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Digital selective calling (DSC) is a standard for transmitting predefined 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).
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distress dsc channel signal sent used safety urgency one hf vhf system ships station alert alerts mf maritime often 70
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