Knowing distance is crucial for shot decision-making and scoring. Rangefinders give everyone the ability to have that data. Slope takes that one step further and improves distance calculation for differences in elevation, pretty much most shots around here. I am happy to hear rangefinders with slope ability are now approved for tournaments. I am not sure why they have to turn slope off, but it is nice to know I could use the V4 both day to day and in a tournament.