Except where the direction of the wind at an aerodrome can be determined by radio or other means such as smoke movement in the air or wind lines on water, the operator of the aerodrome shall install and maintain at the aerodrome a wind direction indicator.

A wind direction indicator must be of a conspicuous colour or colours, illuminated at night, in the shape of a truncated cone and visible to aircraft flying at an altitude of 1,000 feet.

A wind direction indicator must also conform to the following requirements:

At aerodromes that do not have prepared runways, the wind direction indicator is usually mounted on or near some conspicuous building or in the vicinity of the general aircraft parking area.
Runways greater than 1,200 metres in length will have a wind direction indicator for each end of the runway. It will be typically located adjacent to the touchdown zone, 60 metres outward from the edge of the runway, and clear of the obstacle free zone.
Runways 1,200 metres in length and shorter will have a wind direction indicator located centrally on the aerodrome or near each end of the runway, typically positioned in proximity to the aiming point markings.

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References

AIM AGA 5.9 – Wind Direction Indicators
CAR 301.06 – Wind Direction Indicator

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