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.