71 50_Afficheur_Multigraphic_um_UK_27
2.14.2.1
True wind angle table
The true wind angle table allows correction of the true wind angle value without
researching the causes of angle’s errors. It corrects all repeatable errors (twist, flow
over-speed downwind, sensor).
The true wind data is calibrated by logging the true wind direction differences from
one tack to another repeatedly. It is recommended that these calibration sessions are
run from 5 to 50 knots in winds that are stable in direction.
TWD port tack > TWD starboard tack:
Add half of the difference between the two True Wind Directions.
Select the value to be corrected.
Modify the value.
The column on the left indicates the true wind speed in knots, the “V1” column is the
correction to apply in degrees and the “A1” column indicates on which angle the
correction will apply. The same pattern applies for “V2” and “A2” for sidewind and
“V3” “A3” for downwind.
10°
45°
45°
Port tack
TWD 260°
Starboard tack
TWD 250°
Heading 300°
Heading 210°
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