CHASE OCEAN

IMO 9290660

Vessel information

Vessel Name CHASE OCEAN
IMO Number 9290660
MMSI 636024344
Vessel Type Tanker
Flag 🇱🇷 LIBERIA
Call Sign 5LSD7
Length 183 m
Beam 32 m

Detected Events (37)

Sts Cape Town Surveillance Zone
Nov 1, 2026 10:58 UTC 65/100 ▼
Vessel A: IMO 9514494 (ILITHA) SOUTH AFRICA
Vessel B: IMO 9290660 (CHASE OCEAN) LIBERIA
  • Minimum Distance: 486 meters
  • Average Distance: 489 meters
  • Duration: 1h 12m
  • Period: 2026-11-01T10:58:22+00:00 to 2026-11-01T12:10:35+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Cape Town Surveillance Zone

Confidence Analysis

Score: 65/100

Moderate-confidence STS candidate. Two tankers (ILITHA and CHASE OCEAN) maintained close proximity (min 486m, avg 489m) for 72 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Cape Town Surveillance Zone, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness5/25Min distance 486m, avg 489m
Duration15/25Duration 72 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±3m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Cape Town Surveillance Zone
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 601041620,
        "imo": 9514494,
        "name": "ILITHA",
        "flag": "SOUTH AFRICA"
    },
    "vessel_b": {
        "mmsi": 636024344,
        "imo": 9290660,
        "name": "CHASE OCEAN",
        "flag": "LIBERIA"
    },
    "min_distance_m": 485.8999999999999772626324556767940521240234375,
    "avg_distance_m": 489.30000000000001136868377216160297393798828125,
    "distance_consistency_m": 3.20000000000000017763568394002504646778106689453125,
    "duration_minutes": 72.2000000000000028421709430404007434844970703125,
    "overlap_duration_s": 4333,
    "speed_a_avg": 0,
    "speed_a_std": 0,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0,
            "max_sog": 0
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-11-01T10:58:22+00:00",
        "end": "2026-11-01T12:10:35+00:00"
    },
    "points_count": {
        "vessel_a": 9,
        "vessel_b": 9
    },
    "zone_id": "discovered_047",
    "zone_name": "Cape Town Surveillance Zone",
    "score": {
        "value": 65,
        "components": {
            "distance_tightness": {
                "score": 5,
                "max": 25,
                "detail": "Min distance 486m, avg 489m"
            },
            "duration": {
                "score": 15,
                "max": 25,
                "detail": "Duration 72 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b13m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Cape Town Surveillance Zone"
            }
        },
        "summary": "Moderate-confidence STS candidate. Two tankers (ILITHA and CHASE OCEAN) maintained close proximity (min 486m, avg 489m) for 72 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Cape Town Surveillance Zone, a known STS activity area."
    }
}
Methodology: 2026.01.18
Sts🛰️✗ Cape Town Surveillance Zone
Nov 1, 2026 09:01 UTC 75/100 ▼
Vessel A: IMO 9290660 (CHASE OCEAN) LIBERIA
Vessel B: IMO 9514494 (ILITHA) SOUTH AFRICA
  • Minimum Distance: 486 meters
  • Average Distance: 488 meters
  • Duration: 3 hours
  • Period: 2026-11-01T09:01:09+00:00 to 2026-11-01T12:01:09+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Cape Town Surveillance Zone

Confidence Analysis

Score: 75/100

Moderate-confidence STS candidate. Two tankers (CHASE OCEAN and ILITHA) maintained close proximity (min 486m, avg 488m) for 180 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Cape Town Surveillance Zone, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness5/25Min distance 486m, avg 488m
Duration25/25Duration 180 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±2m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Cape Town Surveillance Zone

🛰️ Satellite Corroboration

✗ SAR Not Available

No satellite imagery for this time/location

No Sentinel-1 scenes covering AOI and time window

Searched: 2026-11-01T15:30:07.137235+00:00

Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 636024344,
        "imo": 9290660,
        "name": "CHASE OCEAN",
        "flag": "LIBERIA"
    },
    "vessel_b": {
        "mmsi": 601041620,
        "imo": 9514494,
        "name": "ILITHA",
        "flag": "SOUTH AFRICA"
    },
    "min_distance_m": 485.80000000000001136868377216160297393798828125,
    "avg_distance_m": 488.3999999999999772626324556767940521240234375,
    "distance_consistency_m": 2.29999999999999982236431605997495353221893310546875,
    "duration_minutes": 180,
    "overlap_duration_s": 10800,
    "speed_a_avg": 0,
    "speed_a_std": 0,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0,
            "max_sog": 0
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-11-01T09:01:09+00:00",
        "end": "2026-11-01T12:01:09+00:00"
    },
    "points_count": {
        "vessel_a": 10,
        "vessel_b": 10
    },
    "zone_id": "discovered_047",
    "zone_name": "Cape Town Surveillance Zone",
    "score": {
        "value": 75,
        "components": {
            "distance_tightness": {
                "score": 5,
                "max": 25,
                "detail": "Min distance 486m, avg 488m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 180 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b12m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Cape Town Surveillance Zone"
            }
        },
        "summary": "Moderate-confidence STS candidate. Two tankers (CHASE OCEAN and ILITHA) maintained close proximity (min 486m, avg 488m) for 180 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Cape Town Surveillance Zone, a known STS activity area."
    },
    "sar": {
        "status": "not_found",
        "centroid": {
            "lat": -33.91308579999999750498318462632596492767333984375,
            "lon": 18.43941480000000154859662870876491069793701171875
        },
        "time_window": {
            "start_ts": "2026-11-01T09:01:09+00:00",
            "end_ts": "2026-11-01T12:01:09+00:00"
        },
        "searched_at": "2026-11-01T15:30:07.137235+00:00",
        "notes": "No Sentinel-1 scenes covering AOI and time window"
    }
}
Methodology: 2026.01.18
Zone Dwell Cape Town Surveillance Zone
Nov 1, 2026 09:01 UTC 80.0% ▼
  • Zone: Cape Town Surveillance Zone
  • Duration: 6h 24m
  • Data Points: 37 AIS positions
  • Period: 2026-11-01T09:22:09+00:00 to 2026-11-01T15:46:16+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_047",
    "zone_name": "Cape Town Surveillance Zone",
    "dwell_minutes": 384.1000000000000227373675443232059478759765625,
    "points_in_zone": 37,
    "first_point": {
        "ts": "2026-11-01T09:22:09+00:00",
        "lat": -33.9113550000000003592504072003066539764404296875,
        "lon": 18.4378099999999989222487783990800380706787109375
    },
    "last_point": {
        "ts": "2026-11-01T15:46:16+00:00",
        "lat": -34.12712169999999645142452209256589412689208984375,
        "lon": 18.112525000000001540456651127897202968597412109375
    }
}
Methodology: 2026.01.18
Loiter Cape Town Surveillance Zone
Nov 1, 2026 09:01 UTC 75.0% ▼
  • Duration: 3h 53m
  • Radius: 820 meters
  • Data Points: 12 AIS positions
  • Centroid: -33.9106, 18.4373
  • Zone: Cape Town Surveillance Zone
Show Raw Evidence JSON
{
    "radius_m": 820.1000000000000227373675443232059478759765625,
    "duration_minutes": 233.400000000000005684341886080801486968994140625,
    "points": 12,
    "centroid": {
        "lat": -33.9105848666666673807412735186517238616943359375,
        "lon": 18.437342916666665360025945119559764862060546875
    },
    "bbox": {
        "min_lat": -33.91136829999999946494426694698631763458251953125,
        "min_lon": 18.434116700000000577119863010011613368988037109375,
        "max_lat": -33.90327669999999926631062407977879047393798828125,
        "max_lon": 18.437821700000000646468834020197391510009765625
    },
    "zone_id": "discovered_047"
}
Methodology: 2026.01.18
Zone Dwell Cape Town Surveillance Zone
Nov 1, 2026 08:22 UTC 80.0% ▼
  • Zone: Cape Town Surveillance Zone
  • Duration: 6h 29m
  • Data Points: 38 AIS positions
  • Period: 2026-11-01T08:43:09+00:00 to 2026-11-01T15:12:16+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_047",
    "zone_name": "Cape Town Surveillance Zone",
    "dwell_minutes": 389.1000000000000227373675443232059478759765625,
    "points_in_zone": 38,
    "first_point": {
        "ts": "2026-11-01T08:43:09+00:00",
        "lat": -33.9113483000000002220986061729490756988525390625,
        "lon": 18.437798300000000750742401578463613986968994140625
    },
    "last_point": {
        "ts": "2026-11-01T15:12:16+00:00",
        "lat": -34.04679999999999751025825389660894870758056640625,
        "lon": 18.17148830000000003792592906393110752105712890625
    }
}
Methodology: 2026.01.18
Loiter Cape Town Surveillance Zone
Nov 1, 2026 08:22 UTC 75.0% ▼
  • Duration: 4h 32m
  • Radius: 846 meters
  • Data Points: 17 AIS positions
  • Centroid: -33.9108, 18.4375
  • Zone: Cape Town Surveillance Zone
Show Raw Evidence JSON
{
    "radius_m": 846.3999999999999772626324556767940521240234375,
    "duration_minutes": 272.3999999999999772626324556767940521240234375,
    "points": 17,
    "centroid": {
        "lat": -33.9108069647058840700992732308804988861083984375,
        "lon": 18.437479894117647205575849511660635471343994140625
    },
    "bbox": {
        "min_lat": -33.91136829999999946494426694698631763458251953125,
        "min_lon": 18.434116700000000577119863010011613368988037109375,
        "max_lat": -33.90327669999999926631062407977879047393798828125,
        "max_lon": 18.43782829999999961501089273951947689056396484375
    },
    "zone_id": "discovered_047"
}
Methodology: 2026.01.18
Sts Cape Town Surveillance Zone
Nov 1, 2026 08:16 UTC 75/100 ▼
Vessel A: IMO 9290660 (CHASE OCEAN) LIBERIA
Vessel B: IMO 9514494 (ILITHA) SOUTH AFRICA
  • Minimum Distance: 486 meters
  • Average Distance: 489 meters
  • Duration: 3h 3m
  • Period: 2026-11-01T08:58:09+00:00 to 2026-11-01T12:01:09+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Cape Town Surveillance Zone

