DISPLACED LOC AND GS COURSE CREATES A HDG TRACK DEV BY THE FLT CREW OF AN MD80 ON APCH TO RWY 2 VISUAL WITH ILS BACK UP DURING A NIGHT OP AT BNA; TN.

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ON DOWNWIND TO BNA; FLT WAS VECTORED TO R BASE FOR VISUAL RWY 2R; BNA. CREW VISUALLY IDENTED BNA RWY 31 ON DOWNWIND. FLT WAS CLRED VISUAL RWY 2R UTILIZING INTERNALLY ILS RWY 2R AS A BACKUP WHILE ON A VECTORED R BASE TO RWY 2R. THE FLT GUIDANCE SYS (MD80; GFMS EQUIPPED; NON-EFIS) CAPTURED AND TUNED AND IDENTED LOC AND GS FOR RWY 2R BNA. PNF IDENTED PROPER ILS MORSE CODE FOR ILS RWY 2R BNA. PF CALLED RWY NOT IN SIGHT TO PNF WHILE DSNDING ON ILS LOC AND GS. DSNDING TO 1800 FT AFL; PF CALLS RWY STILL NOT IN SIGHT WHILE BNA TWR CALLS FLT; INQUIRING OUR FLT PATH. ACFT GUIDANCE SYS INTERCEPTED A COURSE AND GS PARALLELING; ILS RWY 2R LOC AND GS. PF EXECUTED A GAR WITH VECTORS TO THE ILS RWY 2R FOR AN UNEVENTFUL APCH AND LNDG. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THIS MODEL OF THE MD80; AN OLDER MODEL; DOES NOT HAVE THE MAP DISPLAY THAT THE LATER MODELS HAVE IN ASSOCIATION WITH A MODERN FMC INSTALLATION. THE FMS DOES NOT ALLOW ANY INPUT TO THE CDI FROM THIS NON EFIS TYPE APCH DISPLAY. THE APCH WAS PROPERLY CONDUCTED WITH THE CREW USING COORD AS REQUIRED FOR IDENT OF THE ILS. ALL 3 PARTICIPANTS REALIZED THAT A PROB EXISTED WITH THE TWR ISSUING HEADINGS FOR AN INTERCEPT OF THE RWY AFTER THE MISSED APCH PROC WAS STARTED. FO RPTR SAID THAT THE PIC AND FLT ATTENDANT DID NOT FOLLOW UP ON THE SUPPOSITION THAT A CELL PHONE WAS TO BLAME. FEEDBACK FROM COMPANY AND UNION REPRESENTATIVES INDICATED THAT BNA TWR HAD NO PREVIOUS EVENTS OF THIS NATURE.