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iPhone Application Development for iOS 4: Visual QuickStart Guide by Duncan Campbell

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8. Location and Mapping

Having an iPhone means that you need never get lost again. With the iPhone’s built-in Global Positioning System (GPS) hardware and some innovative location and mapping software, not only does your iPhone know where you are at any time, but it can also show you.

The iPhone uses a technology known as assisted GPS to work out where you are. In addition to the built-in GPS receiver, the iPhone uses triangulation information from cellular towers and Wi-Fi hot spots to increase the accuracy of the location data it delivers to your applications.

In this chapter, you’ll first take a look at Core Location—the framework that lets you quickly ...

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