District of Columbia USGS topo maps

Cartahaven has 4 USGS topo maps of District of Columbia, all free. These are the current USGS US Topo 7.5-minute (1:24,000) quadrangles: contours, roads, trails, streams and place names, each a GeoPDF.

Download one to your phone and the map app shows your GPS position on it with no cell signal.