BoatUS - MMSI Registration

Maritime Mobile Service Identity (MMSI) is a unique 9 digit number that is assigned to a (Digital Selective Calling) DSC radio or an AIS unit. Similar to a cell phone number, your MMSI number is your unique calling number for DSC radios or an AIS unit. The information provided when obtaining a MMSI number is transferred into the U.S. Coast Guard's national distress database for use in emergency situations.

MMSI numbers are free for BoatUS Members or $25 for non-members.

Registration Criteria

BoatUS has been authorized by both the Federal Communications Commission (FCC) and the U.S. Coast Guard to assign MMSI numbers only to vessels that meet the following criteria:

If you do not meet these criteria, you are legally required to obtain a Ship Station License from the FCC. They will issue an MMSI number with a Ship Station License.