I have an iPad4 (no internal GPS) with the GNS1000 external GPS.

Forget all the above, it seems to be pot luck now whether the gps signal stays connected, if you can get through the first 20 seconds your'e ok otherwise no chance.

I think it's back to the cheap chinese device for now.

Which ios Versions do you use ? when you get the gps problems ? 6.1.1 / 6.1.2 :-)