B&G Deckman - Manual (Page 147)

Chapter 9: Wind and current forecasts
9.20
In the Edit GRIBs box, an example of which is shown in Figure 9.14,
you first specify which forecast you wish to change. You then have the
following options available:
lat. offset and long. offset allow you to specify offsets for the forecast
map; units as before: lat/long in degrees and decimals of a degree,
positive being East and North.
time offset allows you to see the effects of the weather systems moving
more quickly or slowly than in the original forecast. Units are hours
here.
rotate degrees input a rotation angle for the entire forecast map in
degrees, with positive being clockwise.
scale allows you to change the winds by a percentage— for example, to
increase the winds by 20%, input 120 into this box.
The Link boxes here allow you to make the specified changes to all of
the forecasts, not just the one where you input the changes initially.
Figure 9.14
Figure 9.15