If you’ve updated your iPhone, iPad or iPod Touch to iOS 6, you’ll find the Maps app uses new data. It is likely that if you have local knowledge, you find errors and missing information. The new data is much less comprehensive than the Google Maps data the app used until now.
Eventually errors will be fixed and many more points of interest will be added. To speed the process, Apple have included ways for us to submit information and corrections.
Points of interest shown at incorrect location
If you see that a business, park, station, hospital or other point of interest is shown at an incorrect location, you can send Apple the correct location.
Tap the blue right-facing arrow to see point of interest details.