Topcon AGA5495, Operator'S Manual, Page: 123 / 144

Chapter 15 – Nudge Menu
105
1. Drive the vehicle to an identifiable location within the field (for
example, next to a gate, the corner of the field or in the previous
year’s wheel tracks).
2. Use the GPS Drift Options window to position the vehicle on the
map relative to these fixed landmarks.
In order to do this more accurately and quickly, you may want to set a
flag point at a marked location on the field. Then each time you return
to the field, position the vehicle at that marked location, locate the flag
point on the map and select it. This will open a window with the option
for 'GPS Drift Correction'. Selecting that option will move the vehicle
to the location of the flag point.
The GPS drift compensation that is applied is remembered when the
console is restarted. However, this compensation may no longer be
accurate if conditions have changed. An alarm will be shown shortly
after the system starts that will advise the operator that GPS drift
compensation is in effect. The operator must then decide if they want to
continue using this compensation factor, clear it back to zero or
perform the GPS drift compensation procedure again to get a more
accurate result for that session.
15.2.2. High accuracy correction sources
GPS drift compensation should not be necessary with higher accuracy
correction sources (for example, RTK). If a high accuracy source is
being used, the GPS drift compensation should be reset back to zero in
the GPS Drift Options window.