Spectra Precision Survey Pro v4.6 Recon and Nomad User Manual - Manual (Page 134)

User’s Manual – Conventional Mode
124
Enter the point’s Ellipsoid Height to calculate the Ellipsoid
Scale Factor
, and tap Solve>.
Review the calculated combined scale factor to be used
for ground to grid reductions. The inverse combined
factor is what you use for grid to ground calculations.
Tap Accept to return to the Scale Settings screen where
the computed combined scale factor will be entered for
you.
Tap from the Scale Settings screen and from the
screen that follows (Job > Settings > Surveying) to save
the changes.