Nav Computer: Centre dot on top of square grid, wind direction (180ºM) under HEADING index and mark wind speed 30 kts down from centre dot.  

Rotate to put runway direction (227ºM) under HEADING index and read the cross wind component to right of centre line (22 kts).

Calculator:  Wind speed (30 kts) x sin47º (angle between wind direction and runway alignment = 227º - 180º = 47º): 30 x 0.731 = 21.93.