AN MDT CORP JET FLC EXPERIENCES A FLC DEV OF A HDG TRACK DEV IN A NIGHT OP. ALERT ARTCC RADAR CTLR GIVES THEM A WAKEUP CALL.

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WHILE ON A NIGHT FLT TO ATLANTA; GA; I WAS IN THE R SEAT TO GIVE ACFT CURRENCY TO AN INDIVIDUAL. WE HAD PREVIOUSLY BEEN CLRED TO MCN SINCA 3 ARR TO ATLANTA. (THE ACFT IS EQUIPPED WITH OLD LITTON 51 CAROUSEL NAV UNITS.) WE SWITCHED OVER TO ATLANTA AND THEY (ATC) CLRED ME PRESENT POS DIRECT DUBLIN VOR SINCA 3 ARR. I TUNED THE DUBLIN VOR AND TOLD THE OTHER PLT TO PROCEED DIRECT DUBLIN WHILE I PROGRAMMED THE INS FOR THE NEW CLRNC. WHILE I WAS REPROGRAMMING THE INS; ATLANTA CALLED AND ASKED WHERE WE WERE GOING. I GLANCED AT THE VOR NEEDLES AND IT APPEARED WE WERE PASSING DUBLIN SO I ASKED FOR DIRECT SINCA INTXN. THE PF HAD FAILED TO SWITCH OUR NAV MODE FROM INS TO NAV; THEREFORE WE WERE STILL ON A HDG (NOT DIRECT TO DUBLIN). ATC THEN CLRED US TO SINCA INTXN; SINCA 3 ARR. SHORTLY THEREAFTER; WE WERE GIVEN 2 HDGS TO FLY AND INCREASE AIRSPD. WE COMPLIED. FURTHER FLT INTO ATL WAS UNEVENTFUL. ON THE GND; WE REVIEWED WHAT HAD HAPPENED. IT WAS MY FAILURE TO ENSURE THE PF SWITCH NAV MODES ON THE AUTOPLT; COUPLED WITH HIS LACK OF ACFT CURRENCY; NIGHT FLT; HIGH DENSITY ARPT AND MANY NAV CHANGES REQUESTED BY ATL IN SUCCESSION THAT CONTRIBUTED TO THIS EVENT. THERE WAS NO CONFLICT AND THE FLT CONTINUED FINE.