I'm told the new nav is NOT tomtom.
The TT does work and has full postcodes, I dislike it because I had trouble with the live services for traffic, its on a small screen, and does not show time and phone information on the screen. And the resolution was really dated.
But it does show GPS speed which is very useful.
I despair really with Mazda inability to provide a sat nav that provides what my 2009 Xtrail did, although the Nissan model I had didn't do post codes, but that was the only negative, traffic was free. And I could get it to play an amusing tune or sound on about six destinations, a barking dog for example, daft but it put a smile on our faces.
The cx-5 clock was below the heating controls and difficult to see, it was unsafe to use it while driving as you had to look down and focus, I use reading glasses which doesn't help.
Sorry I keep forgetting you are in Germany.
Does you car has the I-loop, its in the e manual but the UK cx-5 doesn't get it. Only some models of the Mazda 6.