A traditional GPS receiver needs to process data from at least four satellites to determine its position; in a ­location-aware camera, that's a huge battery drain. A GPS camera using a new system from Geotate, however, requires just a fraction as much satellite information. Once photos have been transferred from the camera to a computer, software queries a database of historic GPS data to determine where they were taken. By delegating all the computational work to the computer, the system allows the camera to consume only one-hundredth as much power as a conventional GPS receiver does.

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