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Aids to navigationQuestion 265 of 352

On the Western Rivers marking system, what is true about buoys?

  1. They always have even numbers
  2. They always have odd numbers
  3. They carry mile marks
  4. They are not numbered
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Correct answer: They are not numbered

This river system does not number its buoys. The standard odd and even rule does not apply there.

Source: US Code of Federal Regulations (eCFR), 33 CFR Part 62: United States Aids to Navigation System, § 62.51 Western Rivers Marking System

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Questions last reviewed: 18 October 2026