GMDSS Element 7 (Radio Operating Practices) USCG Q#129 (Set 5)

How many digits are in the MID (Maritime Identification Digits)?

Official USCG Answer & Rule Citation

Correct Answer: Option C — 3

The Maritime Identification Digits (MID) always comprise exactly three numerical digits, forming the prefix of a ship's nine-digit MMSI number to designate its flag state administration under ITU Radio Regulations.

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