The great circle distance from LAT 25°50'N, LONG 77°00'W to LAT 35°56'N, LONG 06°15'W is 3616 miles, and the initial course is 061.7°T. Determine the latitude of the vertex.
Official USCG Answer & Rule Citation
Correct Answer: Option D — 37°34.9'N
Great circle vertex latitude is calculated using navigational spherical trigonometry formulas from Bowditch, utilizing the initial course angle and departure position coordinates to solve the right-angled navigational triangle.
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