Buoys and markersQuestion 489 of 566

Which special buoys may show a yellow X topmark?

  1. Keep out, diving and swimming buoys
  2. Information, control and hazard buoys
  3. Cautionary, scientific and anchorage buoys
  4. Mooring and fairway buoys
Show answer

Correct answer: Cautionary, scientific and anchorage buoys

The guide lists these three kinds for the yellow X topmark.

Source: Safe Boating Guide (TP 511E, 2026), Cardinal Buoys and Special Buoys, page 65

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Questions last reviewed: 18 October 2026