C172 PLT LANDS IN THE WRONG DIRECTION AT RBG; AN UNCTLED ARPT.

Narrative

APCHING ROSEBURG (RBG) I WAS FOCUSING ON A FOREST FIRE THAT WAS APPROX 5 MI FROM THE FIELD. I RPTED THE FIRE TO ZSE THEN STARTED A DSCNT TO TPA. THE FIRE WAS PRODUCING A LOT OF SMOKE AND MY ATTN WAS FOCUSED ON THAT SIT AND ON MY NEED TO RAPIDLY LOSE ALT. I WOULD SAY THAT THIS WAS POOR CRM ON MY PART; AND I WAS NOT FOCUSED ON PREPARING FOR LNDG AT RBG APPROPRIATELY. I WAS NAVING USING PILOTAGE AND ALSO AN AVIATION GPS MOVING MAP (ANYWHERE MAP ON A PDA). AS I APCHED THE FIELD THE GPS STARTED TO ACT ERRATICALLY AND STOPPED PROVIDING USEFUL NAV INFO. I WAS UNFAMILIAR WITH THE AREA AS THIS WAS MY FIRST APCH INTO ROSEBURG. THE LOSS OF GPS AND LACK OF PILOTAGE SKILLS FOR THE LCL AREA RESULTED IN PLT DISORIENTATION. I CIRCLED THE CITY OF ROSEBURG AT APPROX 1500 FT AGL LOOKING FOR THE FIELD. I THOUGHT I HAD A FIELD IN SIGHT; BUT THERE WERE NO RWY MARKINGS AND THE STRIP LOOKED TOO SMALL TO BE ROSEBURG. I CIRCLED OVER THE STRIP; AND DECIDED THAT THIS WAS; IN FACT; NOT ROSEBURG. MY PAX AND I WERE CONCERNED ABOUT OUR EXACT LOCATION AS ANOTHER ACFT WAS GIVING POS RPTS FOR THE ROSEBURG PATTERN FOR RWY 34. I WAS RADIOING MY POS -- AT FIRST INCORRECTLY DUE TO MY DISORIENTATION. I RESET THE GPS; CLBED TO GAIN MORE VISUAL CUES; AND EVENTUALLY SPOTTED ROSEBURG ABOUT 3 NM AWAY. I STARTED TO HEAD DIRECTLY TO THE FIELD; ALIGNED WITH RWY 16. THE FIELD WAS RECENTLY REPAVED; AND HAD NO MARKINGS WHATSOEVER ON THE RWY. I MISTOOK RWY 16 FOR RWY 34. WHY I DID NOT CHK MY DIRECTIONAL GYRO OR MAGNETIC COMPASS I CANNOT SAY. MY GPS DOES NOT PROVIDE RWY DETAILS; AND I WAS DISORIENTED AND HIGHLY STRESSED BECAUSE OF MY EARLIER MISTAKEN IDENT OF THE FIELD. APCHING RWY 16; I RADIOED A 'STRAIGHT-IN APCH TO RWY 34.' I SPOTTED AN ACFT AHEAD; APPROX 1000 FT HORIZ; 500 FT VERT IN THE OPPOSITE DIRECTION AND HEADING TOWARDS ME. THIS ACFT RADIOED 'ON DOWNWIND TO RWY 34.' WE BOTH SPOTTED EACH OTHER; AND I APOLOGIZED (THINKING; INCORRECTLY THAT I HAD CUT HIM OFF ON FINAL APCH). SINCE THE RWY HAD NO MARKINGS; I WAS UNABLE TO DETERMINE MY MISTAKE IN THINKING I WAS ALIGNED WITH RWY 34; WHEN I WAS IN FACT ALIGNED WITH RWY 16. I LANDED WITHOUT INCIDENT BUT REQUIRED SIGNIFICANT BREAKING PRESSURE DUE TO A 10 KT TAILWIND. AT THIS POINT I WAS STILL NOT AWARE OF MY MISTAKE. ONLY AFTER A CFI (AND ATP) RATED PLT ON THE FIELD APCHED ME AND ASKED WHY I LANDED AGAINST THE TFC FLOW DID I REALIZE WHAT I HAD DONE. I THINK MY INEXPERIENCE AS A PLT; COUPLED WITH THE STRESS OF BECOMING LOST CLOSE TO THE DEST WERE CONTRIBUTING FACTORS. I THINK THE LACK OF RWY MARKINGS ON THE FIELD WAS ALSO A CONTRIBUTING FACTOR. IN THE FUTURE; I WOULD RECOMMEND THAT A NOTAM THAT SPECIFICALLY STATED THAT 'THE FIELD HAS NO MARKINGS' SHOULD BE RELEASED TO FSS. IN MY CASE; FSS ONLY INDICATED' NON STANDARD' MARKINGS -- WHICH IS NOT A SPECIFIC ENOUGH INDICATION OF THE HAZARDS OF A TOTALLY UNMARKED FIELD.