My iPad (non-GPS version) connects OK to the GNS 5870 GPS via Bluetooth.

I find the virtual radar disappears with no GPS fix.

Thanks, Cardinal.

I think my little aeroplane goes red when it loses the fix from the GNS5870. That said, the GNS keeps a much better lock in my cockpit than some other GPS devices I have.

Yes, I'm getting that now - I guess that's the answer.

Not sure what you mean by satellite position integrity checking. I only made one attempt calibration, which was to fly directly over a VOR (confirming it of course with the mark 1 eyeball) and I was pleased to see that the GNS also thought I was directly over the beacon. I also have checked that the GNS is also giving me the same information as my (confusingly similar;y named) Garmin GNS430 in the cockpit. It's pretty good and the groundspeeds are pretty much identical pretty much all the time between the two devices.

Planned and flew my first flight on the iPad with a GNS5870 and wow I love it!! Some comments are, I had the GNS5870 turned on first with the green light on and showing it had a valid fix, then opened SkyDemon, to find the aircraft was still red, I restarted skyDemon, but that didn't help, then had to restart the GNS which did fix the problem. So all good and off I set, not once did I lose the fix and all went well till I reached my destination, where I was on the ground for 5 hours. I turned the iPad off and left the aircraft, with the iPad and GNS still in it.

About an hour later I remembered I hadn't turned the GNS off, but then remembered that it should shut down automatically if it doesn't have a bluetooth connection. So I wasn't worried. On returning to the aircraft, I could see the blue light for blue tooth was still on (even though the iPad screen was blank and I presumed off) and the battery light was flashing advising I only had about 10 mins left (btw I had been using the GNS on the ground a bit hence it only lasting 5 hours) So lesson learnt, if you turn your iPad off, believe it or not the bluetooth stays on unless you actually go into settings and turn it off or you manually turn the GNS off. I'll be doing both to save battery on both devices.

Cheers Grant

You probably didn't actually turn your iPad off... I'm guessing you just put it to sleep - one press of the power button?