Boating Coach US
Sound signalsQuestion 117 of 352

At what length must a vessel carry a whistle?

  1. Any length
  2. 7 meters or more
  3. 12 meters or more
  4. 20 meters or more
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Correct answer: 12 meters or more

Boats of 12 meters and longer need a whistle.

Source: US Code of Federal Regulations (eCFR), 33 CFR Part 83: Inland Navigation Rules, § 83.33 Equipment for sound signals (Rule 33)

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Questions last reviewed: 18 October 2026