FLC OF A WDB FAILED TO TURN TO THE DEP HDG AFTER TKOF DUE TO THE ACFT COMPASSES NOT SLAVED TO THE APPROPRIATE HDG AND THE FLT DIRECTOR MODE WAS ON ATTITUDE INSTEAD OF THE NAV MODE.

Narrative

MAINT WAS ON THE ACFT WHEN THE FE ARRIVED TO START HIS PREFLT. THE MECH WAS WORKING ON THE CAPT'S FLT DIRECTOR; SAID THE HORIZ PITCH TRIM WAS STICKING. THE MECH FURNISHED UP AND TOLD THE FE HE WOULD LEAVE THE INS'S ON SINCE HE ALREADY HAD THEM ALIGNING. HOWEVER; THE MECH HAD ONLY TURNED THE INS'S ON TO 'ALIGN' INSTEAD OF 'NAV' WHICH IS ACR X PROC. AS A RESULT; THE FLC DID NOT NOTICE THIS UNTIL PUSHBACK; AT WHICH TIME THE INS'S BEGAN FLASHING. THE CAPT REALIZED WHAT HAPPENED AND SWITCHED BOTH INS'S TO 'ATTITUDE REF' ELECTING TO GO WITHOUT THE INS RATHER THAN WAIT FOR THEM TO RE-ALIGN; SINCE WE WERE ONLY GOING MSP TO ORD; A HDG OF 118 DEGS WAS SET WITH THE HDG BUG AS PER PROC FOR RWY 11R AT MSP. ON TKOF; TWR SAID TO FLY HDG 110 DEGS. THE CAPT RESET THE HDG BUG WHILE I (FO) WAS FLYING. I LOOKED AT 110 DEGS ON THE COMPASS AND TURNED APPROX 30 DEGS S TO ROLLOUT ON 110 DEGS; TWR CALLED AND SAID TO FLY HDG 110 DEGS; THAT THEY OBSERVED US GOING WELL S. CHKING THE STANDBY COMPASS WAS NOT RECHKED IN THE TURN BUT; THE CAPT RE-SLAVED THE COMPASS AND I TURNED BACK L TOWARDS 110 DEGS; LEVELING AT 500 FT MSL. FACTORS: THE FLC SHOULD HAVE NOTICED THE INS WERE NOT ON 'NAV' DURING PREFLT; THE CAPTS SHOULD HAVE NOTICED DURING THE BEFORE START CHKLIST WHEN HE CALLED OUT INS'S 'NAV AND CHKED.' AFTER SELECTING 'ATTITUDE REF' WHICH IS NOT A NORMAL PROC THE COMPASSES SHOULD HAVE BEEN SLAVED AGAIN BUT WERE NOT. WHEN TAKING THE RWY FOR TKOF; BOTH PLTS SHOULD HAVE NOTICED THE COMPASS HDG WAS NOT ALIGNED WITH THE RWY HDG. DUE TO HURRYITIS; FATIGUE; COMPLACENCY; AND INATTN TO DETAIL THIS CHAIN OF EVENTS WENT UNBROKEN.