USCG Exam PracticeCompass variation and deviation; T-V-M-D-C
A vessel's compass reads 085°C. The deviation for that heading is 3°E and the local variation is 10°W. What is the true heading?
- ✓ 078°TCorrect
- B. 072°T
- C. 092°T
- D. 098°T
Why A is correct
Using T-V-M-D-C: Compass 085° + 3°E deviation = 088° Magnetic; 088° Magnetic – 10°W variation = 078° True. East errors are added and west errors are subtracted when converting toward true. This application of variation and deviation is required by 33 CFR §164.78(a)(5).
Cited:33 CFR §164.78