I have always had this problem with my Z1. It think that I am about 50 feet behind in the road than I really am. I can drive throughan intersection and the map shows that I'm about to get to it. It is pretty annoying. I have had this problem without VSS connected and with VSS connected. I have tried resetting the unit several times. It always ends up doing the same thing.

Any suggestions?

you can mod current location in the menu

i hope that helps

Live with it... I have the same issue and there doesn't seem to be any way to correct it. Changing your current location like stated above doesn't work.