Boating Coach US
Sound signalsQuestion 135 of 352

In fog, a boat towing another vessel sounds which signal at intervals of not more than 2 minutes?

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

A towing or pushing vessel uses the long-short-short signal instead of the power-driven signals.

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