Boating Coach US
Boat capacity and constructionQuestion 317 of 352

Which letters are not used in the serial part of a hull identification number?

  1. A, B and C
  2. X, Y and Z
  3. L, M and N
  4. I, O and Q
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Correct answer: I, O and Q

Characters four to eight of the number may be letters or digits, except I, O and Q.

Source: US Code of Federal Regulations (eCFR), 33 CFR Part 181: Manufacturer Requirements, § 181.25 Hull identification number format

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Questions last reviewed: 18 October 2026