Question 1897Navigation General

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A great circle crosses the equator at 17°W. It will also cross the equator at what other longitude?

A 173°W
B 163°E
C 117°W
D 17°E
AI Explanation

The correct answer is B) 163°E. A great circle is the shortest distance between any two points on the Earth's surface, and it always crosses the equator at two points that are 180 degrees apart in longitude. Since the given great circle crosses the equator at 17°W, the other point where it crosses the equator must be 180 degrees away, which is 163°E. The other options are incorrect because: A) 173°W is not 180 degrees away from 17°W. C) 117°W is not 180 degrees away from 17°W. D) 17°E is not 180 degrees away from 17°W.

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