That's so crazy to me. You're right, but car manufacturers should be ashamed. It's not even the onboard part of it that drives me nuts, it's the web interface. Something that every high school kid in america could easily fix for them during a break from their twitter account. The route planner is designed by somebody who has CLEARLY never heard of google. Enter a start point, click the address in the list, trust that the whole thing is in the text box that it doesn't fit in, click the search button, click the address again so its pin will show on the map. Click add waypoint, enter an address, click in the list, click search, click the address for a pin, repeat for all the waypoints and final destination of your trip. Once you've clicked search on each one and verified them manually - TWICE - it finally lets you hit the button to plan your route. Painful.
In google maps, you say navigate to the georgia dome, and hit go, it figures out the addresses & calculates it all for ya, then if you want to add waypoints along the way it's just as easy. Burger King, and it adds a nearby burger king along the way. I can't think of any excuse for Carwings to have such an antiquated direction system. The eco trees are strangely fun for me though, I must admit.