Hi Jan, I have the same age A200 petrol coupe, also with Audio20, although the sound system is slightly better, and there's a CDC ...
It might be possible to get a [powered] bluetooth adapter wired to your AUX connector, which will allow audio via bluetooth (the one in your armrest is for calls only and will not stream music). It's kind of a DIY job, but could be tricky.
As for the satnav - obviously, the NTG2 Audio20 cannot be upgraded to have this capability.
So you can either:
- Fit an NTG2.5 Audio20 (with colour screen and bluetooth for phone calls) - so that's a yes to your question about MF2830
- Fit an NTG2.5 COMAND
- Fit an aftermarket unit, that looks like a COMAND, but quality might be hit and miss
- Buy a standalone satnav, say Garmin and have excellent quality and full voice control at a fraction of the price of the above options.
Personally I fitted (fixed stand) and hard-wired my old Garmin nuvi 3790 and more than happy with it:
- The position is much better - top of the dashboard, at eye level.
- Voice recognition is nearly perfect. Even its activation is via voice command - no buttons need to be pressed.
- It handles two bluetooth connections simultaneously - its own ecoRoute (plugged into OBDII port) and my iPhone6 (fully voice controlled too).
For my music I have six MP3 CDs, and I also fitted an AUX connector with bluetooth adapter (as mentioned above).
I do plan to fit either a COMAND or an aftermarket unit later on (mainly for the rear camera display and USB music), but for now I'm very happy with the current setup.
Even when I do that, I'm keeping the satnav where it is now - on top of the dash: