VERTCRS["St. Kilda height",
    VDATUM["St. Kilda"],
    CS[vertical,1],
        AXIS["gravity-related height (H)",up,
            LENGTHUNIT["metre",1]],
    USAGE[
        SCOPE["Geodesy, engineering survey."],
        AREA["United Kingdom (UK) - Great Britain - Scotland - St Kilda onshore."],
        BBOX[57.74,-8.74,57.93,-8.41]],
    ID["EPSG",5747]]