VERTCRS["BGS2005 height",
    VDATUM["Bulgarian Height System 2005"],
    CS[vertical,1],
        AXIS["gravity-related height (H)",up,
            LENGTHUNIT["metre",1]],
    USAGE[
        SCOPE["Geodesy, engineering survey, topographic mapping."],
        AREA["Bulgaria - onshore."],
        BBOX[41.24,22.36,44.23,28.68]],
    ID["EPSG",9669]]