SUNGJIN ACE

Vessel information

Vessel Name SUNGJIN ACE
MMSI 440156960
Vessel Type Tanker
Flag 🏳️ REPUBLIC OF KOREA
Call Sign SSD
Length 29 m
Beam 7 m

Detected Events (17)

Sts Strait of Gibraltar Surveillance Zone
Jul 18, 2026 23:23 UTC 82/100 ▼
Vessel A: MMSI 440156960 (SUNGJIN ACE) REPUBLIC OF KOREA
Vessel B: IMO 9281176 (WOOWONHO) REPUBLIC OF KOREA
  • Minimum Distance: 39 meters
  • Average Distance: 65 meters
  • Duration: 1h 17m
  • Period: 2026-07-18T23:24:17+00:00 to 2026-07-19T00:41:18+00:00
  • Vessel A Avg Speed: 0.3 knots
  • Vessel B Avg Speed: 0.1 knots
  • Zone: Strait of Gibraltar Surveillance Zone

Confidence Analysis

Score: 82/100

High-confidence STS candidate. Two tankers (SUNGJIN ACE and WOOWONHO) maintained close proximity (min 38m, avg 65m) for 77 minutes. Both vessels were slow-moving (avg speeds 0.3 and 0.1 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Strait of Gibraltar Surveillance Zone, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness25/25Min distance 38m, avg 65m
Duration15/25Duration 77 minutes
Speed Stability17/20both nearly stationary; stable speeds
Distance Consistency15/15Distance variance ±10m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Strait of Gibraltar Surveillance Zone
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 440156960,
        "name": "SUNGJIN ACE",
        "flag": "REPUBLIC OF KOREA"
    },
    "vessel_b": {
        "mmsi": 440400900,
        "imo": 9281176,
        "name": "WOOWONHO",
        "flag": "REPUBLIC OF KOREA"
    },
    "min_distance_m": 38.5,
    "avg_distance_m": 65.2000000000000028421709430404007434844970703125,
    "distance_consistency_m": 10.5,
    "duration_minutes": 77,
    "overlap_duration_s": 4621,
    "speed_a_avg": 0.2800000000000000266453525910037569701671600341796875,
    "speed_a_std": 0.460000000000000019984014443252817727625370025634765625,
    "speed_b_avg": 0.059999999999999997779553950749686919152736663818359375,
    "speed_b_std": 0.070000000000000006661338147750939242541790008544921875,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.2800000000000000266453525910037569701671600341796875,
            "max_sog": 1.5
        },
        "vessel_b": {
            "avg_sog": 0.059999999999999997779553950749686919152736663818359375,
            "max_sog": 0.200000000000000011102230246251565404236316680908203125
        }
    },
    "time_window": {
        "start": "2026-07-18T23:24:17+00:00",
        "end": "2026-07-19T00:41:18+00:00"
    },
    "points_count": {
        "vessel_a": 9,
        "vessel_b": 9
    },
    "zone_id": "discovered_001",
    "zone_name": "Strait of Gibraltar Surveillance Zone",
    "score": {
        "value": 82,
        "components": {
            "distance_tightness": {
                "score": 25,
                "max": 25,
                "detail": "Min distance 38m, avg 65m"
            },
            "duration": {
                "score": 15,
                "max": 25,
                "detail": "Duration 77 minutes"
            },
            "speed_stability": {
                "score": 17,
                "max": 20,
                "detail": "both nearly stationary; stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b110m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Strait of Gibraltar Surveillance Zone"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (SUNGJIN ACE and WOOWONHO) maintained close proximity (min 38m, avg 65m) for 77 minutes. Both vessels were slow-moving (avg speeds 0.3 and 0.1 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Strait of Gibraltar Surveillance Zone, a known STS activity area."
    }
}
Methodology: 2026.01.18
Zone Dwell Strait of Gibraltar Surveillance Zone
Jul 18, 2026 23:21 UTC 80.0% ▼
  • Zone: Strait of Gibraltar Surveillance Zone
  • Duration: 1h 19m
  • Data Points: 11 AIS positions
  • Period: 2026-07-18T23:21:38+00:00 to 2026-07-19T00:41:18+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_001",
    "zone_name": "Strait of Gibraltar Surveillance Zone",
    "dwell_minutes": 79.7000000000000028421709430404007434844970703125,
    "points_in_zone": 11,
    "first_point": {
        "ts": "2026-07-18T23:21:38+00:00",
        "lat": 35.02834829999999755045791971497237682342529296875,
