This app simulates an HSI receiver for aircraft. An HSI is a Horizontal Situation Indicator found mostly in more expensive aircraft. In addition to portraying an HSI, this app allows navigation to both Navids and US Airports. It will indicate the bearing to the station and it's distance from your current location.
A great learning tool for students, pilots and instructors.
It's also just fun to have on your phone!
Have a great flight.