Windows Phone 8 users have the option of downloading maps to their local storage for offline use.
It seems that mapping data has now been refreshed, making it a good idea to check for an update on your phone and download the latest data.
To check for updated maps go to Settings> Applications> Maps> Check for Updates.
It is difficult to say what’s new, but the download was slightly bigger than the currently installed maps, suggesting some more detail has been added. Traffic info also appeared to show up better.