        "lon": 129.068299999999993588062352500855922698974609375
    },
    "last_point": {
        "ts": "2026-07-19T00:41:18+00:00",
        "lat": 35.02890000000000014779288903810083866119384765625,
        "lon": 129.069783300000011649899533949792385101318359375
    }
}
Methodology: 2026.01.18
Zone Dwell Strait of Gibraltar Surveillance Zone
Jul 17, 2026 00:04 UTC 80.0% ▼
  • Zone: Strait of Gibraltar Surveillance Zone
  • Duration: 1h 20m
  • Data Points: 20 AIS positions
  • Period: 2026-07-17T00:04:15+00:00 to 2026-07-17T01:24:57+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_001",
    "zone_name": "Strait of Gibraltar Surveillance Zone",
    "dwell_minutes": 80.7000000000000028421709430404007434844970703125,
    "points_in_zone": 20,
    "first_point": {
        "ts": "2026-07-17T00:04:15+00:00",
        "lat": 35.01291669999999811579982633702456951141357421875,
        "lon": 129.051233300000006920527084730565547943115234375
    },
    "last_point": {
        "ts": "2026-07-17T01:24:57+00:00",
        "lat": 35.02758330000000341897248290479183197021484375,
        "lon": 129.04595000000000482032191939651966094970703125
    }
}
Methodology: 2026.01.18
Zone Dwell Strait of Gibraltar Surveillance Zone
Jul 16, 2026 23:36 UTC 80.0% ▼
  • Zone: Strait of Gibraltar Surveillance Zone
  • Duration: 1h 48m
  • Data Points: 24 AIS positions
  • Period: 2026-07-16T23:36:16+00:00 to 2026-07-17T01:24:57+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_001",
    "zone_name": "Strait of Gibraltar Surveillance Zone",
    "dwell_minutes": 108.7000000000000028421709430404007434844970703125,
    "points_in_zone": 24,
    "first_point": {
        "ts": "2026-07-16T23:36:16+00:00",
        "lat": 35.02384829999999737992766313254833221435546875,
        "lon": 129.046798300000006065602065064013004302978515625
    },
    "last_point": {
        "ts": "2026-07-17T01:24:57+00:00",
        "lat": 35.02758330000000341897248290479183197021484375,
        "lon": 129.04595000000000482032191939651966094970703125
    }
}
Methodology: 2026.01.18
Loiter Strait of Gibraltar Surveillance Zone
Jul 16, 2026 23:36 UTC 75.0% ▼
  • Duration: 1h 35m
  • Radius: 1,232 meters
  • Data Points: 23 AIS positions
  • Centroid: 35.0134, 129.0514
  • Zone: Strait of Gibraltar Surveillance Zone
Show Raw Evidence JSON
{
    "radius_m": 1231.799999999999954525264911353588104248046875,
    "duration_minutes": 95.7000000000000028421709430404007434844970703125,
    "points": 23,
    "centroid": {
        "lat": 35.0134082478260921789114945568144321441650390625,
        "lon": 129.051393404347805926590808667242527008056640625
    },
    "bbox": {
        "min_lat": 35.0120332999999988032868714071810245513916015625,
        "min_lon": 129.046798300000006065602065064013004302978515625,
        "max_lat": 35.02384829999999737992766313254833221435546875,
        "max_lon": 129.0526833000000124229700304567813873291015625
    },
    "zone_id": "discovered_001"
}
Methodology: 2026.01.18
Zone Dwell Strait of Gibraltar Surveillance Zone
Jul 16, 2026 03:05 UTC 80.0% ▼
  • Zone: Strait of Gibraltar Surveillance Zone
  • Duration: 1h 2m
  • Data Points: 13 AIS positions
  • Period: 2026-07-16T03:05:09+00:00 to 2026-07-16T04:07:10+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_001",
    "zone_name": "Strait of Gibraltar Surveillance Zone",
    "dwell_minutes": 62,
    "points_in_zone": 13,
    "first_point": {
        "ts": "2026-07-16T03:05:09+00:00",
        "lat": 35.029283300000003009699867106974124908447265625,
        "lon": 129.0736666999999897598172537982463836669921875
    },
    "last_point": {
        "ts": "2026-07-16T04:07:10+00:00",
        "lat": 35.02916669999999754736563772894442081451416015625,
        "lon": 129.073700000000002319211489520967006683349609375
    }
}
Methodology: 2026.01.18
Sts🛰️✗ Strait of Gibraltar Surveillance Zone
Jul 16, 2026 02:01 UTC 72/100 ▼
Vessel A: MMSI 440112380 (KUKDONG3HO) REPUBLIC OF KOREA
Vessel B: MMSI 440156960 (SUNGJIN ACE) REPUBLIC OF KOREA
  • Minimum Distance: 54 meters
  • Average Distance: 60 meters
  • Duration: 30 minutes
  • Period: 2026-07-16T02:01:33+00:00 to 2026-07-16T02:31:53+00:00
  • Vessel A Avg Speed: 0.4 knots
  • Vessel B Avg Speed: 0.1 knots
  • Zone: Strait of Gibraltar Surveillance Zone

