Chapter 14. Where Am I? Finding Your Way with Core Location
Your iPhone has the ability to determine where in the world it is using a framework called Core Location. There are actually three technologies that Core Location can leverage to do this: GPS, cell tower triangulation, and Wi-Fi Positioning Service (WPS). GPS is the most accurate of the three but is not available on first-generation iPhones. GPS reads microwave signals from multiple satellites to determine the current location. Cell tower triangulation determines the current location by doing a calculation based on the locations of the cell towers in the phone's range. Cell tower triangulation can be fairly accurate in cities and other areas with a high cell tower density but becomes ...
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