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The Boater's Guide of Iowa, A Handbook of Boating Laws and Responsibilities Iowa DNR Boater Education logo

It's the Law: Before Going Out

Hull Identification Number

The Hull Identification Number (HIN) is a unique, 12-digit number, assigned by the manufacturer, to vessels built after 1972.

  • Hull Identification Numbers distinguish one vessel from another. They are engraved or stamped in the hull transom, on a metal plate attached to the transom, or printed on inflated rafts and kayaks.
  • Record the HIN and put in a place other than the vessel in case warranty problems arise or the vessel is lost or stolen.
  • If your vessel is homemade, the Department of Natural Resources may issue you a HIN, which you then must affix permanently to the transom.
  • It is illegal to destroy, remove, cover, or mutilate a HIN.

Hull identification number

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The Boater's Guide of Iowa, A Handbook of Boating Laws and Responsibilities
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