public static void setMapCenter(final GeoPointImpl mapViewCenter) {
        if (mapViewCenter == null) {
            return;
        }
        putInt(R.string.pref_lastmaplat, mapViewCenter.getLatitudeE6());
        putInt(R.string.pref_lastmaplon, mapViewCenter.getLongitudeE6());
    }
@return zoom used for the map of a single cache
main/src/main/java/cgeo/geocaching/settings/Settings.java