VERTCRS["Sule Skerry height",
    VDATUM["Sule Skerry"],
    CS[vertical,1],
        AXIS["gravity-related height (H)",up,
            LENGTHUNIT["metre",1]],
    USAGE[
        SCOPE["Geodesy, engineering survey."],
        AREA["United Kingdom (UK) - Great Britain - Scotland - Sule Skerry onshore."],
        BBOX[59.05,-4.5,59.13,-4.3]],
    ID["EPSG",5744]]