the wind vector is true wind direction and speed provided by the ADIRS. when departing on a runway equipped with an ILS this freq is auto-tuned. when take-off power is set and no trk/hdg preselected, the aircraft track can be seen on the ND at 30kts as a yaw bar ( the LOC)and 'RWY' on the FMA, so I guess the a/c is tracking magnetically along the runway with a true wind indication courtesy of ADIRS.
FLYJETS, not sure what you mean-hope this helps: avionics cooling;
Once takeoff power is selected, the inlet and extract valves close (closed configuration)with avionics cooling coming from the a/c airconditioning.