Spectra Precision Survey Pro v4.5 Recon and Nomad Reference Manual - Manual (Page 227)

Survey Menu – GPS Module
R-219
Key In Zone - Datum Translation
The Key In Zone Datum Translation screen is used to enter
translations when the Datum Type is Molodensky or Similarity.
Datum Translate From WGS84 To Local
: is where you
enter the three translations from WGS84 to the local
datum.
Note: The sign convention for the datum translations is
from WGS84 to the local datum. If your datum
transformation is defined for local to WGS84, be sure to
inverse values before entering in Survey Pro.
Key In Zone - Datum Rotation and Scale
The Key In Zone Datum Rotation and Scale screen is used to enter
translations when the Datum Type is or Similarity.
Datum Rotations From WGS84 To Local : is where you
enter the three rotations from WGS84 to the local datum.
Scale Factor (ppm) : is where you enter the scale of the
datum transformation from WGS84 to the local datum.
The scale factor is entered in parts per million.
Note: The sign convention for the datum rotations and
scale factor is from WGS84 to the local datum. If your
datum transformation is defined for local to WGS84, be
sure to inverse the values before entering in Survey Pro.