Confidence Analysis

Score: 72/100

Moderate-confidence STS candidate. Two tankers (KUKDONG3HO and SUNGJIN ACE) maintained close proximity (min 54m, avg 60m) for 30 minutes. Both vessels were slow-moving (avg speeds 0.4 and 0.1 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Strait of Gibraltar Surveillance Zone, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness25/25Min distance 54m, avg 60m
Duration5/25Duration 30 minutes
Speed Stability17/20both nearly stationary; stable speeds
Distance Consistency15/15Distance variance ±5m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Strait of Gibraltar Surveillance Zone

🛰️ Satellite Corroboration

✗ SAR Not Available

No satellite imagery for this time/location

No Sentinel-1 scenes covering AOI and time window

Searched: 2026-07-16T08:45:12.149112+00:00

Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 440112380,
        "name": "KUKDONG3HO",
        "flag": "REPUBLIC OF KOREA"
    },
    "vessel_b": {
        "mmsi": 440156960,
        "name": "SUNGJIN ACE",
        "flag": "REPUBLIC OF KOREA"
    },
    "min_distance_m": 54.10000000000000142108547152020037174224853515625,
    "avg_distance_m": 60.10000000000000142108547152020037174224853515625,
    "distance_consistency_m": 4.5999999999999996447286321199499070644378662109375,
    "duration_minutes": 30.300000000000000710542735760100185871124267578125,
    "overlap_duration_s": 1820,
    "speed_a_avg": 0.440000000000000002220446049250313080847263336181640625,
    "speed_a_std": 0.450000000000000011102230246251565404236316680908203125,
    "speed_b_avg": 0.11999999999999999555910790149937383830547332763671875,
    "speed_b_std": 0.05000000000000000277555756156289135105907917022705078125,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.440000000000000002220446049250313080847263336181640625,
            "max_sog": 1.5
        },
        "vessel_b": {
            "avg_sog": 0.11999999999999999555910790149937383830547332763671875,
            "max_sog": 0.200000000000000011102230246251565404236316680908203125
        }
    },
    "time_window": {
        "start": "2026-07-16T02:01:33+00:00",
        "end": "2026-07-16T02:31:53+00:00"
    },
    "points_count": {
        "vessel_a": 8,
        "vessel_b": 8
    },
    "zone_id": "discovered_001",
    "zone_name": "Strait of Gibraltar Surveillance Zone",
    "score": {
        "value": 72,
        "components": {
            "distance_tightness": {
                "score": 25,
                "max": 25,
                "detail": "Min distance 54m, avg 60m"
            },
            "duration": {
                "score": 5,
                "max": 25,
                "detail": "Duration 30 minutes"
            },
            "speed_stability": {
                "score": 17,
                "max": 20,
                "detail": "both nearly stationary; stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b15m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Strait of Gibraltar Surveillance Zone"
            }
        },
        "summary": "Moderate-confidence STS candidate. Two tankers (KUKDONG3HO and SUNGJIN ACE) maintained close proximity (min 54m, avg 60m) for 30 minutes. Both vessels were slow-moving (avg speeds 0.4 and 0.1 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Strait of Gibraltar Surveillance Zone, a known STS activity area."
    },
    "sar": {
        "status": "not_found",
        "centroid": {
            "lat": 35.02952959999999649198798579163849353790283203125,
            "lon": 129.07322149999998828207026235759258270263671875
        },
        "time_window": {
            "start_ts": "2026-07-16T02:01:33+00:00",
            "end_ts": "2026-07-16T02:31:53+00:00"
        },
        "searched_at": "2026-07-16T08:45:12.149112+00:00",
        "notes": "No Sentinel-1 scenes covering AOI and time window"
    }
}
Methodology: 2026.01.18
Sts🛰️✗ Strait of Gibraltar Surveillance Zone
Jul 16, 2026 02:00 UTC 80/100 ▼
Vessel A: IMO 9181352 (BUKWANG) REPUBLIC OF KOREA
Vessel B: MMSI 440156960 (SUNGJIN ACE) REPUBLIC OF KOREA
  • Minimum Distance: 48 meters
  • Average Distance: 54 meters
  • Duration: 51 minutes
  • Period: 2026-07-16T02:00:37+00:00 to 2026-07-16T02:51:48+00:00
  • Vessel A Avg Speed: 0.1 knots
  • Vessel B Avg Speed: 0.1 knots
  • Zone: Strait of Gibraltar Surveillance Zone

