In most instances, Hull Identification Numbers (HIN) are assigned and affixed by the manufacturer. The HIN, which is a unique 12-digit number, should be permanently affixed to the hull, as well as one other location on the vessel. The HIN registry system provides a way to distinguish vessels from one another and to trace vessels from their date of manufacture. Applying for a Hull Identification Number U.S. §181.23 stipulates that all vessels manufactured after 1972 are to have a hull number....