Garmin Approach S2 Golf GPS Watch (NEW VERSION w/ 30,000+ Courses) | 60-Day Buy & Try Return Policy! (Black)
Precise, accurate and very easy to use.  I keep charged when it's not being used and I have had great battery success so far.  I have checked measurements with a laser range finder as well at the yardage markers and sprinkler heads at my home course.  Given that my game does not need even remotely that much accuracy, it's still right on the measurements.  Good tool for club selection and has improved my scores (18 hcp) and reduced my time over the ball.  It has the added feature of being comfortable to wear