Spectra Precision Survey Pro v4.5 Recon and Nomad User Manual - Manual (Page 313)

GPS Module
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Adjust with Projection – Results
The Adjust with Projection Results screen is used to
preview the results of the adjustment before anything is
applied to the job file. The default view is to list the
action and results only for points that will be updated in
the adjustment. You can tap Show all points to update
the list to show the reason unchanged points are not
adjusted.
1. Review the results.
2. Tap Apply to update the job.
Projection Calculator
You can use the Projection Calculator to calculate combined scale
factor for scaling conventional distance measurements to the
mapping plane. You can also use the Projection Calculator to
calculate meridian convergence for reducing geodetic azimuths (such
as a sun shot) to grid bearings.
Scale Factor Calculator
1. Go to the Survey > Projection Calculator screen.
2. Choose a point on the mapping plane for scale computation in the
Select Point
control. Tap Solve Scale>.
3. Enter a height to compute Ellipsoid Scale Factor. This calculation
uses the height of the point above the ellipsoid to correct for the
effect of the terrain above the reference surface.
4. Tap Solve> to calculate the combined scale factor with the
selected values. The combined scale factor is displayed in the
Ground to Grid
box. The inverse combined factor is displayed in
the Grid to Ground box.