VERTCRS["NIVELLEMENT GENERAL DE MARE (IGN 1991 MR)",
    VDATUM["NIVELLEMENT GENERAL DE MARE (IGN 1991 MR)"],
    CS[vertical,1],
        AXIS["gravity-related height (H)",up,
            LENGTHUNIT["metre",1]],
    USAGE[
        SCOPE["LOCALE A CARACTERE LEGAL"],
        AREA["MARE (ILES LOYAUTE)"],
        BBOX[-21.69,167.69,-21.29,168.18]],
    ID["IGNF","MARE91"]]