Software version 20100324 Hardware version GPS 35 Dear Sir/Madam, While using the above instrument it suddenly produced a message "A fatal fault has occurred and (something which I could not read) must close now) which it did and I can now not access Navigation, though the other two screens work (GPS & System) , though GPS no longer makes any contact. Is there any way I can delete the old Navigation and download a new one?? Many thanks, Walter J Morris