{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://raw.githubusercontent.com/api-evangelist/marine-traffic/main/json-schema/marine-traffic-voyage-forecast-schema.json",
  "title": "MarineTraffic Voyage Forecast",
  "description": "Machine-learning–derived voyage forecast for a vessel — destination prediction, ETA, route, and probability — as returned by VI01 / VI04 / VI07.",
  "type": "object",
  "properties": {
    "MMSI": {"type":["string","integer"],"description":"Vessel MMSI."},
    "IMO": {"type":["string","integer","null"],"description":"Vessel IMO."},
    "SHIP_ID": {"type":["string","integer"],"description":"MarineTraffic internal vessel ID."},
    "PREDICTED_DESTINATION_PORT": {
      "type":["string","null"],
      "description":"Predicted destination port name."
    },
    "PREDICTED_DESTINATION_UNLOCODE": {
      "type":["string","null"],
      "description":"UN/LOCODE of the predicted destination port."
    },
    "PREDICTED_DESTINATION_PROBABILITY": {
      "type":["number","string","null"],
      "description":"Probability score (0.0–1.0) for the destination prediction."
    },
    "PREDICTED_ETA_UTC": {
      "type":["string","null"],
      "format":"date-time",
      "description":"Predictive ETA in UTC."
    },
    "AIS_DESTINATION": {
      "type":["string","null"],
      "description":"AIS-broadcast destination (raw text)."
    },
    "AIS_ETA_UTC": {
      "type":["string","null"],
      "format":"date-time",
      "description":"AIS-broadcast ETA in UTC."
    },
    "SPEED_AVG_KN": {
      "type":["number","string","null"],
      "description":"Average speed used in the ETA calculation, in knots."
    },
    "ROUTE_DISTANCE_NM": {
      "type":["number","string","null"],
      "description":"Predicted route distance to destination, in nautical miles."
    },
    "DESTINATION_AREAS": {
      "type":["array","null"],
      "items":{
        "type":"object",
        "properties":{
          "PORT_ID":{"type":["string","integer"]},
          "PORT_NAME":{"type":"string"},
          "UNLOCODE":{"type":["string","null"]},
          "PROBABILITY":{"type":["number","string"]}
        },
        "additionalProperties": true
      },
      "description":"Ranked list of probable destination ports (VI04)."
    },
    "GENERATED_AT_UTC": {
      "type":"string",
      "format":"date-time",
      "description":"UTC timestamp the forecast was generated."
    }
  },
  "required":["MMSI"],
  "additionalProperties": true
}