An aircraft passes position A 60°00’N, 120°00’W on route to position B 60°00’N, 140°30’W.
What is the great circle track on departure from A?
Rhumb line track from position A (60˚00’N, 120˚00’W) to B (60˚00’N, 140˚30’W) is 270˚
Difference between rhumb line track and true track at position A is conversion angle:
Conversion angle = Sin latitude x difference in longitude / 2 = Sin 60 x 20.5 / 2 = 8.88˚
As we are in Northern hemisphere and going west so we add conversion angle to rhumb line track.
True track at A = 270˚ + 9˚ = 279˚
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