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USCG Exam PracticePlotting with variation and deviation (T-V-M-D-C)

After drawing a course line between two charted points, a mariner walks parallel rulers to the compass rose and reads the true course from which ring?

  1. A. The inner ring, which shows magnetic directions
  2. ✓ The outer ring, which shows true directionsCorrect
  3. C. Either ring, since both give the same value in most US waters
  4. D. The deviation card overlay printed adjacent to the rose

Why B is correct

The outer ring of the compass rose shows true directions referenced to true north; the inner ring shows magnetic directions. A true course is read where the parallel rulers cross the outer ring.

Cited:Bowditch Ch. 4 §406

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After drawing a course line between two charted points, a mariner w… — USCG Exam Practice · CaptainsGround