The vertex of a great circle track is long. 029° W. A westbound vessel will cross the equator in what longitude?
SOLUTION:
The rule in this kind of problem is +90° or -90° to the longitude. You might ask, when are we going to add or minus 90°? These are the instances:
+90° if:
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SOLUTION:
The rule in this kind of problem is +90° or -90° to the longitude. You might ask, when are we going to add or minus 90°? These are the instances:
+90° if:
- Longitude is west and the vessel is westbound
- Longitude is east and the vessel is eastbound
-90° if:
- Longitude is west and the vessel is eastbound
- Longitude is east and the vessel is westbound
So in this problem our longitude is 029° W and our direction is west, therefore, we have to add 90° to the longitude.
029° W + 90° = 119° W.
If answer is >180°:
360°- ANS and then change the sign of longitude.
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