Nav Computer: Centre dot on TAS (460 kts), rotate to put wind direction (360ºT) on HEADING index and mark wind on centre line 100kts below centre dot (over 360 kts).  

Rotate to put track 090ºT next to HEADING index; read drift (12º right (Stbd)) and rotate to put track (090º) under drift (12ºStbd).  

Drift has now changed to 13ºStbd so put track 090º under 13ºStbd.  

On heading 077ºT the drift 13ºStbd will give the required track, 090ºT. 

Heading 077ºT,  variation 10ºE = heading 067ºM, deviation -2ºW = heading 069ºC. 

 The groundspeed is under wind mark: 169 kts.