EASA NAV(A)intermediate
For the same data—TC 183°, WCA +011°, MH 198°, CH 200°—what are variation and deviation?
Answer
VAR 004°W, DEV −002°
Explanation
The magnetic-versus-true difference is 4° west according to the keyed convention. Compass heading is 2° greater than magnetic heading, which corresponds to the stated deviation of −002° under this sign convention. **Key takeaway:** Deviation is obtained from magnetic and compass references, not from true north. **Glossary:** **DEV**: Compass deviation; **VAR**: Magnetic variation.
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