The Navigation Computer: Calculation of Wind Components
Take the following example:-
ATIS W/V 310/30
Firstly, using the ‘graph paper’ part of the Navigation Computer scale at the bottom of the slide, plot the wind velocity in the normal way.
Now rotate the wind disc to put the runway QDM of 270 at the 12 o’clock index.
Now read vertically ‘down’ the y-axis. This gives you the headwind component. In this example it is 23 knots headwind.
Read across from the centre line (the x-axis). This gives you the crosswind component. In this example it is 19 knots crosswind (from right to left).