http://www.boatus.com/mmsi/MM5.htm#q39
Is the MMSI unique to the boat owner or does it stay with the boat and radio?
The MMSI stays with the radio which it is programmed into.
- If you sell the boat but keep the radio, you can update with the new boat information in the Edit Registration Screen.
- If you sell the boat with the radio, you must cancel your MMSI registration to avoid having the distress linked to you and your personal information should the new owner fail to reprogram the radio or request that the MMSI be transferred over to them.
- If you kept the boat but have traded or replaced the radio which was programmed, you must cancel your MMSI registration for the same reason stated above.
- If you obtained a second radio to go on board the same boat, you may program the same MMSI number into that radio
El MMSI identifica el barco no el armador. Imagínate un barco de charter.

Otra cosa es que al cambiar de armador, tengamos que actualizar los datos de contacto etc
Entre otras cosa porque al registrar el MMSI te piden 2 teléfonos para descartar falsas alarmas de la radiobaliza etc
Es más. Puedes tener una radiobaliza, EPIRB, sin tener estación radio con ella. (VHFs viejos etc)
