The rapid and inexorable shift of the magnetic north pole requires the early release of a new model of the Earth's magnetic field for military and civil navigation around the Arctic. The partial arrest of the federal government will delay the release of this model from January 15th until at least January 30th, despite the US military request for an update sooner than expected.
No one is sure why change has accelerated, nor why the field has increased in recent times, according to Nature .
The previous model of the magnetic field was released in 2015 and updates have been scheduled for 5 year intervals. However, the changes are massive enough for military and civil navigation ̵
This update has no effect on GPS receivers, which do not rely on the magnetic north pole. Instead, a receiver receives signals from multiple satellites for which the exact position in orbit is known and uses the trilateration (the intersection of their signals) to determine a position. However, satellite orbits are optimized for reception in the most populated parts of the world and other factors reduce GPS accuracy and reception in the Arctic.
The magnetic north pole has never been a fixed point, but that northern tip, towards which the compass magnets point by their nature, has accelerated its movement in the last 40 years by the movements recorded in the first decades. (The geographic north pole and the magnetic north pole have no particular relationship: the first is set by cartographers.)
First measured in 1831 in the Canadian Arctic, the pole moved slowly northward. In the 1990s, the change accelerated from around 10 miles per year to 30 miles per year. This has led to a total change of 600 miles in 150 years. Now he is in the Arctic Ocean and heads for Siberia.
The liquid core of the Earth contributes most to the magnetic field of the planet. As it moves and flows, the field changes throughout the world, as does the "top" that identifies the north pole.