GPS, or global positioning systems, have been around since the 1970s, when the US Department of Defense established a program using a group of twenty-one satellites to track the locations of their targets and send the information to military receivers. In the ensuing three decades, GPS technology has been adapted for civilian use, and is now widely available to the public. Commercially available GPD receivers can range in price to about $100 for a handheld unit to more than $…
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