Oh, okay. So that makes me think there aren't really any freely available map updates, despite what AM stated, and the updates that are downloaded are just some minor configuration changes. I didn't buy mine until a couple months after moving from North Charleston so I can't compare my experience with yours, but I have noticed a number of issues related to missing roads, POIs that have been shut down for a while/no longer exist, and it wanting me to turn in places where roads no longer exist or are one-way. Talking to people that have lived here longer they have been that way for quite some time. I would have to check again, but I think the map version that comes with the system is from 2012.
2013 V6 Premium GHIG purchased 01/16/13