new zumo XT (using PC), I've been trying for days to plan a route from Florida to Maine without using interstates. i can make the map import it to the GPS download it but when it gets to 100% and the saving it just sits idle and won't do anything. any help would be greatly appreciated. i have even tried to load it on to a 32gb sd card. even tried making the trip; into 4 days with maps for each day.