Module 8 - Digital Selective Calling

What DSC Adds

Digital Selective Calling sends digital alerts and calls using MMSI identities. It can alert coast stations or other vessels, propose a working channel, and send distress information rapidly.

DSC does not remove the need for voice procedure. In distress, the digital alert is followed by the voice Mayday; in routine calls, the digital call establishes contact and the conversation happens by radiotelephony.

Key points

  • DSC uses Channel 70 for digital signalling.
  • MMSI identifies the station digitally.
  • Routine DSC can call an individual station and propose a working channel.
  • Distress DSC alerts require careful voice follow-up.

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