public static boolean brouterAutoTileDownloadsNeedUpdate() {
        return needsIntervalAction(R.string.pref_brouterAutoTileDownloadsLastCheck, getBrouterAutoTileDownloadsInterval() * 24, () -> setBrouterAutoTileDownloadsLastCheck(false));
    }
The threshold for brouter routing (max. distance)
main/src/main/java/cgeo/geocaching/settings/Settings.java