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Hull Identification Number (HIN) A twelve character number inscribed at the starboard upper corner of the transom. A HIN is required on ALL recreational vessels. The first three characters of the HIN indicate the boat manufacturer. This portion of the HIN is called a MIC (Manufacturers Identification Code). The model year and month and year of production are also included in the HIN, along with a unique serial number for each hull. Additional information regarding HINs follows: |