The Callaway GPSy Golf GPS watch provides fast, accurate distances to greens, hazards and doglegs. The GPSy automatically locates your course and will auto-advance from hole-to-hole during play. It provides accurate distances to the front, center and back of the green as well as layup and carry distances to hazards and doglegs. Auto-course recognition and shot distance measurement both help improve your game. With over 30,000 golf courses from around the world, plus no annual subscription fees, this GPS Unit is bound to become your new best friend on the course! Battery life is 10-12 hours in GPS mode and 90 days in time mode.