The UCC was or is a way that banks/lending institutions would register their lien on the boat when you borrowed the $$ to buy it. The UCC stated that Bank xyz had a monetary interest in the boat if you did not pay them back. Since you paid it off, make sure it indicates that the UCC has paid in full, and the bank has released its lien on the boat. It needs (or used to be) recorded as a matter of public record that the UCC has been satisfied/paid in full.
GO BIG ORANGE !
I meant to behave, but there were just way too many other options available at the time.