GCS is used for telemetry and data logs visualization, autopilot setup, waypoint settings and also for simulation and extensive testing after introducing changes to the autopilot code (GCS sends simulated GPS and attitude data to the autopilot and reacts to received servo signals) . It is still a bit rough yet functional.
Sarel, I developed this GCS specifically for my UBW based autopilot and it's pretty unusable with anything else. It's quite possible that at some point in time I release the autopilot firmware and gcs binaries to the public.
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Anyway I hope you do soon.
Rgrds
Rgrds
Sarel