Question 1899Navigation General

The correct answer is D) 161°W. The vertex of a great circle track is the point where the great circle track crosses a meridian at its highest or lowest latitude. Since the vertex is at LONG 109°E, the great circle track would cross the equator at the opposite side of the earth, which is LONG 161°W. The other options are incorrect because: A) 19°W is not the opposite side of the earth from the vertex at 109°E. B) 161°E is not the opposite side of the earth from the vertex at 109°E. C) 19°E is not the opposite side of the earth from the vertex at 109°E.