Definition
DSC is the automated alerting layer of the GMDSS. Holding the guarded distress button on a DSC-equipped VHF, MF or HF set transmits a burst containing the vessel's MMSI, the position and time taken from a connected or internal GNSS receiver, and where selected the nature of the distress. Receiving sets alarm and display the data. The alert is only the alarm; it must be followed by a voice Mayday on channel 16.
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