Definition
A VHF data link operating on two dedicated channels near 162 MHz, AIS 1 (161.975 MHz) and AIS 2 (162.025 MHz), using self-organising time division multiple access to share time slots without a central controller. Transponders broadcast GNSS-derived position, course and speed over ground, heading and identity, and receive the same from others. Range is roughly line-of-sight, typically 20 to 40 nautical miles ship to ship, considerably more to shore stations or satellites.
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