You can use OruxMaps for your outdoor activities. It is an Online and offline map viewer. With this app you can use different map formats, like GeoPDF from USGS store, GeoTIFF maps, ozf2, img garmin mbtiles, and others. Online maps: You can use the application as a WMS and WMTS online map viewer. Download online maps for offline use.
Jose vazquez is the developer of the app that can be found in the Travel & Local category. OruxMaps GP has been downloaded and set up by over 100K users and the most recent update was released on Oct 1, 2020. The tool has been rated 4.5 on Google Play.