I had a similar question: What is the GPS source for Skydemon when using SafeSky
I now understand that SS is always the GPS source for SD althogh that option is switched off in SS.
But my main worry is not answered in this thread yet:
What will happen with the GPS data source from SS when SS looses the internet connection and can not provide traffic data via the GDL90 interface, would Skydemon then also loose its GPS source?