Sound signalsQuestion 115 of 352

How long is a short blast?

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

A short blast lasts about 1 second.

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