Conclusion: Sonocaddie GPS : Golf is a game of inches. It can easily be won or lost by the way you read your approach shot. Just a bit off and you go up another stroke. Read it right, and you shave another stroke. The Sonostar Sonocaddie GPS makes your dreams come true by merging its high tech GPS coordinates into the game, providing accurate yardages to each target. Now you can spend more time concentrating on your swing and less time worrying about the accuracy of your guesses.