{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://raw.githubusercontent.com/api-evangelist/marine-traffic/main/json-schema/marine-traffic-vessel-master-schema.json",
  "title": "MarineTraffic Vessel Master Data",
  "description": "Vessel master record (static AIS data + MarineTraffic vessel database) as returned by the VD02 vesselmasterdata endpoint.",
  "type": "object",
  "properties": {
    "MMSI": {"type":["string","integer"],"description":"Maritime Mobile Service Identity."},
    "IMO": {"type":["string","integer","null"],"description":"IMO number."},
    "SHIP_ID": {"type":["string","integer"],"description":"MarineTraffic internal vessel ID."},
    "SHIPNAME": {"type":"string","description":"Current vessel name."},
    "CALLSIGN": {"type":["string","null"],"description":"Radio call sign."},
    "FLAG": {"type":["string","null"],"description":"ISO 3166-1 alpha-2 flag state."},
    "TYPE_NAME": {"type":["string","null"],"description":"Human-readable ship type."},
    "SHIPTYPE": {"type":["string","integer"],"description":"AIS ship type code."},
    "BUILT": {"type":["string","integer","null"],"description":"Year of build."},
    "DEAD_WEIGHT": {"type":["number","string","null"],"description":"Deadweight tonnage (metric tons)."},
    "GROSS_TONNAGE": {"type":["number","string","null"],"description":"Gross tonnage."},
    "LENGTH": {"type":["number","string","null"],"description":"Overall length in metres."},
    "BREADTH": {"type":["number","string","null"],"description":"Beam (width) in metres."},
    "DEPTH": {"type":["number","string","null"],"description":"Moulded depth in metres."},
    "DRAUGHT": {"type":["number","string","null"],"description":"Maximum design draught in metres."},
    "OWNER": {"type":["string","null"],"description":"Beneficial owner / registered owner."},
    "MANAGER": {"type":["string","null"],"description":"Ship manager."},
    "BUILDER": {"type":["string","null"],"description":"Shipyard / builder."},
    "CLASS_SOCIETY": {"type":["string","null"],"description":"Classification society."},
    "STATUS": {"type":["string","null"],"description":"Operational status (e.g. \"Active\", \"Scrapped\")."},
    "HOME_PORT": {"type":["string","null"],"description":"Home port (from AIS or registry)."},
    "LAST_KNOWN_PORT": {"type":["string","null"],"description":"Last port visited."},
    "LAST_SIGNAL": {"type":["string","null"],"format":"date-time","description":"UTC timestamp of the last received AIS signal."}
  },
  "required":["MMSI","SHIP_ID","SHIPNAME"],
  "additionalProperties": true
}