[JohnRPollard]

One of the first things I'd want to know is whether the marina has a lien on the boat for storage or repairs. I would not accept ownership of the vessel until I knew the answer, because the lien could easily exceed the value of the boat many fold. If that is the case, the marina "owns it" and it becomes their issue to deal with.

Beyond that -- the advice posted by others above is pretty sound.