Autopilot system 8 Vehicle guidance setup
Tire track offset method for roll offset
Note – Use a highly repeatable GPS correction mode for roll correction. For best results, use a RTK mode or
OmniSTAR HP signal that has been converged for at least twenty minutes. If you do a roll calibration with less
accurate GPS correction modes, repeat the measurements at least four times to ensure a more consistent
result.
1. Remove any implement from the vehicle.
2. Drive the tractor to a relatively flat field where tire impressions are visible and where you can
complete passes of at least 400 m (1320ft) in length.
3. Reset the roll offset value to 0 (zero).
4. Create an AB Line.
5. Create a clean set of tire tracks in the field. To do this, start a new pass away from the area
where the AB Line was created. When the system is stable, engage automatic steering mode
and allow the Autopilot system to complete the pass.
6. At the end of the pass, turn the tractor around to return along the same pass from the
opposite direction.
7. Engage automated steering mode and allow the system to complete the pass.
8. In the middle of the return pass, stop the tractor and confirm that the current position is
directly on the AB Line. This ensures there is no cross track error.
9. Park the tractor and exit the cab. Evaluate the tire track pattern between the first and return
paths.
10.
Measure the difference between the track passes and record the distance. Also note whether
the return pass is to the left or the right of the original pass. Record the results.
Note – The offset should be consistently to the left or right.
11. Repeat Step 5 through Step 10 two more times, for a total of three test runs.
Test Run Offset distance Offset direction
1
2
3
Total =
Total / 3 (average offset value) =
182 FM-1000 Integrated Display User Guide Version 9.25, Revision B
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