A CPR C560 FLC FAILS TO AVOID A RESTR AREA WHEN NAVING ON FMS ONLY; DID NOT HAVE THE DQO VOR TUNED FOR BACK-UP DISPLAY WHEN ON FREQ WITH ZDC; DC.

Narrative

AFTER DEPARTING XXX WE WERE CLRED DIRECT XYZ VOR; WHICH WAS ENTERED INTO THE GNS-X'S FMS. EVERYTHING APPEARED NORMAL UNTIL ATC DIRECTED US TO TURN R 90 DEGS TO AVOID A RESTR AREA WHERE LIVE FIRE WAS TAKING PLACE. WE EXECUTED THE TURN AS DIRECTED AND A SHORT WHILE LATER WE WERE RECLRED DIRECT TO XYZ. THE FMS DEPICTED THE VOR AHEAD AND TO THE L; SO WE TURNED L TO PROCEED TO THE VOR. ATC THEN TOLD US TO CHK OUR FMS SINCE WE WERE HDG BACK INTO THE RESTR AREA. BY THIS TIME I HAD TUNED THE VOR FREQ ON MY NAV WHICH SHOWED THE VOR AHEAD AND TO OUR R. I FOLLOWED ITS COMMANDS AND NOTIFIED ATC THAT WE WOULD BE USING VOR/DME FOR THE REMAINDER OF THE FLT; NOT THE FMS. WE WERE UNABLE TO RESOLVE THE DISCREPANCY WITH THE FMS; BUT OUR CONCLUSION IS THAT SOMEWHERE WE MUST HAVE ENTERED THE DATA INCORRECTLY; EVEN THOUGH BOTH CREW ARE EXPERIENCED WITH THIS TYPE FMS AND THE REQUIRED STEPS TO ENTER THE DATA ARE SIMPLE. OUR COMPANY'S SOP DICTATES THAT 1 CREW MEMBER HAS REGULAR VOR/DME TUNED IN AT ALL TIMES TO BACK UP THE FMS; BUT THIS MORNING WE WERE COMPLACENT AND DISTR BY OTHER DUTIES DURING THE CLBOUT AND HADN'T YET SETTLED INTO THE ROUTINE. IN SUMMARY; I RECOGNIZE THE IMPORTANCE OF BACKING UP THE FMS WITH NORMAL VOR/DME NAV; EVEN UNDER ROUTINE CIRCUMSTANCES; A LITTLE DOUBLECHKING WOULD HAVE PREVENTED TOSSING THE PAX INTO A STEEP; UNPLANNED TURN.