Tech: Having Fun With GPS

Handheld satellite-navigation gadgets now come with games built in

Mary Lee Gunn, 58, a middle-school math teacher from Auburn, N.Y., filled a small black box with marbles last week and carefully hid it along the edge of a canal. Using a GPS (global positioning system) device, she recorded the exact geographic coordinates of her stash. Then, when she got home, she posted the box's location--along with some digital pictures taken near the spot and hints on how to find it--on the Web and invited anybody who was interested to try to find it.

If it surprises you that anyone would care enough to take Gunn up on her challenge,...

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