selway

for ground hunting i don't see a need for one.i just tap a piece of paper to my riser with a solid black lie on top with thinner lines at 20 30 40 and 50 below . for bull elk 28 to 30 inches from top of back to bottom of chest draw your bow at 20 yards and box a 30 inch box in with your first line at 20 and then go to 30 and so on.when you draw on a real elk just fit him in the top solid line and the thin line below.your doing two things at once ranging and shooting most of the time you wont have time to use a range finder when hunting on the ground.if the animals coming closer or farther away you will be ranging him all the time and still be drawing on him.
whitetail buck would be a 15 inch height . this has worked for me. as for tree stands this will not work angle of deer or elk is wrong. but if i take a tree i will pace of distace before climbing so i guess i don't need one. but they are kind of cool.