Question 1736Navigation General

70% to pass

A ship is in longitude 54°00'W on a true course of 090°. The ship's clocks are on the proper time zone. At what longitude should the clocks be changed to maintain the proper zone time?

A 52°30'W
B 67°30'W
C 45°00'W
D 60°00'W
AI Explanation

The correct answer is A) 52°30'W. The reason this is the correct answer is that when a ship is sailing on a true course of 090° (east), it is crossing time zones that are 15 degrees apart. Since the ship's current position is at 54°00'W, it should change its clocks when it reaches 52°30'W, which is the next time zone boundary 15 degrees to the east. The other options are incorrect because B) 67°30'W is too far east, C) 45°00'W is too far west, and D) 60°00'W is also too far east of the ship's current position.

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