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As I recall, Galileo (the European system) is designed to be interoperable w/ GPS.
More to the point, without direct knowledge, I can guess that satellites are hardened against EMP.
The problem is that EMP hardening is expensive. Ergo, a lot of stuff *not* spacebound is -not- hardened.
Launching to the altitude of the GPS satellites, also, is expensive (regardless of payload); The number of countries that can independently launch anything is small: 7 of them, and two (the UK and France) now combine their space operations under the ESA.
In short: Worry not about the satellites. They're safe from EMP. Worry about all the equipment that uses them. They're not.
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