Dell GPS Navigation System

I am trying to use the GPS Nav System with my Dell X51, and I am having some problems trying to load my diferent cities that I have added to the system. I have installed both of them on the SD card, and it will load my map for Las Vegas but I do not know how to switch to a map of St Louis. I have tried to search by region but the only states listed are NV, AZ, and CA. I have tried reading the manuals, and I don't see anything in there about this subject. Any help would be greatly appreciated!!

Thank you!
Josh