Boating Coach US
Boat capacity and constructionQuestion 321 of 352

Where is the duplicate hull identification number placed?

  1. Next to the primary number
  2. In an unexposed place inside the boat or under a fitting
  3. On the outside of the bow
  4. On the trailer frame
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Correct answer: In an unexposed place inside the boat or under a fitting

The second number is hidden on the interior or beneath hardware.

Source: US Code of Federal Regulations (eCFR), 33 CFR Part 181: Manufacturer Requirements, § 181.29 Hull identification number display

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Questions last reviewed: 18 October 2026