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Sound signalsQuestion 116 of 352

How long is a prolonged blast?

  1. About 1 second
  2. 2 to 3 seconds
  3. 8 to 10 seconds
  4. 4 to 6 seconds
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Correct answer: 4 to 6 seconds

A prolonged blast lasts from 4 to 6 seconds.

Source: US Code of Federal Regulations (eCFR), 33 CFR Part 83: Inland Navigation Rules, § 83.32 Definitions (Rule 32)

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Questions last reviewed: 18 October 2026