OUPV & 100-Ton Master · Radio — DSC and MMSI
To use the Digital Selective Calling (DSC) distress feature of a modern VHF radio, the set must be:
- ALicensed as an aircraft radio
- BTuned only to Channel 16 with no other setup
- CProgrammed with the vessel's MMSI and connected to a GPS position source✓ Correct
- DDisconnected from any GPS
Explanation
A DSC-equipped VHF needs a programmed Maritime Mobile Service Identity (MMSI) and a GPS feed so that pressing the distress button sends an automated alert on Channel 70 containing the vessel's identity and position. Without the MMSI and position input, the DSC alert is incomplete.
Authority: 47 CFR; GMDSS/DSC standards
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