289457264239899814128875732421875,
    "duration_minutes": 128.400000000000005684341886080801486968994140625,
    "overlap_duration_s": 7702,
    "speed_a_avg": 0.2800000000000000266453525910037569701671600341796875,
    "speed_a_std": 0.320000000000000006661338147750939242541790008544921875,
    "speed_b_avg": 0.270000000000000017763568394002504646778106689453125,
    "speed_b_std": 0.11999999999999999555910790149937383830547332763671875,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.2800000000000000266453525910037569701671600341796875,
            "max_sog": 1.899999999999999911182158029987476766109466552734375
        },
        "vessel_b": {
            "avg_sog": 0.270000000000000017763568394002504646778106689453125,
            "max_sog": 0.5
        }
    },
    "time_window": {
        "start": "2026-06-04T02:21:22+00:00",
        "end": "2026-06-04T04:29:44+00:00"
    },
    "points_count": {
        "vessel_a": 39,
        "vessel_b": 39
    },
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "score": {
        "value": 89,
        "components": {
            "distance_tightness": {
                "score": 25,
                "max": 25,
                "detail": "Min distance 6m, avg 29m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 128 minutes"
            },
            "speed_stability": {
                "score": 17,
                "max": 20,
                "detail": "both nearly stationary; stable speeds"
            },
            "distance_consistency": {
                "score": 12,
                "max": 15,
                "detail": "Distance variance \u00b131m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Sakhalin South Approach"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (PERSEY and ORIS) maintained close proximity (min 6m, avg 29m) for 128 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 Sakhalin South Approach, a known STS activity area."
    },
    "sar": {
        "status": "not_found",
        "centroid": {
            "lat": 46.39712659999999999627107172273099422454833984375,
            "lon": 142.73405919999999014180502854287624359130859375
        },
        "time_window": {
            "start_ts": "2026-06-04T02:26:49+00:00",
            "end_ts": "2026-06-04T04:29:44+00:00"
        },
        "searched_at": "2026-06-04T10:15:07.838380+00:00",
        "notes": "No Sentinel-1 scenes covering AOI and time window"
    }
}

Methodology: 2026.01.18

Loiter Prigorodnoye/Sakhalin LNG

Jun 4, 2026 02:14 UTC 75.0% ▼

Duration: 5h 54m
Radius: 1,138 meters
Data Points: 104 AIS positions
Centroid: 46.3971, 142.7323
Zone: Prigorodnoye/Sakhalin LNG

Show Raw Evidence JSON

{
    "radius_m": 1138.299999999999954525264911353588104248046875,
    "duration_minutes": 354.80000000000001136868377216160297393798828125,
    "points": 104,
    "centroid": {
        "lat": 46.39714024230772082546536694280803203582763671875,
        "lon": 142.7322656625000263375113718211650848388671875
    },
    "bbox": {
        "min_lat": 46.389281699999997954364516772329807281494140625,
        "min_lon": 142.72277669999999716310412622988224029541015625,
        "max_lat": 46.39809670000000352274582837708294391632080078125,
        "max_lon": 142.739113300000013850876712240278720855712890625
    },
    "zone_id": "russia_prigorodnoye"
}

Methodology: 2026.01.18

Loiter Sakhalin South Approach

Jun 4, 2026 02:14 UTC 75.0% ▼

Duration: 5h 54m
Radius: 1,138 meters
Data Points: 104 AIS positions
Centroid: 46.3971, 142.7323
Zone: Sakhalin South Approach

Show Raw Evidence JSON

{
    "radius_m": 1138.299999999999954525264911353588104248046875,
    "duration_minutes": 354.80000000000001136868377216160297393798828125,
    "points": 104,
    "centroid": {
        "lat": 46.39714024230772082546536694280803203582763671875,
        "lon": 142.7322656625000263375113718211650848388671875
    },
    "bbox": {
        "min_lat": 46.389281699999997954364516772329807281494140625,
        "min_lon": 142.72277669999999716310412622988224029541015625,
        "max_lat": 46.39809670000000352274582837708294391632080078125,
        "max_lon": 142.739113300000013850876712240278720855712890625
    },
    "zone_id": "russia_sakhalin_south"
}

Methodology: 2026.01.18

Zone Dwell Sakhalin South Approach

Jun 4, 2026 02:00 UTC 80.0% ▼

Zone: Sakhalin South Approach
Duration: 6h 36m
Data Points: 111 AIS positions
Period: 2026-06-04T02:32:33+00:00 to 2026-06-04T09:09:24+00:00

Show Raw Evidence JSON

{
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "dwell_minutes": 396.8999999999999772626324556767940521240234375,
    "points_in_zone": 111,
    "first_point": {
        "ts": "2026-06-04T02:32:33+00:00",
        "lat": 46.3974367000000000871295924298465251922607421875,
        "lon": 142.7330733000000009269570000469684600830078125
    },
    "last_point": {
        "ts": "2026-06-04T09:09:24+00:00",
        "lat": 46.2404183000000017500497051514685153961181640625,
        "lon": 142.847524999999990313881426118314266204833984375
    }
}

Methodology: 2026.01.18

Zone Dwell Prigorodnoye/Sakhalin LNG

Jun 4, 2026 02:00 UTC 80.0% ▼

Zone: Prigorodnoye/Sakhalin LNG
Duration: 6h 36m
Data Points: 111 AIS positions
Period: 2026-06-04T02:32:33+00:00 to 2026-06-04T09:09:24+00:00

Show Raw Evidence JSON

{
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "dwell_minutes": 396.8999999999999772626324556767940521240234375,
    "points_in_zone": 111,
    "first_point": {
        "ts": "2026-06-04T02:32:33+00:00",
        "lat": 46.3974367000000000871295924298465251922607421875,
        "lon": 142.7330733000000009269570000469684600830078125
    },
    "last_point": {
        "ts": "2026-06-04T09:09:24+00:00",
        "lat": 46.2404183000000017500497051514685153961181640625,
        "lon": 142.847524999999990313881426118314266204833984375
    }
}

Methodology: 2026.01.18

Zone Dwell Prigorodnoye/Sakhalin LNG

Jun 4, 2026 01:06 UTC 80.0% ▼

Zone: Prigorodnoye/Sakhalin LNG
Duration: 6h 38m
Data Points: 129 AIS positions
Period: 2026-06-04T01:50:18+00:00 to 2026-06-04T08:28:43+00:00

Show Raw Evidence JSON

{
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "dwell_minutes": 398.3999999999999772626324556767940521240234375,
    "points_in_zone": 129,
    "first_point": {
        "ts": "2026-06-04T01:50:18+00:00",
        "lat": 46.32447330000000107474988908506929874420166015625,
        "lon": 142.69323669999999992796801961958408355712890625
    },
    "last_point": {
        "ts": "2026-06-04T08:28:43+00:00",
        "lat": 46.3425833000000011452357284724712371826171875,
        "lon": 142.764919999999989386196830309927463531494140625
    }
}

Methodology: 2026.01.18

Zone Dwell Sakhalin South Approach

Jun 4, 2026 01:06 UTC 80.0% ▼

Zone: Sakhalin South Approach
Duration: 6h 38m
Data Points: 129 AIS positions
Period: 2026-06-04T01:50:18+00:00 to 2026-06-04T08:28:43+00:00

Show Raw Evidence JSON

{
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "dwell_minutes": 398.3999999999999772626324556767940521240234375,
    "points_in_zone": 129,
    "first_point": {
        "ts": "2026-06-04T01:50:18+00:00",
        "lat": 46.32447330000000107474988908506929874420166015625,
        "lon": 142.69323669999999992796801961958408355712890625
    },
    "last_point": {
        "ts": "2026-06-04T08:28:43+00:00",
        "lat": 46.3425833000000011452357284724712371826171875,
        "lon": 142.764919999999989386196830309927463531494140625
    }
}

Methodology: 2026.01.18

Zone Dwell Sakhalin South Approach

May 21, 2026 12:31 UTC 80.0% ▼

Zone: Sakhalin South Approach
Duration: 1h 43m
Data Points: 18 AIS positions
Period: 2026-05-21T12:31:47+00:00 to 2026-05-21T14:15:08+00:00

Show Raw Evidence JSON

{
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "dwell_minutes": 103.2999999999999971578290569595992565155029296875,
    "points_in_zone": 18,
    "first_point": {
        "ts": "2026-05-21T12:31:47+00:00",
        "lat": 46.4014082999999999401552486233413219451904296875,
        "lon": 142.670400000000000773070496506989002227783203125
    },
    "last_point": {
        "ts": "2026-05-21T14:15:08+00:00",
        "lat": 46.33494499999999760575519758276641368865966796875,
        "lon": 142.702501699999999118517735041677951812744140625
    }
}

Methodology: 2026.01.18

Zone Dwell Prigorodnoye/Sakhalin LNG

May 21, 2026 12:31 UTC 80.0% ▼

Zone: Prigorodnoye/Sakhalin LNG
Duration: 1h 43m
Data Points: 18 AIS positions
Period: 2026-05-21T12:31:47+00:00 to 2026-05-21T14:15:08+00:00

Show Raw Evidence JSON

{
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "dwell_minutes": 103.2999999999999971578290569595992565155029296875,
    "points_in_zone": 18,
    "first_point": {
        "ts": "2026-05-21T12:31:47+00:00",
        "lat": 46.4014082999999999401552486233413219451904296875,
        "lon": 142.670400000000000773070496506989002227783203125
    },
    "last_point": {
        "ts": "2026-05-21T14:15:08+00:00",
        "lat": 46.33494499999999760575519758276641368865966796875,
        "lon": 142.702501699999999118517735041677951812744140625
    }
}