Confidence Analysis

Score: 75/100

Moderate-confidence STS candidate. Two tankers (CHASE OCEAN and ILITHA) maintained close proximity (min 486m, avg 489m) for 183 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Cape Town Surveillance Zone, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness5/25Min distance 486m, avg 489m
Duration25/25Duration 183 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±2m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Cape Town Surveillance Zone
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 636024344,
        "imo": 9290660,
        "name": "CHASE OCEAN",
        "flag": "LIBERIA"
    },
    "vessel_b": {
        "mmsi": 601041620,
        "imo": 9514494,
        "name": "ILITHA",
        "flag": "SOUTH AFRICA"
    },
    "min_distance_m": 485.80000000000001136868377216160297393798828125,
    "avg_distance_m": 489,
    "distance_consistency_m": 2.399999999999999911182158029987476766109466552734375,
    "duration_minutes": 183,
    "overlap_duration_s": 10980,
    "speed_a_avg": 0,
    "speed_a_std": 0,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0,
            "max_sog": 0
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-11-01T08:58:09+00:00",
        "end": "2026-11-01T12:01:09+00:00"
    },
    "points_count": {
        "vessel_a": 11,
        "vessel_b": 11
    },
    "zone_id": "discovered_047",
    "zone_name": "Cape Town Surveillance Zone",
    "score": {
        "value": 75,
        "components": {
            "distance_tightness": {
                "score": 5,
                "max": 25,
                "detail": "Min distance 486m, avg 489m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 183 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b12m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Cape Town Surveillance Zone"
            }
        },
        "summary": "Moderate-confidence STS candidate. Two tankers (CHASE OCEAN and ILITHA) maintained close proximity (min 486m, avg 489m) for 183 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Cape Town Surveillance Zone, a known STS activity area."
    }
}
Methodology: 2026.01.18
Sts🛰️✗ Cape Town Surveillance Zone
Nov 1, 2026 07:13 UTC 70/100 ▼
Vessel A: IMO 9290660 (CHASE OCEAN) LIBERIA
Vessel B: IMO 9514494 (ILITHA) SOUTH AFRICA
  • Minimum Distance: 486 meters
  • Average Distance: 490 meters
  • Duration: 1h 30m
  • Period: 2026-11-01T07:13:09+00:00 to 2026-11-01T08:43:09+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Cape Town Surveillance Zone

Confidence Analysis

Score: 70/100

Moderate-confidence STS candidate. Two tankers (CHASE OCEAN and ILITHA) maintained close proximity (min 486m, avg 490m) for 90 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Cape Town Surveillance Zone, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness5/25Min distance 486m, avg 490m
Duration20/25Duration 90 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±4m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Cape Town Surveillance Zone

🛰️ Satellite Corroboration

✗ SAR Not Available

No satellite imagery for this time/location

No Sentinel-1 scenes covering AOI and time window

Searched: 2026-11-01T09:00:07.683666+00:00

Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 636024344,
        "imo": 9290660,
        "name": "CHASE OCEAN",
        "flag": "LIBERIA"
    },
    "vessel_b": {
        "mmsi": 601041620,
        "imo": 9514494,
        "name": "ILITHA",
        "flag": "SOUTH AFRICA"
    },
    "min_distance_m": 485.80000000000001136868377216160297393798828125,
    "avg_distance_m": 490.19999999999998863131622783839702606201171875,
    "distance_consistency_m": 4,
    "duration_minutes": 90,
    "overlap_duration_s": 5400,
    "speed_a_avg": 0,
    "speed_a_std": 0,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0,
            "max_sog": 0
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-11-01T07:13:09+00:00",
        "end": "2026-11-01T08:43:09+00:00"
    },
    "points_count": {
        "vessel_a": 9,
        "vessel_b": 9
    },
    "zone_id": "discovered_047",
    "zone_name": "Cape Town Surveillance Zone",
    "score": {
        "value": 70,
        "components": {
            "distance_tightness": {
                "score": 5,
                "max": 25,
                "detail": "Min distance 486m, avg 490m"
            },
            "duration": {
                "score": 20,
                "max": 25,
                "detail": "Duration 90 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b14m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Cape Town Surveillance Zone"
            }
        },
        "summary": "Moderate-confidence STS candidate. Two tankers (CHASE OCEAN and ILITHA) maintained close proximity (min 486m, avg 490m) for 90 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Cape Town Surveillance Zone, a known STS activity area."
    },
    "sar": {
        "status": "not_found",
        "centroid": {
            "lat": -33.91308860000000180434653884731233119964599609375,
            "lon": 18.4394273999999995794496499001979827880859375
        },
        "time_window": {
            "start_ts": "2026-11-01T07:13:09+00:00",
            "end_ts": "2026-11-01T08:43:09+00:00"
        },
        "searched_at": "2026-11-01T09:00:07.683666+00:00",
        "notes": "No Sentinel-1 scenes covering AOI and time window"
    }
}
Methodology: 2026.01.18
Zone Dwell Cape Town Surveillance Zone
Nov 1, 2026 07:01 UTC 80.0% ▼
  • Zone: Cape Town Surveillance Zone
  • Duration: 6h 29m
  • Data Points: 33 AIS positions
  • Period: 2026-11-01T07:37:09+00:00 to 2026-11-01T14:06:46+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_047",
    "zone_name": "Cape Town Surveillance Zone",
    "dwell_minutes": 389.6000000000000227373675443232059478759765625,
    "points_in_zone": 33,
    "first_point": {
        "ts": "2026-11-01T07:37:09+00:00",
        "lat": -33.9113483000000002220986061729490756988525390625,
        "lon": 18.437799999999999300825948012061417102813720703125
    },
    "last_point": {
        "ts": "2026-11-01T14:06:46+00:00",
        "lat": -33.8978733000000005404217517934739589691162109375,
        "lon": 18.286113300000000236877895076759159564971923828125
    }
}
Methodology: 2026.01.18
Loiter Cape Town Surveillance Zone
Nov 1, 2026 07:01 UTC 75.0% ▼
  • Duration: 5h 53m
  • Radius: 867 meters
  • Data Points: 25 AIS positions
  • Centroid: -33.9110, 18.4376
  • Zone: Cape Town Surveillance Zone
Show Raw Evidence JSON
{
    "radius_m": 866.8999999999999772626324556767940521240234375,
    "duration_minutes": 353.3999999999999772626324556767940521240234375,
    "points": 25,
    "centroid": {
        "lat": -33.9109792640000051733295549638569355010986328125,
        "lon": 18.437582795999997387070834520272910594940185546875
    },
    "bbox": {
        "min_lat": -33.91136829999999946494426694698631763458251953125,
        "min_lon": 18.434116700000000577119863010011613368988037109375,
        "max_lat": -33.90327669999999926631062407977879047393798828125,
        "max_lon": 18.43782829999999961501089273951947689056396484375
    },
    "zone_id": "discovered_047"
}
Methodology: 2026.01.18
Sts Mid-Atlantic Surveillance Zone
Nov 1, 2026 06:10 UTC 60/100 ▼
Vessel A: IMO 9290660 (CHASE OCEAN) LIBERIA
Vessel B: IMO 9514494 (ILITHA) SOUTH AFRICA
  • Minimum Distance: 478 meters
  • Average Distance: 484 meters
  • Duration: 48 minutes
  • Period: 2026-11-01T06:01:09+00:00 to 2026-11-01T06:49:09+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Mid-Atlantic Surveillance Zone

