All depends on your credit score, boat make, age of boat, HP of engines & your Debt to Income ratio.
The banks that will finance HP are dwindling quickly. Lakeland Bank here in NJ just pulled the plug on Marine Financing. They will now only finance only branch customers.
As far as national banks, very limited. Twin 525hp or less is relatively easy with a good score.
Over 800hp.........you need to be GOLDEN
As for rates today for 10yrs old or less:
5.50% fixed for 3yrs (525hp or less) over $100k
5.75% fixed 15 or 20yrs (525hp or less) over $100k
These rates are for GREAT credit and hp under twin 525hp