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

After plotting a course line on a chart, the mariner transfers it to the nearest compass rose using parallel rulers to read which value?

  1. A. The compass course corrected for deviation
  2. B. The magnetic course from the inner ring of the compass rose
  3. ✓ The true course from the outer ring of the compass roseCorrect
  4. D. The bearing to the nearest aid to navigation

Why C is correct

Parallel rulers are walked from the plotted course line to the compass rose, and the true course is read where the ruler crosses the outer (true) ring. Conversion to magnetic or compass course is a separate calculation using variation and deviation.

Cited:Bowditch Ch. 4 §406

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After plotting a course line on a chart, the mariner transfers it t… — USCG Exam Practice · CaptainsGround