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I'm not a boater, but it sounds like you might be a good candidate to talk to a credit union about a boat loan.
Good luck!
Alliant, PenFed and NFCU will finance a boat. I believe Alliant and PenFed will only loan "book value" so you have to check into that.
I recall the rate being 7.5%. But this was for my brother with scores in the 730 range.