Spectra Precision Survey Pro CE v3.80 Ranger GPS Reference Manual - Manual (Page 43)

Survey Menu – RTK
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Values : is where you enter the values for the custom ellipse if you
are not using Ellipse from List :
Ellipse a : is where you enter the semi major axis of the new ellipsoid.
Other Parm : is where you select the other ellipse parameter to enter.
You can use one of: Semi minor axis; Flattening; Reciprocal
flattening; First eccentricity; First eccentricity squared; Second
eccentricity; Second eccentricity squared.
Projection Key In Setup - Datum Translation
The following screen is only displayed when Datum type is Molodensky
or Similarity .
Datum Translations From WGS84 : 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 reverse the sign of
the values before entering into Survey Pro.
Projection Key In Setup - Datum Rotations and Scale
The following screen is only displayed when Datum type is Similarity .
Datum Rotations From WGS84 : 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 reverse