Originally Posted by bhcva
"DO NOT get the MMSI number from Boat US"
Bill.....why do you say that?
If you are sure you are going to stay in US territorial waters, the BoatUS MMSI generator is fine.
But if you have any plans to go into other countries' territorial waters, only an FCC issued MMSI will be kosher.
As others have mentioned, inputting an MMSI into a radio is a one or two try event (models vary -- read the user manual carefully) before you have to send it back to the shop for a reset.