B&G Deckman - Manual (Page 108)

WTP system
7.3
The way the WTP handles wind calculations is the second major
difference. Starting from the measured wind speed and angle at the
masthead, the WTP incorporates data from sensors for measuring the
pitching and rolling of the boat. It is from this corrected wind
information that the true wind direction and speed are calculated. The
WTP then goes backwards through these calculations, coming up with
its own, more accurate, values for both the true and apparent wind speed
and angle. All of this may sound somewhat excessive but it is found that
calculations done in this way reflect much better the changes that are
really taking place.
Because the wind calculations are all made from the true wind
information, it is only this that needs to have damping values entered
through Deckman.
Figure 7.2