I think you have a faulty SE2. I have never seen behaviour like that with mine.

Not original OP, just ran into a very strange error taking off today from Cannes.  I suspect that either my SE2 or my SafeSky decided to go crazy, and switching to internal GPS on the ipad brought things back to normal.  This was not a Skydemon issue, but it would be interesting to know if there would be a way to avoid it trying to display bad info. 

On both images, my actual position was at the far left part of the blue track.  The display was jumping back and forth very quickly, so distracting that I had to do the "stop navigating" and the "go flying" again.  I tried rebooting the SE2, didn't help.  Using the internal GPS worked fine.  Later, I stopped the SafeSky and connected Skydemon directly to the SE2 and it worked fine.  I didn't take time to troubleshoot further as I was busy flying.

No action needed, just thought this was interesting.  

MC

FYI, I have used my SE2 now for about 2 years and have never experienced an issue like you describe. 

Are you using your SE2 in a pressurised cabin?

Tony

However, your handheld device will use its inbuilt GPS receiver (or an external GPS receiver linked to it via BlueTooth) as GPS source for any other applications that need GPS coordinates.