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ArcPad stores an internal list of methods and parameters used for transforming coordinates between two datums called the Projection Engine. For many pairs of datums, more than one transformation method or set of parameters exists to perform the transformation. When this occurs, ArcPad selects the first match for the two datums it encounters.
Determine the default method by following these steps:
Datum transformations work in either direction.
For example, if Datum_1 is D_North_American_1927 and Datum_2 is D_North_American_1983, the method will support transforming from NAD 1927 to NAD 1983, as well as from NAD 1983 to NAD 1927.
To verify that a transformation is being applied in ArcPad:
1. Open a map with a projection based on one of the datums of interest.
2. In the GPS Preferences dialog box, Datum page, set the GPS Datum to the other datum of interest.
3. Click the icon and review the transformation parameters displayed.