The S20 is lightweight, comfortable and easy to use. Just read 3 or 4 pages of instructions and go. I suggest just using the base hole view the first time, like I did. This device read within a yard or two of the GPS watch my playmate was using and what the field markers were. Remember that the largest number (by size) is the distance to where the pen is located. If you haven't moved the pins, this is the center of the green. Unless you're playing golf with a handicap of 6 or higher and are moving the ball left or right when it hits the green, don't worry. I will update this review after a few more uses. After a round of 4 hours and 10 minutes, almost 30% of the dough was used up.
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