I got a 510 for my wife and have been having problems with the mapping software. It can't seem to find a lot of the addresses in our area. I tried to download a map of the Upper midwest, but that is too large for my available memory, even after I deleted a lot of useless voices and so forth. What are my options? Can I buy a bigger SD card for it. I tried one that I have as a spare for my camera and it wouldn't recognize it. So far, we have been able to use this thing on only one trip. Tech support is busy all the time. Please Help. Anybody.https://www.tomtomforums.com/images/smilies/mad.gif