GPS Track Viewer allows you to view KML, KMZ, GPX, CSV and NMEA files on a Google Map. It supports Standard, Terrain, Satellite and Hybrid mode. The app registers for the supported file types and can be selected in all popular file managers as viewer. The following extensions / formats are supported: - KML & KMZ - GPX - CSV (Latitude and Longitude columns needed) - NMEA and TXT The app allows to open up to 10 tracks for free, afterwards it will ask you to buy the app.