Wow, w_harv, thanks so much for the detailed reply. I'm gonna have to print this out and ponder it for a while. My father in law is a retired civil engineer/surveyor. I think I will give him a call and see if he kept any of his surveying equipment. If he kept his transit and tapes, he'd be the one to assist with laying out the fence, eh? Forget the string, just have him set up at a corner, shoot two sides, set up at the opposite corner and shoot the other two sides, just like doing a survey!