Navigation Problems USCG Question #1733 (Set 52)

Determine the great circle distance and initial course from LAT 35°08.0'S, LONG 19°26.0'E to LAT 33°16.0'S, LONG 115°36.0'E.

Official USCG Answer & Rule Citation

Correct Answer: Option C — 4559 miles, 121°T

Applying the spherical law of cosines for distance and the sine rule for initial course, the great circle distance between these coordinates is 4559 nautical miles. The initial bearing is calculated as 121°T. These formulas are standard in Bowditch for determining the shortest path between two points on the globe.

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