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Sound signalsQuestion 134 of 352

A sailboat is underway in fog. Which signal does it sound?

  1. One prolonged blast
  2. Two prolonged blasts
  3. One prolonged blast followed by two short blasts
  4. Three short blasts
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Correct answer: One prolonged blast followed by two short blasts

Sailing vessels use the same signal as fishing, towing and restricted vessels.

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