Confidence Analysis

Score: 60/100

Moderate-confidence STS candidate. Two tankers (CHASE OCEAN and ILITHA) maintained close proximity (min 478m, avg 484m) for 48 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Mid-Atlantic Surveillance Zone, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness5/25Min distance 478m, avg 484m
Duration10/25Duration 48 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±5m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Mid-Atlantic Surveillance Zone
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 636024344,
        "imo": 9290660,
        "name": "CHASE OCEAN",
        "flag": "LIBERIA"
    },
    "vessel_b": {
        "mmsi": 601041620,
        "imo": 9514494,
        "name": "ILITHA",
        "flag": "SOUTH AFRICA"
    },
    "min_distance_m": 478.3999999999999772626324556767940521240234375,
    "avg_distance_m": 483.8999999999999772626324556767940521240234375,
    "distance_consistency_m": 4.70000000000000017763568394002504646778106689453125,
    "duration_minutes": 48,
    "overlap_duration_s": 2880,
    "speed_a_avg": 0,
    "speed_a_std": 0,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0,
            "max_sog": 0
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-11-01T06:01:09+00:00",
        "end": "2026-11-01T06:49:09+00:00"
    },
    "points_count": {
        "vessel_a": 5,
        "vessel_b": 5
    },
    "zone_id": "discovered_048",
    "zone_name": "Mid-Atlantic Surveillance Zone",
    "score": {
        "value": 60,
        "components": {
            "distance_tightness": {
                "score": 5,
                "max": 25,
                "detail": "Min distance 478m, avg 484m"
            },
            "duration": {
                "score": 10,
                "max": 25,
                "detail": "Duration 48 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: Mid-Atlantic Surveillance Zone"
            }
        },
        "summary": "Moderate-confidence STS candidate. Two tankers (CHASE OCEAN and ILITHA) maintained close proximity (min 478m, avg 484m) for 48 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Mid-Atlantic Surveillance Zone, a known STS activity area."
    }
}
Methodology: 2026.01.18
Sts🛰️✗ Cape Town Surveillance Zone
Nov 1, 2026 06:01 UTC 70/100 ▼
Vessel A: IMO 9514494 (ILITHA) SOUTH AFRICA
Vessel B: IMO 9290660 (CHASE OCEAN) LIBERIA
  • Minimum Distance: 478 meters
  • Average Distance: 488 meters
  • Duration: 1h 36m
  • Period: 2026-11-01T06:10:21+00:00 to 2026-11-01T07:46:26+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Cape Town Surveillance Zone

Confidence Analysis

Score: 70/100

Moderate-confidence STS candidate. Two tankers (ILITHA and CHASE OCEAN) maintained close proximity (min 478m, avg 488m) for 96 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Cape Town Surveillance Zone, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness5/25Min distance 478m, avg 488m
Duration20/25Duration 96 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±4m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Cape Town Surveillance Zone

🛰️ Satellite Corroboration

✗ SAR Not Available

No satellite imagery for this time/location

No Sentinel-1 scenes covering AOI and time window

Searched: 2026-11-01T08:45:03.949935+00:00

Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 601041620,
        "imo": 9514494,
        "name": "ILITHA",
        "flag": "SOUTH AFRICA"
    },
    "vessel_b": {
        "mmsi": 636024344,
        "imo": 9290660,
        "name": "CHASE OCEAN",
        "flag": "LIBERIA"
    },
    "min_distance_m": 478.3999999999999772626324556767940521240234375,
    "avg_distance_m": 487.5,
    "distance_consistency_m": 4.5,
    "duration_minutes": 96.099999999999994315658113919198513031005859375,
    "overlap_duration_s": 5765,
    "speed_a_avg": 0,
    "speed_a_std": 0,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0,
            "max_sog": 0
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-11-01T06:10:21+00:00",
        "end": "2026-11-01T07:46:26+00:00"
    },
    "points_count": {
        "vessel_a": 7,
        "vessel_b": 7
    },
    "zone_id": "discovered_047",
    "zone_name": "Cape Town Surveillance Zone",
    "score": {
        "value": 70,
        "components": {
            "distance_tightness": {
                "score": 5,
                "max": 25,
                "detail": "Min distance 478m, avg 488m"
            },
            "duration": {
                "score": 20,
                "max": 25,
                "detail": "Duration 96 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b14m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Cape Town Surveillance Zone"
            }
        },
        "summary": "Moderate-confidence STS candidate. Two tankers (ILITHA and CHASE OCEAN) maintained close proximity (min 478m, avg 488m) for 96 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Cape Town Surveillance Zone, a known STS activity area."
    },
    "sar": {
        "status": "not_found",
        "centroid": {
            "lat": -33.91306800000000265526978182606399059295654296875,
            "lon": 18.439391799999999221881807898171246051788330078125
        },
        "time_window": {
            "start_ts": "2026-11-01T06:01:09+00:00",
            "end_ts": "2026-11-01T07:46:26+00:00"
        },
        "searched_at": "2026-11-01T08:45:03.949935+00:00",
        "notes": "No Sentinel-1 scenes covering AOI and time window"
    }
}
Methodology: 2026.01.18
Zone Dwell Cape Town Surveillance Zone
Nov 1, 2026 06:01 UTC 80.0% ▼
  • Zone: Cape Town Surveillance Zone
  • Duration: 6h 30m
  • Data Points: 34 AIS positions
  • Period: 2026-11-01T06:58:09+00:00 to 2026-11-01T13:28:17+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_047",
    "zone_name": "Cape Town Surveillance Zone",
    "dwell_minutes": 390.1000000000000227373675443232059478759765625,
    "points_in_zone": 34,
    "first_point": {
        "ts": "2026-11-01T06:58:09+00:00",
        "lat": -33.9113550000000003592504072003066539764404296875,
        "lon": 18.437813299999998406519807758741080760955810546875
    },
    "last_point": {
        "ts": "2026-11-01T13:28:17+00:00",
        "lat": -33.856431700000001683292794041335582733154296875,
        "lon": 18.389900000000000801492205937393009662628173828125
    }
}
Methodology: 2026.01.18
Loiter Cape Town Surveillance Zone
Nov 1, 2026 06:01 UTC 75.0% ▼
  • Duration: 6h 32m
  • Radius: 873 meters
  • Data Points: 29 AIS positions
  • Centroid: -33.9110, 18.4376
  • Zone: Cape Town Surveillance Zone
Show Raw Evidence JSON
{
    "radius_m": 872.8999999999999772626324556767940521240234375,
    "duration_minutes": 392.3999999999999772626324556767940521240234375,
    "points": 29,
    "centroid": {
        "lat": -33.91103022413792444922364666126668453216552734375,
        "lon": 18.43761102758620751274065696634352207183837890625
    },
    "bbox": {
        "min_lat": -33.91136829999999946494426694698631763458251953125,
        "min_lon": 18.434116700000000577119863010011613368988037109375,
        "max_lat": -33.90327669999999926631062407977879047393798828125,
        "max_lon": 18.43782829999999961501089273951947689056396484375
    },
    "zone_id": "discovered_047"
}
Methodology: 2026.01.18
Zone Dwell Cape Town Surveillance Zone
Nov 1, 2026 05:10 UTC 80.0% ▼
  • Zone: Cape Town Surveillance Zone
  • Duration: 6h 30m
  • Data Points: 31 AIS positions
  • Period: 2026-11-01T05:31:09+00:00 to 2026-11-01T12:01:09+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_047",
    "zone_name": "Cape Town Surveillance Zone",
    "dwell_minutes": 390,
    "points_in_zone": 31,
    "first_point": {
        "ts": "2026-11-01T05:31:09+00:00",
        "lat": -33.91132830000000097925294539891183376312255859375,
        "lon": 18.43778999999999967940311762504279613494873046875
    },
    "last_point": {
        "ts": "2026-11-01T12:01:09+00:00",
        "lat": -33.9113550000000003592504072003066539764404296875,
        "lon": 18.43779169999999822948666405864059925079345703125
    }
}
Methodology: 2026.01.18
Loiter Cape Town Surveillance Zone
Nov 1, 2026 05:10 UTC 75.0% ▼
  • Duration: 6h 30m
  • Radius: 4 meters
  • Data Points: 31 AIS positions
  • Centroid: -33.9113, 18.4378
  • Zone: Cape Town Surveillance Zone
Show Raw Evidence JSON
{
    "radius_m": 3.899999999999999911182158029987476766109466552734375,
    "duration_minutes": 390,
    "points": 31,
    "centroid": {
        "lat": -33.91134423870968106484724557958543300628662109375,
        "lon": 18.437799187096775455074748606421053409576416015625
    },
    "bbox": {
        "min_lat": -33.91136829999999946494426694698631763458251953125,
        "min_lon": 18.437768299999998333760231616906821727752685546875,
        "max_lat": -33.9113133000000033234755392186343669891357421875,
        "max_lon": 18.43782829999999961501089273951947689056396484375
    },
    "zone_id": "discovered_047"
}
Methodology: 2026.01.18
Sts🛰️✗ Cape Town Surveillance Zone
Nov 1, 2026 04:37 UTC 60/100 ▼
Vessel A: IMO 9290660 (CHASE OCEAN) LIBERIA
Vessel B: IMO 9514494 (ILITHA) SOUTH AFRICA
  • Minimum Distance: 491 meters
  • Average Distance: 493 meters
  • Duration: 54 minutes
  • Period: 2026-11-01T04:37:09+00:00 to 2026-11-01T05:31:09+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Cape Town Surveillance Zone

