Describe briefly what an automatic identification system (AIS) is and how service

An automatic identification system (AIS) is an automated tracking device fitted to a vehicle or vessel to display objects around the vicinity of the vessel on a screen.  This helps the driver of a vehicle, for instance, to identify such objects and know how to afford head-on collisions.  For a ship, the signal sent to the VT station helps in monitoring movements around the ship.

Explanation:

Most ships are fitted with AIS to enable Vessel Tracking services.  The AIS also shows the other ships that are around and transmits the information to the Vessel Tracking Station (VTS).  Some modern cars are fitted with AIS to help the driver to identify obstructive objects.  The identified signal is displayed on the dashboard of the car just as the maritime AIS displays on the ship's dashboard as it also transmits to the VTS.

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Explanation: