private static void addRingToGeoBuilder(final GeomBuilder gb, final List<Geopoint> ring) {
        for (Geopoint pt : ring) {
            final GeoPoint gpt = GP_CONVERTER.to(pt);
            gb.point(gpt.getLongitude(), gpt.getLatitude());
        }
        gb.ring();
    }
mimics {@link #removeItem(MarkerInterface)} but w/o calling 'populate'
main/src/main/java/cgeo/geocaching/unifiedmap/geoitemlayer/MapsforgeVtmGeoItemLayer.java