Mountain View's mapping service is back on iOS, but Google's cartography team isn't content with launching a standalone app: it wants to worm its way into other developer's apps, too. Leveraging a URL scheme, Google Maps' iOS SDK allows developers to call up its own navigation application in favor of iOS 6's offering. The SDK also demonstrates how to perform a quick check to make sure Google Maps is installed, allowing apps to default to Apple's solution if it isn't f
