There is margin distance difference from the average height of a treestand, but I agree with Kodiak, for those hunting out west from perhaps extreme angles, it would be helpful. I'm a gadget person, unfortunately, and bought one. I like it, but for most of my hunting it shouldn't be much of an aid. So, if you primarily hunt deer from stand and want to be penny wise, there are plenty of cheaper less complicated models out there.

The formula for calclulating the distance is a simple geometry problem a-sqared + b-sqared = c-squared, where a if the height and b is the distance from the base of the tree or stand.Convert the height to yards, square it then add the square of the 20 yards from the base then take the sqare root of the sum. That confused even me, so may it's not that simple...lol Rob's calculations are correct in the above post. Good luck

Kelly