USCG Exam PracticePlot true course and distance between two charted points
When using the doubling-the-angle technique to determine distance off a charted object, which of the following statements is correct?
- A. The distance run between the two bearings equals the distance to the object at the first bearing
- ✓ The distance run between the two bearings equals the distance to the object at the second bearingCorrect
- C. The technique requires simultaneous bearings to two separate objects
- D. The technique is only valid when the current set is zero
Why B is correct
In the doubling-the-angle technique, two relative bearings are taken to a single object such that the second bearing is double the first. The distance run between the two observations equals the distance to the object at the time of the second bearing.
Cited:Bowditch Ch. 7 §703