Hi, I bought the GV with this unit installed. That time the salesman told me the unit is only working through the Pioneer app on my phone. I later discovered that it was only the one cable that was plugged out. There after all was good and the unit worked for about a year. No it stopped. It gave me the impression that the sd memory was the issue. I removed the card put it in the computer and which only give a message to format the sd card. So I assume the card is the problem. The sd card does not have any markings on it stating TomTom or any thing only say 2g sd card and the manufacturer. So my question is does the sd cards give proplems like that? Can I get a cards from tomtom with the maps on it or do I buy the maps online (Almost R1000) and load it on A new SD card?