Which of the following statements concerning MMSI is true?
Official USCG Answer & Rule Citation
Correct Answer: Option B — All MMSI numbers are 9 digits and contain an MID.
Maritime Mobile Service Identity (MMSI) numbers are standardized globally as 9-digit identifiers under ITU and IMO GMDSS guidelines. Every assigned MMSI incorporates a 3-digit Maritime Identification Digit (MID) indicating the country of registry, ensuring unique vessel and coast station identification.
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