You depart LAT 38°12'S, LONG 12°06'W and steam 1543 miles on course 270°. What is the Longitude of arrival?

Correct Answer: Option B — 44°49'W

Departure longitude 12°06'W, course 270° (due West). Departure latitude 38°12'S. Departure (p) = 1543 miles. Change in longitude = Departure / cos(Lat) = 1543 / cos(38.2°) = 1963' = 32°43'. Adding 32°43' to 12°06'W results in 44°49'W, as the vessel moves further west.