PROJCS["Sister Islands National Grid 1961",
    GEOGCS["SIGD61",
        DATUM["Sister_Islands_Geodetic_Datum_1961",
            SPHEROID["Clarke 1866",6378206.4,294.978698213898],
            TOWGS84[8.853,-52.644,180.304,0.393,2.323,-2.96,-24.081]],
        PRIMEM["Greenwich",0,
            AUTHORITY["EPSG","8901"]],
        UNIT["degree",0.0174532925199433,
            AUTHORITY["EPSG","9122"]],
        AUTHORITY["EPSG","4726"]],
    PROJECTION["Transverse_Mercator"],
    PARAMETER["latitude_of_origin",0],
    PARAMETER["central_meridian",-81],
    PARAMETER["scale_factor",0.9996],
    PARAMETER["false_easting",1640419.9475],
    PARAMETER["false_northing",0],
    UNIT["foot",0.3048],
    AXIS["Easting",EAST],
    AXIS["Northing",NORTH],
    AUTHORITY["EPSG","6129"]]