Confidence Analysis

Score: 80/100

High-confidence STS candidate. Two tankers (BUKWANG and SUNGJIN ACE) maintained close proximity (min 48m, avg 54m) for 51 minutes. Both vessels were slow-moving (avg speeds 0.1 and 0.1 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Strait of Gibraltar Surveillance Zone, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness25/25Min distance 48m, avg 54m
Duration10/25Duration 51 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±5m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Strait of Gibraltar Surveillance Zone

🛰️ Satellite Corroboration

✗ SAR Not Available

No satellite imagery for this time/location

No Sentinel-1 scenes covering AOI and time window

Searched: 2026-07-16T08:45:09.756229+00:00

Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 440191310,
        "imo": 9181352,
        "name": "BUKWANG",
        "flag": "REPUBLIC OF KOREA"
    },
    "vessel_b": {
        "mmsi": 440156960,
        "name": "SUNGJIN ACE",
        "flag": "REPUBLIC OF KOREA"
    },
    "min_distance_m": 47.60000000000000142108547152020037174224853515625,
    "avg_distance_m": 53.7999999999999971578290569595992565155029296875,
    "distance_consistency_m": 4.70000000000000017763568394002504646778106689453125,
    "duration_minutes": 51.2000000000000028421709430404007434844970703125,
    "overlap_duration_s": 3071,
    "speed_a_avg": 0.14000000000000001332267629550187848508358001708984375,
    "speed_a_std": 0.1499999999999999944488848768742172978818416595458984375,
    "speed_b_avg": 0.14000000000000001332267629550187848508358001708984375,
    "speed_b_std": 0.08000000000000000166533453693773481063544750213623046875,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.14000000000000001332267629550187848508358001708984375,
            "max_sog": 0.5
        },
        "vessel_b": {
            "avg_sog": 0.14000000000000001332267629550187848508358001708984375,
            "max_sog": 0.299999999999999988897769753748434595763683319091796875
        }
    },
    "time_window": {
        "start": "2026-07-16T02:00:37+00:00",
        "end": "2026-07-16T02:51:48+00:00"
    },
    "points_count": {
        "vessel_a": 16,
        "vessel_b": 16
    },
    "zone_id": "discovered_001",
    "zone_name": "Strait of Gibraltar Surveillance Zone",
    "score": {
        "value": 80,
        "components": {
            "distance_tightness": {
                "score": 25,
                "max": 25,
                "detail": "Min distance 48m, avg 54m"
            },
            "duration": {
                "score": 10,
                "max": 25,
                "detail": "Duration 51 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b15m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Strait of Gibraltar Surveillance Zone"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (BUKWANG and SUNGJIN ACE) maintained close proximity (min 48m, avg 54m) for 51 minutes. Both vessels were slow-moving (avg speeds 0.1 and 0.1 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Strait of Gibraltar Surveillance Zone, a known STS activity area."
