A vessel steams 580 miles on course 083°T from LAT 13°12'N, LONG 71°12'W. What are the latitude and longitude of the point of arrival by mid-latitude sailing?

Correct Answer: Option B — LAT 14°23'N, LONG 61°19'W

Mid-latitude sailing formulas resolve the rhumb line triangle by using the mean latitude between departure and arrival to convert departure longitude into difference of longitude. Calculations using LAT 13°12'N and course 083°T over 580 miles yield LAT 14°23'N and LONG 61°19'W.