VERTCRS["Douglas height",
    VDATUM["Douglas"],
    CS[vertical,1],
        AXIS["gravity-related height (H)",up,
            LENGTHUNIT["metre",1]],
    USAGE[
        SCOPE["Geodesy, engineering survey."],
        AREA["Isle of Man - onshore."],
        BBOX[54.02,-4.87,54.44,-4.27]],
    ID["EPSG",5750]]