It's my belief that there is nothing wrong with the GPS receiver. I too have a GNS1000 which works without problem if I read the raw NMEA0813 data from it on a Mac, but periodically my iPad refuses to get the data stream - or more specifically - the 'GPS App' doesn't get anything from the underlying iOS navigation subsystem. I think it's an iOS problem, but the problem for you is that SkyDemon is the application people see as the problem. It doesn't help that SD silently 'goes red', it could be a better approach to be more visual with the user when an extended loss of GPS communication occurs - you are the victim in this case, not the cause. It also doesn't help when we have to ask repeatedly what the blue triangle means in the ALT display - and still don't get a complete answer - and the documentation is still unchanged..
Anyway, moaning over - let's try and help Terry get his unit working.
- Firstly, turn off the WiFi on the iPad. The iPad will supplement positional information from WiFi spots if finds one. Turn it off since this can give the impression of having some positional awareness when in fact none is available from the GPS.
- Close down all running Apps - double-click the large button at the bottom of the iPad, tap and hold one of the running Apps shown in the bottom of the display, then tap the red '-' sign on each one until there's none left
- Reset privacy : Settings -> General -> Reset -> Reset Location and Privacy (and confirm reset)
- Reset network : Settings -> General -> Reset Network Settings (and confirm reset)
- iPad will reboot
- When iPad is ready, enable Bluetooth and pair with your GNS1000, preferably outside, so that blue LED comes on and green LED stays on (both solid, not flashing)
- Now start the 'GPS' App (not SkyDemon!) - it will ask you to allow location access to the App - confirm yes. This is vital !
- Watch what the GPS App display tells you. It should start showing GPS data immediately.
- Set 'Desired Accuracy' to Best and 'Distance Filter' to None.
You should see the red dot in the middle of the app flash reliably once per second. You can try pressing 'Force Update' but if that doesn't kick it into life, there's still something wrong.
Assuming you are all good up to this point, start SkyDemon and 'Go Flying' - you should get a blue or green ALT triangle if your vertical GPS accuracy reported better than 15m or so.
Some points to note about the 'GPS App'. Course and Speed are shown only when moving, so if you are stationary, it will be '-'. Speed will indicate 0mph if you are stationary WITH good GPS data, or '-' if GPS data is missing. Altitude and Location accuracy can show accuracies obtained from a local WiFi signal - not necesarily GPS - again, TURN OFF WIFI to be sure you are using GPS !
In my experience, unless the red dot flashes once per second, AND you get a changing speed and course indication in the GPS App when moving, the iPads positional awareness is unreliable and SkyDemon along with any other navigation app will not work.
Hope this helps - let me know.