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Put simply, this is where the orientation of the quadcopter is continuously recalibrated using the GPS course over ground data. This technique elegantly resolves two issues:
- Recovering from inaccurate GPS positional data (particularly at low ground speed) and
- Correcting the flight path attitude due to cross-wind.
Any lateral movement due to cross-wind will introduce an error to the calculated orientation, however this error actually turns the quadcopter into the cross-wind. Natural feedback from continuous calibration results in accurate directional flight to the next way-point.