As a previous owner of the e46 unit, I'd definitely be interested if they came out with a nav replacement unit.
When I was looking for my M, nav was a must-have but I'm regretting it now. Wish I'd gone for the non-nav unit now since the interface is soooo dated!
Honetly though, I'm not sure if there's a big enough market of our superseded Zs for dynavin to make us a priority :-(
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