FENDT varioguide Operator's Manual page 155

Designation
Roll
Waypoint
Xtrack
Centimeter accuracy
(CM)
VarioGuide
438.020.070.012
Description
When one side of the tractor lifts or lowers relative to the other side due to
changes in the terrain.
One of the two reference points in the field used to define a virtual straight
line: the wayline.
The right-angled distance between the current tractor position and the wayline
(cross track).
Accuracy of up to +/- 2 centimeters, ensured by DGPS options such as RT2.
9. Appendix
155