I play with 2 guys all the time and all three of us always use Golfshot. Every time we compare, the readings are on average 2 to 4 yards different between each phone. The twenty yard difference mentioned before sounds like an interference problem at that particular time... Occasionally my app is 600 yards off... just wave the phone around a bit if the gps looks "off" and it tends to correct itself.
9/28/12 at 12:26pm