FENDT varioguide Operator's Manual page 123

Pivot
The circuit way line is created in the same manner
as the contour. The circular arc driven is used to
calculate the theoretical accuracy of the center of
the circle. If this is less than 10.00 m, the STOP
button will appear.
(E) START softkey
VarioGuide
438.020.070.012
Fig. 83
Fig. 84
7. Start-up
123