I recently move to the Phoenix area and have to drive all over the Valley . this unit do live up to they promise out of the box . if you go to Garmin 's website , you can download update driver , computer to c320 unit interface that allow you to customize the unit for you purpose . with the standard sd card slot , you can upload huge area with good detail . the address or site imput be quick and easy and the detail be so good that it will even tell you on which side of the street a location be . this unit save I so much time and trouble travel from point to point . I can not wait to download 3d topo map for off-higway driving .