Boating Coach US
Sound signalsQuestion 131 of 352

Two boats agree on how to pass by marine radio. Must they also sound whistle signals?

  1. No, but they may
  2. Yes, always
  3. Yes, but only at night
  4. No, and they may not
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Correct answer: No, but they may

Agreement by radio replaces the whistle signals, but the signals are still allowed.

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