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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).