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Aids to navigationQuestion 243 of 352

Which numbers do red aids to navigation carry?

  1. Odd numbers
  2. Any number in order
  3. No numbers
  4. Even numbers
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Correct answer: Even numbers

Red marks have even numbers and green marks have odd numbers.

Source: US Code of Federal Regulations (eCFR), 33 CFR Part 62: United States Aids to Navigation System, § 62.43 Numbers and letters

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Questions last reviewed: 18 October 2026