[Myrddin]

Airport runways are designated with the magnetic direction on the threshold. The movement has been significant enough to require updating and repainting the correct magnetic orientation on a few runways.

[sasquatch]

Looks like 5 deg near Monterey Ca since 1955.

[Robert A Cook PE]

The effect (of this movement of the North Magnetic Pole) depends on the latitude of the runway, but more important on the longitude of the runway.

Note too that the amount of the change on on far the runway is from the North Magnetic Pole: Properly, the plane’s (or ship’s)
Magnetic compass needle is aligning on the Magnetic field stretching from the South Magnetic Pole, across the Equatir, to the North Magnetic Pole. So, since the Sourh Magnetic Pole has near-zero movement, and the NorthvMagnetic Pile is moving in a straight line towards Russia’s Siberian coast, if your runway is in the Eastern Time Zone of the USA, there is no change at all!

If you are further north and east, say Norway or Murmansk Russia, the your Magnetic compass shows a massive swing of almost 20 degrees correction in only 50 years.

If you are further west and north, say the North coast of Alaska, your compass correction is opposite of Norway’s change, but also 20 to 30 degrees.

South of the equator, but at the same longitude as Alaska? Near zero change.