So I figure I'd pur gps on my computer in my car. Silly me thinking I;'d have what I needed.. Duhh.. Yeah I need a map. So as long as I have a internet connection I can use google, but I want to do this while driving. So the only way to do this is to load a map on my computer. Now, I understand I'm not going to get google maps on there.. but what about all of usa roads only? Surly I can get that on a few gigs no? And where does a person get a map + software to use it?