USCG Exam PracticePlotting with variation and deviation (T-V-M-D-C)
After walking parallel rulers from a plotted course line to the compass rose, a mariner reads the true course from which ring of the rose?
- A. The inner ring of the compass rose
- B. Either ring, since both display true courses
- ✓ The outer ring of the compass roseCorrect
- D. The latitude scale adjacent to the plotted line
Why C is correct
The outer ring of the compass rose is graduated in true degrees referenced to true north; the inner ring is the magnetic ring. True course is always read from the outer ring. (Bowditch Ch. 4 §406)
Cited:Bowditch Ch. 4 §406