XING RESTR NOT MET DUE TO IMPROPER COCKPIT INST NAV INFO. INTERMIX OF INS ON ONE PLT'S DISPLAY AND VOR ON THE OTHER PLUS THE AUTOPLTS TIED TO EACH CAUSED CONFUSION AND COMPLACENCY.

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WE WERE CLRED PLT'S DISCRETION FROM FL350 TO FL230; I BELIEVE. I STARTED A 2500 FPM DSCNT RATE ABOUT 36 MI FROM THE XING RESTR OF GIBER AT FL230. ONCE WE WERE IN THE DSCNT; I PLANNED TO INCREASE TO 3000 FPM TO 3500 FPM. WE HAD BEEN USING THE AUTOPLT #1 THE ENTIRE FLT DUE TO THE #2 NOT TRACKING INS POS. WE JUST SWITCHED TO #2 AUTOPLT AND WAS TRACKING VOR. THE HSI IN THIS ACFT SHOWS INS MI ON THE TOP CORNERS. ALTHOUGH I WAS TRACKING VOR I WAS USING THE DME FROM THE INS ON THE TOP L WHICH IS THE CAPT'S #1 INS MILEAGE. THAT WAS A HABIT FROM USING IT THE ENTIRE FLT. WHAT I DIDN'T REALIZE WAS THE CAPT HAD A DIFFERENT POS THAN GIBER PROGRAMMED IN. I SHOULD HAVE NOTICED THE DIFFERENCE IN DME FROM VOR AND INS BUT DID NOT; ASSUMING WE HAD THE CORRECT INS POS ACQUIRED. THAT HAD BEEN A CHANGE IN OUR CLRNC SOME TIME EARLIER FROM THE S ARR INTO DTW TO THE N ARR. GIBER WAS NOT PROGRAMMED IN UNTIL THE XING RESTR WAS GIVEN. EVIDENTLY IT WAS PROGRAMMED ONLY ON THE FO SIDE. THE INS POS STILL SHOWED 11 MI TO GIBER WHEN CHICAGO ANNOUNCED WE PASSED GIBER AT ABOUT 2500 FT ABOVE THE XING ALT. WE TOLD HIM OUR INS SHOWED 11 MI TO GO AND CHKED VOR/DME WHICH SHOWED WE HAD PASSED GIBER. WE WERE CONFUSED; THINKING THE INS WERE MALFUNCTIONING WE USED VOR/DME THE REMAINDER OF THE FLT. WHEN WE LANDED AND PARKED AND WENT BACK OVER EVERYTHING WE REALIZED OUR MISTAKE OF USING AN INS/DME THAT WAS NOT THE POINT IN THE CLRNC. SOME CONTRIBUTING FACTORS: I HAD JUST FLOWN A CAPT TRIP 2 OR 3 DAYS PRIOR; SO I HAD BEEN USING THE L-HAND DME. WE HAD BEEN USING AUTOPLT #1 WHICH IS TIED TO INS #1 FOR THE ENTIRE FLT UP TO THAT POINT BUT CHANGED SINCE I WAS NOW HAND FLYING THE ACFT. WE RELAXED AND DID NOT INSURE BOTH #1 AND #2 INS'S WERE LOADED THE SAME WHICH LED ME NOT TO CHK THE VOR/DME AS A BACKUP. TO CORRECT THIS INCREASED DILIGENCE TO BACKUP POS BY ANY MEANS AND FIGHT COMPLACENCY. IT WOULD ALSO HELP IF ALL OUR DC10'S HAD THE SAME PANEL CONFIGN; ALTHOUGH THAT IS A VERY SMALL ITEM IN THIS INSTANCE.