Boating Coach US
Aids to navigationQuestion 260 of 352

How fast do ordinary flashing lights on side marks normally flash?

  1. Exactly 60 flashes a minute
  2. Not more than 30 flashes a minute
  3. At least 90 flashes a minute
  4. One flash every ten minutes
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Correct answer: Not more than 30 flashes a minute

Side marks use regular flashing, which is no more than 30 flashes in a minute.

Source: US Code of Federal Regulations (eCFR), 33 CFR Part 62: United States Aids to Navigation System, § 62.45 Light characteristics

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Questions last reviewed: 18 October 2026