AIS – which VHF band ?

A commercial vessels AIS unit has two dedicated VHF receivers and one transmitter to which the International Telecommunications Union (ITU) has allocated two dedicated frequencies, these are 161.975 MHz and 162.025 MHz (VHF 87B & 88B), however they may not be available in every part of the world.

In the United States for example, VHF 87A & 87B were recently allocated for AIS communications instead.

In addition the transponder unit includes a GPS system (GLONASS or GPS) to determine the ship’s own position and for time synchronization, as well as the means for displaying the received information from other AIS equipped ships.


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