GPS App to make, import and follow Tracks, including user profiles and sharing possibilities

Main function of the app is having a map on the screen with a track so the user can follow the track. The map should move dynamically so that user position is always centered + should have speed dependent autozoom functionality. Besides this the app is also a social media channel connecting to a website (also to be built). Users have profiles with some non common attributes specific for the user group in mind. Additional features: - Import of GPX and KML files as tracks - A graphical editor to edit tracks (only deleting portions of the track, not changing the track) - Logging of GPS activity as tracks - Facebook integration (possibility to post activity) - Picture and Video taking - Music Controls through swiping the screen - Possibility to "call" other apps through URL Schemes If successful, next versions of the app should also have: - Possibility to "call" a conversion function through some kind of service on the website (still to be built also) - Use of offline maps (probably using OpenStreetMaps) I have the main design ready in Xcode as a storyboard + many of the graphics (icons / app icon). Now I need someone to fill out the code behind it. Much of it is pretty standard I think, however there are some specific features that you as a developer should have (at least some) experience in: - Maps and displaying tracks on maps - Logging of GPS information - Understand Tracks and the GPX and KML file format and specifications - Syncing the user profile and user activities with the users account on the website (still to be built) - Facebook integration so users can share activities with friends