VERTCRS["BGS2005",
    VDATUM["Bulgaria_Geodetic_System_2005"],
    CS[vertical,1],
        AXIS["ellipsoidal height (h)",up,
            LENGTHUNIT["metre",1]],
    USAGE[
        SCOPE["Not known."],
        AREA["Bulgaria - onshore and offshore."],
        BBOX[41.24,22.36,44.23,31.35]],
    ID["ESRI",115806]]