MMSI - Maritime Mobile Service Identity

Modern marine radios now feature Digital Selective Calling (DSC) for routine operations and for automated distress hailing. These features can only be used if your radio is programmed with a unique code called a Maritime Mobile Service Identity, or MMSI.

The United States Power Squadrons is authorized by the Federal Communications Commission and the US Coast Guard to issue MMSIs to US flagged vessels not subject to Safety of Life at Sea (SOLAS) Convention requirements. This includes almost all recreational boats.

For more information, or to obtain an MMSI number, please visit the USPS website at: https://www.usps.org/php/mmsi_new/

If you need assistance please contact

mmsi@usps.org