"Geotate's approach is a redesign of the system that loses the processor. Instead, the hardware simply captures a small sample of the location data that the satellites send in less than 200 milliseconds, and it stores it in memory. When a person uploads her pictures to a computer, the accompanying GPS data is used to calculate location information by employing the computer's processor and by querying a database to check satellite data. The process requires only 10 millijoules of energy, says Geotate's Marshall, which is about one-hundredth of the energy used in a traditional GPS system."
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