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Digital Selective Calling
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ITU-R Rec. M.493-13:

Digital selective-calling system for use in the maritime mobile service.

IEC 61097-3:

Global maritime distress and safety system (GMDSS) - Part 3: Digital selective calling (DSC) equipment - Operational and performance requirements, methods of testing and required testing results.

IEC 62238:

Maritime navigation and radiocommunication equipment and systems - VHF radiotelephone equipment incorporating Class "D" Digital Selective Calling (DSC) - Methods of testing and required test results.