You can register a documented boat. Some states require you to do so.Went to register my boat in Louisiana. Was told I would have to first have it undocumented with the Coast Guard. Sounds crazy to me. Are other states like this> Why?
What you may be referring to is titling your boat. You cannot have a boat that is both documented with USCG and titled in a state. You need to cancel your documentation before you title it in a state. If you manage to add one without canceling the other, you may never be able to sell the boat, because lenders will not be willing to lend money to a buyer. A lender wants to secure the boat with a lien, and they can lien against the title or documentation, but not both. So if you have both and that fact comes up on a title/doc search, lenders will run away fast. Otherwise the boat is not secured, because you would have a title or documentation that has no lien on it, even though the bank owns the boat.