Key features: 1. Offline maps from official sources. 2. Usable even no internet connection and Wi-Fi lost. 3. Can zoom in, zoom out and scroll vertical and horizontal. 4. Easy to use. Quick to find your place. 5. Without charge. 6. Bookmark and customize maps and web pages by yourself. 7. Local guide and local foods guide. This app includes: 1.MBTA SUBWAY 2.MBTA BUS MAP 3. MBTA COMMUTER RAIL MAP 4. MBTA FERRY ROUTE MAP 5. BOSTON TRAVEL GUIDE BOOK