iNavigator is an aircraft navigation app for the iPhone and iPad featuring a moving map view, Horizontal Situation Indicator, a worldwide navigation database, airspaces, terrain and weather.
Full integration with the iPhone/iPad environment allows creating, modifying, and activating a route, or performing a Direct-to using simple touches on the screen.
The built-in simulation mode allows connecting the app to Microsoft Flight Simulator via WiFi.
Check the Simulation page for details on how to setup MSFS.