In another post it was sugested that one use a measuring wheel to figure out linear and sq. footage, and sure, I too have one. But do you use them all the time or do you know your own pace and can walk off a property and accuratly come to a realistic sq. or a linear footage? I've been able to walk things off, +/- a few feet per K, since my days in Boy Scouts a long time ago. So do you guys walk things off or rely on a wheel?