Boating Coach US
Sound signalsQuestion 129 of 352

You are leaving a dock or berth in a power boat. What signal do you sound?

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

A prolonged blast warns others that you are leaving the dock.

Source: US Code of Federal Regulations (eCFR), 33 CFR Part 83: Inland Navigation Rules, § 83.34 Maneuvering and warning signals (Rule 34)

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Questions last reviewed: 18 October 2026