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

A vessel's compass course is 180°C. Deviation is 6°W and variation is 8°W. What is the true course?

  1. ✓ 166°TCorrect
  2. B. 194°T
  3. C. 174°T
  4. D. 186°T

Why A is correct

Correcting compass to true, subtract westerly errors. Apply deviation first: 180 - 6 = 174°M. Then apply variation: 174 - 8 = 166°T. Both errors are westerly, so both are subtracted when correcting toward true.

Cited:Bowditch Ch. 6 §602

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A vessel's compass course is 180°C. Deviation is 6°W and variation… — USCG Exam Practice · CaptainsGround