ASA Electronics AirClassic E6-B - Wind Calculations and Usage; The Crosswind Table

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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