MMSI, the Maritime Mobile Service Identity, at BoatUS, has expanded our Frequently Asked Questions (FAQ's) to answer your questions regarding online difficulties, VHF radio questions and general questions about MMSI 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 at

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Online Difficulties

I cannot proceed with the application. The system defaults to the main page. Why?

Your security settings may be too high. You may need to enable cookie support in your browser to use the MMSI application pages. A cookie is a small piece of information that is saved on your computer by a web site.

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I do not remember my login/pw and was unable to retrieve them by my old email address. How do I access my registration?

If your email address has changed and you can no longer access the email account that you originally registered with, press the control key and click here to send an update request to the System Administrator.  The Administrator will use the information provided to access and verify the registrant’s information prior to updating the email address.  Once updated, the registrant’s login/pw will be emailed from the database to the new email address.  Be sure to check your spam filter if you do not receive the email. Requests for login and password are fulfilled during regular business hours M-F 9:00a.m. to 6:00p.m. EST.

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The system does not recognize my login/pw.

Login and password are case sensitive and must be input exactly as previously registered.  If you are uncertain of your login and password you can retrieve them from the login page at If you are a member of BoatUS and trying to use your logon or member#, it will not work for the MMSI database.  You will need to retrieve your actual MMSI registration login/pw from the MMSI login page.

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I cannot input my full EPIRB ID Code

The EPIRB Field has exactly 15 digits.  Try backspacing to the beginning of the field as there may be an extra space prior to where you started inputting the number.

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Are EPIRBs part of this radio registration process?

No. Registrations of EPIRBs (Emergency Position-Indicating Radio Beacon) is done through NOAA, NOAA oversees this satellite search and rescue system which is not related to DSC VHF marine radios.

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