Question 640Rules of the Road90% to pass
BOTH INTERNATIONAL & INLAND You see a vessel displaying three lights in a vertical line. The highest and lowest lights are red and the middle light is white. She is also showing a white light at the stern, which is lower than the forward light. Which vessel could you be observing?
AI Explanation
The correct answer is D) a survey vessel.
The display of three vertical lights, with the highest and lowest being red and the middle being white, along with a white light at the stern lower than the forward light, is the navigation light configuration for a survey vessel according to the International and Inland Navigation Rules.
The other options are incorrect because:
A) A vessel not under command would display two red lights in a vertical line.
B) A pilot vessel with port side to you would display a single white light at the masthead.
C) A vessel aground would display an all-round white light instead of the specific light configuration described.
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