
The Maritime Mobile Service Identity (MMSI) number is a unique identifier for boats. MMSI numbers are for US-registered or documented recreational vessels under 65 feet that do not visit or communicate with foreign ports. MMSI numbers can be transferred to a new owner if the previous owner has cancelled their registration. If the previous owner has not closed the account, BoatUS will attempt to contact them to verify that they are not still using the number in another radio. If the previous owner cannot be contacted or is still improperly using the MMSI, the new owner will need to reprogram the radio with a new number.
| Characteristics | Values |
|---|---|
| Can MMSI be transferred to a new owner? | Yes, if the previous owner has cancelled their registration or their ship station license |
| Can BoatUS assist with the transfer process? | No, but BoatUS can transfer the MMSI number to the new owner if it was assigned by BoatUS and the previous owner has cancelled their registration |
| How to transfer MMSI to a new owner? | Log into your MMSI account and select the "Transfer to New Owner" button |
| What happens if the previous owner has not closed their account? | BoatUS will attempt to contact them to verify that they are not still using the number in another radio |
| What happens if the previous owner cannot be contacted or is still improperly using the MMSI? | The radio must be reprogrammed with a new number |
| What is the process if the new owner is not required to carry a Ship Station License? | The new owner can input the FCC-assigned MMSI into the BoatUS database |
| What is the process if the previous owner has cancelled their ship station license? | The MMSI can be transferred to the ship station license of the new owner and programmed into the radio by contacting the FCC |
| What is the process for updating registration with new boat information? | If all radios with the MMSI number have been given to the new owner, the number must be transferred to the new owner; if some radios have been retained, the owner must work with the new owner to determine who will obtain a new MMSI number and have the radio(s) reprogrammed |
| What is the process for transferring registration data for FCC-assigned MMSI numbers? | The registration data must be transferred into the International Telecom Union (ITU) database, and the MMSI number must end in zero |
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What You'll Learn

Transferring an MMSI number to a new owner
If you kept all the radios that had the MMSI number programmed into it, you can update your registration with the new boat information when you buy a new boat. If all the radios that are programmed with the MMSI number have been given to the new owner, you must transfer the MMSI number to the new owner by logging into your MMSI account and selecting the “Transfer to New Owner” button. This cancels your MMSI registration and avoids having any future distress calls from the MMSI number linked to your personal information. The new owner will then receive an email with instructions on how to claim the MMSI number.
If the MMSI number was assigned by BoatUS and the previous owner has cancelled their registration, BoatUS can transfer the MMSI number to the new owner. If the previous owner has not closed the account, BoatUS will attempt to contact them to verify that they are not still using the number in another radio. If the previous owner cannot be contacted or is still improperly using the MMSI, you will need to reprogram the radio with a new number.
If the MMSI is connected with an FCC-assigned ship station license, BoatUS cannot assist with the transfer process. However, if the prior owner of the MMSI has cancelled the ship station license through the FCC, the MMSI can be transferred to the ship station license of the new owner of the vessel and programmed radio by contacting the FCC at 1-877-480-3201. If the new owner is not required to carry a Ship Station License and has confirmed that the previous owner has cancelled their ship station license, the new owner can input the FCC-assigned MMSI into the BoatUS database by going to https://www.boatus.com/MMSI/MMSI/NonBoatUSMMSI.
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Cancelling an MMSI registration
An MMSI number can be transferred to a new owner, but it is recommended that you cancel your MMSI registration when selling a radio-equipped vessel. This is because if the new owner transmits a distress alert using the radio, you could be held liable.
To cancel your MMSI registration, you must log into your MMSI account and select the 'Transfer to New Owner' button. This cancels your MMSI registration and avoids having any future distress calls from the MMSI number linked to your personal information. The new owner will then receive an email with instructions on how to claim the MMSI number.
If you are unable to contact the new owner, you must update your registration to note the situation and, if possible, identify the purchaser, and then cancel the registration. Cancelled MMSI registrations remain in the database and can be useful during search and rescue.
If you are transferring an FCC-assigned MMSI, you must contact the FCC at 1-877-480-3201.
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Updating an MMSI registration with new boat information
If you kept all the radios that had the MMSI number programmed into it, you can update your registration with the new boat information when you buy a new boat. If all the radios that are programmed with the MMSI number have been given to the new owner, you must transfer the MMSI number to the new owner by logging into your MMSI account and selecting the “Transfer to New Owner” button. This cancels your MMSI registration and avoids having any future distress calls from the MMSI number linked to you and your personal information. The new owner will then receive an email with instructions on how to claim the MMSI number.
