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 some where 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 HTTP simple server.
Open chrome and navigate to http://127.0.0.1:8080/index.html
- Click on Root folder and point at the folder where you extracted the zip file.
- Tick "Redirect to index.html if present"
- Tick "Restrict network interfaces", then select untick everything apart from "lo 127.0.0.1"
- Pres the "START" button