I am trying to pick up slack from the previous CAD tech, he changed AutoCAD 3d Maps to run like regualar AutoCAD, after changing and fixing it back, I am now having to make new drawings with points taken off the GPS and correspond them to his previous drawings.
 
The issue is that the GPS points have GPS attached to them and I'm not sure how he did it but his drawings, using the same system, does not have GPS, I get an error if I try to combine the drawings.
 
Please help

why dont you try Google Sketchup?