Question 156Navigation General

70% to pass

In the North Sea area, you sight a buoy showing a quick white light with 9 flashes every 15 seconds. Which of the four topmarks shown in illustration D030NG below would be fitted to the buoy?

Diagram for USCG Navigation General: In the North Sea area, you sight a buoy showing a quick white light with 9...
A A
B B
C C
D D
AI Explanation

The correct answer is C. The quick white light with 9 flashes every 15 seconds indicates that the buoy is a special purpose buoy. According to the IALA Buoyage System, a special purpose buoy is marked with a topmark consisting of two black spheres (choice C). The other options are incorrect because A and B represent navigation buoys, while D represents a wreck marking buoy, none of which are appropriate for a special purpose buoy in the North Sea area.

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