Boating Coach US
Sound signalsQuestion 133 of 352

Your power boat is stopped in fog and makes no way. What signal do you sound?

  1. One prolonged blast
  2. Two prolonged blasts, about 2 seconds apart
  3. One short blast
  4. Three short blasts
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Correct answer: Two prolonged blasts, about 2 seconds apart

Two prolonged blasts, repeated at least every 2 minutes, show a stopped power boat.

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