[Yo-Yo]

I thought the Earth's magnetic North is migrating yearly, and that we're overdue for a magnetic "flip" of the poles?

Before my day in the Air Force, and way before GPS, B-52 bombers and ICBM missiles were equipped with Startrackers that could lock onto and track a star, even in daytime. The obvious problem, however, is cloud cover...

[Arones]

The BUFF Astro Tracker was very difficult to maintain. Tube, mechanical computers and lost of components in the wheel well that were sprayed with the elements.

[Robert A Cook PE]

Yes, the north magnetic is crossing the line between the geographic north pole and the international date line this summer. Weakening also. The south magnetic pole? Little change!