6 īīVehicles Autopilot system calibration
Roll correction calibration
Roll correction compensates for minor variations in the placement of the navigation controller and
GNSS antenna.
Note ā If you use multiple GNSS technologies (īfor example, RTK and WAAS), then use the device
with the highest accuracy when calibrating roll correction. For best results, use RTK, RTX or
OmniSTAR HP with a signal that has been converged for at least 20 minutes. If you do a roll
calibration with less accurate correction, repeat the steps below at least four times for greater
accuracy.
Pre-calibration steps
1. Set up a vehicle and perform all calibrations preceding this one.
2. Read and understand the instructions provided below for the calibration procedure.
3. Remove any implement from the vehicle and drive it to a flat, smooth area where you can
complete passes of at least 400 ft (125 m) in length.
4. Create a field. See Add a field, 181.
Calibration steps
1. Select the vehicle and implement you want to work with.
(See Select a vehicle, 145 and Select an implement, 189 for detailed instructions.)
2.
Select a field and enter the Run screen.
(See Select a field, 182 and Preparing for operation, 234.)
3.
Create a new, straightīguidance line.
(See AB guidance line creation (Run screen), 251 or A+ guidance line creation (Run screen), 252.)
4.
Make sure the on-screen lightbar is displayed on the screen.
(See On-screen widgets, 286.)
5. Engage automatic steering on the line. Drive until the on-screen lightbar number is as close to
zero as possible, and then stop the vehicle.
6. Mark the vehicle's position:
a. Place the vehicle in park and exit the cab.
b.
Place a flag in the ground that will mark the vehicle's center line. Use the drawbar pin hole
or use another feature of the vehicle as a reference point.
On vehicles such as sprayers, swathers, or combines, determine a reference point in the
center of the vehicle to mark (preferably near to the reference location for the antenna
162 TMX-2050 Display User Guide Version 1.075, Revision C
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