Boating Coach US
Sound signalsQuestion 138 of 352

A boat shorter than 12 meters has no bell or whistle for fog signals. What must it do?

  1. Make no signal
  2. Make some other efficient sound signal at least every 2 minutes
  3. Make a signal every 10 minutes
  4. Turn on its anchor light only
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Correct answer: Make some other efficient sound signal at least every 2 minutes

Small boats may use any efficient sound signal, such as a horn, at intervals of not more than 2 minutes.

Source: US Code of Federal Regulations (eCFR), 33 CFR Part 83: Inland Navigation Rules, § 83.35 Sound signals in restricted visibility (Rule 35)

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Questions last reviewed: 18 October 2026