USCG Exam PracticePlotting with variation and deviation (T-V-M-D-C)
A vessel's true course is 085°T. Variation is 10°W and deviation is 5°E. What is the compass course to steer?
- A. 080°C
- ✓ 090°CCorrect
- C. 070°C
- D. 100°C
Why B is correct
Using T-V-M-D-C and uncorrecting from true toward compass: add westerly variation (085 + 10 = 095°M), then subtract easterly deviation (095 - 5 = 090°C). When converting true to compass, add westerly errors and subtract easterly errors.
Cited:Bowditch Ch. 6 §602