Avare

Avare is a free open source "moving map" aviation GPS, A/FD and EFB app for phones or tablets using the Android Operating System. The app uses any internal Android or compatible external GPS receiver to determine location, allowing real-time display of location, heading, speed, distance, time, and altitude on free U.S. FAA IFR or VFR aviation charts; or on select topographic charts. Included are 3... (Wikipedia)