Registration
I just went through all this with my Catalina 320, the "Lady Jane".If you want U.S. registration & plan to sail outside the U.S. territorial waters then you must do a Federal Documention of your boat through the U.S. Coast Guard. Doing so usually pre-empts any State documentation & registration laws. Contact the U.S. Coast Guard regional office for info, or log onto their website. I downloaded all the forms & instructions, filled them out, sent them in (with checks for the documentation (~$134) and filing of the bill-of-sale (~$8.00). There is an annual renewal required, but its not as expensive as the initial documentation.Or, you can hire one of the documentation services who spend 15 minutes filling out your forms, charge you $100, and send in the forms (with your two checks) for you.Be advised that if you sail into the territorial waters of another country on a U.S. flagged vessel, that vessel must have an FCC station licence for the electronic emitters (VHF, SSB, RADAR, etc) as well. And, the operators must have operator permits. The USCG website has a link to the FCC website where you can download the necessary forms & instructions, too.Once the boat is documented, you must put the name on the outer hull, port & starboard, and the hailing port on the stern. And, the USCG Documentation number must be applied to the inner hull. There are no major restrictions on the boat name, and the "hailing port" can be anywhere -- doesn't even have to be a waterside place!Here in Massachusetts, however you must (a) still pay the state sales tax, and (b) pay an excise tax to the town where the boat is principly moored or docked. Also, the state requires the motor-driven dinghy to be registered, and a number affixed on the hull. The dinghy is not included in the USCG documentation.Better check into the legalities & tax rules regarding foreign-flagging a vessel. It may not be as good a deal as it might look at first.Hope that helps. --Ron(s/v Lady Jane, Marblehead, MA)