FATIGUED INTL CREW RETURNING FROM JAPAN PROGRAMMED FMS INCORRECTLY WHEN RECEIVING ARR CLRNC. ARTCC OBSERVED RESULTING ENCROACHMENT ON MIL AIRSPACE AND GAVE CORRECTING VECTORS.

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WAS RECLRED APPROX 1 HR OUT OF PDX BY VANCOUVER CTR AT DOLFF; BTG/312 DEGS/70 DME; THEN THE BTG/275 DEGS/25 DME; THEN BTG; PDX. WHEN THE CLRNC WAS GIVEN CAPT WAS IN THE L SEAT AND IRO IN THE R SEAT; FO WAS ON BEAK AND OUT OF THE COCKPIT. CAPT MADE THE FMS ENTRIES. WHEN ZSE NOTED THE ERROR FO WAS IN THE R SEAT AND HAND FLYING THE ACFT WHILE CAPT MADE FMS ENTRIES. PRIOR TO THE BTG/312 DEGS/70 DME WE WERE GIVEN AN IMMEDIATE TURN AWAY FROM RESTR AIRSPACE. ZSE INFORMED US THAT WE WERE NOT GOING TO THE BTG/312 DEGS/70 DME WAYPOINT. THE FMS SHOWED THE WAYPOINT W OF OUR POS. THEY SUGGESTED WE CHK OUR NAV DATA. A CHK WAS MADE FINDING 2 BTG REF POINTS IN THE DATABASE; BOTH GAVE THE SAME LATITUDE/LONGITUDE; THE SECOND ALSO HAD 116.6. WHEN I WAS GIVEN THE CLRNC; I SELECTED THE FIRST WAYPOINT AS THE LATITUDE/LONGITUDE MATCHED THE REQUIREMENT. IN MY SUBSEQUENT INVESTIGATION I FOUND THAT THE BTG I SELECTED WAS ACTUALLY THE BTG/275 DEGS/25 DME AND ALL WAYPOINTS MADE FROM BTG -- WERE OFF THIS DISPLACED WAYPOINT; IE; BTG/275 DEGS/25 DME WAS IN FACT BTG/275 DEGS/50 DME; THUS THE ERROR IN NAV. I QUESTIONED THE CREW AND NO ONE REMEMBERED MAKING A DEFINED WAYPOINT AS BTG AND THE RADIAL 275 DEGS/25 DME IN THE DEFINED WAYPOINT PAGE. THE DATABASE WAS CHANGED PRIOR TO OUR DEP AS THE LAST DATE EXPIRED AND A NEW DATABASE WAS USED FOR THIS FLT. CONCLUSION: WHEN A DEFINED WAYPOINT IS MADE IN THE FMS; I FEEL THAT IT SHOULD BE NOTED ON THE FLT PLAN IN THE EVENT THAT THE PLT IS NOT ON DUTY AT THE TIME THIS WAYPOINT WOULD BE REFERRED.