Given the evidence about the ability to interfere with GPS communications, is it safe to assume that it would be reliable in the event of some kind of Nuclear Conflict?
https://comicbook.com/gaming/news/pokemon-go-russia-cyberwea...
I thought (but have no expertise or evidence) that a network of land based detectors could pick up detonations across most of the world. Or you could build your own device to unplug your electronics in the event of a detonation: