I just bought a used Mazda 6 GT GJ, when I start the Nav it says No Maps found. The car came with a SD card and has maps in it, but the car still says no maps found. I even bought the latest Australia maps and installed in the SD card, but still no luck. I also got a new SD card, and tried to initialise it as mentioned in Intranet, nothing happened. Could I get help on how to fix this.