> Is the fence on their property? Even if the values were precise, the fence can never be precisely located. Land/parcel demarcations don't work that way. Also

> Is the fence on their property? Even if the values were precise, the fence can never be precisely located. Land/parcel demarcations don't work that way. Also, GPS coordinates change over time. Or rather, the land underneath moves. Fence or other land locations are always relative (to an official surveyor's point), not absolute. Rewinding a little: > Imagine, for a moment, that someone uses these values to put up a fence. There's your first problem.