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2
CALIBRATION
The masthead unit is adjusted at the factory. However, a calibration is required to adapt the
sensor to the specificities of your boat and to obtain an optimum measurement accuracy. Follow
the calibration procedure below, by visualising the settings on a display: please refer to the user
guide of the display.
2.1 CALIBRATION OF THE WIND VANE
2.1.1 Principle of the calibration
After the masthead unit has been installed, a real test at sea needs to be carried out. You will
sail on port tack and on starboard tack in order to raise the wind angle displayed on the channel
APP WIND ANGLE. Then, you will deduce the offset value which will enable you to adjust the
wind vane. Thus, a calibration rectifies all the shifts that result from an installation at the head of
mast : assembly position (alignment), torsion and inflection of the mast during navigation.
Note that each wind vane is set with a factory offset. This offset ranges between 0° and -180° or
between 0° and +180°. It is the reference of your wind vane in relation to the axis of the support
stem. Before the start of a calibration, we recommend that you make a note of this value as it
may be useful in case of bad handling.
2.1.2 OFFSET setting procedure
To achieve a successful calibration, sail on a calm sea, with a moderate wind.
1. Display the channel APP WIND ANGLE.
2. Sail and follow several close-hauled tacks : note the values of apparent wind angle displayed.
3. Calculate the average of the values displayed on starboard tack and those displayed on port
tack.
4. Calculate the offset correction :
5. Adjust the factory offset with the value of offset calculated
Example 1 :
Factory OFFSET = 60
Average apparent wind angle starboard tack :45°
Average apparent wind angle port tack :35°
Value to be added to the factory OFFSET = (45°-
35°) / 2 = 5 °
New offset value = 5 +60 = 65
( average starboard angle - average port angle).
Example 2 :
Factory OFFSET = 60
Average apparent wind angle starboard tack :39°
Average apparent wind angle port tack :45°
Value to be deducted from the factory OFFSET =
(39°- 45°) / 2 = - 3 °
New offset value = 60-3= 57
6
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