Methodology: 2026.01.18

Zone Dwell Sakhalin South Approach

May 21, 2026 09:42 UTC 80.0% ▼

Zone: Sakhalin South Approach
Duration: 4h 32m
Data Points: 21 AIS positions
Period: 2026-05-21T09:42:28+00:00 to 2026-05-21T14:15:08+00:00

Show Raw Evidence JSON

{
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "dwell_minutes": 272.69999999999998863131622783839702606201171875,
    "points_in_zone": 21,
    "first_point": {
        "ts": "2026-05-21T09:42:28+00:00",
        "lat": 46.40170330000000120662662084214389324188232421875,
        "lon": 142.67122829999999567007762379944324493408203125
    },
    "last_point": {
        "ts": "2026-05-21T14:15:08+00:00",
        "lat": 46.33494499999999760575519758276641368865966796875,
        "lon": 142.702501699999999118517735041677951812744140625
    }
}

Methodology: 2026.01.18

Zone Dwell Prigorodnoye/Sakhalin LNG

May 21, 2026 09:42 UTC 80.0% ▼

Zone: Prigorodnoye/Sakhalin LNG
Duration: 4h 32m
Data Points: 21 AIS positions
Period: 2026-05-21T09:42:28+00:00 to 2026-05-21T14:15:08+00:00

Show Raw Evidence JSON

{
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "dwell_minutes": 272.69999999999998863131622783839702606201171875,
    "points_in_zone": 21,
    "first_point": {
        "ts": "2026-05-21T09:42:28+00:00",
        "lat": 46.40170330000000120662662084214389324188232421875,
        "lon": 142.67122829999999567007762379944324493408203125
    },
    "last_point": {
        "ts": "2026-05-21T14:15:08+00:00",
        "lat": 46.33494499999999760575519758276641368865966796875,
        "lon": 142.702501699999999118517735041677951812744140625
    }
}

Methodology: 2026.01.18

Zone Dwell Prigorodnoye/Sakhalin LNG

May 21, 2026 08:02 UTC 80.0% ▼

Zone: Prigorodnoye/Sakhalin LNG
Duration: 6h 12m
Data Points: 32 AIS positions
Period: 2026-05-21T08:02:18+00:00 to 2026-05-21T14:15:08+00:00

Show Raw Evidence JSON

{
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "dwell_minutes": 372.80000000000001136868377216160297393798828125,
    "points_in_zone": 32,
    "first_point": {
        "ts": "2026-05-21T08:02:18+00:00",
        "lat": 46.4046067000000022062522475607693195343017578125,
        "lon": 142.650908299999997552731656469404697418212890625
    },
    "last_point": {
        "ts": "2026-05-21T14:15:08+00:00",
        "lat": 46.33494499999999760575519758276641368865966796875,
        "lon": 142.702501699999999118517735041677951812744140625
    }
}

Methodology: 2026.01.18

Zone Dwell Sakhalin South Approach

May 21, 2026 08:02 UTC 80.0% ▼

Zone: Sakhalin South Approach
Duration: 6h 12m
Data Points: 32 AIS positions
Period: 2026-05-21T08:02:18+00:00 to 2026-05-21T14:15:08+00:00

Show Raw Evidence JSON

{
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "dwell_minutes": 372.80000000000001136868377216160297393798828125,
    "points_in_zone": 32,
    "first_point": {
        "ts": "2026-05-21T08:02:18+00:00",
        "lat": 46.4046067000000022062522475607693195343017578125,
        "lon": 142.650908299999997552731656469404697418212890625
    },
    "last_point": {
        "ts": "2026-05-21T14:15:08+00:00",
        "lat": 46.33494499999999760575519758276641368865966796875,
        "lon": 142.702501699999999118517735041677951812744140625
    }
}

Methodology: 2026.01.18

Zone Dwell Sakhalin South Approach

May 21, 2026 07:04 UTC 80.0% ▼

Zone: Sakhalin South Approach
Duration: 6h 30m
Data Points: 38 AIS positions
Period: 2026-05-21T07:44:18+00:00 to 2026-05-21T14:15:08+00:00

Show Raw Evidence JSON

{
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "dwell_minutes": 390.80000000000001136868377216160297393798828125,
    "points_in_zone": 38,
    "first_point": {
        "ts": "2026-05-21T07:44:18+00:00",
        "lat": 46.40458000000000282625478575937449932098388671875,
        "lon": 142.650946699999991551521816290915012359619140625
    },
    "last_point": {
        "ts": "2026-05-21T14:15:08+00:00",
        "lat": 46.33494499999999760575519758276641368865966796875,
        "lon": 142.702501699999999118517735041677951812744140625
    }
}

Methodology: 2026.01.18

Zone Dwell Prigorodnoye/Sakhalin LNG

May 21, 2026 07:04 UTC 80.0% ▼

Zone: Prigorodnoye/Sakhalin LNG
Duration: 6h 30m
Data Points: 38 AIS positions
Period: 2026-05-21T07:44:18+00:00 to 2026-05-21T14:15:08+00:00

Show Raw Evidence JSON

{
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "dwell_minutes": 390.80000000000001136868377216160297393798828125,
    "points_in_zone": 38,
    "first_point": {
        "ts": "2026-05-21T07:44:18+00:00",
        "lat": 46.40458000000000282625478575937449932098388671875,
        "lon": 142.650946699999991551521816290915012359619140625
    },
    "last_point": {
        "ts": "2026-05-21T14:15:08+00:00",
        "lat": 46.33494499999999760575519758276641368865966796875,
        "lon": 142.702501699999999118517735041677951812744140625
    }
}

Methodology: 2026.01.18

Zone Dwell Sakhalin South Approach

May 21, 2026 06:03 UTC 80.0% ▼

Zone: Sakhalin South Approach
Duration: 6h 32m
Data Points: 32 AIS positions
Period: 2026-05-21T06:52:28+00:00 to 2026-05-21T13:25:07+00:00

Show Raw Evidence JSON

{
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "dwell_minutes": 392.6000000000000227373675443232059478759765625,
    "points_in_zone": 32,
    "first_point": {
        "ts": "2026-05-21T06:52:28+00:00",
        "lat": 46.40462500000000289901436190120875835418701171875,
        "lon": 142.651109999999988531271810643374919891357421875
    },
    "last_point": {
        "ts": "2026-05-21T13:25:07+00:00",
        "lat": 46.401448299999998425846570171415805816650390625,
        "lon": 142.67031170000001338848960585892200469970703125
    }
}

Methodology: 2026.01.18

Zone Dwell Prigorodnoye/Sakhalin LNG

May 21, 2026 06:03 UTC 80.0% ▼

Zone: Prigorodnoye/Sakhalin LNG
Duration: 6h 32m
Data Points: 32 AIS positions
Period: 2026-05-21T06:52:28+00:00 to 2026-05-21T13:25:07+00:00

Show Raw Evidence JSON

{
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "dwell_minutes": 392.6000000000000227373675443232059478759765625,
    "points_in_zone": 32,
    "first_point": {
        "ts": "2026-05-21T06:52:28+00:00",
        "lat": 46.40462500000000289901436190120875835418701171875,
        "lon": 142.651109999999988531271810643374919891357421875
    },
    "last_point": {
        "ts": "2026-05-21T13:25:07+00:00",
        "lat": 46.401448299999998425846570171415805816650390625,
        "lon": 142.67031170000001338848960585892200469970703125
    }
}

Methodology: 2026.01.18

Loiter Prigorodnoye/Sakhalin LNG

May 21, 2026 06:03 UTC 75.0% ▼

Duration: 2h 29m
Radius: 296 meters
Data Points: 34 AIS positions
Centroid: 46.4045, 142.6510
Zone: Prigorodnoye/Sakhalin LNG

Show Raw Evidence JSON

{
    "radius_m": 295.8999999999999772626324556767940521240234375,
    "duration_minutes": 149.69999999999998863131622783839702606201171875,
    "points": 34,
    "centroid": {
        "lat": 46.4044967647058825832573347724974155426025390625,
        "lon": 142.65095701470590938697569072246551513671875
    },
    "bbox": {
        "min_lat": 46.402001699999999573265085928142070770263671875,
        "min_lon": 142.649616699999995717007550410926342010498046875,
        "max_lat": 46.4047283000000021502273739315569400787353515625,
        "max_lon": 142.651698299999992514131008647382259368896484375
    },
    "zone_id": "russia_prigorodnoye"
}

Methodology: 2026.01.18

Loiter Sakhalin South Approach

May 21, 2026 06:03 UTC 75.0% ▼

Duration: 2h 29m
Radius: 296 meters
Data Points: 34 AIS positions
Centroid: 46.4045, 142.6510
Zone: Sakhalin South Approach

Show Raw Evidence JSON

{
    "radius_m": 295.8999999999999772626324556767940521240234375,
    "duration_minutes": 149.69999999999998863131622783839702606201171875,
    "points": 34,
    "centroid": {
        "lat": 46.4044967647058825832573347724974155426025390625,
        "lon": 142.65095701470590938697569072246551513671875
    },
    "bbox": {
        "min_lat": 46.402001699999999573265085928142070770263671875,
        "min_lon": 142.649616699999995717007550410926342010498046875,
        "max_lat": 46.4047283000000021502273739315569400787353515625,
        "max_lon": 142.651698299999992514131008647382259368896484375
    },
    "zone_id": "russia_sakhalin_south"
}

