Beside MotionX GPS Lite the application for iPhone, here is XRoad G-Map that function for GPS navigation system. The XRoad G-Map application only need 933MB in your iPhone storage capacity and priced at $20. It offering offline GPS with West Mississippi map in 3D view. It not supported with WiFi connectivity, but can give you direction in standard GPS function, such as POIs and location searching. If you really want to add your iPhone application with XRoad G-Map just click here for download.