1. There is no clarity whether you will be able to replace preloded N.American maps coming with the unit with new releases of these maps in the future !!! This is scary !!! This would mean that you will be stuck with preloaded maps forever ???
2. Has anybody tried to use with the unit some additional maps (European for example present on SD card) ?? If so how big the card was and how successfull were you ?? (I heard that only cards up to 1GB are guaranteed to work)