Well, if your model does take a sd card, then you put the card in the slot on the bottom of the unit. With your model (assuming it uses a card), **everything** must be on either internal OR the sd card.
So, use Explorer with the sd card installed, and copy everything from internal to the card.......make sure hidden files/folders are showing.
Thus, you will have a bunch of folders and some loose files on the card. The loose files (comprising the operating system of the unit) reside in the 'root' of the card (i.e, not in any folder).
When you boot up the unit, it'll boot to the sd card and use the information found there (like the map in the specific map folder) for its planning.