Two methods of aligning the vane are available. The first method involves loosening the large set screw at the bottom
of the wind direction sensor so that it will rotate on the U-arm. Turn the bottom half of the sensor until the compass
readings and the indication match then retighten the set screw. The second method involves rotating the entire mast
assembly until proper orientation is achieved; this technique is usually easier because of the heights involved but will
usually necessitate repositioning (rotating) of the guy-wire clamp.
If winds are creating rapid fluctuations in the vane making calibration difficult, the vane can be temporarily secured in
a fixed position by carefully wedging a thickly folded piece of paper or cardboard into the gap between the upper and
lower halves of the direction sensor. An alternative technique is to lap a string over the vane and carefully hold it in
position (be careful not to bend the vane when using this approach).
