float lat = getTransformer().lat(y);
float lon = getTransformer().lon(x);
MapNode mark = new Position(lat, lon).selectNearest(marks, null);
if (mark != null)
marks.remove(mark);
map.fireMapDataEvent(new MapEvent(map,
MapEvent.Type.MAP_MODIFIED));
fireMapViewEvent(new MapViewEvent(this,
MapViewEvent.Type.TMP_NODES_REMOVED));
}