You depart LAT 25°54'N, LONG 9°38'E and steam 592 miles on course 270°. What is the longitude of arrival?
Official USCG Answer & Rule Citation
Correct Answer: Option C — 1°20'W
Departure longitude 9°38'E, course 270° (due West). Departure latitude 25°54'N. Change in longitude = 592 / cos(25.9°) = 658' = 10°58'. Moving west from 9°38'E, subtract 9°38' to reach 0° longitude, then subtract the remaining 1°20' to arrive at 1°20'W.
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