Those are great rates and credit unions can be a great place to go. Some credit unions also will allow you to purchase with zero down which is less than the national marine lenders offering 10% to 20% down. Usually they will be shorter terms such as 6 to 10 years where the national guys are 15 years above $25k. Money down and shorter terms hopefully will prevent you from going upside down.
I am actually a boat loan broker and found this post in google. There actually can be quite a bit to getting a loan. Knowing your credit score and debt to income ration before you start is a very good thing. Don’t let everyone pull your credit. Make some calls first.