TeeJet Swath XL - Manual (Page 64)

Chapter 3 - Real-Time Guidance 3-16
Lightbar Setup
Swath XL
Software Version 3.00
Drive Sensitivity
The Lightbar Menu item, Drive Sensitivity, allows you to set the distance you would like a single light on the Swath
XL lightbar to represent. If a value of 1.5 feet is entered, then each light on the lightbar will be equal to 1.5 feet. This
allows you to quickly determine how far off the guideline you are. If the second light to the right of the “stacked” cen-
ter light is illuminated, then the vehicle is approximately three feet to the right of the guideline and you need to turn
the vehicle to the left to get back on line. Figure 3-18 shows the lightbar (Display Mode = Swath) with a X-track error
of 2.3 ft. When determining what value to enter into the menu field you must consider the accuracy of the GPS/DGPS
system you are using. Different DGPS sources provide different position accuracy. A good rule of thumb is to set the
drive sensitivity to a value slightly less than one half of the position accuracy of your DGPS receiver. E.G., with a
DGPS system that is accurate to with in 3 feet, set the Drive Sensitivity to a value between 1.2 and 1.5 feet.
To change the Drive Sensitivity value, highlight the Drive Sensitivity menu item and press . The Drive Sensitivity
dialog box appears. Enter the desired value using the arrow keys . Once the desired value is entered,
press to return to the Lightbar setup menu, see Figure 3-19.
Figure 3-18: Lightbar with X-Track Error
Figure 3-19: The Drive Sensitivity Menu Item