On the Nav Computer: Centre dot on top of square grid.  

Put wind direction (100ēM) under the HEADING index and draw a line down the centre line from the centre dot.  

Put runway direction (063ēM) under the HEADING index and mark the 20 kt crosswind component to cross the wind line.  

Rotate to put the wind direction (100ēM) under the HEADING index and read wind speed which will give 20 kt cross wind (33 kts).