Boating Coach US
Aids to navigationQuestion 240 of 352

An orange circle on a white regulatory mark means what?

  1. Some operating limits apply in the marked area
  2. Vessels may not enter
  3. Danger is ahead
  4. A safe anchorage is near
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Correct answer: Some operating limits apply in the marked area

A circle tells you that operating limits apply in that area. Read the nearby signs for the details.

Source: US Code of Federal Regulations (eCFR), 33 CFR Part 62: United States Aids to Navigation System, § 62.33 Information and regulatory marks

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Questions last reviewed: 18 October 2026