In the Canadian AIP, the Northern Domestic Airspace (low level) runs roughly from about 60 deg N - the Northern & Arctic Control High Level areas share similar boundaries. Within this area all bearings, courses &c are supposed to be in deg True and a/c are obliged to used a non magnetic means of finding North. North of 60 will produce significant errors if relying on Magnetic compass - I think this effect is greater on the East coast.
I believe the current Magnetic North Pole is located on Baffin Island.
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