Boating Coach US
Aids to navigationQuestion 239 of 352

What does an orange diamond with a cross inside it mean?

  1. Danger is in the area
  2. A speed limit is in effect
  3. Vessels may not enter the marked area
  4. Directions are shown on the sign
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Correct answer: Vessels may not enter the marked area

The cross inside the diamond means the area is closed to vessels. A plain diamond shows danger.

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