USCG Exam PracticePlot true course and distance between two charted points
After drawing a straight line between two charted points, a navigator uses parallel rulers to transfer the line to the compass rose. The true course is read from which ring of the compass rose?
- A. The inner (magnetic) ring
- ✓ The outer (true) ringCorrect
- C. Either ring, since both give the same value
- D. The variation scale printed between the two rings
Why B is correct
The true course is read where the parallel rulers cross the outer (true) ring of the compass rose. The inner ring gives magnetic course, which is a different value. (Bowditch Ch. 4 §406)
Cited:Bowditch Ch. 4 §406