Has anyone used either the Foreflight App or the Garmin Pilot app? How well do they work? do you loose the ability of the moving map when you lose a wifi signal? Living I idaho we have a lot of back country stripes, I worry that if using one if these apps to help navigate they wouldn't work very well due to not to many wifi towers out in the woods. Would It just be better to use a Garmin gps unit? What's the advice out their