I am told to update my Go720 by 6 April or it will not work. When i try this TomTom Home says i dont have the space for the update..I must remove some files. I have nothing added since new so to make the space free i have to remove the Western European maps. If i do that i won't have any maps to navigate from! So i am stuck in the middle...update and remove the maps or don't update and no sat nav. I have a 4gb sd card mounted but it will not load the update into it...it wants to use internal memory. What do i do?