My 520 seems to be stuck minus 7 hours. I have tried deleting the gmaptz.img file but when reconnecting the 520 to Garmin Connect the file is not being 'rebuilt' as I was led to believe it would be. I've tried a factory reset but the problem persists. If I replace the gmaptz file (dragged to desktop) and restart the 520 the problem remains. Any ideas how I'm supposed to 'rebuild' the new file or is there a link to download a new gmaptz.img? Cheers in advance.