VERT_CS["St. Helena Tritan 2011 height",
    VERT_DATUM["St. Helena Tritan Vertical Datum 2011",2005,
        AUTHORITY["EPSG","1176"]],
    UNIT["metre",1,
        AUTHORITY["EPSG","9001"]],
    AXIS["Gravity-related height",UP],
    AUTHORITY["EPSG","7889"]]