Ive been using this app since buying it on my iPhone 3GS.
Its great that it still gets updates. It works better than ever on my iPhone 6S.
I just noticed that something I wanted had made it into the app; you can delete "Panorama 3D" map if you dont want it using space. I dont know when this feature was added, but I really like it! (I can now "restore purchases" after a reinstall without worrying about 730 MB of unwanted data downloading to my device.)
BitingChaos about NAVIGON USA, v2.16