You depart LAT 25°54'N, LONG 9°38'E and steam 592 miles on course 270°. What is the longitude of arrival?

Correct Answer: Option C — 1°20'W

Departure along a parallel is converted to difference in longitude using departure divided by the cosine of the latitude multiplied by 60. Steaming due west (270°) for 592 miles at latitude 25°54'N produces a change of 1°20'W, resulting in arrival longitude 1°20'W.