OUT OF DATE DATABASE IN NEWLY INSTALLED GPS DIRECTS BE58 FLT CREW TO WAYPOINT LOCATION THAT IS NO LONGER ACCURATE.

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FOLLOWING REPLACEMENT OF ACFT AVIONICS; ACFT RETURNING TO HOME BASE ZZZ. FILED IFR AS /G; AND GIVEN 'DIRECT ABC.' AS ACFT WAS COMING FROM THE N; THIS DIRECTED US TOWARD P-XX WHICH IS WELL KNOWN TO THE CREW. ALSO; AT NO TIME WAS THE ACFT S OF THE ZZZ RWY XX EXTENDED CTRLINE OR ILS XX INBOUND COURSE. NEW GPS HAD ABC IN THE DATABASE; AND 'DIRECT TO' WAS COMMANDED. CTR EVENTUALLY QUESTIONED HDG/FIX. ABC IS ON THE ILS XX ZZZ (WHICH WAS DELETED WHILE RWY IMPROVEMENTS WERE MADE AT ZZZ). CREW ASSUMED THAT SINCE ABC WAS IN THE DATABASE; THAT ITS LOCATION WAS ACCURATE AND CURRENT. IN FACT; CREW KNEW FROM BRIEFING THE CURRENT PAPER CHARTS IN THE ACFT THAT 'OLD' ABC WAS ABOUT 4 MI W OF 'NEW' ABC ON NEW ILS XX. CREW ALSO ASSUMED THAT THE DATABASE WOULD HAVE DELETED ABC ONCE THE OLD ILS WAS SUSPENDED; SO THAT WITH ABC IN THE DATABASE; THAT ITS LOCATION WOULD BE ACCURATE. IN FACT; THE NEW DATABASE IN THE NEW GPS WAS NOT CURRENT BUT DID INCLUDE THE OLD LOCATION OF ABC. DATABASE WAS ONE CYCLE OUT OF DATE. INFLT; THERE WAS NO WAY TO KNOW THAT THE LOCATION OF ABC WAS IN ERROR; UNTIL POINTED OUT BY CTR. USING DME; IT WOULD HAVE BECOME OBVIOUS WHEN GETTING CLOSER (EVENTUALLY). CTR ASKED IF CURRENT PLATE WAS IN USE BY ASKING THE DME AT ABC; WHICH WAS CONFIRMED TO THEM OFF THE CURRENT PLATE. THERE WERE NO FURTHER ISSUES AND THE ILS WAS COMPLETED WITHOUT INCIDENT FOLLOWING RADAR VECTORS BACK TO A POINT OUTSIDE ABC. CERTAINLY; A CURRENT DATABASE WOULD HAVE AVOIDED THIS; BUT COULD NOT BE OBTAINED (WE DID REQUEST IT PRIOR TO DEP). SINCE UPDATE ACCOUNT HADN'T BEEN SET UP; IT WAS NOT AVAILABLE. VERY IMPORTANTLY THOUGH; I BELIEVE THAT THE DATABASE SHOULD NOT HAVE INCLUDED AN 'EXPIRED' WAYPOINT WHICH WAS NOT IN USE AFTER THE 'OLD' ILS XX INTO ZZZ WAS DELETED. IF IT WASN'T AVAILABLE; THE CREW COULD HAVE DECLINED THE CLRNC AND REQUESTED RADAR VECTORS FROM THE BEGINNING. MOST IMPORTANTLY; IF A WAYPOINT IS MOVED OR OTHERWISE CHANGED; THE NAME SHOULD BE CHANGED. THERE ARE ANY NUMBER OF 'HONEST MISTAKES' THAT COULD LEAD A PLT TO THE OLD LOCATION OF A MOVED WAYPOINT. ALL THESE ISSUES WOULD VANISH IF THE WAYPOINT NAME WAS SIMPLY CHANGED.