FIRST 2 CREWMEN ON A 4 MAN LONG RANGE CREW LOADED A FLT PLAN IMPROPERLY. THE SECOND 2 CREWMEN DID NOT FIND THE ERROR. WHEN THE ACFT CAME INTO RADAR COVERAGE; ARTCC FOUND THE ACFT COURSE.

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OUR FLT PLAN CLRNC WAS FROM OVER POINT A VIA AIRWAY 1 TO POINT B. THE ANV COMPUTER WOULD NOT TAKE AIRWAY 1 OR POINT B. POINT C WAS IMPROPERLY ENTERED AT PREFLT WHICH CAUSED US TO GO DIRECT FROM POINT A TO POINT C INSTEAD OF ROUTING VIA AIRWAY 1. PRIOR TO REACHING POINT C WE WERE NOTIFIED BY CTR WE WERE APPROX 120-130 MI OFF COURSE. THIS WAS A WDB FROM ABC TO DEF I WAS PART OF THE SECOND CREW. CORRECTIVE ACTION -- WE WERE JUST CLRED DIRECT TO POINT D. HUMAN PERFORMANCE FACTORS -- 2 PLT CREW; LONG INTL FLT; WE WERE THE SECOND CREW. COMPANY FLT PLAN; LOADING PROCS (IRS) COULD USE IMPROVEMENT. SUPPLEMENTAL INFO FROM ACN 209129. 2 FLT CREWS -- FIRST CREW LOADED THE FLT PLAN IN COMPUTER AND THEY COULD NOT GET THE COMPUTER TO ACCEPT THE FLT PLAN; SO THEY HAD TO DO WHAT WE CALL A MANUAL LOAD. THEY (FIRST CREW ON DUTY) STATED THEY LOADED THE WRONG WAYPOINTS. SECOND CREW FLEW THE ACFT WHEN ARTCC STATED THAT THE ACFT WAS OFF COURSE. ACFT WAS ASSIGNED A HDG TO POINT D. ATC SUPVR STATED NO OTHER ACFT WERE CLOSE TO THIS ACFT.