YES, slope is important when getting a range finder to get really accurate distances to the pin while golfing!! When you play a hole where the tee shot is higher than the green, there is a difference in the distance your ball travels. Let's say the marker is 130 yards away but the slope is 10 degrees down. The tilt indicator tells you the marker is 130 yards from the marker, but it's played as if it's 117 yards away! This can completely change your club selection and swing speed! So if you're looking for a rangefinder that can really pinpoint ball hit distances, slope is a much more accurate reading for any holes that aren't dead at height either. The mode is illegal for tournament play, but all your practice rounds and experience with this feature will really help you understand for yourself how tilt affects the distance your ball travels, and you'll start to get a better "feel" for it Get incline variations without using this feature for tournament play. So it's still a great feature to improve the accuracy of your golf game!