Looking to invest in GPS. The thing that has been holding me back is the job set up.. A lot of my work is agriculture related waterways, terraces, etc.. USDA/NRCS does not use CAD, so my question is what would it take or is it possible for me to go to the field and map a waterway out 40' wide and 1.4 deep and have it ready for a machine control unit. Also most of my jobs are not on flat land, the slope percents will change from one spot to the next.