    },
    "sar": {
        "status": "not_found",
        "centroid": {
            "lat": 35.02942879999999803430910105817019939422607421875,
            "lon": 129.07330719999998791536199860274791717529296875
        },
        "time_window": {
            "start_ts": "2026-07-16T02:00:37+00:00",
            "end_ts": "2026-07-16T02:51:48+00:00"
        },
        "searched_at": "2026-07-16T08:45:09.756229+00:00",
        "notes": "No Sentinel-1 scenes covering AOI and time window"
    }
}
Methodology: 2026.01.18
Zone Dwell Strait of Gibraltar Surveillance Zone
Jul 16, 2026 02:00 UTC 80.0% ▼
  • Zone: Strait of Gibraltar Surveillance Zone
  • Duration: 2h 7m
  • Data Points: 26 AIS positions
  • Period: 2026-07-16T02:00:08+00:00 to 2026-07-16T04:07:10+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_001",
    "zone_name": "Strait of Gibraltar Surveillance Zone",
    "dwell_minutes": 127,
    "points_in_zone": 26,
    "first_point": {
        "ts": "2026-07-16T02:00:08+00:00",
        "lat": 35.0294999999999987494447850622236728668212890625,
        "lon": 129.073499999999995679900166578590869903564453125
    },
    "last_point": {
        "ts": "2026-07-16T04:07:10+00:00",
        "lat": 35.02916669999999754736563772894442081451416015625,
        "lon": 129.073700000000002319211489520967006683349609375
    }
}
Methodology: 2026.01.18
Loiter Strait of Gibraltar Surveillance Zone
Jul 16, 2026 02:00 UTC 75.0% ▼
  • Duration: 2h 7m
  • Radius: 41 meters
  • Data Points: 26 AIS positions
  • Centroid: 35.0293, 129.0737
  • Zone: Strait of Gibraltar Surveillance Zone
Show Raw Evidence JSON
{
    "radius_m": 41.10000000000000142108547152020037174224853515625,
    "duration_minutes": 127,
    "points": 26,
    "centroid": {
        "lat": 35.02928410000000525315044797025620937347412109375,
        "lon": 129.07366551153842237908975221216678619384765625
    },
    "bbox": {
        "min_lat": 35.0289982999999978119376464746892452239990234375,
        "min_lon": 129.073399999999992360244505107402801513671875,
        "max_lat": 35.0295832999999987578121363185346126556396484375,
        "max_lon": 129.073883300000005647234502248466014862060546875
    },
    "zone_id": "discovered_001"
}
Methodology: 2026.01.18
Sts Strait of Gibraltar Surveillance Zone
Jul 16, 2026 01:22 UTC 79/100 ▼
Vessel A: MMSI 440156960 (SUNGJIN ACE) REPUBLIC OF KOREA
Vessel B: MMSI 440112380 (KUKDONG3HO) REPUBLIC OF KOREA
  • Minimum Distance: 55 meters
  • Average Distance: 66 meters
  • Duration: 1h 11m
  • Period: 2026-07-16T01:27:48+00:00 to 2026-07-16T02:39:29+00:00
  • Vessel A Avg Speed: 0.4 knots
  • Vessel B Avg Speed: 0.5 knots
  • Zone: Strait of Gibraltar Surveillance Zone

