Section 6 - Code Table 0 : Bit Map Indicator

Code Meaning
0 A bit map applies to this product and is specified in this Section
1 - 253 A bit map pre-determined by the originating/generating Centre applies to this product and is not specified in this Section.
254 A bit map defined previously in the same "GRIB" message applies to this product.
255 A bit map does not apply to this product.