B&G Deckman - Manual (Page 145)

Chapter 9: Wind and current forecasts
9.18
GRIB routing
Note. This feature will only work if you have obtained the correct
unlock code; if you attempt to use this feature without the code, you will
be prompted to enter it. If you already have the code enter it here, or
contact your agent or B&G for further information.
GRIB conversion
In order to be used in Deckman, GRIBs must be in a special format
(which is indicated by the file extension .cgf). There are three ways in
which you may create or convert files into the .cgf format.
Figure 9.13