The difference between magnetic and compass is deviation.

Positive deviation or variation is Easterly.

C-----D----M----V----T
200 +1(E) 201 31W 170

Find the heading in degrees TRUE by using the deviation and variation - see above (170).

Drift is from Heading TO Track, and Heading is calculated (from CDMVT) as 170ºT, therefore Drift = 10º Right (or Starboard, depending on your type of Whizz Wheel).

So the drift is 211degrees (from the VOR radial) – 201degrees (magnetic from above) = 10degrees STBD.

Get the whizz wheel out. Centre dot on the TAS (390), TRUE heading (170) set at the top of the wheel and then put a mark on the drift of 10degrees STBD (211 - 201) at a G/S of 360 kts.

Rotate so the mark is under the dot and read out TRUE wind direction and speed...