Nav Computer: Centre dot on TAS (198 kts), rotate to put wind direction (359ºT) on HEADING index and mark wind on centre line 25kts below centre dot (over 173 kts).

Rotate to put heading 180ºT next to HEADING index; read drift and groundspeed under wind mark: 0º Port/Stbd (track 180ºT) and 223 kts.   

It should be noted that this is a 25 kt tailwind.