Methodology: 2026.01.18

Zone Dwell Sakhalin South Approach

May 21, 2026 05:00 UTC 80.0% ▼

Zone: Sakhalin South Approach
Duration: 4h 52m
Data Points: 51 AIS positions
Period: 2026-05-21T05:00:17+00:00 to 2026-05-21T09:52:48+00:00

Show Raw Evidence JSON

{
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "dwell_minutes": 292.5,
    "points_in_zone": 51,
    "first_point": {
        "ts": "2026-05-21T05:00:17+00:00",
        "lat": 46.404553300000003446257323957979679107666015625,
        "lon": 142.65109830000000101790647022426128387451171875
    },
    "last_point": {
        "ts": "2026-05-21T09:52:48+00:00",
        "lat": 46.4016883000000035508492146618664264678955078125,
        "lon": 142.671283299999998916973709128797054290771484375
    }
}

Methodology: 2026.01.18

Zone Dwell Prigorodnoye/Sakhalin LNG

May 21, 2026 05:00 UTC 80.0% ▼

Zone: Prigorodnoye/Sakhalin LNG
Duration: 4h 52m
Data Points: 51 AIS positions
Period: 2026-05-21T05:00:17+00:00 to 2026-05-21T09:52:48+00:00

Show Raw Evidence JSON

{
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "dwell_minutes": 292.5,
    "points_in_zone": 51,
    "first_point": {
        "ts": "2026-05-21T05:00:17+00:00",
        "lat": 46.404553300000003446257323957979679107666015625,
        "lon": 142.65109830000000101790647022426128387451171875
    },
    "last_point": {
        "ts": "2026-05-21T09:52:48+00:00",
        "lat": 46.4016883000000035508492146618664264678955078125,
        "lon": 142.671283299999998916973709128797054290771484375
    }
}

Methodology: 2026.01.18

Loiter Prigorodnoye/Sakhalin LNG

May 21, 2026 05:00 UTC 75.0% ▼

Duration: 3h 32m
Radius: 298 meters
Data Points: 48 AIS positions
Centroid: 46.4045, 142.6511
Zone: Prigorodnoye/Sakhalin LNG

Show Raw Evidence JSON

{
    "radius_m": 298,
    "duration_minutes": 212.5,
    "points": 48,
    "centroid": {
        "lat": 46.40448461666665735947390203364193439483642578125,
        "lon": 142.651078300000023091342882253229618072509765625
    },
    "bbox": {
        "min_lat": 46.402001699999999573265085928142070770263671875,
        "min_lon": 142.649616699999995717007550410926342010498046875,
        "max_lat": 46.4047283000000021502273739315569400787353515625,
        "max_lon": 142.651698299999992514131008647382259368896484375
    },
    "zone_id": "russia_prigorodnoye"
}

Methodology: 2026.01.18

Loiter Sakhalin South Approach

May 21, 2026 05:00 UTC 75.0% ▼

Duration: 3h 32m
Radius: 298 meters
Data Points: 48 AIS positions
Centroid: 46.4045, 142.6511
Zone: Sakhalin South Approach

Show Raw Evidence JSON

{
    "radius_m": 298,
    "duration_minutes": 212.5,
    "points": 48,
    "centroid": {
        "lat": 46.40448461666665735947390203364193439483642578125,
        "lon": 142.651078300000023091342882253229618072509765625
    },
    "bbox": {
        "min_lat": 46.402001699999999573265085928142070770263671875,
        "min_lon": 142.649616699999995717007550410926342010498046875,
        "max_lat": 46.4047283000000021502273739315569400787353515625,
        "max_lon": 142.651698299999992514131008647382259368896484375
    },
    "zone_id": "russia_sakhalin_south"
}

Methodology: 2026.01.18

Loiter Prigorodnoye/Sakhalin LNG

May 21, 2026 04:00 UTC 75.0% ▼

Duration: 4h 32m
Radius: 372 meters
Data Points: 66 AIS positions
Centroid: 46.4044, 142.6512
Zone: Prigorodnoye/Sakhalin LNG

Show Raw Evidence JSON

{
    "radius_m": 372.30000000000001136868377216160297393798828125,
    "duration_minutes": 272.69999999999998863131622783839702606201171875,
    "points": 66,
    "centroid": {
        "lat": 46.404390656060598985277465544641017913818359375,
        "lon": 142.651152301515111275875824503600597381591796875
    },
    "bbox": {
        "min_lat": 46.402001699999999573265085928142070770263671875,
        "min_lon": 142.649616699999995717007550410926342010498046875,
        "max_lat": 46.40473329999999663186827092431485652923583984375,
        "max_lon": 142.6557966999999962354195304214954376220703125
    },
    "zone_id": "russia_prigorodnoye"
}

Methodology: 2026.01.18

Loiter Sakhalin South Approach

May 21, 2026 04:00 UTC 75.0% ▼

Duration: 4h 32m
Radius: 372 meters
Data Points: 66 AIS positions
Centroid: 46.4044, 142.6512
Zone: Sakhalin South Approach

Show Raw Evidence JSON

{
    "radius_m": 372.30000000000001136868377216160297393798828125,
    "duration_minutes": 272.69999999999998863131622783839702606201171875,
    "points": 66,
    "centroid": {
        "lat": 46.404390656060598985277465544641017913818359375,
        "lon": 142.651152301515111275875824503600597381591796875
    },
    "bbox": {
        "min_lat": 46.402001699999999573265085928142070770263671875,
        "min_lon": 142.649616699999995717007550410926342010498046875,
        "max_lat": 46.40473329999999663186827092431485652923583984375,
        "max_lon": 142.6557966999999962354195304214954376220703125
    },
    "zone_id": "russia_sakhalin_south"
}

Methodology: 2026.01.18

Zone Dwell Sakhalin South Approach

May 21, 2026 04:00 UTC 80.0% ▼

Zone: Sakhalin South Approach
Duration: 5h 52m
Data Points: 69 AIS positions
Period: 2026-05-21T04:00:08+00:00 to 2026-05-21T09:52:48+00:00

Show Raw Evidence JSON

{
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "dwell_minutes": 352.69999999999998863131622783839702606201171875,
    "points_in_zone": 69,
    "first_point": {
        "ts": "2026-05-21T04:00:08+00:00",
        "lat": 46.40344499999999783312887302599847316741943359375,
        "lon": 142.6557966999999962354195304214954376220703125
    },
    "last_point": {
        "ts": "2026-05-21T09:52:48+00:00",
        "lat": 46.4016883000000035508492146618664264678955078125,
        "lon": 142.671283299999998916973709128797054290771484375
    }
}

Methodology: 2026.01.18

Zone Dwell Prigorodnoye/Sakhalin LNG

May 21, 2026 04:00 UTC 80.0% ▼

Zone: Prigorodnoye/Sakhalin LNG
Duration: 5h 52m
Data Points: 69 AIS positions
Period: 2026-05-21T04:00:08+00:00 to 2026-05-21T09:52:48+00:00

Show Raw Evidence JSON

{
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "dwell_minutes": 352.69999999999998863131622783839702606201171875,
    "points_in_zone": 69,
    "first_point": {
        "ts": "2026-05-21T04:00:08+00:00",
        "lat": 46.40344499999999783312887302599847316741943359375,
        "lon": 142.6557966999999962354195304214954376220703125
    },
    "last_point": {
        "ts": "2026-05-21T09:52:48+00:00",
        "lat": 46.4016883000000035508492146618664264678955078125,
        "lon": 142.671283299999998916973709128797054290771484375
    }
}

Methodology: 2026.01.18

Loiter Prigorodnoye/Sakhalin LNG

May 21, 2026 03:38 UTC 75.0% ▼

Duration: 4h 53m
Radius: 2,538 meters
Data Points: 75 AIS positions
Centroid: 46.4036, 142.6530
Zone: Prigorodnoye/Sakhalin LNG

Show Raw Evidence JSON

{
    "radius_m": 2538.3000000000001818989403545856475830078125,
    "duration_minutes": 293.8999999999999772626324556767940521240234375,
    "points": 75,
    "centroid": {
        "lat": 46.40355679999999694018697482533752918243408203125,
        "lon": 142.653024490666638257607701234519481658935546875
    },
    "bbox": {
        "min_lat": 46.38940670000000210393409361131489276885986328125,
        "min_lon": 142.649616699999995717007550410926342010498046875,
        "max_lat": 46.40473329999999663186827092431485652923583984375,
        "max_lon": 142.67892829999999548817868344485759735107421875
    },
    "zone_id": "russia_prigorodnoye"
}

Methodology: 2026.01.18

Loiter Sakhalin South Approach

May 21, 2026 03:38 UTC 75.0% ▼

Duration: 4h 53m
Radius: 2,538 meters
Data Points: 75 AIS positions
Centroid: 46.4036, 142.6530
Zone: Sakhalin South Approach

