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Sound signalsQuestion 130 of 352

One flash of a signal light can add to a whistle signal. What does one flash mean?

  1. I intend to leave you on my starboard side
  2. I am operating astern propulsion
  3. I intend to leave you on my port side
  4. I doubt your intentions
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Correct answer: I intend to leave you on my port side

Light flashes match the whistle: one for port, two for starboard, three for astern.

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