You may be right grawoo... Checking other Forums on the subject, there are post with the same problem. Could be the folder structure or a system file on their SD card, don't think it's a different type of card used, thanks anyway. We keep looking for solution.
One thing you maybe able to try is to format the card in either FAT or FAT32 format first before putting the maps on it, Not sure if this will help or not. Funnier things have happened though so it may or may not work.
That's exactly right... Go here: sendspace (dot) com/file/s65cdr and download the maps for Belgium, Holland, etc and you will see what I mean about the folders when you unzip the file.... You don't need a large SD card for this one.