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Manual No. 016-0171-122 Rev. I 47
Initial Set Up and Navigation
Fore or Aft Offset
The fore/aft offset is the distance of the boom or implement in front or behind the GPS antenna.
Note: The fore/aft offset must be measured perpendicular to the boom or implement width. See Figure 1
below. Touch the More Info button to see the Boom System Setup Information (including the
relationship of the boom to the GPS antenna).
To set the fore/aft value:
1. Touch the current fore/aft value displayed on the Boom Setup screen.
2. Use the keypad to enter the measured fore/aft value in inches (U.S.) or centimeters (Metric).
3. If the boom or implement is behind the GPS antenna, enter a negative value for the fore/aft offset.
FIGURE 1. Example of the Fore/Aft Measurement
Left or Right Offset
The left/right offset is the distance from the GPS antenna to the center line of the boom or implement.
Note: The left/right offset must be measured parallel to the boom or implement width. See Figure 2
below.
To set the left/right value:
1. Touch the current left/right value displayed on the Boom Setup screen.
2. Use the keypad to enter the measured left/right value in inches (U.S.) or centimeters (Metric).
3. If the center line of the boom or implement is to the left of the GPS antenna, enter a negative value for the
left/right offset.
DGPS Antenna
Center of Boom/
Implement
Fore/Aft
Measurement
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