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 A — 44°49'W

Parallel sailing assumes constant latitude where departure equals distance times the cosine of the latitude. Solving for difference in longitude via Bowditch methods, $\Delta \lambda = \text{Departure} / \cos(\text{Lat})$, updates the initial meridian to 44°49'W.