Nokia removed its navigation app, HERE Maps from the iTunes store and blames it on the recent changes to iOS 7 because it harms the user experience. They say:

"We have made the decision to remove our HERE Maps app from the Apple App Store because recent changes to iOS 7 harm the user experience. iPhone users can continue to use the mobile web version of HERE Maps under m.here.com, offering them location needs, such as search, routing, orientation, transit information and more, all completely free of charge."