Its a change in magnetic variation (deviation is the discrepency in a magnetic compass due to its electromagnitic surroundings).
Happens all the time. It's only when the change exceeds certain tollerances that they change the runway numbers. And those tollerances all depend on when that particular airport was last numbered.
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Its a change in magnetic variation (deviation is the discrepency in a magnetic compass due to its electromagnitic surroundings). Happens all the time. It's only when the change exceeds certain tollerances that they change the runway numbers. And those tollerances all depend on when that particular airport was last numbered.