Hi Bren, welcome to the forum and possible RCZ ownership

quite a few owners have reported problems with the early Navs, mostly down to broken cable or poor cable routing, I'm sure you'll find what your looking for by searching old posts.
I have the NG4 system and have never had any problems but there are loads of good second hand Zs on the market so it might be better looking around for a problem free car.
Good luck keep us posted.
