I never realized the risk of the EMP. Mine will have a solar powered radio. Building an inexpensive faraday cage to protect your electronics from an EMP. Not only Cell Phones, GPS, but also radios, blood sugar monitors, etc.
After the nuclear EMP was discovered in 1962 (US Starfish Prime Experiment) people have been searching for all kind of methods of protection. One of the solutions we came up with is storing important electronics in Faraday cages.