Boating Coach
Before you goQuestion 24 of 566

What is the minimum size of each character in a hull serial number?

  1. 6 mm high and wide
  2. 2 mm high and wide
  3. 12 mm high and wide
  4. 7.5 cm high and wide
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Correct answer: 6 mm high and wide

Each character must be at least 6 mm (1/4 inch) high and wide.

Source: Safe Boating Guide (TP 511E, 2026), Hull serial number (HIN), page 7

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Questions last reviewed: 18 October 2026