Missing or incorrect AIS static data requires immediate verification through prescribed own-ship checks or validation via other vessels and shore stations. Static information includes the MMSI, call sign, name, IMO number, dimensions, ship type, and antenna location. This data is generally entered at installation and must be updated whenever the vessel's name, MMSI, antenna location, dimensions, or ship type changes. Because these fields are configured aboard, they can contain invalid or duplicated identifiers, meaning a received static report alone does not confirm that every field is current or correctly associated with the observed vessel. The officer of the watch should check own-ship static information when there is reason and at least once per voyage or once per month, whichever is shorter. The MCA also recommends checking transmitted information via another vessel or shore station.