Show Raw Evidence JSON

{
    "radius_m": 2538.3000000000001818989403545856475830078125,
    "duration_minutes": 293.8999999999999772626324556767940521240234375,
    "points": 75,
    "centroid": {
        "lat": 46.40355679999999694018697482533752918243408203125,
        "lon": 142.653024490666638257607701234519481658935546875
    },
    "bbox": {
        "min_lat": 46.38940670000000210393409361131489276885986328125,
        "min_lon": 142.649616699999995717007550410926342010498046875,
        "max_lat": 46.40473329999999663186827092431485652923583984375,
        "max_lon": 142.67892829999999548817868344485759735107421875
    },
    "zone_id": "russia_sakhalin_south"
}

Methodology: 2026.01.18

Zone Dwell Prigorodnoye/Sakhalin LNG

May 21, 2026 03:05 UTC 80.0% ▼

Zone: Prigorodnoye/Sakhalin LNG
Duration: 6h 32m
Data Points: 94 AIS positions
Period: 2026-05-21T03:20:39+00:00 to 2026-05-21T09:52:48+00:00

Show Raw Evidence JSON

{
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "dwell_minutes": 392.1000000000000227373675443232059478759765625,
    "points_in_zone": 94,
    "first_point": {
        "ts": "2026-05-21T03:20:39+00:00",
        "lat": 46.35598999999999847432263777591288089752197265625,
        "lon": 142.724473299999999653664417564868927001953125
    },
    "last_point": {
        "ts": "2026-05-21T09:52:48+00:00",
        "lat": 46.4016883000000035508492146618664264678955078125,
        "lon": 142.671283299999998916973709128797054290771484375
    }
}

Methodology: 2026.01.18

Zone Dwell Sakhalin South Approach

May 21, 2026 03:05 UTC 80.0% ▼

Zone: Sakhalin South Approach
Duration: 6h 32m
Data Points: 94 AIS positions
Period: 2026-05-21T03:20:39+00:00 to 2026-05-21T09:52:48+00:00

Show Raw Evidence JSON

{
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "dwell_minutes": 392.1000000000000227373675443232059478759765625,
    "points_in_zone": 94,
    "first_point": {
        "ts": "2026-05-21T03:20:39+00:00",
        "lat": 46.35598999999999847432263777591288089752197265625,
        "lon": 142.724473299999999653664417564868927001953125
    },
    "last_point": {
        "ts": "2026-05-21T09:52:48+00:00",
        "lat": 46.4016883000000035508492146618664264678955078125,
        "lon": 142.671283299999998916973709128797054290771484375
    }
}

Methodology: 2026.01.18

Zone Dwell Sakhalin South Approach

Apr 29, 2026 16:01 UTC 80.0% ▼

Zone: Sakhalin South Approach
Duration: 1h 10m
Data Points: 29 AIS positions
Period: 2026-04-29T16:01:28+00:00 to 2026-04-29T17:12:08+00:00

Show Raw Evidence JSON

{
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "dwell_minutes": 70.7000000000000028421709430404007434844970703125,
    "points_in_zone": 29,
    "first_point": {
        "ts": "2026-04-29T16:01:28+00:00",
        "lat": 46.39079170000000118534444482065737247467041015625,
        "lon": 142.68612500000000409272615797817707061767578125
    },
    "last_point": {
        "ts": "2026-04-29T17:12:08+00:00",
        "lat": 46.29753670000000198569978238083422183990478515625,
        "lon": 142.762906700000002047090674750506877899169921875
    }
}

Methodology: 2026.01.18

Zone Dwell Prigorodnoye/Sakhalin LNG

Apr 29, 2026 16:01 UTC 80.0% ▼

Zone: Prigorodnoye/Sakhalin LNG
Duration: 1h 10m
Data Points: 29 AIS positions
Period: 2026-04-29T16:01:28+00:00 to 2026-04-29T17:12:08+00:00

Show Raw Evidence JSON

{
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "dwell_minutes": 70.7000000000000028421709430404007434844970703125,
    "points_in_zone": 29,
    "first_point": {
        "ts": "2026-04-29T16:01:28+00:00",
        "lat": 46.39079170000000118534444482065737247467041015625,
        "lon": 142.68612500000000409272615797817707061767578125
    },
    "last_point": {
        "ts": "2026-04-29T17:12:08+00:00",
        "lat": 46.29753670000000198569978238083422183990478515625,
        "lon": 142.762906700000002047090674750506877899169921875
    }
}

Methodology: 2026.01.18

Zone Dwell Sakhalin South Approach

Apr 29, 2026 15:01 UTC 80.0% ▼

Zone: Sakhalin South Approach
Duration: 2h 10m
Data Points: 40 AIS positions
Period: 2026-04-29T15:01:44+00:00 to 2026-04-29T17:12:08+00:00

Show Raw Evidence JSON

{
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "dwell_minutes": 130.400000000000005684341886080801486968994140625,
    "points_in_zone": 40,
    "first_point": {
        "ts": "2026-04-29T15:01:44+00:00",
        "lat": 46.4001250000000027284841053187847137451171875,
        "lon": 142.67294670000001133303157985210418701171875
    },
    "last_point": {
        "ts": "2026-04-29T17:12:08+00:00",
        "lat": 46.29753670000000198569978238083422183990478515625,
        "lon": 142.762906700000002047090674750506877899169921875
    }
}

Methodology: 2026.01.18

Zone Dwell Prigorodnoye/Sakhalin LNG

Apr 29, 2026 15:01 UTC 80.0% ▼

Zone: Prigorodnoye/Sakhalin LNG
Duration: 2h 10m
Data Points: 40 AIS positions
Period: 2026-04-29T15:01:44+00:00 to 2026-04-29T17:12:08+00:00

Show Raw Evidence JSON

{
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "dwell_minutes": 130.400000000000005684341886080801486968994140625,
    "points_in_zone": 40,
    "first_point": {
        "ts": "2026-04-29T15:01:44+00:00",
        "lat": 46.4001250000000027284841053187847137451171875,
        "lon": 142.67294670000001133303157985210418701171875
    },
    "last_point": {
        "ts": "2026-04-29T17:12:08+00:00",
        "lat": 46.29753670000000198569978238083422183990478515625,
        "lon": 142.762906700000002047090674750506877899169921875
    }
}

Methodology: 2026.01.18

Zone Dwell Prigorodnoye/Sakhalin LNG

Apr 29, 2026 14:02 UTC 80.0% ▼

Zone: Prigorodnoye/Sakhalin LNG
Duration: 3h 9m
Data Points: 51 AIS positions
Period: 2026-04-29T14:02:16+00:00 to 2026-04-29T17:12:08+00:00

Show Raw Evidence JSON

{
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "dwell_minutes": 189.900000000000005684341886080801486968994140625,
    "points_in_zone": 51,
    "first_point": {
        "ts": "2026-04-29T14:02:16+00:00",
        "lat": 46.4005216999999987592673278413712978363037109375,
        "lon": 142.67396170000000665822881273925304412841796875
    },
    "last_point": {
        "ts": "2026-04-29T17:12:08+00:00",
        "lat": 46.29753670000000198569978238083422183990478515625,
        "lon": 142.762906700000002047090674750506877899169921875
    }
}

Methodology: 2026.01.18

Zone Dwell Sakhalin South Approach

Apr 29, 2026 14:02 UTC 80.0% ▼

Zone: Sakhalin South Approach
Duration: 3h 9m
Data Points: 51 AIS positions
Period: 2026-04-29T14:02:16+00:00 to 2026-04-29T17:12:08+00:00

Show Raw Evidence JSON

{
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "dwell_minutes": 189.900000000000005684341886080801486968994140625,
    "points_in_zone": 51,
    "first_point": {
        "ts": "2026-04-29T14:02:16+00:00",
        "lat": 46.4005216999999987592673278413712978363037109375,
        "lon": 142.67396170000000665822881273925304412841796875
    },
    "last_point": {
        "ts": "2026-04-29T17:12:08+00:00",
        "lat": 46.29753670000000198569978238083422183990478515625,
        "lon": 142.762906700000002047090674750506877899169921875
    }
}

Methodology: 2026.01.18

Loiter Prigorodnoye/Sakhalin LNG

Apr 29, 2026 14:02 UTC 75.0% ▼

Duration: 1h 48m
Radius: 513 meters
Data Points: 21 AIS positions
Centroid: 46.4001, 142.6733
Zone: Prigorodnoye/Sakhalin LNG

Show Raw Evidence JSON

{
    "radius_m": 512.6000000000000227373675443232059478759765625,
    "duration_minutes": 108.599999999999994315658113919198513031005859375,
    "points": 21,
    "centroid": {
        "lat": 46.40006596666665927841677330434322357177734375,
        "lon": 142.6732524571428939452744089066982269287109375
    },
    "bbox": {
        "min_lat": 46.39959669999999647416188963688910007476806640625,
        "min_lon": 142.672335000000003901732270605862140655517578125,
        "max_lat": 46.4005216999999987592673278413712978363037109375,
        "max_lon": 142.67991499999999405190465040504932403564453125
    },
    "zone_id": "russia_prigorodnoye"
}

Methodology: 2026.01.18

Loiter Sakhalin South Approach

Apr 29, 2026 14:02 UTC 75.0% ▼

Duration: 1h 48m
Radius: 513 meters
Data Points: 21 AIS positions
Centroid: 46.4001, 142.6733
Zone: Sakhalin South Approach

