Do you want to check maps when there's no mobile network, in an airplane or roaming to foreign countries without unlimited data service? This is specially designed for such situations. The built-in Beijing, Shanghai and Guangzhou maps are accessible without generating any data traffic.
Each map provide a full view and a detailed view. In both views mult-touch gestures are supported for scrolling and zooming.
GPS locating function and maps of more cities will be added soon.