GMDSS Element 7 (Radio Operating Practices) USCG Q#128 (Set 5)

What is the MID?

Official USCG Answer & Rule Citation

Correct Answer: Option B — Maritime Identification Digits

MID stands for Maritime Identification Digits, which form the first three numbers of any standard nine-digit Maritime Mobile Service Identity (MMSI), identifying the country or geographical area of the vessel's administration.

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