In Texas, a bill of sale is required to legally transfer vessel ownership. The form consists of the significant vehicle, buyer, seller, and sale data, along with affirming signatures from both parties.Boat Bill of Sale For the sale of privately owned watercraft. Download: PDF, Word (. Boat (Vessel) Bill of Sale Form Records the transfer of possession of a vessel in writing. It contains information about the buyer and the seller, a description of the vehicle being sold, and information about the transaction, such as price. The DMV does not provide a bill of sale document but this form may be used to legally transfer the ownership of a vehicle from one (1) party to another.