I've done some research on this and it is possible to update the Garmin maps using Garmin Express, but you need a 16Gb memory stick (must be 16 not more or less). I have to admit I haven't tried this on my car as I hardly ever use the Garmin satnav. Install Garmin Express on a desktop PC (Windows in my case), you can find out how by Googling it. In the car, inset the memory stick before starting up then in Satnav mode go to Settings/Device/Update Map. This then records the spec of your car on the stick, it is removed and you return to Garmin Express on the PC, it reads the stick and downloads the maps required (follow the instructions). If all successful then return to the car and use the "update maps" to refresh the car's memory. Simple really!