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Mariners Learning Practice Test

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The sternlight shall be positioned such that it will show from dead astern to how many degrees on each side of the stern of the vessel?
Correct Answer:
67.5°
Explanation:
The sternlight identifies the rear of the vessel and is designed to cover a specific arc behind it. It must be visible from directly astern and extend 67.5 degrees to each side of the stern, giving a total behind-arc of 135 degrees. This arrangement ensures other vessels behind you can reliably see the sternlight without the light extending too far forward and causing confusion with the side or forward lights. So, the correct degree on each side is 67.5°.

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