I wonder if anyone has noticed that the PC version of Skydemon reads a different altitude to the Android version when using SkyEcho 2 or other GDL90 data source? I use the PC version of Skydemon when connecting to Flight Simulator 2020, and it also shows the altitude discrepancy. Using SkyEcho at home, the PC version reads 180ft, and the Android version reads 30ft.

I suspect that the Android version is correct and is applying an ellipsoid to geoid correction that the PC version is not. If so, it would be interesting to know what that correction is.

Does anyone have any pearls of wisdom?

Cheers!

Colin Martin