DSC (Digital Selective Calling) Radio 

DSC is “new” (as of 1999) System for Digital Calling and Distress Messaging

DSC Radios Need a Maritime Mobile Service Identity (MMSI) for Full Functionality

Note:  You can program MMSI number in your radio only once or twice, depending on brand - If you change it (by getting FCC license later) you will have to send it to the manufacturer to get it re-programmed

Two Classes of DSC Radio:

Making a Quick Distress Call – DSC 

Making a Designated Distress Call – DSC 

Designated Distress Call Helps Coast Guard understand distress better
Other types of DSC Calls  -  consult your DSC Radio Manual

Routine Ship-to-Ship:

Position  Request
Group Call  -  DSC