/usr/share/metview/etc/GribVectorsDef is in metview-data 4.8.0-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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{
   TYPE
   {
      VECTOR_FIELD
      POLAR_FIELD
   } = VECTOR_FIELD
   U_COMPONENT
      [ interface = icon, class = GRIB , exclusive = true,
        help = help_data,help_directory  = '/System/Defaults',
        help_name       = U component for Vectors,
        help_class      = RETRIEVE,
        help_definition = ( RETRIEVE,  LEVTYPE = PL,
                            LEVELIST = 1000, PARAM = U,
                            DATE = '-1', GRID = 1.5/1.5 )
      ]
   { @ }
   V_COMPONENT
      [ interface = icon, class = GRIB , exclusive = true,
        help = help_data,help_directory  = '/System/Defaults',
        help_name       = V component for Vectors,
        help_class      = RETRIEVE,
        help_definition = ( RETRIEVE,  LEVTYPE = PL,
                            LEVELIST = 1000, PARAM = V,
                            DATE = '-1', GRID = 1.5/1.5 )
      ]
   { @ }
   INTENSITY
      [ interface = icon, class = GRIB ,
        help = help_data,help_directory  = '/System/Defaults',
        help_name       = Intensity for Vectors,
        help_class      = RETRIEVE,
        help_definition = ( RETRIEVE, TYPE = AN,
                            STREAM = WV, LEVTYPE = SFC,
                            REPRES = LL, PARAM = SWH,
                            DATE = '-1', GRID = 1.5/1.5 )
      ]
   { @ }
   DIRECTION
      [ interface = icon, class = GRIB ,
        help = help_data,help_directory  = '/System/Defaults',
        help_name       = Direction for Vectors,
        help_class      = RETRIEVE,
        help_definition = ( RETRIEVE, TYPE = AN,
                            STREAM = WV, LEVTYPE = SFC,
                            REPRES = LL, PARAM = MWD,
                            DATE = '-1', GRID = 1.5/1.5 )
      ]
   { @ }
   COLOURING_FIELD
      [ interface = icon, class = GRIB,
        exclusive = true,
        help = help_data,
        help_directory  = '/System/Defaults',
        help_name       = Colouring field,
        help_class      = RETRIEVE,
        help_definition = ( RETRIEVE, LEVTYPE = PL,
                            LEVELIST = 1000, PARAM = T,
                            DATE = '-1', GRID = 1.5/1.5 )
      ]
   { @ }
}
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