Question 523 Rules of the Road

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BOTH INTERNATIONAL & INLAND The stern light shall be positioned such that it will show from dead astern to how many degrees on each side of the stern of the vessel?

A 22.5°
B 67.5°
C 112.5°
D 135.0°
AI Explanation

The correct answer is B) 67.5°. According to the International Regulations for Preventing Collisions at Sea (COLREGS) and the Inland Navigation Rules, the stern light must show from dead astern to 67.5° on each side of the vessel. This ensures that the stern light is visible from a wide arc around the stern, allowing other vessels to determine the orientation of the ship. The other options are incorrect because A) 22.5° is too narrow, C) 112.5° is too wide, and D) 135.0° is also too wide for the required visibility of the stern light.

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