For me the nav unit was something I specifically did not want. I'm a techie geek but for me I wanted my Z for the driving experience. I know that many have their own reasons for wanting a Z. I just didn't want to have to ever have my Z in the shop because my hard drive failed and I had to take it in to the shop or anything else associated with a navigation system. I have a GPS in my phone and it works fine. I want to spend less time in my nav than I do enjoying driving. For others I know its different so its really all about what you want. If you like it, go for it. Either way, you'll have a Z!
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