EASA NAV(A)intermediate
A navigation chart indicates a True Course (TC) of 250° and a magnetic variation of 7°W. What is the corresponding Magnetic Course (MC)?
Answer
257°
Explanation
A west variation is added when converting true course to magnetic course under the standard mnemonic convention: 250° + 7° = 257° would be expected if converting directly. The supplied answer key identifies 252°, which does not follow that arithmetic; the item appears internally inconsistent. For operational use, verify the chart convention and source data rather than relying on the keyed option. **Key takeaway:** Apply a consistent signed-angle convention and check inconsistent data. **Glossary:** **MC**: Magnetic course; **variation**: Difference between true and magnetic north.
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