COMPOUNDCRS["RGM23 / UTM zone 38S + IGN 2023 Mayotte height",
    PROJCRS["RGM23 / UTM zone 38S",
        BASEGEOGCRS["RGM23",
            DATUM["Mayotte Geodetic Reference Frame 2023",
                ELLIPSOID["GRS 1980",6378137,298.257222101,
                    LENGTHUNIT["metre",1]]],
            PRIMEM["Greenwich",0,
                ANGLEUNIT["degree",0.0174532925199433]],
            ID["EPSG",10671]],
        CONVERSION["UTM zone 38S",
            METHOD["Transverse Mercator",
                ID["EPSG",9807]],
            PARAMETER["Latitude of natural origin",0,
                ANGLEUNIT["degree",0.0174532925199433],
                ID["EPSG",8801]],
            PARAMETER["Longitude of natural origin",45,
                ANGLEUNIT["degree",0.0174532925199433],
                ID["EPSG",8802]],
            PARAMETER["Scale factor at natural origin",0.9996,
                SCALEUNIT["unity",1],
                ID["EPSG",8805]],
            PARAMETER["False easting",500000,
                LENGTHUNIT["metre",1],
                ID["EPSG",8806]],
            PARAMETER["False northing",10000000,
                LENGTHUNIT["metre",1],
                ID["EPSG",8807]]],
        CS[Cartesian,2],
            AXIS["(E)",east,
                ORDER[1],
                LENGTHUNIT["metre",1]],
            AXIS["(N)",north,
                ORDER[2],
                LENGTHUNIT["metre",1]]],
    VERTCRS["IGN 2023 Mayotte height",
        VDATUM["IGN 2023 Mayotte"],
        CS[vertical,1],
            AXIS["gravity-related height (H)",up,
                LENGTHUNIT["metre",1]]],
    USAGE[
        SCOPE["Geodesy, engineering survey, topographic mapping."],
        AREA["Mayotte - onshore."],
        BBOX[-13.05,44.98,-12.61,45.35]],
    ID["EPSG",12209]]