Confidence Analysis

Score: 79/100

Moderate-confidence STS candidate. Two tankers (SUNGJIN ACE and KUKDONG3HO) maintained close proximity (min 55m, avg 66m) for 72 minutes. Both vessels were slow-moving (avg speeds 0.4 and 0.5 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Strait of Gibraltar Surveillance Zone, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness25/25Min distance 55m, avg 66m
Duration15/25Duration 72 minutes
Speed Stability14/20both nearly stationary; somewhat variable speeds
Distance Consistency15/15Distance variance ±14m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Strait of Gibraltar Surveillance Zone
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 440156960,
        "name": "SUNGJIN ACE",
        "flag": "REPUBLIC OF KOREA"
    },
    "vessel_b": {
        "mmsi": 440112380,
        "name": "KUKDONG3HO",
        "flag": "REPUBLIC OF KOREA"
    },
    "min_distance_m": 55.10000000000000142108547152020037174224853515625,
    "avg_distance_m": 65.7000000000000028421709430404007434844970703125,
    "distance_consistency_m": 14.5,
    "duration_minutes": 71.7000000000000028421709430404007434844970703125,
    "overlap_duration_s": 4301,
    "speed_a_avg": 0.38000000000000000444089209850062616169452667236328125,
    "speed_a_std": 0.5300000000000000266453525910037569701671600341796875,
    "speed_b_avg": 0.4899999999999999911182158029987476766109466552734375,
    "speed_b_std": 0.479999999999999982236431605997495353221893310546875,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.38000000000000000444089209850062616169452667236328125,
            "max_sog": 1.899999999999999911182158029987476766109466552734375
        },
        "vessel_b": {
            "avg_sog": 0.4899999999999999911182158029987476766109466552734375,
            "max_sog": 1.5
        }
    },
    "time_window": {
        "start": "2026-07-16T01:27:48+00:00",
        "end": "2026-07-16T02:39:29+00:00"
    },
    "points_count": {
        "vessel_a": 18,
        "vessel_b": 18
    },
    "zone_id": "discovered_001",
    "zone_name": "Strait of Gibraltar Surveillance Zone",
    "score": {
        "value": 79,
        "components": {
            "distance_tightness": {
                "score": 25,
                "max": 25,
                "detail": "Min distance 55m, avg 66m"
            },
            "duration": {
                "score": 15,
                "max": 25,
                "detail": "Duration 72 minutes"
            },
            "speed_stability": {
                "score": 14,
                "max": 20,
                "detail": "both nearly stationary; somewhat variable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b114m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Strait of Gibraltar Surveillance Zone"
            }
        },
        "summary": "Moderate-confidence STS candidate. Two tankers (SUNGJIN ACE and KUKDONG3HO) maintained close proximity (min 55m, avg 66m) for 72 minutes. Both vessels were slow-moving (avg speeds 0.4 and 0.5 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Strait of Gibraltar Surveillance Zone, a known STS activity area."
    }
}
Methodology: 2026.01.18
Loiter Strait of Gibraltar Surveillance Zone
Jul 16, 2026 01:21 UTC 75.0% ▼
  • Duration: 2h 45m
  • Radius: 693 meters
  • Data Points: 37 AIS positions
  • Centroid: 35.0294, 129.0733
  • Zone: Strait of Gibraltar Surveillance Zone
Show Raw Evidence JSON
{
    "radius_m": 693.299999999999954525264911353588104248046875,
    "duration_minutes": 165.400000000000005684341886080801486968994140625,
    "points": 37,
    "centroid": {
        "lat": 35.0293522027026966725316015072166919708251953125,
        "lon": 129.07330941621620468140463344752788543701171875
    },
    "bbox": {
        "min_lat": 35.0289982999999978119376464746892452239990234375,
        "min_lon": 129.065766700000011724114301614463329315185546875,
        "max_lat": 35.03009829999999880101313465274870395660400390625,
        "max_lon": 129.073916700000012269811122678220272064208984375
    },
    "zone_id": "discovered_001"
}
Methodology: 2026.01.18
Zone Dwell Strait of Gibraltar Surveillance Zone
Jul 16, 2026 01:21 UTC 80.0% ▼
  • Zone: Strait of Gibraltar Surveillance Zone
  • Duration: 2h 45m
  • Data Points: 37 AIS positions
  • Period: 2026-07-16T01:21:48+00:00 to 2026-07-16T04:07:10+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_001",
    "zone_name": "Strait of Gibraltar Surveillance Zone",
    "dwell_minutes": 165.400000000000005684341886080801486968994140625,
    "points_in_zone": 37,
    "first_point": {
        "ts": "2026-07-16T01:21:48+00:00",
        "lat": 35.03009829999999880101313465274870395660400390625,
        "lon": 129.065766700000011724114301614463329315185546875
    },
    "last_point": {
        "ts": "2026-07-16T04:07:10+00:00",
        "lat": 35.02916669999999754736563772894442081451416015625,
        "lon": 129.073700000000002319211489520967006683349609375
    }
}
Methodology: 2026.01.18
Sts Strait of Gibraltar Surveillance Zone
Jul 16, 2026 01:18 UTC 82/100 ▼
Vessel A: MMSI 440156960 (SUNGJIN ACE) REPUBLIC OF KOREA
Vessel B: IMO 9181352 (BUKWANG) REPUBLIC OF KOREA
  • Minimum Distance: 38 meters
  • Average Distance: 54 meters
  • Duration: 1h 29m
  • Period: 2026-07-16T01:27:48+00:00 to 2026-07-16T02:57:10+00:00
  • Vessel A Avg Speed: 0.3 knots
  • Vessel B Avg Speed: 0.2 knots
  • Zone: Strait of Gibraltar Surveillance Zone

