A vessel at LAT 21°32'N, LONG 160°30'W, heads for a destination at LAT 30°00'N, LONG 150°00'E. Determine the true course and distance by Mercator sailing.
Official USCG Answer & Rule Citation
Correct Answer: Option D — 281°T, 2733 miles
Mercator sailing formulas determine the rhumb line course and distance between two points. By calculating the difference in latitude and the difference in meridional parts, the course angle is found via the arctangent of (DLong / DMP). The resulting 281°T and 2733 miles align with standard navigational computations.
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