Nav Computer: Centre dot on TAS (200 kts), rotate to put wind direction (210šT) on HEADING index
and mark wind on centre line 20kts below centre dot (over 180 kts).
Rotate to put track 073šT next to
HEADING index; read drift (4š left (Port)) and rotate to put track (073š) under
drift (4šPort). On heading 077šT the drift 4šPort will give the
required track, 073šT and the groundspeed is under wind mark: 214 kts.