Discover, May 1st, 2000
Even the best technology in the world can't seem to calculate how high this mountain really is FOUR POUNDS DOESN'T FEEL like a lot when it's a bag of groceries you're schlepping out to the parking lot. But if you're lugging it up to the top of Mount Everest, four extra pounds in your pack can feel like a ton. The climbers who took a four-pound GPS receiver to the summit of the world's highest mountain last year were convinced nonetheless that the extra weight would be worth the effort. That's because GPS--short for "global positioning system," a satellite-based network that uses radio signals...
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