VV -- Visibility
      90 --  0.00 km <= VV <   0.05 km
      91 --  0.05 km <= VV <   0.20 km
      92 --  0.20 km <= VV <   0.50 km
      93 --  0.50 km <= VV <   1.00 km
      94 --  1.00 km <= VV <   2.00 km
      95 --  2.00 km <= VV <   4.00 km
      96 --  4.00 km <= VV <  10.00 km
      97 -- 10.00 km <= VV <  20.00 km
      98 -- 20.00 km <= VV <= 50.00 km
      99 -- 50.00 km <  VV
      // -- missing