The VOR Tool is used to demonstrate the use of a VOR for navigation. The HSI is used to demonstrate how the pilot uses a VOR/DME and an OBS to determine the airplane's position.
Reading the CDI on your HSI or OBS, and getting the situation straight in your head is not the easiest thing to do, especially for a beginner. This App helps with that visualization. You can easily drag the airplane or VOR around or let the airplane fly randomly on its own.
In the Windows version you can use the mouse to drag a course for the airplane to fly.
Cessna 172-P Skyhawk N96178
New Market Airport (8W2)
New Market, VA