If you are looking for quick yardage confirmations, slope adjustments for a “plays like” distance, and green slope information for your approach shot into a green, you typically need to either pay a good caddie or slow things down and use a laser rangefinder with slope and reference a green book (if you can find one). Of course, neither of these options is all that feasible for most of us amateurs, but the Voice Caddie G1 GPS watch is an intriguing solution that provides yardages, slope adjustments, and green undulation maps at a glance.
Read entire review using link below.