The vertex of a great circle track is in LONG 109°E. An eastbound vessel would cross the equator in LONG __________.
Official USCG Answer & Rule Citation
Correct Answer: Option B — 161°W
The vertex and the equatorial crossing of a great circle are separated by 90 degrees of longitude. An eastbound vessel passing an 109°E vertex crosses the equator 90° further east, landing at 161°W after crossing the 180th meridian.
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