Garmin Dakota 10

hey guys,

somebody asked me to update their Dakota 10 with a new map as i did several Tomtom navigations before, but i have no clue on how to do this on this little garmin device... can somebody link me to a tutorial (if i do a search on this page, the only thing i get is dakota as a place in america instead of tutorials...) or tell me how i can do this?

thanks in advance

FGOD