GlobeKit

GlobeKit is an all-in-one solution that provides you full access to the iOS MapKit framework for your games! This plugin fully pushes your games to a new level of gameplay and social interaction through the location services. Build parallel worlds, create smart ways of using your player location to make the gameplay more innovative and fascinating!

Check out the online tutorial.
Requires iOS 3.1.3 or greater and runs on all iOS devices but the old iPhone 3G.