The reliance on electronic measuring devices has exploded over the past 5 years. Virtually every serious golfer has at least one device they carry during each round. Personally, I use a Garmin Approach 6 because of the versatility it offers when playing new courses. On my home course, I do not use my electronic measuring device all the time because I know the distance to the center of the green from most locations.
Now just suppose what would happen if your GPS dies on the golf course at a critical time. Would most players panic or pull out another device. This is a question I posed a couple of days back and I think you would surprised at the answer!