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by DarmokJalad1701 870 days ago
GPS availability for the tablet/phone is a nice-to-have and not absolutely necessary for using an EFB. Intentional GPS jamming by the military happens from time to time in many parts of the US (esp. Socal) and it doesn't prevent people from using EFBs.

Personally, I fly with two EFB apps on my ipad and a backup on a separate device. The avionics in the airplane is probably a lot more robust than either device as well.