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AIS, which stands for Automatic Identification System, is at its most basic level an electronic transponder installed on a boat or vessel that continuously transmits a VHF signal containing information including its name, call sign, type and position.  An AIS receiver mounted on another craft can then receive that information and use the signal to calculate and display the vessel's course and speed.  The end result is a display showing all AIS-enabled craft within VHF range, along with their course and speed.  AIS thus plays an invaluable role, particularly in areas of high traffic, to track the progress of other craft and thereby minimise the risk of collision.

There are two classes of AIS:

* Class A – mandated for use on Safety Of Life At Sea Chapter V vessels – basically big ships

* Class B – a low power, lower cost derivative for leisure and non-SOLAS markets.