Hi Best_Shot,
I just got the SUV 2 weeks ago, so I'm not sure if everything was working before.The Nav works while I'm driving. It shows correctly my current position as I'm driving along. The problem is when I try to set a destination. Its always in California and pressing the States bring up the error of no data.
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I finally called Zenrin and the tech support rep told me that I need to bring the SUV back to the dealership for some hardware upgrade. The disc in the dvd drive is labelled as 6.4 and he told me that someone might have upgrade the disc without some re-programming.
So, if anyone buying a used QX56 or Armada with the NAV acting up like mine, just bring it back to the dealership.
Thanks to those who have replied me.