AIS vessel identity links messages to a configured MMSI, which anchors the signal to specific static data fields. This MMSI serves as the primary anchor for associating a target with its claimed identity on navigation displays. The system relies on static information that includes the call sign, vessel name, IMO number, dimensions, and ship type. These details are configured data rather than measurements made by a receiving station, meaning they require amendment after any identity or ownership changes occur. These configured identity details are reported rather than measured by the receiving station.
While AIS helps a bridge team identify and track an equipped target, it associates a name, call sign, ship type, and navigational status with the signal without independently authenticating the claim. The displayed information provides context but does not guarantee the accuracy of the vessel's true identity. Invalid or duplicate MMSIs can produce misleading target association, potentially causing a display to show one vessel jumping between positions. Operators must recognize that AIS identity details are not conclusive proof of ownership or identity without independent corroboration from other sources.