Confidence Analysis

Score: 60/100

Moderate-confidence STS candidate. Two tankers (CHASE OCEAN and ILITHA) maintained close proximity (min 491m, avg 492m) for 54 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Cape Town Surveillance Zone, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness5/25Min distance 491m, avg 492m
Duration10/25Duration 54 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±1m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Cape Town Surveillance Zone

🛰️ Satellite Corroboration

✗ SAR Not Available

No satellite imagery for this time/location

No Sentinel-1 scenes covering AOI and time window

Searched: 2026-11-01T11:00:01.504000+00:00

Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 636024344,
        "imo": 9290660,
        "name": "CHASE OCEAN",
        "flag": "LIBERIA"
    },
    "vessel_b": {
        "mmsi": 601041620,
        "imo": 9514494,
        "name": "ILITHA",
        "flag": "SOUTH AFRICA"
    },
    "min_distance_m": 491.19999999999998863131622783839702606201171875,
    "avg_distance_m": 492.5,
    "distance_consistency_m": 1.3000000000000000444089209850062616169452667236328125,
    "duration_minutes": 54,
    "overlap_duration_s": 3240,
    "speed_a_avg": 0,
    "speed_a_std": 0,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0,
            "max_sog": 0
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-11-01T04:37:09+00:00",
        "end": "2026-11-01T05:31:09+00:00"
    },
    "points_count": {
        "vessel_a": 4,
        "vessel_b": 4
    },
    "zone_id": "discovered_047",
    "zone_name": "Cape Town Surveillance Zone",
    "score": {
        "value": 60,
        "components": {
            "distance_tightness": {
                "score": 5,
                "max": 25,
                "detail": "Min distance 491m, avg 492m"
            },
            "duration": {
                "score": 10,
                "max": 25,
                "detail": "Duration 54 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b11m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Cape Town Surveillance Zone"
            }
        },
        "summary": "Moderate-confidence STS candidate. Two tankers (CHASE OCEAN and ILITHA) maintained close proximity (min 491m, avg 492m) for 54 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Cape Town Surveillance Zone, a known STS activity area."
    },
    "sar": {
        "status": "not_found",
        "centroid": {
            "lat": -33.913093099999997548366081900894641876220703125,
            "lon": 18.43940690000000159898263518698513507843017578125
        },
        "time_window": {
            "start_ts": "2026-11-01T04:37:09+00:00",
            "end_ts": "2026-11-01T05:31:09+00:00"
        },
        "searched_at": "2026-11-01T11:00:01.504000+00:00",
        "notes": "No Sentinel-1 scenes covering AOI and time window"
    }
}
Methodology: 2026.01.18
Zone Dwell Cape Town Surveillance Zone
Nov 1, 2026 04:10 UTC 80.0% ▼
  • Zone: Cape Town Surveillance Zone
  • Duration: 6h 36m
  • Data Points: 31 AIS positions
  • Period: 2026-11-01T04:43:09+00:00 to 2026-11-01T11:19:09+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_047",
    "zone_name": "Cape Town Surveillance Zone",
    "dwell_minutes": 396,
    "points_in_zone": 31,
    "first_point": {
        "ts": "2026-11-01T04:43:09+00:00",
        "lat": -33.9113382999999970479620969854295253753662109375,
        "lon": 18.43778329999999954225131659768521785736083984375
    },
    "last_point": {
        "ts": "2026-11-01T11:19:09+00:00",
        "lat": -33.91132830000000097925294539891183376312255859375,
        "lon": 18.43779500000000126647137221880257129669189453125
    }
}
Methodology: 2026.01.18
Loiter Cape Town Surveillance Zone
Nov 1, 2026 04:10 UTC 75.0% ▼
  • Duration: 6h 36m
  • Radius: 4 meters
  • Data Points: 31 AIS positions
  • Centroid: -33.9113, 18.4378
  • Zone: Cape Town Surveillance Zone
Show Raw Evidence JSON
{
    "radius_m": 3.899999999999999911182158029987476766109466552734375,
    "duration_minutes": 396,
    "points": 31,
    "centroid": {
        "lat": -33.9113435935483806815682328306138515472412109375,
        "lon": 18.43779783870967747816393966786563396453857421875
    },
    "bbox": {
        "min_lat": -33.91136829999999946494426694698631763458251953125,
        "min_lon": 18.437768299999998333760231616906821727752685546875,
        "max_lat": -33.9113133000000033234755392186343669891357421875,
        "max_lon": 18.43782829999999961501089273951947689056396484375
    },
    "zone_id": "discovered_047"
}
Methodology: 2026.01.18
Sts🛰️✗ Mid-Atlantic Surveillance Zone
Nov 1, 2026 03:04 UTC 75/100 ▼
Vessel A: IMO 9290660 (CHASE OCEAN) LIBERIA
Vessel B: IMO 9514494 (ILITHA) SOUTH AFRICA
  • Minimum Distance: 490 meters
  • Average Distance: 492 meters
  • Duration: 2h 27m
  • Period: 2026-11-01T03:04:09+00:00 to 2026-11-01T05:31:09+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Mid-Atlantic Surveillance Zone

Confidence Analysis

Score: 75/100

Moderate-confidence STS candidate. Two tankers (CHASE OCEAN and ILITHA) maintained close proximity (min 490m, avg 492m) for 147 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Mid-Atlantic Surveillance Zone, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness5/25Min distance 490m, avg 492m
Duration25/25Duration 147 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±2m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Mid-Atlantic Surveillance Zone

