private void setMapRotation(final MenuItem item, final int rotation) {
        Settings.setMapRotation(rotation);
        if (null != overlayPositionAndScale) {
            overlayPositionAndScale.updateMapRotation();
        }
        item.setChecked(true);
    }
Set the zoom of the map. The zoom is restricted to a certain minimum in case of live map.
main/src/main/java/cgeo/geocaching/maps/CGeoMap.java