Ive got a Navman and a TomTom Sat-Nav, when you switch either of them on it starts up with a little graphic that shows a computer, a USB icon and what looks like a SD card icon, neither of them will go any further after that, Im pretty sure it's asking me to update the maps on the devices but can you not use them with the old maps?? Ive had a Garmin that you could still use even though the maps were like 3 years out of date, can somebody help me please?? Thanks in advance