Is it possible to retroactively install a navigation system in an A6 manufactured in 1998?

Is the effort worthwhile, and does one need to be a specialist to do it?

Best regards,
Johannes.

I already did that. If you previously had a double-DIN radio (like a Symphony), it's relatively straightforward.

Look at http://navi-forum.net/board/index.php. You can find all the necessary information there, and if you have any questions, feel free to ask.

Regards,
Private.