B&G Deckman - Manual (Page 146)

GRIB routing
9.19
Firstly, this is the format in which files are saved when you create your
own forecasts using the make Grid function (see above).
Secondly, GRIBs will be automatically converted to this format if they
have been viewed in the GRIB viewer, in which case the file will have
been split up into sections of different data:
Current filename_c.cgf
Wave height
filename_h.cgf
Temperature filename_t.cgf
Pressure filename_p.cgf
Wind filename_w.cgf
Thirdly, files are automatically converted to this format if you open and
then save them in the GRIB.exe program (see above).
GRIBS in Planning
Run Deckman in the normal way. Select menu>planning>setup plan
and then use GRIB wind forecast and/or use current GRIB. Click on
wind file or current file button and choose which GRIB file to use and
confirm by choosing Open. Remember the file must be in the form
readable by Deckman with the .cgf extension. Set up the rest of the plan
as you would normally—if necessary see page 3.14 for a reminder.
In the same way as it is advisable to input various different scenarios
into What If? and Planning, it is also possible to change the GRIB
forecasts as necessary. On longer passages, especially, this is a useful
function; for instance if you hear new weather information but can't
access updated GRIB files.
Editing GRIB data
By choosing the edit GRIBs icon (shown left) you can make some
changes to the GRIB files: offsetting the forecasts or changing the
timings for example. For any changes made here Deckman will
automatically update the Planning function, immediately showing you
the new set of isochrones.