Using a California boat bill of sale streamlines the process while ensuring accuracy. Download a template here in PDF or Word format.The seller warrants the boat is in good working condition. The California bill of sale form, REG 135, allows a buyer to purchase a motorized vehicle or vessel in the State. All fields should be filled-in on the form. The seller warrants the boat is in good working condition. The form must be signed and can also be notarized for further validity. A California vessel bill of sale ascertains an owner's lawful boat possession. If you are completing a bill of sale to satisfy a vehicle registration requirement, the law requires that you provide a copy to the DMV.