Show Raw Evidence JSON

{
    "radius_m": 512.6000000000000227373675443232059478759765625,
    "duration_minutes": 108.599999999999994315658113919198513031005859375,
    "points": 21,
    "centroid": {
        "lat": 46.40006596666665927841677330434322357177734375,
        "lon": 142.6732524571428939452744089066982269287109375
    },
    "bbox": {
        "min_lat": 46.39959669999999647416188963688910007476806640625,
        "min_lon": 142.672335000000003901732270605862140655517578125,
        "max_lat": 46.4005216999999987592673278413712978363037109375,
        "max_lon": 142.67991499999999405190465040504932403564453125
    },
    "zone_id": "russia_sakhalin_south"
}

Methodology: 2026.01.18

Zone Dwell Sakhalin South Approach

Apr 29, 2026 13:03 UTC 80.0% ▼

Zone: Sakhalin South Approach
Duration: 4h 8m
Data Points: 67 AIS positions
Period: 2026-04-29T13:03:27+00:00 to 2026-04-29T17:12:08+00:00

Show Raw Evidence JSON

{
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "dwell_minutes": 248.69999999999998863131622783839702606201171875,
    "points_in_zone": 67,
    "first_point": {
        "ts": "2026-04-29T13:03:27+00:00",
        "lat": 46.3987733000000019956132746301591396331787109375,
        "lon": 142.675803300000012541204341687262058258056640625
    },
    "last_point": {
        "ts": "2026-04-29T17:12:08+00:00",
        "lat": 46.29753670000000198569978238083422183990478515625,
        "lon": 142.762906700000002047090674750506877899169921875
    }
}

Methodology: 2026.01.18

Zone Dwell Prigorodnoye/Sakhalin LNG

Apr 29, 2026 13:03 UTC 80.0% ▼

Zone: Prigorodnoye/Sakhalin LNG
Duration: 4h 8m
Data Points: 67 AIS positions
Period: 2026-04-29T13:03:27+00:00 to 2026-04-29T17:12:08+00:00

Show Raw Evidence JSON

{
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "dwell_minutes": 248.69999999999998863131622783839702606201171875,
    "points_in_zone": 67,
    "first_point": {
        "ts": "2026-04-29T13:03:27+00:00",
        "lat": 46.3987733000000019956132746301591396331787109375,
        "lon": 142.675803300000012541204341687262058258056640625
    },
    "last_point": {
        "ts": "2026-04-29T17:12:08+00:00",
        "lat": 46.29753670000000198569978238083422183990478515625,
        "lon": 142.762906700000002047090674750506877899169921875
    }
}

Methodology: 2026.01.18

Loiter Prigorodnoye/Sakhalin LNG

Apr 29, 2026 13:03 UTC 75.0% ▼

Duration: 2h 55m
Radius: 1,152 meters
Data Points: 38 AIS positions
Centroid: 46.3995, 142.6744
Zone: Prigorodnoye/Sakhalin LNG

Show Raw Evidence JSON

{
    "radius_m": 1152.299999999999954525264911353588104248046875,
    "duration_minutes": 175.80000000000001136868377216160297393798828125,
    "points": 38,
    "centroid": {
        "lat": 46.39946316578947715925096417777240276336669921875,
        "lon": 142.674436310526260740516590885818004608154296875
    },
    "bbox": {
        "min_lat": 46.39224329999999696383383707143366336822509765625,
        "min_lon": 142.672335000000003901732270605862140655517578125,
        "max_lat": 46.4005216999999987592673278413712978363037109375,
        "max_lon": 142.685186700000002701926860027015209197998046875
    },
    "zone_id": "russia_prigorodnoye"
}

Methodology: 2026.01.18

Loiter Sakhalin South Approach

Apr 29, 2026 13:03 UTC 75.0% ▼

Duration: 2h 55m
Radius: 1,152 meters
Data Points: 38 AIS positions
Centroid: 46.3995, 142.6744
Zone: Sakhalin South Approach

Show Raw Evidence JSON

{
    "radius_m": 1152.299999999999954525264911353588104248046875,
    "duration_minutes": 175.80000000000001136868377216160297393798828125,
    "points": 38,
    "centroid": {
        "lat": 46.39946316578947715925096417777240276336669921875,
        "lon": 142.674436310526260740516590885818004608154296875
    },
    "bbox": {
        "min_lat": 46.39224329999999696383383707143366336822509765625,
        "min_lon": 142.672335000000003901732270605862140655517578125,
        "max_lat": 46.4005216999999987592673278413712978363037109375,
        "max_lon": 142.685186700000002701926860027015209197998046875
    },
    "zone_id": "russia_sakhalin_south"
}

Methodology: 2026.01.18

Zone Dwell Sakhalin South Approach

Apr 29, 2026 12:02 UTC 80.0% ▼

Zone: Sakhalin South Approach
Duration: 5h 10m
Data Points: 83 AIS positions
Period: 2026-04-29T12:02:07+00:00 to 2026-04-29T17:12:08+00:00

Show Raw Evidence JSON

{
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "dwell_minutes": 310,
    "points_in_zone": 83,
    "first_point": {
        "ts": "2026-04-29T12:02:07+00:00",
        "lat": 46.39916329999999788924469612538814544677734375,
        "lon": 142.676131700000013324824976734817028045654296875
    },
    "last_point": {
        "ts": "2026-04-29T17:12:08+00:00",
        "lat": 46.29753670000000198569978238083422183990478515625,
        "lon": 142.762906700000002047090674750506877899169921875
    }
}

Methodology: 2026.01.18

Zone Dwell Prigorodnoye/Sakhalin LNG

Apr 29, 2026 12:02 UTC 80.0% ▼

Zone: Prigorodnoye/Sakhalin LNG
Duration: 5h 10m
Data Points: 83 AIS positions
Period: 2026-04-29T12:02:07+00:00 to 2026-04-29T17:12:08+00:00

Show Raw Evidence JSON

{
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "dwell_minutes": 310,
    "points_in_zone": 83,
    "first_point": {
        "ts": "2026-04-29T12:02:07+00:00",
        "lat": 46.39916329999999788924469612538814544677734375,
        "lon": 142.676131700000013324824976734817028045654296875
    },
    "last_point": {
        "ts": "2026-04-29T17:12:08+00:00",
        "lat": 46.29753670000000198569978238083422183990478515625,
        "lon": 142.762906700000002047090674750506877899169921875
    }
}

Methodology: 2026.01.18

Loiter Prigorodnoye/Sakhalin LNG

Apr 29, 2026 12:02 UTC 75.0% ▼

Duration: 3h 57m
Radius: 1,117 meters
Data Points: 54 AIS positions
Centroid: 46.3993, 142.6748
Zone: Prigorodnoye/Sakhalin LNG

Show Raw Evidence JSON

{
    "radius_m": 1117.09999999999990905052982270717620849609375,
    "duration_minutes": 237.19999999999998863131622783839702606201171875,
    "points": 54,
    "centroid": {
        "lat": 46.399279077777777047231211327016353607177734375,
        "lon": 142.674815825925861645373515784740447998046875
    },
    "bbox": {
        "min_lat": 46.39224329999999696383383707143366336822509765625,
        "min_lon": 142.672335000000003901732270605862140655517578125,
        "max_lat": 46.4005216999999987592673278413712978363037109375,
        "max_lon": 142.685186700000002701926860027015209197998046875
    },
    "zone_id": "russia_prigorodnoye"
}

Methodology: 2026.01.18

Loiter Sakhalin South Approach

Apr 29, 2026 12:02 UTC 75.0% ▼

Duration: 3h 57m
Radius: 1,117 meters
Data Points: 54 AIS positions
Centroid: 46.3993, 142.6748
Zone: Sakhalin South Approach

Show Raw Evidence JSON

{
    "radius_m": 1117.09999999999990905052982270717620849609375,
    "duration_minutes": 237.19999999999998863131622783839702606201171875,
    "points": 54,
    "centroid": {
        "lat": 46.399279077777777047231211327016353607177734375,
        "lon": 142.674815825925861645373515784740447998046875
    },
    "bbox": {
        "min_lat": 46.39224329999999696383383707143366336822509765625,
        "min_lon": 142.672335000000003901732270605862140655517578125,
        "max_lat": 46.4005216999999987592673278413712978363037109375,
        "max_lon": 142.685186700000002701926860027015209197998046875
    },
    "zone_id": "russia_sakhalin_south"
}

Methodology: 2026.01.18

Loiter Prigorodnoye/Sakhalin LNG

Apr 29, 2026 11:08 UTC 75.0% ▼

Duration: 4h 50m
Radius: 1,096 meters
Data Points: 70 AIS positions
Centroid: 46.3992, 142.6751
Zone: Prigorodnoye/Sakhalin LNG

Show Raw Evidence JSON

{
    "radius_m": 1096.40000000000009094947017729282379150390625,
    "duration_minutes": 290.6000000000000227373675443232059478759765625,
    "points": 70,
    "centroid": {
        "lat": 46.39920514285714858715437003411352634429931640625,
        "lon": 142.675088898571431172968004830181598663330078125
    },
    "bbox": {
        "min_lat": 46.39224329999999696383383707143366336822509765625,
        "min_lon": 142.672335000000003901732270605862140655517578125,
        "max_lat": 46.4005216999999987592673278413712978363037109375,
        "max_lon": 142.685186700000002701926860027015209197998046875
    },
    "zone_id": "russia_prigorodnoye"
}

Methodology: 2026.01.18

Loiter Sakhalin South Approach

Apr 29, 2026 11:08 UTC 75.0% ▼

Duration: 4h 50m
Radius: 1,096 meters
Data Points: 70 AIS positions
Centroid: 46.3992, 142.6751
Zone: Sakhalin South Approach

