Home - handleOpenURL: Web sites can launch iPhone applications without prompting. Objective c - How can I launch the Google Maps iPhone application from within my own native application. For iOS 5.1.1 and lower, use the openURL method of UIApplication.
It will perform the normal iPhone magical URL reinterpretation. so [someUIApplication openURL:[NSURL URLWithString:@" should invoke the Google maps app. From iOS 6, you'll be invoking Apple's own Maps app.