Stuff like this: https://en.wikipedia.org/wiki/March_1989_geomagnetic_storm https://en.wikipedia.org/wiki/March_1989_geomagnetic_storm or worse - e.g. EM waves

Stuff like this: https://en.wikipedia.org/wiki/March_1989_geomagnetic_storm https://en.wikipedia.org/wiki/March_1989_geomagnetic_storm or worse - e.g. EM waves knocking out satellites - having the GPS system vanish would have quite severe impact.