The “Origin” is the location that the Ardupilot EKF (aka AHRS) uses for internal calculations. This location is normally set to the vehicle’s location soon after the GPS provides a good quality location. Once set the EKF origin cannot be moved.

In the latest FC version the quality Origin importance has been significantly reduced. It is primary used to find the closest site only and to support some data sources. A different algorithm to obtain the Origin has been employed as well. It should greatly reduce any previous Origin issues.