Show Raw Evidence JSON

{
    "radius_m": 1096.40000000000009094947017729282379150390625,
    "duration_minutes": 290.6000000000000227373675443232059478759765625,
    "points": 70,
    "centroid": {
        "lat": 46.39920514285714858715437003411352634429931640625,
        "lon": 142.675088898571431172968004830181598663330078125
    },
    "bbox": {
        "min_lat": 46.39224329999999696383383707143366336822509765625,
        "min_lon": 142.672335000000003901732270605862140655517578125,
        "max_lat": 46.4005216999999987592673278413712978363037109375,
        "max_lon": 142.685186700000002701926860027015209197998046875
    },
    "zone_id": "russia_sakhalin_south"
}

Methodology: 2026.01.18

Zone Dwell Sakhalin South Approach

Apr 29, 2026 11:00 UTC 80.0% ▼

Zone: Sakhalin South Approach
Duration: 6h 11m
Data Points: 102 AIS positions
Period: 2026-04-29T11:00:17+00:00 to 2026-04-29T17:12:08+00:00

Show Raw Evidence JSON

{
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "dwell_minutes": 371.8999999999999772626324556767940521240234375,
    "points_in_zone": 102,
    "first_point": {
        "ts": "2026-04-29T11:00:17+00:00",
        "lat": 46.388953299999997170743881724774837493896484375,
        "lon": 142.685349999999999681676854379475116729736328125
    },
    "last_point": {
        "ts": "2026-04-29T17:12:08+00:00",
        "lat": 46.29753670000000198569978238083422183990478515625,
        "lon": 142.762906700000002047090674750506877899169921875
    }
}

Methodology: 2026.01.18

Zone Dwell Prigorodnoye/Sakhalin LNG

Apr 29, 2026 11:00 UTC 80.0% ▼

Zone: Prigorodnoye/Sakhalin LNG
Duration: 6h 11m
Data Points: 102 AIS positions
Period: 2026-04-29T11:00:17+00:00 to 2026-04-29T17:12:08+00:00

Show Raw Evidence JSON

{
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "dwell_minutes": 371.8999999999999772626324556767940521240234375,
    "points_in_zone": 102,
    "first_point": {
        "ts": "2026-04-29T11:00:17+00:00",
        "lat": 46.388953299999997170743881724774837493896484375,
        "lon": 142.685349999999999681676854379475116729736328125
    },
    "last_point": {
        "ts": "2026-04-29T17:12:08+00:00",
        "lat": 46.29753670000000198569978238083422183990478515625,
        "lon": 142.762906700000002047090674750506877899169921875
    }
}

Methodology: 2026.01.18

Loiter Prigorodnoye/Sakhalin LNG

Apr 29, 2026 10:58 UTC 75.0% ▼

Duration: 5h 3m
Radius: 1,626 meters
Data Points: 75 AIS positions
Centroid: 46.3986, 142.6757
Zone: Prigorodnoye/Sakhalin LNG

Show Raw Evidence JSON

{
    "radius_m": 1625.5,
    "duration_minutes": 303.19999999999998863131622783839702606201171875,
    "points": 75,
    "centroid": {
        "lat": 46.398606577333339373581111431121826171875,
        "lon": 142.675735016000004407032974995672702789306640625
    },
    "bbox": {
        "min_lat": 46.38634330000000005611582309938967227935791015625,
        "min_lon": 142.672335000000003901732270605862140655517578125,
        "max_lat": 46.4005216999999987592673278413712978363037109375,
        "max_lon": 142.687248299999993150777299888432025909423828125
    },
    "zone_id": "russia_prigorodnoye"
}

Methodology: 2026.01.18

Loiter Sakhalin South Approach

Apr 29, 2026 10:58 UTC 75.0% ▼

Duration: 5h 3m
Radius: 1,626 meters
Data Points: 75 AIS positions
Centroid: 46.3986, 142.6757
Zone: Sakhalin South Approach

Show Raw Evidence JSON

{
    "radius_m": 1625.5,
    "duration_minutes": 303.19999999999998863131622783839702606201171875,
    "points": 75,
    "centroid": {
        "lat": 46.398606577333339373581111431121826171875,
        "lon": 142.675735016000004407032974995672702789306640625
    },
    "bbox": {
        "min_lat": 46.38634330000000005611582309938967227935791015625,
        "min_lon": 142.672335000000003901732270605862140655517578125,
        "max_lat": 46.4005216999999987592673278413712978363037109375,
        "max_lon": 142.687248299999993150777299888432025909423828125
    },
    "zone_id": "russia_sakhalin_south"
}

Methodology: 2026.01.18

Zone Dwell Sakhalin South Approach

Apr 29, 2026 10:13 UTC 80.0% ▼

Zone: Sakhalin South Approach
Duration: 6h 31m
Data Points: 111 AIS positions
Period: 2026-04-29T10:41:08+00:00 to 2026-04-29T17:12:08+00:00

Show Raw Evidence JSON

{
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "dwell_minutes": 391,
    "points_in_zone": 111,
    "first_point": {
        "ts": "2026-04-29T10:41:08+00:00",
        "lat": 46.35232669999999899346221354790031909942626953125,
        "lon": 142.695963299999988294075592420995235443115234375
    },
    "last_point": {
        "ts": "2026-04-29T17:12:08+00:00",
        "lat": 46.29753670000000198569978238083422183990478515625,
        "lon": 142.762906700000002047090674750506877899169921875
    }
}

Methodology: 2026.01.18

Zone Dwell Prigorodnoye/Sakhalin LNG

Apr 29, 2026 10:13 UTC 80.0% ▼

Zone: Prigorodnoye/Sakhalin LNG
Duration: 6h 31m
Data Points: 111 AIS positions
Period: 2026-04-29T10:41:08+00:00 to 2026-04-29T17:12:08+00:00

Show Raw Evidence JSON

{
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "dwell_minutes": 391,
    "points_in_zone": 111,
    "first_point": {
        "ts": "2026-04-29T10:41:08+00:00",
        "lat": 46.35232669999999899346221354790031909942626953125,
        "lon": 142.695963299999988294075592420995235443115234375
    },
    "last_point": {
        "ts": "2026-04-29T17:12:08+00:00",
        "lat": 46.29753670000000198569978238083422183990478515625,
        "lon": 142.762906700000002047090674750506877899169921875
    }
}

Methodology: 2026.01.18

Zone Dwell Prigorodnoye/Sakhalin LNG

Apr 29, 2026 08:02 UTC 80.0% ▼

Zone: Prigorodnoye/Sakhalin LNG
Duration: 6h 36m
Data Points: 83 AIS positions
Period: 2026-04-29T08:02:37+00:00 to 2026-04-29T14:39:17+00:00

Show Raw Evidence JSON

{
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "dwell_minutes": 396.69999999999998863131622783839702606201171875,
    "points_in_zone": 83,
    "first_point": {
        "ts": "2026-04-29T08:02:37+00:00",
        "lat": 46.2534016999999977315383148379623889923095703125,
        "lon": 142.6955067000000099142198450863361358642578125
    },
    "last_point": {
        "ts": "2026-04-29T14:39:17+00:00",
        "lat": 46.40010670000000203572199097834527492523193359375,
        "lon": 142.67261999999999488863977603614330291748046875
    }
}

Methodology: 2026.01.18

Zone Dwell Sakhalin South Approach

Apr 29, 2026 08:02 UTC 80.0% ▼

Zone: Sakhalin South Approach
Duration: 6h 36m
Data Points: 83 AIS positions
Period: 2026-04-29T08:02:37+00:00 to 2026-04-29T14:39:17+00:00

Show Raw Evidence JSON

{
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "dwell_minutes": 396.69999999999998863131622783839702606201171875,
    "points_in_zone": 83,
    "first_point": {
        "ts": "2026-04-29T08:02:37+00:00",
        "lat": 46.2534016999999977315383148379623889923095703125,
        "lon": 142.6955067000000099142198450863361358642578125
    },
    "last_point": {
        "ts": "2026-04-29T14:39:17+00:00",
        "lat": 46.40010670000000203572199097834527492523193359375,
        "lon": 142.67261999999999488863977603614330291748046875
    }
}

Methodology: 2026.01.18

Zone Dwell Prigorodnoye/Sakhalin LNG

Apr 29, 2026 07:43 UTC 80.0% ▼

Zone: Prigorodnoye/Sakhalin LNG
Duration: 6h 34m
Data Points: 83 AIS positions
Period: 2026-04-29T07:43:57+00:00 to 2026-04-29T14:18:37+00:00

Show Raw Evidence JSON

{
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "dwell_minutes": 394.69999999999998863131622783839702606201171875,
    "points_in_zone": 83,
    "first_point": {
        "ts": "2026-04-29T07:43:57+00:00",
        "lat": 46.25328999999999979308995534665882587432861328125,
        "lon": 142.69560830000000350992195308208465576171875
    },
    "last_point": {
        "ts": "2026-04-29T14:18:37+00:00",
        "lat": 46.400111699999996517362887971103191375732421875,
        "lon": 142.6725999999999885403667576611042022705078125
    }
}

Methodology: 2026.01.18

Zone Dwell Sakhalin South Approach

Apr 29, 2026 07:43 UTC 80.0% ▼

Zone: Sakhalin South Approach
Duration: 6h 34m
Data Points: 83 AIS positions
Period: 2026-04-29T07:43:57+00:00 to 2026-04-29T14:18:37+00:00

