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GPS is an awesome tool. And with the advent of WAAS it is even better than it was 8 or 9 years ago. Most units will store 500 waypoints and are accurate to within 3'.
The only thing I can stress to some of the newer users though is always carry a compass too. GPS can go down at the drop of a hat or rather the flip of a switch. It very seldom happens but better to be prepared just in case. Heavy cloud cover can make it difficult sometimes too. As the unit (most units) need 3 good signals from sattelites to triangulate your position.
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