🛰️ Satellite Corroboration

✗ SAR Not Available

No satellite imagery for this time/location

No Sentinel-1 scenes covering AOI and time window

Searched: 2026-11-01T06:15:04.442575+00:00

Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 636024344,
        "imo": 9290660,
        "name": "CHASE OCEAN",
        "flag": "LIBERIA"
    },
    "vessel_b": {
        "mmsi": 601041620,
        "imo": 9514494,
        "name": "ILITHA",
        "flag": "SOUTH AFRICA"
    },
    "min_distance_m": 489.6000000000000227373675443232059478759765625,
    "avg_distance_m": 491.8999999999999772626324556767940521240234375,
    "distance_consistency_m": 1.8000000000000000444089209850062616169452667236328125,
    "duration_minutes": 147,
    "overlap_duration_s": 8820,
    "speed_a_avg": 0,
    "speed_a_std": 0,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0,
            "max_sog": 0
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-11-01T03:04:09+00:00",
        "end": "2026-11-01T05:31:09+00:00"
    },
    "points_count": {
        "vessel_a": 10,
        "vessel_b": 10
    },
    "zone_id": "discovered_048",
    "zone_name": "Mid-Atlantic Surveillance Zone",
    "score": {
        "value": 75,
        "components": {
            "distance_tightness": {
                "score": 5,
                "max": 25,
                "detail": "Min distance 490m, avg 492m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 147 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b12m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Mid-Atlantic Surveillance Zone"
            }
        },
        "summary": "Moderate-confidence STS candidate. Two tankers (CHASE OCEAN and ILITHA) maintained close proximity (min 490m, avg 492m) for 147 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Mid-Atlantic Surveillance Zone, a known STS activity area."
    },
    "sar": {
        "status": "not_found",
        "centroid": {
            "lat": -33.913101199999999835199560038745403289794921875,
            "lon": 18.439407700000000289719537249766290187835693359375
        },
        "time_window": {
            "start_ts": "2026-11-01T03:04:09+00:00",
            "end_ts": "2026-11-01T05:31:09+00:00"
        },
        "searched_at": "2026-11-01T06:15:04.442575+00:00",
        "notes": "No Sentinel-1 scenes covering AOI and time window"
    }
}
Methodology: 2026.01.18
Sts🛰️✗ Cape Town Surveillance Zone
Nov 1, 2026 03:04 UTC 75/100 ▼
Vessel A: IMO 9290660 (CHASE OCEAN) LIBERIA
Vessel B: IMO 9514494 (ILITHA) SOUTH AFRICA
  • Minimum Distance: 490 meters
  • Average Distance: 492 meters
  • Duration: 2h 27m
  • Period: 2026-11-01T03:04:09+00:00 to 2026-11-01T05:31:09+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Cape Town Surveillance Zone

Confidence Analysis

Score: 75/100

Moderate-confidence STS candidate. Two tankers (CHASE OCEAN and ILITHA) maintained close proximity (min 490m, avg 492m) for 147 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Cape Town Surveillance Zone, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness5/25Min distance 490m, avg 492m
Duration25/25Duration 147 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±2m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Cape Town Surveillance Zone

🛰️ Satellite Corroboration

✗ SAR Not Available

No satellite imagery for this time/location

No Sentinel-1 scenes covering AOI and time window

Searched: 2026-11-01T08:45:01.554998+00:00

Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 636024344,
        "imo": 9290660,
        "name": "CHASE OCEAN",
        "flag": "LIBERIA"
    },
    "vessel_b": {
        "mmsi": 601041620,
        "imo": 9514494,
        "name": "ILITHA",
        "flag": "SOUTH AFRICA"
    },
    "min_distance_m": 489.6000000000000227373675443232059478759765625,
    "avg_distance_m": 491.8999999999999772626324556767940521240234375,
    "distance_consistency_m": 1.8000000000000000444089209850062616169452667236328125,
    "duration_minutes": 147,
    "overlap_duration_s": 8820,
    "speed_a_avg": 0,
    "speed_a_std": 0,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0,
            "max_sog": 0
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-11-01T03:04:09+00:00",
        "end": "2026-11-01T05:31:09+00:00"
    },
    "points_count": {
        "vessel_a": 10,
        "vessel_b": 10
    },
    "zone_id": "discovered_047",
    "zone_name": "Cape Town Surveillance Zone",
    "score": {
        "value": 75,
        "components": {
            "distance_tightness": {
                "score": 5,
                "max": 25,
                "detail": "Min distance 490m, avg 492m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 147 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b12m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Cape Town Surveillance Zone"
            }
        },
        "summary": "Moderate-confidence STS candidate. Two tankers (CHASE OCEAN and ILITHA) maintained close proximity (min 490m, avg 492m) for 147 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Cape Town Surveillance Zone, a known STS activity area."
    },
    "sar": {
        "status": "not_found",
        "centroid": {
            "lat": -33.913101199999999835199560038745403289794921875,
            "lon": 18.439407700000000289719537249766290187835693359375
        },
        "time_window": {
            "start_ts": "2026-11-01T03:04:09+00:00",
            "end_ts": "2026-11-01T05:31:09+00:00"
        },
        "searched_at": "2026-11-01T08:45:01.554998+00:00",
        "notes": "No Sentinel-1 scenes covering AOI and time window"
    }
}
Methodology: 2026.01.18
Zone Dwell Cape Town Surveillance Zone
Nov 1, 2026 03:04 UTC 80.0% ▼
  • Zone: Cape Town Surveillance Zone
  • Duration: 6h 30m
  • Data Points: 32 AIS positions
  • Period: 2026-11-01T03:49:09+00:00 to 2026-11-01T10:19:09+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_047",
    "zone_name": "Cape Town Surveillance Zone",
    "dwell_minutes": 390,
    "points_in_zone": 32,
    "first_point": {
        "ts": "2026-11-01T03:49:09+00:00",
        "lat": -33.91133500000000111640474642626941204071044921875,
        "lon": 18.437763300000000299405655823647975921630859375
    },
    "last_point": {
        "ts": "2026-11-01T10:19:09+00:00",
        "lat": -33.91134170000000125355654745362699031829833984375,
        "lon": 18.437793299999999163674146984703838825225830078125
    }
}
Methodology: 2026.01.18
Loiter Cape Town Surveillance Zone
Nov 1, 2026 03:04 UTC 75.0% ▼
  • Duration: 6h 30m
  • Radius: 4 meters
  • Data Points: 32 AIS positions
  • Centroid: -33.9113, 18.4378
  • Zone: Cape Town Surveillance Zone
Show Raw Evidence JSON
{
    "radius_m": 3.79999999999999982236431605997495353221893310546875,
    "duration_minutes": 390,
    "points": 32,
    "centroid": {
        "lat": -33.9113436374999963618392939679324626922607421875,
        "lon": 18.437796446874994416020854259841144084930419921875
    },
    "bbox": {
        "min_lat": -33.91136829999999946494426694698631763458251953125,
        "min_lon": 18.437763300000000299405655823647975921630859375,
        "max_lat": -33.9113133000000033234755392186343669891357421875,
        "max_lon": 18.43782829999999961501089273951947689056396484375
    },
    "zone_id": "discovered_047"
}
Methodology: 2026.01.18
Sts Mid-Atlantic Surveillance Zone
Nov 1, 2026 02:55 UTC 70/100 ▼
Vessel A: IMO 9514494 (ILITHA) SOUTH AFRICA
Vessel B: IMO 9290660 (CHASE OCEAN) LIBERIA
  • Minimum Distance: 486 meters
  • Average Distance: 491 meters
  • Duration: 1h 39m
  • Period: 2026-11-01T02:55:28+00:00 to 2026-11-01T04:34:25+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Mid-Atlantic Surveillance Zone

Confidence Analysis

Score: 70/100

Moderate-confidence STS candidate. Two tankers (ILITHA and CHASE OCEAN) maintained close proximity (min 486m, avg 491m) for 99 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Mid-Atlantic Surveillance Zone, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness5/25Min distance 486m, avg 491m
Duration20/25Duration 99 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±3m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Mid-Atlantic Surveillance Zone
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 601041620,
        "imo": 9514494,
        "name": "ILITHA",
        "flag": "SOUTH AFRICA"
    },
    "vessel_b": {
        "mmsi": 636024344,
        "imo": 9290660,
        "name": "CHASE OCEAN",
        "flag": "LIBERIA"
    },
    "min_distance_m": 486.19999999999998863131622783839702606201171875,
    "avg_distance_m": 491.1000000000000227373675443232059478759765625,
    "distance_consistency_m": 2.899999999999999911182158029987476766109466552734375,
    "duration_minutes": 99,
    "overlap_duration_s": 5937,
    "speed_a_avg": 0,
    "speed_a_std": 0,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0,
            "max_sog": 0
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-11-01T02:55:28+00:00",
        "end": "2026-11-01T04:34:25+00:00"
    },
    "points_count": {
        "vessel_a": 12,
        "vessel_b": 12
    },
    "zone_id": "discovered_048",
    "zone_name": "Mid-Atlantic Surveillance Zone",
    "score": {
        "value": 70,
        "components": {
            "distance_tightness": {
                "score": 5,
                "max": 25,
                "detail": "Min distance 486m, avg 491m"
            },
            "duration": {
                "score": 20,
                "max": 25,
                "detail": "Duration 99 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b13m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Mid-Atlantic Surveillance Zone"
            }
        },
        "summary": "Moderate-confidence STS candidate. Two tankers (ILITHA and CHASE OCEAN) maintained close proximity (min 486m, avg 491m) for 99 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Mid-Atlantic Surveillance Zone, a known STS activity area."
    }
}
Methodology: 2026.01.18
Sts🛰️✗ Cape Town Surveillance Zone
Nov 1, 2026 02:55 UTC 70/100 ▼
Vessel A: IMO 9514494 (ILITHA) SOUTH AFRICA
Vessel B: IMO 9290660 (CHASE OCEAN) LIBERIA
  • Minimum Distance: 486 meters
  • Average Distance: 491 meters
  • Duration: 1h 39m
  • Period: 2026-11-01T02:55:28+00:00 to 2026-11-01T04:34:25+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Cape Town Surveillance Zone

