Spectra Precision Survey Pro v4.5 Ranger User Manual - Manual (Page 233)

GPS Coordinates in Survey Pro
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8. If your projection record is a map projection
zone, the ground coordinate parameters will
be added to the zone record to create a zone
based site. If you are already using a site
record, the parameters will simply be
applied. In both cases, the Adjust with
Projection wizard will open with the Results
screen to show the updated job file points.
Tap Apply to update the coordinate system
and job file points.
Note: If your projection is a zone based site,
then the localization parameters will automatically be converted into
the corresponding ground coordinate values. You do not have to
resolve the localization.
9. If the conventional Survey Scale factor is not set to 1.0, you will
be prompted to set it to 1.0. Using Ground Coordinates, EDM
distances correspond 1:1 to grid distances.
Switching from Ground to Grid
1. When Ground Coordinates are set, go to the Survey > Projection
screen and tap Setup Ground Coordinates
2. In the Projection Definition box, select Use Grid Coordinates.
3. Tap Accept to switch back to the mapping plane grid coordinate
system, and open the Adjust with Projection wizard at the Results
screen. Tap Apply to set the coordinate system and update the job
file points.
Note: If your projection is a zone based site, then the localization
parameters will automatically be converted back to the map
projection values. You do not have to resolve the localization.
4. Switching back to mapping plane grid coordinates, the
conventional Survey Scale Factor is usually set to 1.0. You will be
prompted to update the scale to the correct value to reduce EDM
measured distances to the mapping plane.