The initial great circle course angle between LAT 23°00'S, LONG 42°00'W and LAT 34°00'S, LONG 18°00'E is 063.8°. What is the true course?
Official USCG Answer & Rule Citation
Correct Answer: Option C — 116.2°T
Per Bowditch navigation principles, the true course is derived from the quadrant and course angle. For a southerly departure heading eastward, true course equals 180° minus the easterly course angle (180.0° - 063.8° = 116.2°T), conforming to standard spherical trigonometry conversion rules.
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