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VHF radios are the communication device and protocol of the water.

Radio protocol[edit]

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Digital selective calling (DSC)[edit]

Digital selective calling or DSC is a standard for sending pre-defined digital messages via the medium-frequency (MF), high-frequency (HF) and very-high-frequency (VHF) maritime radio systems. It is a core part of the Global Maritime Distress Safety System (GMDSS).[1]


  1. Wikipedia