In the North Sea area, you sight a buoy showing an uninterrupted quick-flashing white light. Which of the four topmarks shown in illustration D031NG below will this buoy be fitted with under the IALA Buoyage system?
Official USCG Answer & Rule Citation
Correct Answer: Option B — B
An uninterrupted quick-flashing light in the IALA system indicates a South Cardinal mark. The corresponding topmark for a South Cardinal buoy consists of two cones pointing downward, apex to apex, which serves as a visual aid to distinguish it from other cardinal marks in the system.
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