Using the built-in GPS receiver and accelerometers of the iPhone Air Navigation can simulate various aircraft instruments such as HSI, ADF, CDI/VOR, Altimeter. Unlike real navigation instruments, the virtual instruments can be set to point to any waypoint in the database (airport, VOR/DME, user waypoint, etc).
It is considered very useful for when flying in turbulent conditions.
Note: In the default mode the instrument displays the course of the selected waypoint on the map/route automatically. You can cancel this behavior by switching off the option «Adjust Nav 1 to map leg» under «Settings». It is also possible to automatically align the CDI by switching on «Auto adjust OBS» option.
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