Our military has EMP protected storage areas and bunkers from nuclear EMP. The storage areas are, but the toys aren't, encased in a faraday cage, too much weight. And even if it were...
http://kyl.senate.gov/legis_center/s...030805_pry.pdf
Super Electromagnetic Pulse Weapons - Futurescience.com
A Faraday cage on equipment has to be grounded to something, and that's the circuitry, so you put enough voltage on that it will even damage what's inside.
By default anything with an antenna, be it a radio or GPS receiver, cannot be shielded by a Faraday cage. Put it inside and it no longer receives, duh.
If you can focus an EMP, with a directed energy weapon, you can easily get to 50,000 volts per meter. A nuclear blast simply radiates and dissipates in all directions.
If you were to wrap up a laptop with tinfoil, and then tie the tinfoil up in metal wire, double faraday cage, and throw it at a high voltage power line, it will still fry everything inside.