Nav Computer: Centre dot on TAS (90 kts), rotate to put wind direction (120ºT) on HEADING index and mark wind on centre line 20kts below centre dot (over 70 kts).

Rotate to put heading 355ºT next to HEADING index; read drift and groundspeed under wind mark: 9º Port (left) (track 346ºT) and 102 kts.