Chart Navigation & Plotting · Compass — TVMDC Application
Your true course is 130°T. Variation is 10°E and deviation on that heading is 2°W. What is the compass course to steer?
- A118°C
- B122°C✓ Correct
- C142°C
- D138°C
Explanation
Working True→Compass, apply easterly errors by subtracting: 130° − 10°E (var) = 120° magnetic; then − (−2°W) i.e. + 2° for westerly deviation = 122°C. (Going down the TVMDC ladder, add westerly and subtract easterly.)
Authority: Bowditch (Pub. No. 9), compass conversion (TVMDC)
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