A Maryland boat bill of sale confirms that a boat has been purchased in a private transaction. The document relays both the parties' information.If you're purchasing or selling a boat in Maryland, use an MD Boat Bill of Sale to prove a transfer of ownership has taken place. This implemented contract documents key components of the sale, including information associated with the involved parties, the vessel, and the sale price. Agreement Buyer agrees to purchase and Seller agrees to sell, all right, title and interest to the Vessel on the terms and. 1. Complete all sections with accurate information. A good plan for boat tax should always start with being sure that the initial transfer takes place in a favorable location.