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Distress signalsQuestion 277 of 352

Which light signal shows distress?

  1. A steady green light
  2. A high-intensity white light flashing 50 to 70 times a minute
  3. A red light that does not flash
  4. A white light flashing once a minute
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Correct answer: A high-intensity white light flashing 50 to 70 times a minute

A strong white light flashing 50 to 70 times a minute is a distress signal.

Source: US Code of Federal Regulations (eCFR), 33 CFR Part 87: Annex IV: Distress Signals, § 87.01 Need of assistance

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Questions last reviewed: 18 October 2026