I range all my spots as part of my preseason routine. I put little flags in the ground that match the color of my pins (red,green,orange). When the buck comes in there is zero guessing. Red flag 20 yds, Green 30 and Orange 40. If there is an opening to shoot I put a flag there. I still carry the rangefinder though because its something can tinker with to pass time by. It's gospel guys, go buy you some little flags on a wire.