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http://www.nextpreppers.com/2019/03/07/in-an-emp-attack-or-a-major-power-grid-failure-gps-systems-would-be-out-of-service-along-with-cell-phones-and-other-electronic-communication-systems-8-tools-for-underground-city-navigation/
In An EMP Attack, Or A Major Power Grid Failure, GPS Systems Would be Out Of Service Along With Cell Phones And Other Electronic Communication Systems: 8 Tools For Underground City Navigation