Confidence Analysis

Score: 70/100

Moderate-confidence STS candidate. Two tankers (ILITHA and CHASE OCEAN) maintained close proximity (min 486m, avg 491m) for 99 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Cape Town Surveillance Zone, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness5/25Min distance 486m, avg 491m
Duration20/25Duration 99 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±3m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Cape Town Surveillance Zone

🛰️ Satellite Corroboration

✗ SAR Not Available

No satellite imagery for this time/location

No Sentinel-1 scenes covering AOI and time window

Searched: 2026-11-01T08:45:08.217394+00:00

Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 601041620,
        "imo": 9514494,
        "name": "ILITHA",
        "flag": "SOUTH AFRICA"
    },
    "vessel_b": {
        "mmsi": 636024344,
        "imo": 9290660,
        "name": "CHASE OCEAN",
        "flag": "LIBERIA"
    },
    "min_distance_m": 486.19999999999998863131622783839702606201171875,
    "avg_distance_m": 491.1000000000000227373675443232059478759765625,
    "distance_consistency_m": 2.899999999999999911182158029987476766109466552734375,
    "duration_minutes": 99,
    "overlap_duration_s": 5937,
    "speed_a_avg": 0,
    "speed_a_std": 0,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0,
            "max_sog": 0
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-11-01T02:55:28+00:00",
        "end": "2026-11-01T04:34:25+00:00"
    },
    "points_count": {
        "vessel_a": 12,
        "vessel_b": 12
    },
    "zone_id": "discovered_047",
    "zone_name": "Cape Town Surveillance Zone",
    "score": {
        "value": 70,
        "components": {
            "distance_tightness": {
                "score": 5,
                "max": 25,
                "detail": "Min distance 486m, avg 491m"
            },
            "duration": {
                "score": 20,
                "max": 25,
                "detail": "Duration 99 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b13m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Cape Town Surveillance Zone"
            }
        },
        "summary": "Moderate-confidence STS candidate. Two tankers (ILITHA and CHASE OCEAN) maintained close proximity (min 486m, avg 491m) for 99 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Cape Town Surveillance Zone, a known STS activity area."
    },
    "sar": {
        "status": "not_found",
        "centroid": {
            "lat": -33.91309729999999689198375563137233257293701171875,
            "lon": 18.43940539999999828069121576845645904541015625
        },
        "time_window": {
            "start_ts": "2026-11-01T02:55:28+00:00",
            "end_ts": "2026-11-01T04:34:25+00:00"
        },
        "searched_at": "2026-11-01T08:45:08.217394+00:00",
        "notes": "No Sentinel-1 scenes covering AOI and time window"
    }
}
Methodology: 2026.01.18
Zone Dwell Cape Town Surveillance Zone
Nov 1, 2026 02:04 UTC 80.0% ▼
  • Zone: Cape Town Surveillance Zone
  • Duration: 6h 24m
  • Data Points: 32 AIS positions
  • Period: 2026-11-01T02:37:09+00:00 to 2026-11-01T09:01:09+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_047",
    "zone_name": "Cape Town Surveillance Zone",
    "dwell_minutes": 384,
    "points_in_zone": 32,
    "first_point": {
        "ts": "2026-11-01T02:37:09+00:00",
        "lat": -33.911349999999998772182152606546878814697265625,
        "lon": 18.437786700000000195132088265381753444671630859375
    },
    "last_point": {
        "ts": "2026-11-01T09:01:09+00:00",
        "lat": -33.91134670000000284062480204738676548004150390625,
        "lon": 18.437808300000000372165231965482234954833984375
    }
}
Methodology: 2026.01.18
Loiter Cape Town Surveillance Zone
Nov 1, 2026 02:04 UTC 75.0% ▼
  • Duration: 6h 24m
  • Radius: 4 meters
  • Data Points: 32 AIS positions
  • Centroid: -33.9113, 18.4378
  • Zone: Cape Town Surveillance Zone
Show Raw Evidence JSON
{
    "radius_m": 3.600000000000000088817841970012523233890533447265625,
    "duration_minutes": 384,
    "points": 32,
    "centroid": {
        "lat": -33.9113448874999932058926788158714771270751953125,
        "lon": 18.43779515000000657209966448135673999786376953125
    },
    "bbox": {
        "min_lat": -33.91136829999999946494426694698631763458251953125,
        "min_lon": 18.437763300000000299405655823647975921630859375,
        "max_lat": -33.9113133000000033234755392186343669891357421875,
        "max_lon": 18.43782829999999961501089273951947689056396484375
    },
    "zone_id": "discovered_047"
}
Methodology: 2026.01.18
Sts🛰️✗ Cape Town Surveillance Zone
Nov 1, 2026 01:52 UTC 55/100 ▼
Vessel A: IMO 9290660 (CHASE OCEAN) LIBERIA
Vessel B: IMO 9514494 (ILITHA) SOUTH AFRICA
  • Minimum Distance: 486 meters
  • Average Distance: 492 meters
  • Duration: 30 minutes
  • Period: 2026-11-01T01:52:09+00:00 to 2026-11-01T02:22:09+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Cape Town Surveillance Zone

Confidence Analysis

Score: 55/100

Low-confidence STS candidate - may warrant review. Two tankers (CHASE OCEAN and ILITHA) maintained close proximity (min 486m, avg 492m) for 30 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Cape Town Surveillance Zone, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness5/25Min distance 486m, avg 492m
Duration5/25Duration 30 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±6m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Cape Town Surveillance Zone

