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The GPS tools on the Main and Edit tool bars are not enabled.
A projection is not defined.
The GPS tools are only enabled when a layer with an associated projection, or .prj file is added. The layers need to be in a supported projection. ArcPad supports the following projections:
Gauss Kruger (also called Transverse Mercator)
Lambert Conformal Conic
New Zealand Map Grid
Cylindrical Equal Area
These cover all UTM projections (AMG, MGA, and many national grids). State Plane is covered by Transverse Mercator and Lambert Conformal Conic. The only State Plane zone not supported is Alaska Zone 1, which is an Oblique Mercator projection.
ArcPad does not perform any projections of map data. The only projection that ArcPad performs is from the lat/long GPS coordinates to the projection of the current ArcPad project's map data.