Pooch, we talked a little about the chips the other day. Mine is the garmin inland lakes on a mini or micro sd as well but had the adapter with it when I got it. If you can get the navionics i would go with that, not sure of any others but maybe you could contact the seller and see if you could get it already on a mini. I was able to put the mini in the adapter and copy it to my desktop on the computer and transferred no problem.