The HSI/VOR Trainer allows you to position the plane by dragging it with the mouse to a position around the VOR, adjust the plane's heading and the HSI and VOR's OBS headings, and observe the indications.
The OBSes of the HSI and VOR are connected so as you turn one, the other indicates the same. When the plane is located outside the compass rose, the VOR is flagged "off" to simulate out of range.
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"Red" - a single press or holding the red button will turn the OBS indicator counter-clockwise.
"Green" - a single press or holding the green button will turn the OBS indicator clockwise.
- Press the "left" or "right" button to turn the plane in that direction.
- As long as you hold the button down, the plane's direction will change.

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