StLCardsFan posted a great response on the article page that knowing the exact yardage with the help of GPS helps the golfer be more confident with the yardage and the subsequent shot. I totally agree with that assessment, however I'm not 100% sold on the idea of needing GPS to get that exact yardage personally. I think having a sprinkler head and a quick pace off of the distance from there is very very accurate in my own experiences.