UNAUTH LNDG. WRONG RWY APCH LNDG.

Narrative

THE INCIDENT OCCURRED WHEN I APCHED PBI (WEST PALM BEACH INTL ARPT). AS I WAS APCHING NEAR THE ARPT; THEY HAD FIRST GIVEN ME A HDG VECTOR OF 180 DEGS AND SAID 'SBOUND CLR FOR L BASE RWY 13.' I FOLLOWED THE ASSIGNED HDG OF 180 DEGS BUT WAS CONFUSED WITH THE DIRECTION OF LNDG WHEN I FOUND THE ARPT; I INITIATED A DSCNT. DURING THE DSCNT; I TRIED TO DECIDE WHICH RWY WAS THE ASSIGNED RWY. I WAS APCHING WHAT I THOUGHT WAS RWY 13; BUT I WAS TOLD BY ATC TO REJOIN FINAL FOR RWY 13. THIS THEN CONFUSED ME AND I WASN'T SURE IF THE RWY I WAS LINED UP WITH WAS THE CORRECT ONE. I THEN DECIDED TO JOIN THE DOWNWIND FOR THE OPPOSITE DIRECTION WHICH WAS ACTUALLY RWY 31. DURING THE PATTERN; THE TWR DIDN'T SAY ANYTHING; SO I ASSUMED THAT I WAS RIGHT IN MY DECISION. THIS OBVIOUSLY THEN RESULTED ME IN LNDG ON THE WRONG RWY. I BELIEVE WHAT CONFUSED ME THE MOST AT THE END WAS THE DIAGRAM I HAD ON MY LAP WHICH WAS AN OUTLAY OF THE RWY. YOU SEE; I REALIZED THAT I HAD THE DIAGRAM UPSIDE DOWN; WHICH MADE RWY 31 AT THE BOTTOM OF THE DIAGRAM. BECAUSE I WAS COMING FROM THE N; I HAD PICTURED THE BOTTOM OF THE DIAGRAMS AS N AND THE TOP S. WHEN I CROSSED REF MY POS WITH THAT OF THE DIAGRAM; IT SHOWED ME THAT I WAS ENTERING A 45 DEG L BASE FOR RWY 31. WHEN ATC SAID TO REJOIN FINAL FOR RWY 13; I KNEW ACCORDING TO THE DIAGRAM I WAS ENTERING FROM THE WRONG SIDE. THAT IS WHY I DECIDED TO ENTER A L DOWNWIND FOR RWY 13. BUT IN ACTUALITY I WAS ENTERING A L DOWNWIND FOR RWY 31. WHILE FLYING ON THE L DOWNWIND FOR RWY 31; I COULD NOT SEE THE NUMBER BECAUSE I WAS TOO FAR OUT. WHAT I SHOULD HAVE DONE WAS CROSS REF THE DIAGRAM WITH MY HDG INDICATOR. I SHOULD HAVE ALSO ROTATED MY DIAGRAM OF THE RWY AS HOW I WOULD REALLY SEE IT AS I APCH THE FIELD. I COULD HAVE ALSO ASKED TWR IF THEY HAVE VISUAL CONTACT SO THEY MAY REALIZE I WAS ENTERING THE WRONG RWY.