I just reinstalled my Z1 into a Subaru Legacy GT. The nav was crooked for awhile. I couldn't figure out why but I just reset all the settings in the 3D Calibration Menu that can be found under Menu > System Settings > Hardware > 3D Calibration Menu.
It reset everything for me and it works great now. Just thought I'd share that. I'm not sure how obvious it is but I couldn't figure it out for about a week.
