Centre dot on TAS (275kts).

Heading 077šT on HEADING index.

Heading 077šT, track 086šT; drift = 9šStbd.

Mark where 9šStbd crosses groundspeed 288kts.

Rotate to put mark below centre dot on centreline.

Read W/V: I get 345šT/46kts.

Always use the low speed side when TAS/groundspeed are 300kts or less and drift is within limits; it is far more accurate than the bottom end of the high speed side.