After my initial AC3.4-rc4 build skyrocketed and crashed, new parts arrived and the S500 build is again finished. Now, I am running AC3.4-rc5 on my AUAV.co PixRacer and also using MP 1.3.41 build 1.1.6110.31287 (the latest) and noticed that although the COMPASS_EXTERNAL=1 is saved successfully, upon rebooting the board (both via USB and battery), is is again COMPASS_EXTERNAL=0.
The GPS used is a uBlox Neo m8n with built-in compass (ROTATION_NONE) which works fine acquiring constantly 3D fix outside.
I am attaching my saved configuration for your reference. All pre-arm checks are off because the aircraft is not ready to fly as I am tuning things.
Many thanks in advance.S500_AC34rc5.param (10.0 KB)