The completed form will include a description of the watercraft, the purchase price, and both parties' signatures. PrintFriendly allows both buyers and sellers to sign the Boat Bill of Sale PDF electronically.First, you should ensure you have the registration for every boat component and the title handy. A boat bill of sale is a legal document that records the transfer of ownership of a vessel or watercraft depending on what state you're in. The process is fast and easy. All you have to do is fill out our easy-to-understand questionnaire. Document the transfer of ownership of a boat.