MD11 DEADHEADING PLT HELPED THE FO FROM GOING TO THE WRONG WAYPOINT; AS LISTED IN THE FMC; IN PACIFIC OCEANIC AIRSPACE.

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I WAS A DEADHEADING CREW MEMBER RIDING IN THE COCKPIT FROM PGUM TO HNL. THE CAPT HAD LEFT THE COCKPIT AND THE FO IN THE R SEAT WAS NEW WITH OUR COMPANY. THE IRO WAS IN THE COCKPIT; BEHIND THE NEW FO. THE NEW FO WAS HAVING TROUBLE WITH HIS POS RPTS; SO I WAS HELPING HIM OUT. WHILE HELPING HIM MAKE THE RPT OVER POS 24N; 170W; I NOTICED HIS AIREP FORM WAS FILLED OUT CORRECTLY; BUT HE HAD PROGRAMMED THE NEXT POS IN THE FMS AS N24; 175W. HOWEVER; THE FLT PLAN PAPERWORK SAID THE NEXT POS SHOULD BE N2500; W17500. I QUICKLY QUESTIONED BOTH WORKING FO'S AND THEY BOTH AGREED THE NEXT POS IN THE FMS WAS WRONG. WHILE OVER N24; 170W (SINCE I WAS THE SENIOR PERSON IN THE COCKPIT AT 7 YRS ON THE MD11); I QUICKLY REPROGRAMMED THE FMS FOR N25; 175W. WE THEN GOT THE CAPT AND INFORMED HIM WHAT WAS GOING ON AND ALSO GOT HIS AGREEMENT OF THE CORRECT POS IN THE FMS. IN MY OPINION; THE SENIOR CREW MEMBERS ON THAT FLT SHOULD HAVE KEPT A CLOSER EYE ON THE NEW CREW MEMBER. THE FMS LOAD PLAN PROBABLY WAS NOT DOUBLE-CHKED AFTER IT WAS LOADED EITHER. A GROSS NAVIGATIONAL ERROR NEVER OCCURRED SINCE THE FMS WAS EDITED BEFORE THE PLANE PROCEEDED TO THE WRONG POS. DOUBLE-CHKING AND VIGILANCE CANNOT BE STRESSED ENOUGH. I FEEL MOST INTL PLTS DO NOT GET ENOUGH TRAINING FROM THEIR COMPANIES. IT WAS LATE AT NIGHT AND EVERYONE WAS EXTREMELY TIRED.