Re: MMSI From the FCC
"Yeah but you can't change the MMSI number once you've entered it into your VHF, can you"
That would be a very clever way to end the market in used radios and ensure a boat had to have new ones every time it changed owners. I don't think the radio makers were smart enough to get that required by law.
Wouldn't surprise me if some radios had a problem with that, due to cheapass designs.