Hi, I installed a map of the USA onto my TomTom One XL device about four years ago with the assistance of a memory card. It worked perfectly when we went to the States. But, now we are going back and I am not able find it on the device. When I go to manage my maps I only have Western Europe and I can't find the USA map anywhere. When I connect the device to my computer I can see that there is a USA map folder, but no way of accessing it on the actual device.