Many countries will not accept a U.S. State registration
, at least not officially. While you might not have problems, it only takes one officer one time to not accept the papers to get into a whole lot of problems.
When clearing in, at least in the Caribbean
, all you are required to present is yourself, your passport, the clearance form from the last port of departure, your boat's registration
. The U.S. does not normally issue the clearing-out form, but will if you ask for it; the BVI will let you clear in without papers if you state that your are coming from the USA.
I just re-read your post and see that you intend to stray further afield than the Caribbean
, in which case you will most certainly need a national rather than a state registration.