Quote Originally Posted by H. Walker View Post
Ok you GPS guys I'm new to this technology, is there such a thing as being able to do elevatons accurate enough to set main lines at 2 or 3%?
The short answer is yes, it is possible. The longer answer is it'll cost you far more than it's worth. Professional GPS receivers for surveying work are quite pricey, and for that kind of money you'd be better off buying an RO or vac system.

What you can do with a commercial handheld GPSr is map out the locations of your trees with fair accuracy and overlay that data onto a digital topo map to determine the best positions for your mainlines.