Your navigation system just got a critical update, one that happens periodically because Earth’s magnetic north pole keeps moving. Here’s what to know.

Earth’s magnetic north is not static. Like an anchorless buoy pushed by ocean waves, the magnetic field is constantly on the move as liquid iron sloshes around in the planet’s outer core.

In the days since GPS was invented, many of us have lost ... Magnetic declination is the angle between magnetic north and true north, and it’s also one of the primary places where beginner ...

To preserve the accuracy of GPS measurements ... also known as the true North Pole, is fixed. By comparison, the magnetic north pole is the northernmost convergence point in Earth’s magnetic ...