Question 161Navigation General

70% to pass

In the North Sea area, you sight a buoy with a quick light showing 3 flashes every 10 seconds. Which topmark in illustration D030NG below would be fitted to this buoy under the IALA Buoyage Systems?

Diagram for USCG Navigation General: In the North Sea area, you sight a buoy with a quick light showing 3 flashes...
A A
B B
C C
D D
AI Explanation

The correct answer is D. Under the IALA Buoyage System, a buoy with a quick light showing 3 flashes every 10 seconds would be fitted with a topmark consisting of three black spheres, as shown in illustration D030NG. This topmark configuration indicates that the buoy is marking a special feature or area, such as a wreck or a zone with specific navigational requirements. The other answer choices are incorrect because they depict different topmark configurations that do not match the lighting characteristics described in the question.

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