Show Raw Evidence JSON

{
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "dwell_minutes": 394.69999999999998863131622783839702606201171875,
    "points_in_zone": 83,
    "first_point": {
        "ts": "2026-04-29T07:43:57+00:00",
        "lat": 46.25328999999999979308995534665882587432861328125,
        "lon": 142.69560830000000350992195308208465576171875
    },
    "last_point": {
        "ts": "2026-04-29T14:18:37+00:00",
        "lat": 46.400111699999996517362887971103191375732421875,
        "lon": 142.6725999999999885403667576611042022705078125
    }
}

Methodology: 2026.01.18

Zone Dwell Sakhalin South Approach

Apr 29, 2026 06:45 UTC 80.0% ▼

Zone: Sakhalin South Approach
Duration: 6h 29m
Data Points: 71 AIS positions
Period: 2026-04-29T06:57:47+00:00 to 2026-04-29T13:26:58+00:00

Show Raw Evidence JSON

{
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "dwell_minutes": 389.19999999999998863131622783839702606201171875,
    "points_in_zone": 71,
    "first_point": {
        "ts": "2026-04-29T06:57:47+00:00",
        "lat": 46.25378829999999652500264346599578857421875,
        "lon": 142.69467670000000225627445615828037261962890625
    },
    "last_point": {
        "ts": "2026-04-29T13:26:58+00:00",
        "lat": 46.398809999999997444319888018071651458740234375,
        "lon": 142.675158299999992550510796718299388885498046875
    }
}

Methodology: 2026.01.18

Zone Dwell Prigorodnoye/Sakhalin LNG

Apr 29, 2026 06:45 UTC 80.0% ▼

Zone: Prigorodnoye/Sakhalin LNG
Duration: 6h 29m
Data Points: 71 AIS positions
Period: 2026-04-29T06:57:47+00:00 to 2026-04-29T13:26:58+00:00

Show Raw Evidence JSON

{
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "dwell_minutes": 389.19999999999998863131622783839702606201171875,
    "points_in_zone": 71,
    "first_point": {
        "ts": "2026-04-29T06:57:47+00:00",
        "lat": 46.25378829999999652500264346599578857421875,
        "lon": 142.69467670000000225627445615828037261962890625
    },
    "last_point": {
        "ts": "2026-04-29T13:26:58+00:00",
        "lat": 46.398809999999997444319888018071651458740234375,
        "lon": 142.675158299999992550510796718299388885498046875
    }
}

Methodology: 2026.01.18

Zone Dwell Sakhalin South Approach

Apr 29, 2026 05:02 UTC 80.0% ▼

Zone: Sakhalin South Approach
Duration: 6h 33m
Data Points: 56 AIS positions
Period: 2026-04-29T05:53:48+00:00 to 2026-04-29T12:27:18+00:00

Show Raw Evidence JSON

{
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "dwell_minutes": 393.5,
    "points_in_zone": 56,
    "first_point": {
        "ts": "2026-04-29T05:53:48+00:00",
        "lat": 46.2540350000000017871570889838039875030517578125,
        "lon": 142.69301669999998694038367830216884613037109375
    },
    "last_point": {
        "ts": "2026-04-29T12:27:18+00:00",
        "lat": 46.39876000000000288991941488347947597503662109375,
        "lon": 142.67541829999998981293174438178539276123046875
    }
}

Methodology: 2026.01.18

Zone Dwell Prigorodnoye/Sakhalin LNG

Apr 29, 2026 05:02 UTC 80.0% ▼

Zone: Prigorodnoye/Sakhalin LNG
Duration: 6h 33m
Data Points: 56 AIS positions
Period: 2026-04-29T05:53:48+00:00 to 2026-04-29T12:27:18+00:00

Show Raw Evidence JSON

{
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "dwell_minutes": 393.5,
    "points_in_zone": 56,
    "first_point": {
        "ts": "2026-04-29T05:53:48+00:00",
        "lat": 46.2540350000000017871570889838039875030517578125,
        "lon": 142.69301669999998694038367830216884613037109375
    },
    "last_point": {
        "ts": "2026-04-29T12:27:18+00:00",
        "lat": 46.39876000000000288991941488347947597503662109375,
        "lon": 142.67541829999998981293174438178539276123046875
    }
}

Methodology: 2026.01.18

Loiter Prigorodnoye/Sakhalin LNG

Apr 29, 2026 05:02 UTC 75.0% ▼

Duration: 3 hours
Radius: 237 meters
Data Points: 24 AIS positions
Centroid: 46.2538, 142.6926
Zone: Prigorodnoye/Sakhalin LNG

Show Raw Evidence JSON

{
    "radius_m": 237,
    "duration_minutes": 180.5,
    "points": 24,
    "centroid": {
        "lat": 46.25381396666666233841169741936028003692626953125,
        "lon": 142.69262888750000684012775309383869171142578125
    },
    "bbox": {
        "min_lat": 46.25328999999999979308995534665882587432861328125,
        "min_lon": 142.6916449999999940700945444405078887939453125,
        "max_lat": 46.2540350000000017871570889838039875030517578125,
        "max_lon": 142.69560830000000350992195308208465576171875
    },
    "zone_id": "russia_prigorodnoye"
}

Methodology: 2026.01.18

Loiter Sakhalin South Approach

Apr 29, 2026 05:02 UTC 75.0% ▼

Duration: 3 hours
Radius: 237 meters
Data Points: 24 AIS positions
Centroid: 46.2538, 142.6926
Zone: Sakhalin South Approach

Show Raw Evidence JSON

{
    "radius_m": 237,
    "duration_minutes": 180.5,
    "points": 24,
    "centroid": {
        "lat": 46.25381396666666233841169741936028003692626953125,
        "lon": 142.69262888750000684012775309383869171142578125
    },
    "bbox": {
        "min_lat": 46.25328999999999979308995534665882587432861328125,
        "min_lon": 142.6916449999999940700945444405078887939453125,
        "max_lat": 46.2540350000000017871570889838039875030517578125,
        "max_lon": 142.69560830000000350992195308208465576171875
    },
    "zone_id": "russia_sakhalin_south"
}

Methodology: 2026.01.18

Zone Dwell Sakhalin South Approach

Apr 29, 2026 04:05 UTC 80.0% ▼

Zone: Sakhalin South Approach
Duration: 6h 37m
Data Points: 63 AIS positions
Period: 2026-04-29T04:51:47+00:00 to 2026-04-29T11:29:08+00:00

Show Raw Evidence JSON

{
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "dwell_minutes": 397.3999999999999772626324556767940521240234375,
    "points_in_zone": 63,
    "first_point": {
        "ts": "2026-04-29T04:51:47+00:00",
        "lat": 46.2537999999999982492226990871131420135498046875,
        "lon": 142.691785000000010086296242661774158477783203125
    },
    "last_point": {
        "ts": "2026-04-29T11:29:08+00:00",
        "lat": 46.39912170000000202207957045175135135650634765625,
        "lon": 142.674871700000011287556844763457775115966796875
    }
}

Methodology: 2026.01.18

Zone Dwell Prigorodnoye/Sakhalin LNG

Apr 29, 2026 04:05 UTC 80.0% ▼

Zone: Prigorodnoye/Sakhalin LNG
Duration: 6h 37m
Data Points: 63 AIS positions
Period: 2026-04-29T04:51:47+00:00 to 2026-04-29T11:29:08+00:00

Show Raw Evidence JSON

{
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "dwell_minutes": 397.3999999999999772626324556767940521240234375,
    "points_in_zone": 63,
    "first_point": {
        "ts": "2026-04-29T04:51:47+00:00",
        "lat": 46.2537999999999982492226990871131420135498046875,
        "lon": 142.691785000000010086296242661774158477783203125
    },
    "last_point": {
        "ts": "2026-04-29T11:29:08+00:00",
        "lat": 46.39912170000000202207957045175135135650634765625,
        "lon": 142.674871700000011287556844763457775115966796875
    }
}

Methodology: 2026.01.18

Loiter Prigorodnoye/Sakhalin LNG

Apr 29, 2026 04:05 UTC 75.0% ▼

Duration: 3h 57m
Radius: 259 meters
Data Points: 41 AIS positions
Centroid: 46.2538, 142.6923
Zone: Prigorodnoye/Sakhalin LNG

Show Raw Evidence JSON

{
    "radius_m": 259.30000000000001136868377216160297393798828125,
    "duration_minutes": 237,
    "points": 41,
    "centroid": {
        "lat": 46.2538348853658618509143707342445850372314453125,
        "lon": 142.69233869756095600678236223757266998291015625
    },
    "bbox": {
        "min_lat": 46.25328999999999979308995534665882587432861328125,
        "min_lon": 142.6916449999999940700945444405078887939453125,
        "max_lat": 46.2540350000000017871570889838039875030517578125,
        "max_lon": 142.69560830000000350992195308208465576171875
    },
    "zone_id": "russia_prigorodnoye"
}

Methodology: 2026.01.18

Loiter Sakhalin South Approach

Apr 29, 2026 04:05 UTC 75.0% ▼

Duration: 3h 57m
Radius: 259 meters
Data Points: 41 AIS positions
Centroid: 46.2538, 142.6923
Zone: Sakhalin South Approach

