My nav on my Z2 is off by 75 meters or so... and it wont correct itself. I've tried the "Modify Current Location" deal but as soon as I start movin it jumps back out of place.
Does your antenna have to be level? Mines just above the windshield on the drivers side roof and on almost a 45 degree angle. Have anything to do with it?
Also, did the XM module change for the Z2? My XM button wont highlight so I can push it.
I just updated from the Z1 to the Z2!