مقاله ای در رابطه با دقت تعیین موقعیت با گوشی موبایل (iPhone)

Accuracy of iPhone Locations: A Comparison of Assisted GPS, WiFi and Cellular Positioning

Transactions in GIS, 2009

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Below are the results of this study including all three locational systems

3G iPhone w/ A-GPS ~ 8 meters

3G iPhone w/ wifi ~ 74 meters

3G iPhone w/ Cellular positioning ~ 600 meters