🛰️ Satellite Corroboration

✗ SAR Not Available

No satellite imagery for this time/location

No Sentinel-1 scenes covering AOI and time window

Searched: 2026-11-01T08:30:13.932156+00:00

Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 636024344,
        "imo": 9290660,
        "name": "CHASE OCEAN",
        "flag": "LIBERIA"
    },
    "vessel_b": {
        "mmsi": 601041620,
        "imo": 9514494,
        "name": "ILITHA",
        "flag": "SOUTH AFRICA"
    },
    "min_distance_m": 485.8999999999999772626324556767940521240234375,
    "avg_distance_m": 492.3999999999999772626324556767940521240234375,
    "distance_consistency_m": 6.0999999999999996447286321199499070644378662109375,
    "duration_minutes": 30,
    "overlap_duration_s": 1800,
    "speed_a_avg": 0,
    "speed_a_std": 0,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0,
            "max_sog": 0
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-11-01T01:52:09+00:00",
        "end": "2026-11-01T02:22:09+00:00"
    },
    "points_count": {
        "vessel_a": 4,
        "vessel_b": 4
    },
    "zone_id": "discovered_047",
    "zone_name": "Cape Town Surveillance Zone",
    "score": {
        "value": 55,
        "components": {
            "distance_tightness": {
                "score": 5,
                "max": 25,
                "detail": "Min distance 486m, avg 492m"
            },
            "duration": {
                "score": 5,
                "max": 25,
                "detail": "Duration 30 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: Cape Town Surveillance Zone"
            }
        },
        "summary": "Low-confidence STS candidate - may warrant review. Two tankers (CHASE OCEAN and ILITHA) maintained close proximity (min 486m, avg 492m) for 30 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Cape Town Surveillance Zone, a known STS activity area."
    },
    "sar": {
        "status": "not_found",
        "centroid": {
            "lat": -33.913088299999998298517311923205852508544921875,
            "lon": 18.439411299999999727106114733032882213592529296875
        },
        "time_window": {
            "start_ts": "2026-11-01T01:52:09+00:00",
            "end_ts": "2026-11-01T02:22:09+00:00"
        },
        "searched_at": "2026-11-01T08:30:13.932156+00:00",
        "notes": "No Sentinel-1 scenes covering AOI and time window"
    }
}
Methodology: 2026.01.18
Zone Dwell Cape Town Surveillance Zone
Nov 1, 2026 01:37 UTC 80.0% ▼
  • Zone: Cape Town Surveillance Zone
  • Duration: 6h 30m
  • Data Points: 31 AIS positions
  • Period: 2026-11-01T01:52:09+00:00 to 2026-11-01T08:22:09+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_047",
    "zone_name": "Cape Town Surveillance Zone",
    "dwell_minutes": 390,
    "points_in_zone": 31,
    "first_point": {
        "ts": "2026-11-01T01:52:09+00:00",
        "lat": -33.9113167000000004236426320858299732208251953125,
        "lon": 18.437761699999999365218172897584736347198486328125
    },
    "last_point": {
        "ts": "2026-11-01T08:22:09+00:00",
        "lat": -33.91133500000000111640474642626941204071044921875,
        "lon": 18.43782829999999961501089273951947689056396484375
    }
}
Methodology: 2026.01.18
Loiter Cape Town Surveillance Zone
Nov 1, 2026 01:37 UTC 75.0% ▼
  • Duration: 6h 30m
  • Radius: 4 meters
  • Data Points: 31 AIS positions
  • Centroid: -33.9113, 18.4378
  • Zone: Cape Town Surveillance Zone
Show Raw Evidence JSON
{
    "radius_m": 4.0999999999999996447286321199499070644378662109375,
    "duration_minutes": 390,
    "points": 31,
    "centroid": {
        "lat": -33.91134402258063573754043318331241607666015625,
        "lon": 18.437791503225806621912852278910577297210693359375
    },
    "bbox": {
        "min_lat": -33.91136829999999946494426694698631763458251953125,
        "min_lon": 18.437761699999999365218172897584736347198486328125,
        "max_lat": -33.9113133000000033234755392186343669891357421875,
        "max_lon": 18.43782829999999961501089273951947689056396484375
    },
    "zone_id": "discovered_047"
}
Methodology: 2026.01.18
Sts🛰️✗ Mid-Atlantic Surveillance Zone
Nov 1, 2026 01:20 UTC 65/100 ▼
Vessel A: IMO 9290660 (CHASE OCEAN) LIBERIA
Vessel B: IMO 9514494 (ILITHA) SOUTH AFRICA
  • Minimum Distance: 486 meters
  • Average Distance: 492 meters
  • Duration: 1h 2m
  • Period: 2026-11-01T01:20:06+00:00 to 2026-11-01T02:22:09+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Mid-Atlantic Surveillance Zone

Confidence Analysis

Score: 65/100

Moderate-confidence STS candidate. Two tankers (CHASE OCEAN and ILITHA) maintained close proximity (min 486m, avg 492m) for 62 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Mid-Atlantic Surveillance Zone, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness5/25Min distance 486m, avg 492m
Duration15/25Duration 62 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±4m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Mid-Atlantic Surveillance Zone

🛰️ Satellite Corroboration

✗ SAR Not Available

No satellite imagery for this time/location

No Sentinel-1 scenes covering AOI and time window

Searched: 2026-11-01T07:45:01.344581+00:00

Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 636024344,
        "imo": 9290660,
        "name": "CHASE OCEAN",
        "flag": "LIBERIA"
    },
    "vessel_b": {
        "mmsi": 601041620,
        "imo": 9514494,
        "name": "ILITHA",
        "flag": "SOUTH AFRICA"
    },
    "min_distance_m": 485.8999999999999772626324556767940521240234375,
    "avg_distance_m": 492.19999999999998863131622783839702606201171875,
    "distance_consistency_m": 3.79999999999999982236431605997495353221893310546875,
    "duration_minutes": 62,
    "overlap_duration_s": 3723,
    "speed_a_avg": 0,
    "speed_a_std": 0,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0,
            "max_sog": 0
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-11-01T01:20:06+00:00",
        "end": "2026-11-01T02:22:09+00:00"
    },
    "points_count": {
        "vessel_a": 9,
        "vessel_b": 9
    },
    "zone_id": "discovered_048",
    "zone_name": "Mid-Atlantic Surveillance Zone",
    "score": {
        "value": 65,
        "components": {
            "distance_tightness": {
                "score": 5,
                "max": 25,
                "detail": "Min distance 486m, avg 492m"
            },
            "duration": {
                "score": 15,
                "max": 25,
                "detail": "Duration 62 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b14m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Mid-Atlantic Surveillance Zone"
            }
        },
        "summary": "Moderate-confidence STS candidate. Two tankers (CHASE OCEAN and ILITHA) maintained close proximity (min 486m, avg 492m) for 62 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Mid-Atlantic Surveillance Zone, a known STS activity area."
    },
    "sar": {
        "status": "not_found",
        "centroid": {
            "lat": -33.91309559999999834190020919777452945709228515625,
            "lon": 18.439411299999999727106114733032882213592529296875
        },
        "time_window": {
            "start_ts": "2026-11-01T01:20:06+00:00",
            "end_ts": "2026-11-01T02:22:09+00:00"
        },
        "searched_at": "2026-11-01T07:45:01.344581+00:00",
        "notes": "No Sentinel-1 scenes covering AOI and time window"
    }
}
Methodology: 2026.01.18
Zone Dwell Mid-Atlantic Surveillance Zone
Nov 1, 2026 01:02 UTC 80.0% ▼
  • Zone: Mid-Atlantic Surveillance Zone
  • Duration: 6h 34m
  • Data Points: 37 AIS positions
  • Period: 2026-11-01T01:02:47+00:00 to 2026-11-01T07:37:09+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_048",
    "zone_name": "Mid-Atlantic Surveillance Zone",
    "dwell_minutes": 394.3999999999999772626324556767940521240234375,
    "points_in_zone": 37,
    "first_point": {
        "ts": "2026-11-01T01:02:47+00:00",
        "lat": -33.9113516999999973222656990401446819305419921875,
        "lon": 18.43779669999999981655491865240037441253662109375
    },
    "last_point": {
        "ts": "2026-11-01T07:37:09+00:00",
        "lat": -33.9113483000000002220986061729490756988525390625,
        "lon": 18.437799999999999300825948012061417102813720703125
    }
}
Methodology: 2026.01.18
Loiter Mid-Atlantic Surveillance Zone
Nov 1, 2026 01:02 UTC 75.0% ▼
  • Duration: 6h 34m
  • Radius: 4 meters
  • Data Points: 37 AIS positions
  • Centroid: -33.9113, 18.4378
  • Zone: Mid-Atlantic Surveillance Zone
Show Raw Evidence JSON
{
    "radius_m": 4.0999999999999996447286321199499070644378662109375,
    "duration_minutes": 394.3999999999999772626324556767940521240234375,
    "points": 37,
    "centroid": {
        "lat": -33.91134485675676302207648404873907566070556640625,
        "lon": 18.437789597297307153667134116403758525848388671875
    },
    "bbox": {
        "min_lat": -33.91136829999999946494426694698631763458251953125,
        "min_lon": 18.437761699999999365218172897584736347198486328125,
        "max_lat": -33.9113133000000033234755392186343669891357421875,
        "max_lon": 18.437813299999998406519807758741080760955810546875
    },
    "zone_id": "discovered_048"
}
Methodology: 2026.01.18
Sts Mid-Atlantic Surveillance Zone
Nov 1, 2026 00:55 UTC 65/100 ▼
Vessel A: IMO 9514494 (ILITHA) SOUTH AFRICA
Vessel B: IMO 9290660 (CHASE OCEAN) LIBERIA
  • Minimum Distance: 486 meters
  • Average Distance: 492 meters
  • Duration: 1h 27m
  • Period: 2026-11-01T00:55:28+00:00 to 2026-11-01T02:22:35+00:00
  • Vessel A Avg Speed: 0.0 knots
  • Vessel B Avg Speed: 0.0 knots
  • Zone: Mid-Atlantic Surveillance Zone

Confidence Analysis

Score: 65/100

Moderate-confidence STS candidate. Two tankers (ILITHA and CHASE OCEAN) maintained close proximity (min 486m, avg 492m) for 87 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Mid-Atlantic Surveillance Zone, a known STS activity area.

