Regarding map .img files on SD/microSD cards purchased from Garmin (to which i'm sure you are referring), yes, you may simply copy them. Depending on how the cards are obtained, the maps on them may be locked to either the card (they can be then used with that card in any device but not on another card), or they may be locked to a particular device, in which case they cannot be used other than for that device. That is, unless they are unlocked using one of the unlockers from [Only registered and activated users can see links. ]. Have a look first at some of the tuts in [Only registered and activated users can see links. ] first, scoll down to 'Unlocking soft ,maps and IMGs' in the index.