If the MMSI number was assigned by BoatUS and the previous owner has cancelled their registration, BoatUS can transfer the MMSI number to the new owner. If the previous owner has not closed the account, BoatUS will attempt to contact them to verify that they are not still using the number in another radio. If the previous owner cannot be contacted or is still improperly using the MMSI, you will need to reprogram the radio with a new number. To check if your MMSI was assigned through BoatUS, email [email protected].
BoatUS cannot assist with the MMSI transfer process for an FCC assigned MMSI in connection with a ship station license. However, if the prior owner of the MMSI has cancelled the ship station license through the FCC, the MMSI can be transferred to the ship station license of the new owner of the vessel and programmed radio by contacting the FCC at 1-877-480-3201. If the new owner is not required to carry a Ship Station License and has confirmed that the previous owner has cancelled their ship station license, the new owner can input the FCC assigned MMSI into the BoatUS database by going to https://www.boatus.com/MMSI/MMSI/NonBoatUSMMSI.
Note that BoatUS MMSI numbers are for US-registered or documented, recreational vessels under 65’ that are not visiting or communicating with foreign ports. The registration data provided to BoatUS is only transferred into the U.S. Coast Guard Search & Rescue Database (MISLE). International search & rescue agencies do not have access to the registration data provided to BoatUS. Registration data for FCC-assigned MMSI numbers go into the International Telecom Union (ITU) database that is accessible to international search & rescue agencies. In order to be accepted into the ITU database, any FCC assigned MMSI must end in zero.
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MMSI numbers for US-registered vessels
MMSI numbers are for US-registered or documented, recreational vessels under 65 feet that are not visiting or communicating with foreign ports. If you kept all the radios that had the MMSI number programmed into it, you can update your registration with the new boat information when you buy a new boat. If all the radios that are programmed with the MMSI number have been given to the new owner, you must transfer the MMSI number to the new owner by logging into your MMSI account and selecting the “Transfer to New Owner” button. This cancels your MMSI registration and avoids having any future distress calls from the MMSI number linked to you and your personal information. The new owner will then receive an email with instructions on how to claim the MMSI number.
If the MMSI number was assigned by BoatUS and the previous owner has cancelled their registration, BoatUS can transfer the MMSI number to the new owner. If the previous owner has not closed the account, BoatUS will attempt to contact them to verify that they are not still using the number in another radio. If the previous owner cannot be contacted or is still improperly using the MMSI, you will need to reprogram the radio with a new number.
If you retained one or more of the radios with the MMSI number and the new owner also has one or more radios with the MMSI number programmed into it, you need to work with the new owner to determine who is going to be responsible for obtaining a new MMSI number and having the radio(s) reprogrammed.
BoatUS cannot assist with the MMSI transfer process for an FCC-assigned MMSI in connection with a ship station license. However, if the prior owner of the MMSI has cancelled the ship station license through the FCC, the MMSI can be transferred to the ship station license of the new owner of the vessel and programmed radio by contacting the FCC. If the new owner is not required to carry a Ship Station License and has confirmed that the previous owner has cancelled his ship station license, the new owner can input the FCC-assigned MMSI into the BoatUS database.
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FCC-assigned MMSI numbers
MMSI numbers are assigned to individual vessels. If you buy a new boat, you can update your registration with the new boat information. If you sell your boat, you must transfer the MMSI number to the new owner by logging into your MMSI account and selecting the “Transfer to New Owner” button. This cancels your MMSI registration and avoids having any future distress calls from the MMSI number linked to you and your personal information.
If your vessel requires licensing by the FCC, you will obtain an MMSI number during the application/licensing process when you file online with the FCC. In order to obtain a new MMSI number, indicate that you wish to be assigned a new number in an attachment to your application. An MMSI will not be issued without the presence of an attachment on the application. Fixed Coast stations will use the 0102M3I4D5X6X7X8X9 format, consistent with ITU Regulations. Licenses that are based upon a mobile marine framework, and utilizing a DSC-Capable VHF Radio may request an 81M2I3D4X5X6X7X8X9 format in order to ensure greater accuracy and safety in marine emergencies.
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Frequently asked questions
Yes, if the MMSI number was assigned by BoatUS and the previous owner has cancelled their registration, BoatUS can transfer the MMSI number to the new owner.
BoatUS will attempt to contact them to verify that they are not still using the number in another radio. If the previous owner cannot be contacted or is still improperly using the MMSI, you will need to reprogram the radio with a new number.
Log into your MMSI account and select the 'Transfer to New Owner' button. This cancels your MMSI registration and avoids having any future distress calls from the MMSI number linked to your personal information. The new owner will then receive an email with instructions on how to claim the MMSI number.
Yes, if you kept all the radios that had the MMSI number programmed into it, you can update your registration with the new boat information when you buy a new boat.











































