The sternlight must show from dead astern to how many degrees on each side?

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Study for the Maritime Navigation Rules and Vessel Responsibilities Exam. Study with multiple choice questions including hints and explanations. Prepare effectively for your exam with us!

Multiple Choice

The sternlight must show from dead astern to how many degrees on each side?

Explanation:
The sternlight is placed at the stern and must be visible to vessels behind you over a specific aft sector. It is required to show over a 135-degree arc centered on dead astern, which means 67.5 degrees to each side of dead astern. In other words, the light is visible from 112.5 degrees to 247.5 degrees relative to the vessel’s forward direction. This 67.5-degree spread on each side ensures the rear signal is clear without projecting too far forward. The other numbers don’t fit because they would not match the sternlight’s defined aft-only sector or would describe different light coverage.

The sternlight is placed at the stern and must be visible to vessels behind you over a specific aft sector. It is required to show over a 135-degree arc centered on dead astern, which means 67.5 degrees to each side of dead astern. In other words, the light is visible from 112.5 degrees to 247.5 degrees relative to the vessel’s forward direction. This 67.5-degree spread on each side ensures the rear signal is clear without projecting too far forward. The other numbers don’t fit because they would not match the sternlight’s defined aft-only sector or would describe different light coverage.

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