The green is 150 yards away, do you really know which club is the right one to choose? You can answer this question and more with the Approach CT10 Automatic Golf Club Tracking System and compatible Garmin golf watch (not included). The sensors screw into the ends of your club's grip and are designed to be virtually undetectable while you play. They activate automatically when a club is pulled from your bag, and go to sleep when you put it back to preserve battery life.