Map app

Map app is an offline map of the plateau and cave entrances. Fundamentally it is a website, which can be downloaded as a zip file. Once downloaded it can be extracted to somewhere on your phone.
Now we need to host the website on your phone, in a way that your browser will trust the website to geolocate you. On android this can be done using simpe HTTP server. Open firefox and navigate to http://127.0.0.1:8080/index.html or http://localhost:8080/index.html (If you are genuinely offline, chrome stops access to 127.0.0.1, hence firefox is recomended instead)