Udg: User-Defined Datum To Grid Transformation - ashtech DG16 Reference Manual

The DG16 performs an internal coordinate transformation from WGS-84 to WGS-
72 so that geodetic position messages can be output in the desired coordinates as
dictated by the parameters specified in the UDD command. Figure 4.8 illustrates
the translation and rotation that occur in the WGS-84 to WGS-72 transformation.
Figure 4.8. Rotation and Translation Between the WGS-72 and WGS-84

UDG: User-Defined Datum to Grid Transformation

$PASHS,UDG,s1,d2,f3,f4,f5,f6,f7,f8,f9,f10,f11,f12,f13
This command sets parameters to transform geodetic coordinates specified by the
UDD command to grid coordinates. The DG16 performs the transformation
internally. The number of UDG parameters required for the transformation depends
on the type of map projection selected, and must be indicated by the user in the d2
parameter.
Receiver Commands
Coordinate Systems
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