is a GPS receiver. I get lost in my driveway and yet I still do not own one of these things. In case you were wondering (you probably weren’t wondering, but I was), here is how the thing works: When people talk about “a GPS,” they usually mean a GPS receiver. The Global Positioning System (GPS) is actually a constellation of 27 Earth-orbiting satellites (24 in operation and three extras in case one fails). The U.S. military developed and implemented this satellite network as a military navigation system, but soon opened it up to everybody else. Each of these 3,000- to 4,000-pound solar-powered satellites circles the globe at about 12,000… Read More
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