ACR LGT TRACK DEVIATION FOLLOWED BY FAILURE TO FOLLOW CTLR INSTRUCTION ON HEADING CAUSING LOSS OF DESIRED SEPARATION WITH FOLLOWING TRAFFIC.

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CAPT FLYING ACFT. I ADVISED OUTBND HDG FOR OUR ROUTE OF FLT TO BE 036 DEGS FROM HPW AT BTWN 10-15 MI BEFORE HPW. I WAS SUBSEQUENTLY DISTRACTED (CREW MEALS BROUGHT INTO FLT STATION). NEXT NOTICED CAPT ON SAME (PREVIOUS) HDG OF 060 DEGS (INBND ON 240 DEG R TO HPW); BUT WE WERE NOW 12 DME PAST HPW. REMINDED CAPT OF 036 DEG R AND HE RESPONDED BY BEGINNING A LEFT TURN. CENTER THEN CALLED AND SAID TO FLY HDG 010 DEGS TO REINTERCEPT. CAPT CONTINUED TURN TO APPROX 340 DEGS. ON MY REMINDER THAT 010 DEGS WAS ASSIGNED HDG; CAPT STATED THAT HE WANTED TO 'HURRY BACK TO THE RADIAL' (TO PARAPHRASE). RIGHT TURN WAS BEGUN BACK TOWARD OUR NEXT FIX; PXT; THE 041 DEG R INBND. CTLR CALLED BACK AND ASKED HDG. I RESPONDED THAT WE WERE IN A RIGHT TURN PASSING 360 DEGS. CTLR RESTATED OUR ASSIGNED TO BE 010 DEGS. I REPLIED THAT THERE HAD BEEN A 'SLIGHT OVERSHOOT.' CTLR SAID THAT HE HAD HAD 20 MI SEP WITH OUR FOLLOWING TFC; BUT WAS NOW DOWN TO 10 MI; AND CLRED US DIRECTLY TO PXT. ON COMPARING CDI'S I FOUND A 4-5 DEG DIFFERENCE IN THE CAPT'S INDICATIONS AND MINE (WITH THE ACFT CENTERED ON HIS CDI; MINE INDICATED 4-5 DEG LEFT OF COURSE). AT ABOUT 10-12 DME FROM PXT; CENTER GAVE US ANOTHER ASSIGNED HDG OF 010 DEGS 'TO AVOID RESTR AIRSPACE (PXT).' CAPT COMPLIED AND NO FURTHER INCIDENTS OCCURRED. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING: HAS BEEN NO FEEDBACK FROM ATC OR FAA; BUT RPTR DID GO TO CHIEF PLT AND WAS TOLD THEY HAD OTHER RPTS OF THIS TYPE ON THIS CAPT AND THE CAPT WAS CALLED INTO THE CHIEF PLT'S OFFICE FOR COUNSELING. CAPT'S ATTITUDE TOWARD ROUTES VERY COMPLACENT AND MORE OR LESS IGNORES REST OF CREW'S INPUTS. RPTR CONCERNED BECAUSE THIS ACR HAD A PREVIOUS CASE OF PLT ACTING THIS WAY AND TURNED OUT PLT WAS SUFFERING MINOR STROKE.