This geoclue plugin provides position updates based upon cell tower signal strength data. It looks up the location of nearby cell towers from the Mozilla Location Services Database file which is shipped on the device, and does a crude triangulation to determine the likely position of the device. To get debug output from the plugin, run it via: QT_LOGGING_RULES="*.debug=true" devel-su -p /usr/libexec/geoclue-mlsdb