MULTIPLE NAV EQUIP FAILURES CAUSE PLT TO GIVE AN ERRONEOUS POS RPT WHEN REQUESTED BY ARTCC BECAUSE OF RADAR CONTACT LOSS.

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DURING THE FLT EARLY THIS MORNING TO DTS; FL; #1 XPONDER STOP WORKING; HOWEVER #2 XPONDER WAS STILL WORKING. WHEN LEAVING DESTIN FOR COLUMBIA; MS (0R0); ZJX CLRED US TO FL200 AND DIRECT 0R0. JUST PRIOR TO REACHING GCV VOR; WE WERE HANDED OFF TO ZHU. SHORTLY THEREAFTER; BOTH DME FAILED AND THE SECOND XPONDER FAILED. ZHU SAID 'RADAR CONTACT LOST' WHAT IS YOUR POS IN RELATION TO GCV? I CTRED THE #2 NAV CDI NEEDLE AND GAVE A QUICK POS RPT. WHEN I LOOKED BACK AT THE #2 VOR; IT HAD FLAGGED; THUS MAKING THE POS RPT WRONG. THE ACFT WAS WITHIN 7 MI OF THE GCV VOR AT THIS TIME. CTR QUESTIONED THIS POS RPT AND ISSUED A CLRNC DIRECT TO GCV VOR; VICTOR 11 TO PICAN INTXN V222 EATON VOR (LBY) THEN DIRECT 0R0. AFTER REACHING THE GCV VOR; I SIMPLY FLEW THE CLRNC AS ISSUED AND THE REST OF THE FLT WAS NORMAL. THE THING I LEARNED FROM THIS EXPERIENCE IS THAT ANY TIME A PARTICULAR PIECE OF EQUIP FAILS ON AN AIRPLANE; FIX IT NOW. ONE XPONDER NOT WORKING IS NOT PROB UNTIL #2 QUITS AND THEN ADD DUAL DME FAILURES AND A FLAGGED VOR AND THINGS CAN TURN INTO A REAL MESS.