If you are approaching a vessel from directly behind at night, which light would you observe?

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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

If you are approaching a vessel from directly behind at night, which light would you observe?

Explanation:
The key idea is that navigation lights are laid out to show a vessel’s orientation. When you approach another vessel from directly behind, your view is along its stern axis. The light that should be visible in that orientation is the stern light, a white light located at the stern and visible to observers behind the vessel (covering the rear arc, about 135 degrees). The masthead light is forward-facing, and the sidelights are on the sides, so they aren’t the lights you’d see when looking directly from behind. A white light forward would be seen from in front, not from behind.

The key idea is that navigation lights are laid out to show a vessel’s orientation. When you approach another vessel from directly behind, your view is along its stern axis. The light that should be visible in that orientation is the stern light, a white light located at the stern and visible to observers behind the vessel (covering the rear arc, about 135 degrees). The masthead light is forward-facing, and the sidelights are on the sides, so they aren’t the lights you’d see when looking directly from behind. A white light forward would be seen from in front, not from behind.

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