On Nav Computer: to find TAS; in the AIRSPEED
window put temperature (-10ºC) next to pressure altitude (FL100), go to CAS
(150kts) on the inner main scale and read TAS next to it on the outer main
scale: 173 kts.
On the other side put centre dot over TAS (173 kts),
rotate to put wind direction (240ºT) under the HEADING index and mark wind
speed 30 kts below centre dot (over 143 kts).
Rotate to put track (330ºT) under HEADING index and note drift is 10º Stbd (right).
Rotate to put track (330ºT) under drift (10º Stbd).
On a heading of 320ºT the 10º Stbd drift gives
the required track, 330ºT.
Heading 320ºT, variation 17ºW, heading 337ºM.
Groundspeed, under the wind mark, is 171 kts
and a distance of 275nm will be covered in 97 minutes.
If the time at J is 1245 the ETA at B is 1422.