You depart LAT 52°01'N, LONG 176°09'E, for LAT 52°01'N, LONG 178°46'W. What are the course and distance by parallel sailing?
Official USCG Answer & Rule Citation
Correct Answer: Option D — 090°T, 188 miles
Parallel sailing principles dictate that constant-latitude tracks follow true east-west headings. Crossing the 180th meridian requires summing $D\text{Lo}$ eastward from $176^\circ09'\text{E}$ to $178^\circ46'\text{W}$, yielding a course of $090^\circ\text{T}$ and a distance of $188$ miles.
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