B&G Deckman - Manual (Page 174)

User variables
12.15
number 7 represents true wind direction, if you look further towards the
top of the list in the [variables] section of j_varsXX.d. Also in the line
above we can see that the new variable has no calibration file (shown by
null.cal) and a filtering file named MA_TWD.fil.
All that remains now is to create the relevant filtering and calibration
files.
Filtering
A subdirectory of your data directory is called filters. In here you must
create the filtering files which you specified in the [UserVariables]
section.
The filtering file will usually contain two numbers: the first is the type
of filtering (see table below),while the second (and occasionally third)
defines the filtering.
Filtering
function Damping type Other numbers (or notes)
1 Ordinary
exponential
Inverse of required damping
time in secs/5
2 Exponential,
for 360°
Inverse of required damping
time in secs/5
3 Exponential,
for 180°
Inverse of required damping
time in secs/5
4 two term
Kalman filter
(refer to B&G)
5 band pass -
mainly for rate
gyros (refer to B&G)
6 k term
moving
average
Calculates a moving average
(see below)
7 3rd order
Chebyshev
Damping in secs