Spectra Precision Survey Pro v4.5 Ranger User Manual - Manual (Page 230)

User’s Manual – GPS Mode
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8. Tap Next to select the datum. The screen that opens will depend
on the datum type you specified on the first screen.
9. If you selected Pick from Data Base, pick the database Datum from
the list. If you selected either Custom Molodensky or Custom
Similarity
, then select an ellipse for the new datum. You can select
Ellipse from Data Base
to use an ellipsoid record from the
database, or you can select Key In Ellipse to input parameters for
a custom ellipse.
10. Tap Next to open the next screen. If you are using a database
datum, the next screen displays the parameters for the new map
projection zone and you can Store the record.
11. If you are using a custom datum, enter the datum translations
from WGS84 to Local.
Note: Note the sign of the datum shift and rotation parameters.
Survey Pro requires you enter the datum transformation parameters
in the direction of WGS84 to Local. If your datum parameters are
given as local datum to WGS84, you will need to invert the conversion
parameters before entering into Survey Pro.
12. Tap Next. If you are using a Custom Molodensky datum, the next
screen will be the final screen where you can Store the record.
13. If you are using a Custom Similarity datum, enter the rotation
from WGS84 to the local datum. Also enter the scale, in parts per
million from WGS84 to the local datum.
14. Tap Next to open the final screen where you can review the
parameters for the new map projection zone and where you can
Store the record to save it in the coordinate system database file.