Question 156Navigation General
70% to passIn 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?
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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