The trajectory compensation is more usefull in the mountains. If you are a typical bowhunter and are hunting from a 20' treestand, your reading from a regular rangefinder will only be off 1 yard at 20 yards and less than a yard off as you go further out. In a 30' tall treestand your reading will be off 2 yards at 20 yards and 1.5 yards at 30 yards and so on. So as long as you are hunting from an average treestand, in normal terrain, you wont have any problem with a normal rangefinder. A nikon 440 is the perfect bowhunting rangefinder and it's around $180 at Cabelas right now. Hope this helps.