Like many have said before me.. confidence. I will use a rangefinder the first day in a stand and range trails and objects (trees, rocks, etc). I then store that info. into my memory and hunt.. never second guessing myself. It is purely for confidence.

And like Kodiak said.. I also use my rangefinder the same way he does.. I always carry my rangefinder into the woods when first hanging a treestand. I do this because like several others.. my comfort range is 20 yards. I will shoot out to 30-35, but I like to keep it closer. A rangefinder helps me estimating just how "off" a trail (or the like) I want to be.

But I do not depend on my rangefinder.. It spends more time in the truck than on me.