Very High Frequency (VHF) - Nautical Know How

The radio-frequency band from 30 to 300 megahertz, including the maritime mobile channels around 156 to 174 megahertz.

Marine VHF supports voice, digital selective calling, AIS and other services on assigned frequencies and channel plans. Propagation is mainly line of sight, so antenna height, terrain, atmospheric conditions, transmitter power and receiver installation strongly affect range.

Channel purpose, watchkeeping and licensing depend on national and international radio rules. VHF range is not guaranteed, handheld antennas are low, and distress planning should not assume a coast station will receive every transmission.

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