Hemisphere GPS eDriveTC, User Manual

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Appendices
Contour Terraces -
Similar to rolling terrain, but may require the use of contour guidance
mode. Contour guidance mode uses a smoothing feature to gradually
reduce curve severity with every consecutive pass. Therefore, each pass
will have some amount of error at the transitions of each curve. In
addition, drawn implements do not track directly behind the tow vehicle
when navigating curves inherently reducing accuracy. When possible,
use straight mode guidance and work up and over mild terraces in high
accuracy situations.
Old Crop Rows -
Old rows can create non-uniform draft loads on an implement pulling it
and possibly the tow vehicle off line. Working against old rows at an
angle will improve the draft uniformity. In some cases, it may be
necessary to completely work down old rows in order to develop new,
very accurate rows.
Soil Conditions -
Very loose soil may require more steering effort and traction from the
guided vehicle. To improve accuracy, it may be necessary to add weight
over the steering wheels, use mechanical front wheel drive, and/or
differential lock. Irregular and tight soil conditions, such as those
encountered when working with old crop rows, can cause similar
conditions. To improve accuracy, it is critical to use stabilizing elements
on the implement and have the proper ballasting on the tow vehicle.
Consistent Accuracy and Increased Productivity
Special attention to the previous four main factors (GPS signal
accuracy, machine/vehicle control, implement tracking and field
conditions) affecting automated steering accuracy can help you achieve
consistent results that maximize productivity.