USCG Exam PracticePlotting with variation and deviation (T-V-M-D-C)
A vessel must steer a true course of 132°T. Variation in the area is 14°E and the deviation card for the required magnetic heading shows 6°W. What compass course must the helmsman steer?
- ✓ 124°CCorrect
- B. 144°C
- C. 120°C
- D. 140°C
Why A is correct
Converting true to compass (uncorrecting): subtract easterly, add westerly. 132° − 14°E variation = 118° magnetic; 118° + 6°W deviation = 124°C. The helmsman steers 124°C.
Cited:Bowditch Ch. 6 §602