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An isogonal line joins points with equal compass deviation.
Answer
false
Explanation
An **isogonal** (or isogonic) line joins points with equal **magnetic variation**, not aircraft-specific compass deviation. Deviation is caused by magnetic influences within a particular aircraft and may depend on heading. **Key takeaway:** Charted isogonals represent variation. **Glossary:** **Deviation**: error between magnetic north and the aircraft compass indication.
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