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Devices for navigation and location that make use of the data transmitted by the Global Positioning System, the network of satellite transmitters in orbit about the Earth

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I keep reading in articles that GPS on the iPhone, or any cell phone for that matter, uses a lot of power, but I've never heard an explanation of why. Why is this? The phone doesn't have to transmit … like it does with 3G or WiFi. Does the actual act of receiving and amplifying the signal take a lot of power? Or is it used by the CPU? I find it hard to believe that the computation necessary to process the GPS signal would tax a modern processor. So where does the power drain come from? …
asked Oct 4 '10 by Charles Shopsin