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I have just looked in an A3 Details brochure and accoding to a picture and description they are related to the Navigation system. The picture shows 4 button and a joystick. One button shows what seems to be a queue of cars, one says Return, one Nav and one Info.
The text says:
"Navigation System. With the Navigation system, you just select your destination and then allow yourself to be shown the most favourable route by a friendly voice and pictograms on the display in the cockpit (controls in the central console); including driver information system"
Perhaps this was the way it was done in the older pre-full screen navigation system.
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The controls are for the CD-Rom based Sat Nav system, conventional Symphony or Concert type head unit in this type of install. Around £1000 cheaper than the DVD Nav plus solution,,,,,,