CARGO FLT HAS POOR NAV INDICATIONS ON FINAL APCH.

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RECEIVING RADAR VECTORS TO AN ILS 14R APCH AT KIMPO ARPT; SEOUL; SOUTH KOREA. MULTIPLE SCATTERED LAYERS; OVCST AT 10000 FT WITH LIGHT RAIN. VISIBILITY 2 1/2 MI. LCL TIME XA45. UNABLE TO IDENT EITHER THE OUTER OR INNER LOCATOR. WHILE ON A MODIFIED R BASE (APPROX THE 19 DME ARC); THE OUTER LOCATOR WAS RECEIVED WITH CONSIDERABLE INTENSITY. THE IDENTIFIER WAS CORRECT; HOWEVER; THE NEEDLE INDICATED THAT THE STATION WAS LOCATED N OF THE BASE-TO-FINAL TURN. THE RADIO WAS TWICE RETUNED AND REIDENTED; WITH THE SAME RESULT. THE CREW DISCUSSED THE POSSIBILITY OF A FALSE SIGNAL; AND WE CONTINUED TO MONITOR THE BEACON THROUGH THE BASE AND FINAL LEGS. IT NEVER FALTERED; CONSISTENTLY POINTING TO THE WRONG LOCATION; AS THE ACFT HDG CHANGED. AT THE PASSAGE OF THE OM; ALL OTHER APCH COMPONENTS WERE OPERATING NORMALLY; WITH THE EXCEPTION OF THE 2 BEACONS (THE INNER WAS NEVER RECEIVED). AFTER LNDG; WE PARKED AT OUR GATE; ON A NE HDG; AND OBSERVED THAT WHILE THE NEEDLE SHOULD HAVE BEEN INDICATING DIRECTLY OFF THE L WING; IT WAS NOW 10-15 DEGS AHEAD OF WHERE IT SHOULD BE. WE NOTIFIED KIMPO GND CTL OF THE INCIDENT; BUT DUE TO A SEVERE LANGUAGE PROB; IT WAS UNCLEAR IF THE POTENTIAL SEVERITY OF THE PROB WAS UNDERSTOOD. UPON ARR AT OUR HOTEL; WE CONTACTED OUR COMPANY FLT CTL IN LOUISVILLE; KY; AND MADE THE FLEET SUPVR ON DUTY AWARE OF THE FACT THAT WE HAD REASON TO BELIEVE THAT POSSIBLY A FALSE BEACON MIGHT BE EMANATING FROM NORTH KOREA. THE SUPVR AGREED TO CONTACT THE NEXT CREW INBOUND TO SEOUL AND ALERT THEM TO THE POSSIBILITY. HE FURTHER INDICATED THAT HE WOULD NOTIFY ALL COMPANY FLTS THAT WOULD BE AFFECTED; AND THAT HE WOULD ALSO ALERT THE FAA. THE FOLLOWING DAY; STILL IN SEOUL; THE FLC CONTACTED OUR LCL GATEWAY MGR; AND HE PUT US IN TOUCH WITH THE SHIFT MGR AT KIMPO TWR. WE BRIEFED HIM OF THE INCIDENT; AND HE INDICATED THAT IT WAS THE FIRST OCCURRENCE OF WHICH HE HAD HEARD. THE FOLLOWING DAY; IT WAS BROUGHT TO THE FLC'S ATTN THAT ON THE SUBSEQUENT FLT; THE #1 ADF HAD BEEN 'WRITTEN UP' FOR POINTING 180 DEGS OUT OF PHASE. OBVIOUSLY; WE FELT THE CREDIBILITY OF OUR STORY SOMEWHAT COMPROMISED; HOWEVER; WE KNOW WHAT WE SAW; AND PRESSED THE COMPANY TO CONTINUE NOTIFYING FLTS THAT MIGHT BE AFFECTED. TO THE BEST OF MY KNOWLEDGE; THEY MADE THE DECISION TO WAIT FOR ANOTHER RPT BEFORE ESCALATING THE ALERT. ALTHOUGH I COMPLETELY UNDERSTAND MY COMPANY'S HESITANCY IN SOUNDING WHAT MIGHT VERY WELL BE A FALSE ALARM; I TEND TO DISAGREE WITH THEIR DECISION; AS MY TENDENCY WOULD BE TO NOTIFY AS MANY FLC'S AS POSSIBLE. I CAN'T IMAGINE HOW I WOULD FEEL IF I WERE TO LEARN OF AN ACFT THAT INADVERTENTLY STRAYED INTO NORTH KOREAN AIRSPACE; ONLY TO BE SHOT DOWN. I WOULD IMAGINE THAT IT'S BEEN A LONG DAY FOR MANY OF THE FLC'S THAT FIND THEMSELVES BEING VECTORED FOR THE APCH TO SEOUL. IN ADDITION TO CONTENDING WITH FATIGUE AND LANGUAGE DIFFICULTIES; PERHAPS BEING POLITICALLY AWARE; WITH A SMALL DOSE OF SKEPTICISM WILL KEEP US ALL ALERT AND A LITTLE SAFER.