VERTCRS["Guam 1963 height",
    VDATUM["Guam Vertical Datum of 1963"],
    CS[vertical,1],
        AXIS["gravity-related height (H)",up,
            LENGTHUNIT["metre",1]],
    USAGE[
        SCOPE["Geodesy, engineering survey, topographic mapping."],
        AREA["Guam - onshore."],
        BBOX[13.18,144.58,13.7,145.01]],
    ID["EPSG",6639]]