GPS2CAD is the only GPS software we know of that is directly compatable with AutoCAD Versions 2000 through 2009 and lets you easily bring your GPS points into your CAD environment: at the click of a button, you can plot polylines, points, and blocks.
Blocks and points can be plotted in 3D, for use in terrain modeling packages, and the blocks carry attrubutes showing all the point data.