The MMSI site at has expanded the Frequently Asked Questions (FAQ's) regarding online registration of DSC-VHF radios, VHF radio questions, Rescue 21 and general questions about MMSI (Maritime Mobile Service Identity) and how it pertains to your boat.

Questions are grouped by category, so please click on the appropriate question to view the answer. For additional information please contact us

General Questions


Online Difficulties


VHF Radio Questions


What is MMSI?


MMSI as it Pertains to the Boat


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