Show Raw Evidence JSON

{
    "radius_m": 259.30000000000001136868377216160297393798828125,
    "duration_minutes": 237,
    "points": 41,
    "centroid": {
        "lat": 46.2538348853658618509143707342445850372314453125,
        "lon": 142.69233869756095600678236223757266998291015625
    },
    "bbox": {
        "min_lat": 46.25328999999999979308995534665882587432861328125,
        "min_lon": 142.6916449999999940700945444405078887939453125,
        "max_lat": 46.2540350000000017871570889838039875030517578125,
        "max_lon": 142.69560830000000350992195308208465576171875
    },
    "zone_id": "russia_sakhalin_south"
}

Methodology: 2026.01.18

Zone Dwell Prigorodnoye/Sakhalin LNG

Apr 29, 2026 03:00 UTC 80.0% ▼

Zone: Prigorodnoye/Sakhalin LNG
Duration: 6h 39m
Data Points: 55 AIS positions
Period: 2026-04-29T03:50:39+00:00 to 2026-04-29T10:29:37+00:00

Show Raw Evidence JSON

{
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "dwell_minutes": 399,
    "points_in_zone": 55,
    "first_point": {
        "ts": "2026-04-29T03:50:39+00:00",
        "lat": 46.25385330000000294603523798286914825439453125,
        "lon": 142.69193000000001347871148027479648590087890625
    },
    "last_point": {
        "ts": "2026-04-29T10:29:37+00:00",
        "lat": 46.32314000000000220325091504491865634918212890625,
        "lon": 142.698720000000008667484507896006107330322265625
    }
}

Methodology: 2026.01.18

Zone Dwell Sakhalin South Approach

Apr 29, 2026 03:00 UTC 80.0% ▼

Zone: Sakhalin South Approach
Duration: 6h 39m
Data Points: 55 AIS positions
Period: 2026-04-29T03:50:39+00:00 to 2026-04-29T10:29:37+00:00

Show Raw Evidence JSON

{
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "dwell_minutes": 399,
    "points_in_zone": 55,
    "first_point": {
        "ts": "2026-04-29T03:50:39+00:00",
        "lat": 46.25385330000000294603523798286914825439453125,
        "lon": 142.69193000000001347871148027479648590087890625
    },
    "last_point": {
        "ts": "2026-04-29T10:29:37+00:00",
        "lat": 46.32314000000000220325091504491865634918212890625,
        "lon": 142.698720000000008667484507896006107330322265625
    }
}

Methodology: 2026.01.18

Loiter Prigorodnoye/Sakhalin LNG

Apr 29, 2026 03:00 UTC 75.0% ▼

Duration: 5h 1m
Radius: 265 meters
Data Points: 59 AIS positions
Centroid: 46.2538, 142.6923
Zone: Prigorodnoye/Sakhalin LNG

Show Raw Evidence JSON

{
    "radius_m": 264.69999999999998863131622783839702606201171875,
    "duration_minutes": 301.6000000000000227373675443232059478759765625,
    "points": 59,
    "centroid": {
        "lat": 46.25384749152541274952454841695725917816162109375,
        "lon": 142.692271099999970829230733215808868408203125
    },
    "bbox": {
        "min_lat": 46.25328999999999979308995534665882587432861328125,
        "min_lon": 142.6916449999999940700945444405078887939453125,
        "max_lat": 46.2540350000000017871570889838039875030517578125,
        "max_lon": 142.69560830000000350992195308208465576171875
    },
    "zone_id": "russia_prigorodnoye"
}

Methodology: 2026.01.18

Loiter Sakhalin South Approach

Apr 29, 2026 03:00 UTC 75.0% ▼

Duration: 5h 1m
Radius: 265 meters
Data Points: 59 AIS positions
Centroid: 46.2538, 142.6923
Zone: Sakhalin South Approach

Show Raw Evidence JSON

{
    "radius_m": 264.69999999999998863131622783839702606201171875,
    "duration_minutes": 301.6000000000000227373675443232059478759765625,
    "points": 59,
    "centroid": {
        "lat": 46.25384749152541274952454841695725917816162109375,
        "lon": 142.692271099999970829230733215808868408203125
    },
    "bbox": {
        "min_lat": 46.25328999999999979308995534665882587432861328125,
        "min_lon": 142.6916449999999940700945444405078887939453125,
        "max_lat": 46.2540350000000017871570889838039875030517578125,
        "max_lon": 142.69560830000000350992195308208465576171875
    },
    "zone_id": "russia_sakhalin_south"
}

Methodology: 2026.01.18

Zone Dwell Prigorodnoye/Sakhalin LNG

Apr 29, 2026 02:05 UTC 80.0% ▼

Zone: Prigorodnoye/Sakhalin LNG
Duration: 5h 57m
Data Points: 66 AIS positions
Period: 2026-04-29T02:05:38+00:00 to 2026-04-29T08:02:37+00:00

Show Raw Evidence JSON

{
    "zone_id": "russia_prigorodnoye",
    "zone_name": "Prigorodnoye\/Sakhalin LNG",
    "dwell_minutes": 357,
    "points_in_zone": 66,
    "first_point": {
        "ts": "2026-04-29T02:05:38+00:00",
        "lat": 46.25371830000000272775650955736637115478515625,
        "lon": 142.691605000000009795257938094437122344970703125
    },
    "last_point": {
        "ts": "2026-04-29T08:02:37+00:00",
        "lat": 46.2534016999999977315383148379623889923095703125,
        "lon": 142.6955067000000099142198450863361358642578125
    }
}

Methodology: 2026.01.18

Zone Dwell Sakhalin South Approach

Apr 29, 2026 02:05 UTC 80.0% ▼

Zone: Sakhalin South Approach
Duration: 5h 57m
Data Points: 66 AIS positions
Period: 2026-04-29T02:05:38+00:00 to 2026-04-29T08:02:37+00:00

Show Raw Evidence JSON

{
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "dwell_minutes": 357,
    "points_in_zone": 66,
    "first_point": {
        "ts": "2026-04-29T02:05:38+00:00",
        "lat": 46.25371830000000272775650955736637115478515625,
        "lon": 142.691605000000009795257938094437122344970703125
    },
    "last_point": {
        "ts": "2026-04-29T08:02:37+00:00",
        "lat": 46.2534016999999977315383148379623889923095703125,
        "lon": 142.6955067000000099142198450863361358642578125
    }
}

Methodology: 2026.01.18

Recent Position Data

Time (UTC)	Lat	Lon	Speed	Course	Zone
Jun 4 09:09	46.2404	142.8475	10.2 kn	150.0°	Prigorodnoye/Sakhalin LNG
Jun 4 08:31	46.3350	142.7696	10.4 kn	156.8°	Prigorodnoye/Sakhalin LNG
Jun 4 08:30	46.3389	142.7672	10.4 kn	157.1°	Prigorodnoye/Sakhalin LNG
Jun 4 08:28	46.3426	142.7649	10.4 kn	156.0°	Prigorodnoye/Sakhalin LNG
Jun 4 08:26	46.3474	142.7620	10.3 kn	158.4°	Prigorodnoye/Sakhalin LNG
Jun 4 08:23	46.3554	142.7575	10.0 kn	158.0°	Prigorodnoye/Sakhalin LNG
Jun 4 08:22	46.3579	142.7560	9.9 kn	158.9°	Prigorodnoye/Sakhalin LNG
Jun 4 08:20	46.3635	142.7529	9.5 kn	158.8°	Prigorodnoye/Sakhalin LNG
Jun 4 08:16	46.3735	142.7474	8.9 kn	159.1°	Prigorodnoye/Sakhalin LNG
Jun 4 08:15	46.3758	142.7462	8.8 kn	160.2°	Prigorodnoye/Sakhalin LNG
Jun 4 08:13	46.3803	142.7438	8.6 kn	160.4°	Prigorodnoye/Sakhalin LNG
Jun 4 08:12	46.3826	142.7427	8.4 kn	161.3°	Prigorodnoye/Sakhalin LNG
Jun 4 08:10	46.3876	142.7401	8.2 kn	163.2°	Prigorodnoye/Sakhalin LNG
Jun 4 08:09	46.3898	142.7391	7.8 kn	159.9°	Prigorodnoye/Sakhalin LNG
Jun 4 08:07	46.3940	142.7368	6.9 kn	159.5°	Prigorodnoye/Sakhalin LNG
Jun 4 08:04	46.3977	142.7346	4.0 kn	142.2°	Prigorodnoye/Sakhalin LNG
Jun 4 08:02	46.3981	142.7322	2.8 kn	66.3°	Prigorodnoye/Sakhalin LNG
Jun 4 07:59	46.3976	142.7311	0.1 kn	283.0°	Prigorodnoye/Sakhalin LNG
Jun 4 07:52	46.3976	142.7315	0.2 kn	248.4°	Prigorodnoye/Sakhalin LNG
Jun 4 07:49	46.3977	142.7314	0.1 kn	242.0°	Prigorodnoye/Sakhalin LNG

Showing 20 of 100 recent positions.

Data Source

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

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

Speed 10.20 kn

Course 150.00°

Zone Prigorodnoye/Sakhalin LNG

Last Position 21 hours ago

PERSEY

IMO 9043794

Vessel information

Detected Events (100)

Confidence Analysis

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🛰️ Satellite Corroboration

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🛰️ Satellite Corroboration

Confidence Analysis

🛰️ Satellite Corroboration

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🛰️ Satellite Corroboration

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