Barcelona Integrated Fare System Zone Calculator and Auto-Updating Metro and Tram Maps app for iPhone and iPad

Main Features:
Calculate the number of zones between destinations under the "Integrated Fare System" by using an intuitive calculator!
This app includes zoomable diagrams for the Barcelona Metro, Trambaix & Trambesòs. The maps are in Spanish but easily readable by an English speaker.
Maps work underground even if there is no connection to the internet!
The maps will automatically update when a newer map is avaiable (requires network connection).
The maps are given the entire screen! We dont use tabbed views and other navigation mechanisms that take up valuable real estate. A costom slide-out menu design is used.
Smooth scrolling and zooming

Other features:
Pinch to zoom in and out
Double-tap to zoom in by a factor of 2
At full zoom, double-tap to zoom out by a factor of 8
The map initially opens at an optimal position
When the map is seen in its entirety by fully zooming out, the full view is preserved under orientation changes.