Leica Geosystems Leica mojoXact Plus - Manual (Page 104)

104 Guidance, Leica mojoXact Plus
7.6 Nudge
Description The GPS system in the mojoXact Plus is subject to drift over time, more so if the
GL1DE
TM
Only correction source is used. If the mojoXact Plus is used for extended
periods of time, then it may be necessary to adjust the GPS position using the nudge
feature. Nudge can use the wayline as a reference to adjust the GPS position or it
can use the vehicle’s current position as a reference. This can be thought of as
moving the vehicle back to the wayline, or moving all data on the screen (waylines)
to the position of the vehicle, respectively.
Nudge on a straight line (AB Parallel or A+ Heading wayline) shifts the position of the
line parallel to either side. Nudge on a pivot wayline decreases or increases the radius
of the currently guidable line. Nudge can be used to reposition the line if the base
station has been moved or if the system is used without a reference source, that is,
GL1DE
TM
Only.
Auto-steer can be engaged while the nudge operation is performed. If this is the case
the steering will respond immediately to the changes that result from the nudge
operation.
Nudge settings are not saved with the wayline. This means that if a wayline that has
been nudged is reloaded at a later time, the line will be in the position where it was
created (providing that a precision correction source is used).

Nudge can only correct for drift in a single direction which is perpendicular to the
wayline. To accurately correct for drift it may be necessary to nudge on a wayline
heading north/south as well as east/west.
Nudge, step-by-
step To nudge the GPS position, carry out the following steps:
1. Position the vehicle on the tracks of an already driven wayline.

If the GPS position has drifted since this wayline was driven the universal
terminal will display an offset from the wayline on the screen.
2. On the main navigation screen, select the Nudge button.
The Nudge screen appears.