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Problem
You are on a great circle track departing from 25°30.0'N, 077°00.0'W and your initial course is 061.7°T.
The position of the vertex is 37°20.0'N, 025°45.0'W. There is a floating pub at the vertex. If you leave at
0800, April 3 and travel at 20 knots, when will you be seated with a drink in hand?
How to Solve:
-First establish what you need to know and what you do already know from the information provided.
-Second, solve for what you don't know. In this case, we do not yet know DLo, so we will solve by subtracting λv from λ1.
-Lastly, now that you only have one unsolved variable, solve for your Dv and ETA using the appropriate equations
(see right).
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