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Furuno FM2721 Manual

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Communication Distance
The FM-2721 operates on the VHF band assigned for maritime mobile stations.
The VHF radio wave, unlike LF or HF, propagates like a light ray. Thus communication is only available with another
VHF antenna which is above the horizon. This is called line-of-sight.
Even if a clear line-of-sight condition exists, the radio wave is attenuated along the signal path. The communication
distance is limited also by transmitter power, antenna efficiency and receiver sensitivity.
The average communication range, using 25 W marine VHF, is 10 to 15 nm for ship-to-ship and 20 to 30 nm for
ship-to-shore.
Note that an obstruction in the signal path, such as a large ship, crane, building or mountain, can destroy VHF
communications even for a short distance.
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