a nameless boat is a crime in any jurisdiction...
I agree
registered boats must have the registration numbers no less than 3" tall.... in every state.
documented vessles must have the name of the vessel, and hailing port (city
and state) marked on the hull in lettering no less than 4 inches tall...
anything less and you are not in compliance. you may get away with smaller lettering for awhile... until the one time your trip is ruined because you decided the law wasn't to your satisfaction....
a few years ago I saw a boat temporarily impounded until it was corrected, and the owner/operator was fined because he thought the law meant close to three inches tall should be good enough....
the authorities are kinda narrow minded when it comes to stuff like that.