Confidence Analysis

Score: 82/100

High-confidence STS candidate. Two tankers (SUNGJIN ACE and BUKWANG) maintained close proximity (min 38m, avg 54m) for 89 minutes. Both vessels were slow-moving (avg speeds 0.3 and 0.2 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Strait of Gibraltar Surveillance Zone, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness25/25Min distance 38m, avg 54m
Duration15/25Duration 89 minutes
Speed Stability17/20both nearly stationary; stable speeds
Distance Consistency15/15Distance variance ±15m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Strait of Gibraltar Surveillance Zone
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 440156960,
        "name": "SUNGJIN ACE",
        "flag": "REPUBLIC OF KOREA"
    },
    "vessel_b": {
        "mmsi": 440191310,
        "imo": 9181352,
        "name": "BUKWANG",
        "flag": "REPUBLIC OF KOREA"
    },
    "min_distance_m": 38.2999999999999971578290569595992565155029296875,
    "avg_distance_m": 54.39999999999999857891452847979962825775146484375,
    "distance_consistency_m": 15,
    "duration_minutes": 89.400000000000005684341886080801486968994140625,
    "overlap_duration_s": 5362,
    "speed_a_avg": 0.330000000000000015543122344752191565930843353271484375,
    "speed_a_std": 0.4899999999999999911182158029987476766109466552734375,
    "speed_b_avg": 0.200000000000000011102230246251565404236316680908203125,
    "speed_b_std": 0.1700000000000000122124532708767219446599483489990234375,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.330000000000000015543122344752191565930843353271484375,
            "max_sog": 1.899999999999999911182158029987476766109466552734375
        },
        "vessel_b": {
            "avg_sog": 0.200000000000000011102230246251565404236316680908203125,
            "max_sog": 0.5
        }
    },
    "time_window": {
        "start": "2026-07-16T01:27:48+00:00",
        "end": "2026-07-16T02:57:10+00:00"
    },
    "points_count": {
        "vessel_a": 22,
        "vessel_b": 22
    },
    "zone_id": "discovered_001",
    "zone_name": "Strait of Gibraltar Surveillance Zone",
    "score": {
        "value": 82,
        "components": {
            "distance_tightness": {
                "score": 25,
                "max": 25,
                "detail": "Min distance 38m, avg 54m"
            },
            "duration": {
                "score": 15,
                "max": 25,
                "detail": "Duration 89 minutes"
            },
            "speed_stability": {
                "score": 17,
                "max": 20,
                "detail": "both nearly stationary; stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b115m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Strait of Gibraltar Surveillance Zone"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (SUNGJIN ACE and BUKWANG) maintained close proximity (min 38m, avg 54m) for 89 minutes. Both vessels were slow-moving (avg speeds 0.3 and 0.2 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Strait of Gibraltar Surveillance Zone, a known STS activity area."
    }
}
Methodology: 2026.01.18
Zone Dwell Strait of Gibraltar Surveillance Zone
Jul 16, 2026 00:02 UTC 80.0% ▼
  • Zone: Strait of Gibraltar Surveillance Zone
  • Duration: 4h 5m
  • Data Points: 42 AIS positions
  • Period: 2026-07-16T00:02:06+00:00 to 2026-07-16T04:07:10+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_001",
    "zone_name": "Strait of Gibraltar Surveillance Zone",
    "dwell_minutes": 245.099999999999994315658113919198513031005859375,
    "points_in_zone": 42,
    "first_point": {
        "ts": "2026-07-16T00:02:06+00:00",
        "lat": 35.01268329999999906476659816689789295196533203125,
        "lon": 129.06293329999999741630745120346546173095703125
    },
    "last_point": {
        "ts": "2026-07-16T04:07:10+00:00",
        "lat": 35.02916669999999754736563772894442081451416015625,
        "lon": 129.073700000000002319211489520967006683349609375
    }
}
Methodology: 2026.01.18
Zone Dwell Strait of Gibraltar Surveillance Zone
Jul 15, 2026 23:03 UTC 80.0% ▼
  • Zone: Strait of Gibraltar Surveillance Zone
  • Duration: 5h 3m
  • Data Points: 43 AIS positions
  • Period: 2026-07-15T23:03:26+00:00 to 2026-07-16T04:07:10+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_001",
    "zone_name": "Strait of Gibraltar Surveillance Zone",
    "dwell_minutes": 303.69999999999998863131622783839702606201171875,
    "points_in_zone": 43,
    "first_point": {
        "ts": "2026-07-15T23:03:26+00:00",
        "lat": 35.0081500000000005456968210637569427490234375,
        "lon": 129.065033300000010285657481290400028228759765625
    },
    "last_point": {
        "ts": "2026-07-16T04:07:10+00:00",
        "lat": 35.02916669999999754736563772894442081451416015625,
        "lon": 129.073700000000002319211489520967006683349609375
    }
}
Methodology: 2026.01.18
Zone Dwell Strait of Gibraltar Surveillance Zone
Jul 15, 2026 22:45 UTC 80.0% ▼
  • Zone: Strait of Gibraltar Surveillance Zone
  • Duration: 5h 21m
  • Data Points: 46 AIS positions
  • Period: 2026-07-15T22:45:47+00:00 to 2026-07-16T04:07:10+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_001",
    "zone_name": "Strait of Gibraltar Surveillance Zone",
    "dwell_minutes": 321.3999999999999772626324556767940521240234375,
    "points_in_zone": 46,
    "first_point": {
        "ts": "2026-07-15T22:45:47+00:00",
        "lat": 35.024816700000002356318873353302478790283203125,
        "lon": 129.057216699999997899794834665954113006591796875
    },
    "last_point": {
        "ts": "2026-07-16T04:07:10+00:00",
        "lat": 35.02916669999999754736563772894442081451416015625,
        "lon": 129.073700000000002319211489520967006683349609375
    }
}
Methodology: 2026.01.18

