Another flaw I've found with navigation, it hasn't learned my route habits, and navigation is quirky. For me when I come down county road to go home all I have to do is make a left into 35 north, but the navigation tells me to make a right, go up to the next light, make a u-turn and go back north which is totally incorrect. I have left the navigation on about 10 times and it still has not learned the proper route. The navigation does take you some very awkward routes even if you change the settings. My Z2 was so much better in route selection. County road has been there for 30 years as Is the allows of turning there, so it's not a new road. My z2 picked the proper route.
I had hoped that the NEX units were better at "learning" routes than the Z150. Waze seems to have that capability.