USCG Exam PracticePlotting with variation and deviation (T-V-M-D-C)
A helmsman steers 270°C. The deviation for that heading is 4°E and the local variation is 9°W. What is the true course?
- ✓ 265°TCorrect
- B. 257°T
- C. 275°T
- D. 283°T
Why A is correct
Correcting from compass toward true (add east, subtract west): 270°C plus 4°E deviation = 274°M; 274°M minus 9°W variation = 265°T. The mnemonic 'correcting, add east' applies at each step.
Cited:Bowditch Ch. 6 §602