The Crosswind Table
To determine headwind, tailwind or crosswind component quickly and easily, you must know the angle between your course and the reported wind direction. You also must know the reported wind velocity. This will be especially helpful in anticipat- ing the effect of wind when landing, because wind reported by a tower, flight service station, or ATIS is surface wind. These reports give wind direction in relation to magnetic north and can be compared to your airplane’s heading indicator without correc- tion. If you use the table with winds aloft, remember that those winds are reported in relation to true north and you must apply variation before comparing them to the heading indicator.
Figure 20
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