NN3D and SD cards
What SD card size can I use with my MFD12?
If the NN3D MFD12 or MFD8 have version 2.07 software or greater; you can use SD cards up to 32GB in size for loading charts or saving information. When you conduct a COMBO software update of the operating system regardless of version you need to use a 2GB or less SD card. keep at least one of these low cost cards for doing your updates with, and then you can use larger SD cards up to 32GB in your unit for other purposes like loading larger map files.