DAVIS Vantage Pro2 Sensor Suite User Manual page 29

Orient the Wind Vane
The wind vane rotates 360° to display current and dominant wind directions on the
compass rose of the console display. To obtain accurate readings, the vane must be
correctly oriented when mounting the anemometer. The wind vane is factory-
calibrated to report the correct wind direction if the anemometer arm points true
north.
To ensure correct wind direction data, mount the anemometer so that the arm points
true north.
If your anemometer arm cannot be mounted aiming true north, you will need to
calibrate the wind direction on your console to display accurate wind directions. See
your Vantage Pro2 Console User Manual.
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