One of the unsung features of Apple's iOS 6 Maps app is that it uses vector-based -- rather than raster-based -- maps that chew up less bandwidth and can be stored in a much smaller amount of memory. Many iOS 6 users are now finding that they can actually use the Maps app without a data connection, provided that they've "visited" the areas of interest while online to pre-cache a lot of the map information.
The main difference between vector and raster maps is that vector maps are mathematically described and resolution independent, while raster maps are essentially simple flat images that are loaded into a map app. Using the mathematical description of locations allows Apple's Maps app to
