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Sound signalsQuestion 136 of 352

A vessel at anchor rings its bell in fog. How often, and for how long?

  1. One stroke every 2 minutes
  2. Rapidly for 2 seconds, every 5 minutes
  3. Rapidly for about 5 seconds, every minute
  4. Three strokes every 30 seconds
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Correct answer: Rapidly for about 5 seconds, every minute

The bell signal for a vessel at anchor is repeated at least once a minute.

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