Automatic Identification System [AIS] [National Security] Law and Legal Definition

The Automatic Identification System (AIS) is an automated tracking system employed on ships and by Vessel Traffic Services (VTS) for discovering and locating vessels by electronically exchanging data with other nearby ships and VTS stations. AIS information adds to marine radar by transmitting information that would prevent collusion of vessels in the high seas. The information obtained through AIS equipment, includes position of the vessel, course of the vessel, and speed of the vessel.