Chart Navigation & Plotting · Compass Conversion — TVMDC
A compass course of 215° is steered with deviation 3°W and variation 6°E. The true course is:
- A218°✓ Correct
- B212°
- C224°
- D206°
Explanation
Correcting from compass to true: compass 215 − 3W deviation = magnetic 212; + 6E variation = true 218°. (When going compass→true, add easterly errors.)
Authority: Bowditch (Pub. No. 9); Dutton's Nautical Navigation
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