4006=GEOGCS["Unknown datum based upon the Bessel Namibia ellipsoid (deprecated)",DATUM["Not_specified_based_on_Bessel_Namibia_ellipsoid",SPHEROID["Bessel Namibia (GLM)",6377483.86528042,299.1528128,AUTHORITY["EPSG","7046"]],AUTHORITY["EPSG","6006"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4006"]]