Originally Posted by JonnyNov

Imo unless you are hunting on a huge dropoff, then the whole arc idea is not mathematiically sound. a2 + b2=c2. If you were hunting 16 ft in th air and the deer was 90 ft away (which is roughly 30 yards) then the "arc" distance is 91.41 feet (which is roughly 30.47 yards). Doesnt really seem worth it to me.

Originally Posted by RIStrutStopper

If steep angles are involved or you're rifle hunting out west, maybe arc is worth it. For typical bow hunting situations there is a very slight difference. On relatively level land and typical stand heights, the difference is insignificant. Pythagorean Theorem, do the math.