{
  "schema": "SOVRIENT_MARITIME_AIS_OBSERVATION_GAP_REVIEW_V1",
  "generated_utc": "2026-04-08T16:53:27Z",
  "lane_id": "maritime_ais_hampton_roads",
  "slice_id": "ais_hampton_roads_2025-09-15_bbox",
  "event_class": "observation_gap_review",
  "review_policy": {
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    "min_gap_sec": 3600,
    "min_observations_per_mmsi": 20,
    "candidate_limit": 25,
    "internal_gap_only": true,
    "ordering_rule": "gap_sec_desc_then_mmsi_then_gap_start_then_gap_end"
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  "source_binding": {
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    "clipped_csv": "./maritime_ais_hampton_roads_2025-09-15_bbox.csv.gz",
    "clipped_csv_sha256": "bca5e4f4eff96daa3a46cc827576363d411fe17beda0942dc20a5af7df42dd0b"
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    "qualifying_mmsi_count": 41,
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      "transceiver": "B",
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      "review_state": "manual_review_required",
      "review_reason": "gap_duration_ge_threshold",
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      "gap_end_utc": "2025-09-15T16:26:07Z",
      "gap_sec": 10254,
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        "timestamp_utc": "2025-09-15T13:35:13Z",
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        "cog": 200.6,
        "heading": null,
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      },
      "following_observation": {
        "timestamp_utc": "2025-09-15T16:26:07Z",
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      }
    },
    {
      "candidate_id": "obs-gap-0020",
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      "gap_end_utc": "2025-09-15T15:39:08Z",
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        "status": 0.0
      }
    },
    {
      "candidate_id": "obs-gap-0021",
      "mmsi": "366845210",
      "vessel_name": "CAPE HENRY EXPRESS",
      "imo": null,
      "call_sign": "WDN4723",
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      "review_reason": "gap_duration_ge_threshold",
      "gap_start_utc": "2025-09-15T16:43:55Z",
      "gap_end_utc": "2025-09-15T19:03:35Z",
      "gap_sec": 8380,
      "preceding_observation": {
        "timestamp_utc": "2025-09-15T16:43:55Z",
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        "cog": 21.7,
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      "following_observation": {
        "timestamp_utc": "2025-09-15T19:03:35Z",
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        "cog": 331.2,
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      }
    },
    {
      "candidate_id": "obs-gap-0022",
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        "latitude": 37.02459,
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      },
      "following_observation": {
        "timestamp_utc": "2025-09-15T16:43:53Z",
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        "latitude": 37.0246,
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      }
    },
    {
      "candidate_id": "obs-gap-0023",
      "mmsi": "338153665",
      "vessel_name": "MY SUNSHINE",
      "imo": null,
      "call_sign": "MY SUN",
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      "mmsi_observation_count": 50,
      "candidate_kind": "internal_observation_gap",
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      "review_reason": "gap_duration_ge_threshold",
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      "gap_end_utc": "2025-09-15T16:08:05Z",
      "gap_sec": 7920,
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        "timestamp_utc": "2025-09-15T13:56:05Z",
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      },
      "following_observation": {
        "timestamp_utc": "2025-09-15T16:08:05Z",
        "longitude": -76.2973,
        "latitude": 36.841,
        "sog": 0.0,
        "cog": null,
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        "status": null
      }
    },
    {
      "candidate_id": "obs-gap-0024",
      "mmsi": "368334950",
      "vessel_name": "CINNAMON GIRL",
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      "call_sign": "WDP2287",
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      "mmsi_observation_count": 118,
      "candidate_kind": "internal_observation_gap",
      "review_state": "manual_review_required",
      "review_reason": "gap_duration_ge_threshold",
      "gap_start_utc": "2025-09-15T00:01:14Z",
      "gap_end_utc": "2025-09-15T02:04:17Z",
      "gap_sec": 7383,
      "preceding_observation": {
        "timestamp_utc": "2025-09-15T00:01:14Z",
        "longitude": -76.01868,
        "latitude": 37.26449,
        "sog": 0.2,
        "cog": null,
        "heading": null,
        "status": null
      },
      "following_observation": {
        "timestamp_utc": "2025-09-15T02:04:17Z",
        "longitude": -76.01874,
        "latitude": 37.26449,
        "sog": 0.1,
        "cog": null,
        "heading": null,
        "status": null
      }
    },
    {
      "candidate_id": "obs-gap-0025",
      "mmsi": "368422660",
      "vessel_name": "CHASING SERENITY",
      "imo": null,
      "call_sign": "WDQ4121",
      "transceiver": "B",
      "vessel_type": 36.0,
      "mmsi_observation_count": 44,
      "candidate_kind": "internal_observation_gap",
      "review_state": "manual_review_required",
      "review_reason": "gap_duration_ge_threshold",
      "gap_start_utc": "2025-09-15T15:40:39Z",
      "gap_end_utc": "2025-09-15T17:43:39Z",
      "gap_sec": 7380,
      "preceding_observation": {
        "timestamp_utc": "2025-09-15T15:40:39Z",
        "longitude": -76.30084,
        "latitude": 36.84427,
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        "cog": null,
        "heading": null,
        "status": null
      },
      "following_observation": {
        "timestamp_utc": "2025-09-15T17:43:39Z",
        "longitude": -76.30079,
        "latitude": 36.84425,
        "sog": 0.0,
        "cog": null,
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        "status": null
      }
    }
  ],
  "what_this_does_not_prove": [
    "that a reviewed gap proves AIS blackout at the vessel",
    "that a reviewed gap proves spoofing or malicious behavior",
    "that a reviewed gap proves the vessel was absent from the area",
    "that a reviewed gap by itself constitutes an incident finding"
  ]
}