FLC IS DISTRACTED WHICH RESULTS IN THEIR FLYING BY A VOR THAT MARKS THEIR TURNING POINT TO BE ON COURSE.

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AFTER TKOF PHL DEP HANDED US OFF TO ZNY. WE WERE ENRTE FROM TTN TO MSP. WE WERE CLRED DIRECT TO PTW VOR AT 10000 FT. OUR RTE WAS THEN TO BE PTW 320 DEG RADIAL; J64 RAJ. THE AFTER TKOF AND 10000 FT CHKLIST WAS COMPLETED; AND WE WERE COMMENTING ON HOW GOOD THE VISIBILITY WAS AFTER LEAVING THE FOG IN TTN. WE WERE BOTH SCANNING FOR TFC WHEN I POINTED OUT A 747 AT ABOUT 10 O'CLOCK LOW; A FEW MI AWAY. I SAID TO THE CAPT THAT I WAS SURPRISED NO ONE CALLED OUT THE TFC TO US; WHICH WAS DIRECTLY FOLLOWED BY A CALL FROM CTR FOR US TO TURN R HARD TO 360 DEGS. IT SEEMS WE WENT RIGHT PAST PTW AND MISSED OUR TURN TO THE 320 DEG RADIAL. THE CAPT WAS NAVING WITH THE VLF; I HAD RAJ VOR TUNED FOR THE NEXT LEG. THE FLT DIRECTOR WAS IN HDG MODE; SO THE CAPT HSI STAYED CTRED. THAT; AND THE GREAT VISIBILITY WHICH KEPT US LOOKING OUTSIDE; CONSPIRED TO CAUSE THE INCIDENT. INSTEAD OF BOTH PLTS LOOKING AROUND OUTSIDE; WE SHOULD HAVE BEEN PAYING ATTN TO NAVING AS WELL. SUPPLEMENTAL INFO FROM ACN 299388: CO-CAPT SELECTED VLF ON MY SIDE WITHOUT MY NOTICING. I WAS NAVING OFF FLT DIRECTOR THINKING WE WERE RECEIVING VOR INFO; WHILE IN REALITY IT WAS IN VLF MODE. ONE PLT SHOULDN'T MAKE SELECTION WITHOUT OTHER PLT'S KNOWLEDGE. CAPT SHOULD KEEP MORE ALERT.