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

A vessel steers a compass course of 270°C. Deviation is 3°W and variation is 7°E. What is the true course?

  1. ✓ 274°TCorrect
  2. B. 260°T
  3. C. 280°T
  4. D. 266°T

Why A is correct

Correcting from compass toward true, add easterly errors and subtract westerly errors. Add easterly variation (267 + 7 = 274°T) after first applying deviation: 270 - 3 (westerly deviation) = 267°M, then 267 + 7 (easterly variation) = 274°T.

Cited:Bowditch Ch. 6 §602

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A vessel steers a compass course of 270°C. Deviation is 3°W and var… — USCG Exam Practice · CaptainsGround