Recent Position Data

Time (UTC) Lat Lon Speed Course Zone
Jul 19 00:41 35.0289 129.0698 0.1 kn 83.1° Strait of Gibraltar Surveillance Zone
Jul 19 00:37 35.0289 129.0697 0.2 kn 33.1° Strait of Gibraltar Surveillance Zone
Jul 19 00:35 35.0289 129.0696 0.1 kn 39.2° Strait of Gibraltar Surveillance Zone
Jul 19 00:27 35.0289 129.0695 0.1 kn 111.1° Strait of Gibraltar Surveillance Zone
Jul 19 00:18 35.0288 129.0695 0.1 kn 325.8° Strait of Gibraltar Surveillance Zone
Jul 19 00:07 35.0287 129.0692 0.2 kn 45.6° Strait of Gibraltar Surveillance Zone
Jul 18 23:53 35.0282 129.0684 0.2 kn 296.7° Strait of Gibraltar Surveillance Zone
Jul 18 23:42 35.0280 129.0679 0.0 kn 65.8° Strait of Gibraltar Surveillance Zone
Jul 18 23:26 35.0282 129.0688 4.7 kn 136.0° Strait of Gibraltar Surveillance Zone
Jul 18 23:24 35.0280 129.0690 1.5 kn 98.3° Strait of Gibraltar Surveillance Zone
Jul 18 23:21 35.0283 129.0683 2.5 kn 135.2° Strait of Gibraltar Surveillance Zone
Jul 17 01:24 35.0276 129.0460 6.1 kn 332.4° Strait of Gibraltar Surveillance Zone
Jul 17 01:11 35.0120 129.0527 0.1 kn 36.1° Strait of Gibraltar Surveillance Zone
Jul 17 01:08 35.0121 129.0526 0.2 kn 140.2° Strait of Gibraltar Surveillance Zone
Jul 17 01:06 35.0123 129.0524 0.8 kn 130.4° Strait of Gibraltar Surveillance Zone
Jul 17 01:01 35.0128 129.0516 0.0 kn 311.2° Strait of Gibraltar Surveillance Zone
Jul 17 00:59 35.0127 129.0518 0.1 kn 302.2° Strait of Gibraltar Surveillance Zone
Jul 17 00:55 35.0125 129.0522 0.2 kn 288.2° Strait of Gibraltar Surveillance Zone
Jul 17 00:51 35.0125 129.0523 0.0 kn 52.3° Strait of Gibraltar Surveillance Zone
Jul 17 00:48 35.0125 129.0522 0.1 kn 84.3° Strait of Gibraltar Surveillance Zone

Showing 20 of 81 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.