Hmmm yes makes sense if it comes without navigation. But what buttons do you use to navigate the in dash menu? Are those the ones under the steering on the right side?
All jazz brown interiors are Z models but not all Z models have Jazz Brown interior :). As the Jazz brown interior comes only in Z but it is an add on and needs to be bought, if you dont opt for it then you dont get it. It is not a basic feature, and it is only available in Z.