Google Maps adds error reporting — clicking on “report a problem” at the bottom right of the map opens a dialogue where you can place a pushpin and describe the problem. “Once we’ve received your edit or suggestion we’ll confirm it with other users, data sources, or imagery. We hope to resolve each edit within a month. If you submit your email address, we’ll even keep you posted on our progress,” says Google LatLong. This is a vast improvement: until today, if you found an error on an online map — and I found a bunch of them locally when Google switched its North American mapping data from Navteq to Tele Atlas a year ago — the only thing you could do was report the error to the mapping data provider. This is much handier; I’ve already reported a bunch of the errors I pointed out last year.