We've been asked this exact question numerous times, and without throwing all the physics and ballistic numbers at you the answer for bowhunting applications is NO. You don't need to buy a rangefinder with ARC. This is a marketing gymmic and dont be fooled. If you want the "true" distance, range a tree at the same height as you, but at the horizontal distance of your target. Problems solved, now you have the "true" distance and you saved $100.