I have a new iPad Air with only the wifi capability, no cellular. Have not had a chance to fly with it, but in the car I find that I'm only getting a weak signal registered through iFly and only some data is being displayed properly, such as distance to waypoint and the plane icon moving in the correct direction, although pointing the wrong way. Is this because I'm on the ground? I've mounted the iPad high up on the windshield, so it should have a clear signal. IFly on my iPhone works perfectly, of course I know it's getting help from cell towers.
Do I need a supplemental GPS for the iPad? Is there so wrong with my iPad? Even when I step outside the car, out in the open, iFly reports only two green bars out of four for signal strength.
Also, how does iFly / iPad work with a plane's installed ADSB?