Boat capacity and constructionQuestion 319 of 352

How many identical hull identification numbers must be on a boat hull?

  1. One
  2. Three
  3. Two
  4. Four
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Correct answer: Two

A primary and a duplicate number are required.

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