View scoring breakdown
FactorScoreDetail
Distance Tightness5/25Min distance 486m, avg 492m
Duration15/25Duration 87 minutes
Speed Stability20/20both nearly stationary; very stable speeds
Distance Consistency15/15Distance variance ±4m
Isolation5/10Isolation data not available
Context5/5In monitored zone: Mid-Atlantic Surveillance Zone
Show Raw Evidence JSON
{
    "vessel_a": {
        "mmsi": 601041620,
        "imo": 9514494,
        "name": "ILITHA",
        "flag": "SOUTH AFRICA"
    },
    "vessel_b": {
        "mmsi": 636024344,
        "imo": 9290660,
        "name": "CHASE OCEAN",
        "flag": "LIBERIA"
    },
    "min_distance_m": 485.8999999999999772626324556767940521240234375,
    "avg_distance_m": 492,
    "distance_consistency_m": 4.4000000000000003552713678800500929355621337890625,
    "duration_minutes": 87.099999999999994315658113919198513031005859375,
    "overlap_duration_s": 5227,
    "speed_a_avg": 0,
    "speed_a_std": 0,
    "speed_b_avg": 0.040000000000000000832667268468867405317723751068115234375,
    "speed_b_std": 0.11000000000000000055511151231257827021181583404541015625,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0,
            "max_sog": 0
        },
        "vessel_b": {
            "avg_sog": 0.040000000000000000832667268468867405317723751068115234375,
            "max_sog": 0.299999999999999988897769753748434595763683319091796875
        }
    },
    "time_window": {
        "start": "2026-11-01T00:55:28+00:00",
        "end": "2026-11-01T02:22:35+00:00"
    },
    "points_count": {
        "vessel_a": 8,
        "vessel_b": 8
    },
    "zone_id": "discovered_048",
    "zone_name": "Mid-Atlantic Surveillance Zone",
    "score": {
        "value": 65,
        "components": {
            "distance_tightness": {
                "score": 5,
                "max": 25,
                "detail": "Min distance 486m, avg 492m"
            },
            "duration": {
                "score": 15,
                "max": 25,
                "detail": "Duration 87 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b14m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Mid-Atlantic Surveillance Zone"
            }
        },
        "summary": "Moderate-confidence STS candidate. Two tankers (ILITHA and CHASE OCEAN) maintained close proximity (min 486m, avg 492m) for 87 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Mid-Atlantic Surveillance Zone, a known STS activity area."
    }
}
Methodology: 2026.01.18
Loiter Mid-Atlantic Surveillance Zone
Nov 1, 2026 00:32 UTC 75.0% ▼
  • Duration: 6h 35m
  • Radius: 18 meters
  • Data Points: 38 AIS positions
  • Centroid: -33.9113, 18.4378
  • Zone: Mid-Atlantic Surveillance Zone
Show Raw Evidence JSON
{
    "radius_m": 17.89999999999999857891452847979962825775146484375,
    "duration_minutes": 395.69999999999998863131622783839702606201171875,
    "points": 38,
    "centroid": {
        "lat": -33.91134854736842640932081849314272403717041015625,
        "lon": 18.437786010526320268354538711719214916229248046875
    },
    "bbox": {
        "min_lat": -33.91147670000000147183527587912976741790771484375,
        "min_lon": 18.4376682999999985668182489462196826934814453125,
        "max_lat": -33.9113133000000033234755392186343669891357421875,
        "max_lon": 18.437813299999998406519807758741080760955810546875
    },
    "zone_id": "discovered_048"
}
Methodology: 2026.01.18
Zone Dwell Mid-Atlantic Surveillance Zone
Nov 1, 2026 00:02 UTC 80.0% ▼
  • Zone: Mid-Atlantic Surveillance Zone
  • Duration: 6h 35m
  • Data Points: 38 AIS positions
  • Period: 2026-11-01T00:52:27+00:00 to 2026-11-01T07:28:09+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_048",
    "zone_name": "Mid-Atlantic Surveillance Zone",
    "dwell_minutes": 395.69999999999998863131622783839702606201171875,
    "points_in_zone": 38,
    "first_point": {
        "ts": "2026-11-01T00:52:27+00:00",
        "lat": -33.91147670000000147183527587912976741790771484375,
        "lon": 18.4376682999999985668182489462196826934814453125
    },
    "last_point": {
        "ts": "2026-11-01T07:28:09+00:00",
        "lat": -33.9113483000000002220986061729490756988525390625,
        "lon": 18.437786700000000195132088265381753444671630859375
    }
}
Methodology: 2026.01.18
Zone Dwell Mid-Atlantic Surveillance Zone
Oct 31, 2026 23:24 UTC 80.0% ▼
  • Zone: Mid-Atlantic Surveillance Zone
  • Duration: 6h 30m
  • Data Points: 42 AIS positions
  • Period: 2026-10-31T23:51:26+00:00 to 2026-11-01T06:22:09+00:00
Show Raw Evidence JSON
{
    "zone_id": "discovered_048",
    "zone_name": "Mid-Atlantic Surveillance Zone",
    "dwell_minutes": 390.69999999999998863131622783839702606201171875,
    "points_in_zone": 42,
    "first_point": {
        "ts": "2026-10-31T23:51:26+00:00",
        "lat": -33.871426700000000664658728055655956268310546875,
        "lon": 18.401038299999999736655809101648628711700439453125
    },
    "last_point": {
        "ts": "2026-11-01T06:22:09+00:00",
        "lat": -33.91132830000000097925294539891183376312255859375,
        "lon": 18.43778999999999967940311762504279613494873046875
    }
}
Methodology: 2026.01.18

Recent Position Data

Time (UTC) Lat Lon Speed Course Zone
Nov 1 16:06 -34.1761 18.0817 9.5 kn 208.5° Cape Peninsula Monitoring Zone
Nov 1 15:53 -34.1447 18.1011 9.6 kn 208.7° Cape Peninsula Monitoring Zone
Nov 1 15:46 -34.1271 18.1125 9.8 kn 209.9° Mid-Atlantic Surveillance Zone
Nov 1 15:43 -34.1201 18.1173 9.6 kn 210.3° Mid-Atlantic Surveillance Zone
Nov 1 15:42 -34.1177 18.1190 9.6 kn 212.9° Mid-Atlantic Surveillance Zone
Nov 1 15:12 -34.0468 18.1715 9.9 kn 214.4° Mid-Atlantic Surveillance Zone
Nov 1 14:49 -33.9958 18.2109 9.7 kn 215.7° Mid-Atlantic Surveillance Zone
Nov 1 14:42 -33.9796 18.2235 9.3 kn 212.6° Mid-Atlantic Surveillance Zone
Nov 1 14:25 -33.9409 18.2533 9.7 kn 214.6° Mid-Atlantic Surveillance Zone
Nov 1 14:20 -33.9291 18.2624 9.7 kn 211.5° Mid-Atlantic Surveillance Zone
Nov 1 14:15 -33.9171 18.2715 9.8 kn 212.3° Mid-Atlantic Surveillance Zone
Nov 1 14:13 -33.9125 18.2750 9.5 kn 213.8° Mid-Atlantic Surveillance Zone
Nov 1 14:12 -33.9103 18.2768 9.6 kn 212.9° Mid-Atlantic Surveillance Zone
Nov 1 14:06 -33.8979 18.2861 9.3 kn 212.2° Mid-Atlantic Surveillance Zone
Nov 1 14:04 -33.8927 18.2899 9.3 kn 212.3° Mid-Atlantic Surveillance Zone
Nov 1 13:48 -33.8660 18.3272 9.9 kn 243.9° Mid-Atlantic Surveillance Zone
Nov 1 13:46 -33.8633 18.3335 9.6 kn 244.7° Mid-Atlantic Surveillance Zone
Nov 1 13:45 -33.8622 18.3364 9.4 kn 244.1° Mid-Atlantic Surveillance Zone
Nov 1 13:44 -33.8610 18.3392 9.2 kn 245.4° Mid-Atlantic Surveillance Zone
Nov 1 13:34 -33.8564 18.3691 9.8 kn 269.6° Mid-Atlantic Surveillance Zone

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.