Geographica is a free offline GPS app designed for mountaineering. It allows you to view and store map images on your device, making them accessible even without internet or mobile phone signal. The app comes with several types of maps, including OpenStreetMap, and can be used as a GPS logger. You can create markers and use the navigation function to guide you through routes. The app also supports UTM coordinate format and has a speech function that announces time, coordinates, speed, and more.

One of the best features of Geographica is its ability to cache maps offline, which is essential for outdoor enthusiasts who need to navigate through remote areas. The app's accuracy, reliability, and usefulness are not guaranteed by the developer, so use at your own risk. It is compatible with Android OS 4.4 or later and requires GPS, e-compass, and accelerometer. It is important to note that continued use of GPS running in the background can significantly decrease battery life.