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Aids to navigationQuestion 230 of 352

How do IALA Region A lateral marks differ from Region B marks?

  1. Buoys are square and beacons are round
  2. Port marks are yellow and starboard marks are white
  3. Port marks are red and starboard marks are green
  4. They use the same colors but different shapes
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Correct answer: Port marks are red and starboard marks are green

Region A reverses the colors, so red marks the port side. The shapes keep the same meaning in both regions.

Source: US Code of Federal Regulations (eCFR), 33 CFR Part 62: United States Aids to Navigation System, § 62.25 Lateral marks

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Questions last reviewed: 18 October 2026