GMDSS Element 7 (Radio Operating Practices) USCG Q#135 (Set 5)

A valid MMSI number for a DSC call to a specific group of vessels is:

Official USCG Answer & Rule Citation

Correct Answer: Option B — 030327931

Group MMSI numbers begin with a single zero followed by the three-digit MID and five specific subscriber digits, enabling DSC transmissions to simultaneously alert a designated fleet or specific group of vessels.

All GMDSS Element 7 (Radio Operating Practices) Sets Practice Set 5