I'm real old-school...

When I set up a stand (usually well before season), I take 150 feet of rope and 3 colors of surveyor's tape. 30 yards gets marked with green tape, 40 yards with yellow, and 50 yards with red... I repeat this down each of my shooting lanes, and any other odd opening I can see from the stand. If the deer is within range, I have a good idea of the distance. Don't have to mess with range finders... Bottom line on my MK's scope is dead on for elevation at 48 yards... The WIND, I still have to guess. Under 30 yards? I could care less...

An added bonus is that it makes you REALLY survey the entire area around your stand... You just might notice that that little cedar tree just out of sight from your stand has been "rubbed" shoulder-high! That's enough for ME to move a stand!