(Submitted for US only) If you don't live in Washington D.C. then you'll surely visit. These maps are for resident and visitor alike. Pan & Zoom the DC Metro map, DC Bus maps (Central and Pentagon area), the Baltimore Metro maps,and the Maryland Marc and Maryland Light Rail maps. The maps are built into the application and available when you need maps the most. When you're underground. No wifi or 3g necessary. New version available - faster pan and zoom!