UAV Outback challenge improvements from Team Swiss Fang

This is the collection of improvements done by the swiss team at the outback challenge. Needs validation / polishing.

@thomasgubler A merge with master would be great, I got confused by the (only two!) conflicts.
We will likely want to offer here to keep the default as on the GPS and to switch it completely off, or region-specific presets (americas, asia, europe, africa, oceania).