Boating Coach US
Federal law and registrationQuestion 2 of 352

What is the smallest height allowed for the registration number characters?

  1. 1 inch
  2. 3 inches
  3. 2 inches
  4. 6 inches
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Correct answer: 3 inches

The characters must be plain vertical block letters at least 3 inches tall.

Source: US Code of Federal Regulations (eCFR), 33 CFR Part 173: Vessel Numbering and Casualty and Accident Reporting, § 173.27 Numbers: Display; size; color

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Questions last reviewed: 18 October 2026