This was my confusion (and remains so, really). I posted because of the requirement I have an old map in the unit and not the current North American map. I was hoping there was some version for Chicago for City Explorer that allowed you to use the most current North America map.

I'm confused why it's needed to keep an outdated (that 2014.10) in order to get the Chicago one to work. Is that indicating that the Chicago map is a little dated as well?

Thanks!