Having a golf GPS unit like the Garmin Approach G3 in your bag is a bit like playing with your very own PGA Tour-quality caddie. These small electronic devices have evolved a great deal since the USGA deemed them legal for play in 2005. As you move about the course, the Garmin Approach G3 unit, a waterproof, touchscreen golf device pre-loaded with thousands of North American golf course maps, continuously updates your position. A high sensitivity GPS receiver indicates the exact yardage to each target. Invaluable for those who need to know the correct distance to the pin before they pull the trigger. $229.99.