EASA NAV(A)intermediate
What could cause runway indicators to change, for example from runway 06 to runway 07?
Answer
A change in magnetic variation at the runway location
Explanation
Runway designators are based on rounded magnetic direction. A change in **magnetic variation** can alter the magnetic bearing and eventually require a designator update. Deviation is aircraft-compass error, not the basis of runway numbering. **Key takeaway:** Runway numbers reflect magnetic direction. **Glossary:** Runway designator: number based on runway magnetic direction rounded to the nearest ten degrees.
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