You depart LAT 50°06.0'N, LONG 153°06.0'E and steam 879 miles on course 090°. What is the LONG of arrival?

Correct Answer: Option A — 175°56.0'E

Departure at 50°06.0'N, 153°06.0'E on course 090°T for 879 miles requires calculating departure (p) = d * cos(Lat). With p = 563.0'E, the change in longitude (DLo) is p / cos(Lat). Adding 879 miles of easting to the starting longitude yields 175°56.0'E.