B747 CREW HAD TRACK DEV ON THE KENNEDY 7 SID FROM JFK.

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CLRED FOR KENNEDY 7 DEP; BRIDGE CLB. LEGS PAGE OF FMC SHOWED WAYPOINTS CRI - GAYEL WITH A DISCONTINUITY BTWN THEM; AS IT SHOULD BE. I LATER CLOSED UP THE DISCONTINUITY; OUT OF HABIT; I SUPPOSE. THUS; THE FO AND AUTOPLT WERE PROGRAMMED TO GO TO GAYEL IMMEDIATELY AFTER CRI; AND NOT MAINTAIN THE 220 DEG HDG. THE CTLR NOTICED OUR PREMATURE R TURN AND TOLD US TO LEVEL AT 3000 FT; WHICH WE DID; THEN ASSIGNED A L TURN TO 210 DEGS (OR 220 DEGS). WE COULD HAVE AVOIDED THIS ERROR BY DOING A DEP BRIEFING; DURING WHICH I AM SURE WE WOULD HAVE NOTICED THE LACK OF A 'VECTORS' SEGMENT. THIS BRIEFING IS ACR SOP; BUT I DON'T BELIEVE IT WAS DONE ON THIS OCCASION. SUPPLEMENTAL INFO FROM ACN 457410: AFTER EVALUATION; WE NOTICED THE KENNEDY 7 IS A VECTOR DEP AND LNAV SHOULD NOT HAVE BEEN ENGAGED. THIS IS INCONSISTENT WITH OTHER VECTOR DEPS SUCH AS THE PALACE DEP AT DTW. IT CANNOT BE SELECTED IN THE FMC THUS FORCING THE PLTS TO USE HDG SELECT. SUPPLEMENTAL INFO FROM ACN 457292: ON DEC/WED/99; I WAS PART OF A B747-400 AUGMENTED CREW ON ACR FLT ABC FROM JFK TO ZZZ. I WAS RIDING IN THE JUMP SEAT WHILE THE WORKING CREW MADE THE DEP. DUE TO A PROGRAMMING ERROR; THEY MADE A WRONG TURN WHILE EXECUTING THE 'BRIDGE CLB' OUT OF JFK. THEY HAD SELECTED THE JFK 7 DEP FROM THE FMC DEP PAGE. THAT DEP DEPICTS ONLY THE INITIAL L TURN THEN A RTE DISCONTINUITY. THE CAPT CLOSED THE DISCONTINUITY; WHICH PRESENTED THEM WITH A L TURN FOLLOWED BY AN IMMEDIATE R TURN TO GAYEL INTXN. THE CREW MADE AN AUTOPLT DEP AND IT FLEW THE DEP AS PROGRAMMED. ONE HALF WAY THROUGH THE R TURN; KENNEDY DEP ASKED FOR AND RECEIVED AN IMMEDIATE L TURN BACK TO THE PROPER DEP VECTOR HDG. ALTHOUGH THE CREW BRIEFED THE DEP; THEY MISSED THE 'BRIDGE CLB' PORTION OF THE DEP AND RELIED ON THE FMC TO FLY THE DEP. ON THIS DEP THAT IS PROBABLY NOT A GOOD IDEA. THE AUTOPLT WAS SLOW TO REACT AND ALMOST OVERSHOT THE CANARSIE RADIAL. NOT ONLY THAT; AS PLTS; I THINK WE TEND TO LOSE SOME OF OUR EDGE WHEN THE AUTOPLT IS DOING THE WORK. IT IS OBVIOUS THAT A MORE THOROUGH BRIEFING OF THE DEP WOULD HAVE PREVENTED THE EXCURSION. MORE ALERT BACKUP FROM THOSE OF US IN THE JUMP SEATS MAY HAVE ALSO PREVENTED THE R TURN. HOWEVER; THERE IS ONE BUILT-IN TRAP THAT COULD BE ELIMINATED. THE KENNEDY 7 DEP IS A 'VECTORED' DEP; AND AS SUCH SHOULD PROBABLY NOT BE LISTED ON THE DEP/ARR PAGE OF THE FMC. BECAUSE OF THE EXISTENCE OF THE DEP IN THE FMC; THE CREW FAILED TO NOTICE THE SECOND SECTION OF THE CLB. DTW DEPS ARE 'VECTORED' AND THEY ARE NOT LISTED ON THE DEP/ARR PAGE FOR DTW.