Question 162Navigation General

70% to pass

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?

Diagram for USCG Navigation General: In the North Sea area, you sight a buoy showing an uninterrupted quick-flashing...
A A
B B
C C
D D
AI Explanation

The correct answer is B. Under the IALA Buoyage system, a buoy showing an uninterrupted quick-flashing white light in the North Sea area would be fitted with topmark B, which is a double cone with the points upward. This configuration indicates that the buoy is marking the port (left) side of a channel when entering from the sea. The other topmark options are incorrect because A is a single cone point upward (starboard side), C is a single cone point downward (preferred channel), and D is a double cone with the points downward (starboard side).

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Official Resources
USCG Navigation Rules (COLREGS) 33 CFR Navigation Rules USCG National Maritime Center
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