USCG Exam PracticePassing distance and CPA from chart plot
Bowditch Ch. 7 §703 describes the 'doubling-the-angle' technique for obtaining a running fix. Which statement correctly describes the geometric relationship that makes this technique valid?
- A. The distance run between the two bearings equals twice 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 distance run between the two bearings equals the distance to the object at the first bearing
- D. The distance to the object at the second bearing equals twice the distance run between the two bearings
Why B is correct
Bowditch Ch. 7 §703 states explicitly that in the doubling-the-angle technique, the distance run between the two bearings equals the distance to the object at the second bearing. This is the defining geometric property of the method and is the basis for its use in piloting.
Cited:Bowditch Ch. 7 §703