AIS - is a transponder system for ships intending to increase the safety at sea. It operates in the VHF band.
The two frequencies used worldwide are 161.975 and 162.025 MHz (channels 87B and 88B, or AIS1 and AIS2).
An AIS transmitter regularly transmits the ship's position, heading, speed and MMSI
(the unique maritime identification number). This data is received by ships in the vicinity...

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