Drift & Navigation Physics
By adding the True Airspeed Vector (TAS) and the Wind Vector head-to-tail, we obtain the resultant Ground Speed Vector (GS). The angle between TAS and GS is your Wind Correction Angle (WCA).
Your Heading (078°) differs from your Track (090°) by 12°. Never confuse them! Procedures are often defined by Tracks (TRK), but you fly a Heading (HDG).