A PA28 CFI WANDERS INTO THE CLASS B AIRSPACE OF CVG WHEN DEPENDING SOLELY UPON THE NAV INFO FROM HIS GPS WHICH WAS UNKNOWINGLY MISPROGRAMMED TO A POINT 25 MI S OF RID; IN.

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INADVERTENT FLT INTO CINCINNATI CLASS B AIRSPACE. FLT PROCEEDED AS PLANNED AND FILED TO SHB. I USED THE GPS AS A XCHK TYPICALLY USING THE GPS AS A VOR IN THE TO/FROM METHOD. I WAS XCHKING IN BTWN NAVAIDS WITH THE VOR AND ADF. ON THE LAST LEG OF THE FLT I WAS USING THE GPS AS THE PRIMARY NAV AS THERE IS NO AIRWAY DEFINED BTWN SHB AND MGY. THE RTE OF THE LAST LEG OF THE TRIP (SHB TO MGY) MAKES A COURSE JUST N THE CINCINNATI CLASS B AIRSPACE. I ELECTED NOT TO USE INDIANAPOLIS APCH FOR FLT FOLLOWING AS MY COURSE WAS N OF THAT LOCATION. I WAS INTENDING TO USE DAYTON APCH AS I GOT CLOSER TO MGY AND PLANNED TO RPT TO DAYTON APCH WHEN I WAS DIRECTLY S OF RID. AS I WAS ABOUT TO CONTACT DAYTON APCH; I DIALED IN RID ON THE DME. UPON CONTACT WITH DAYTON APCH; I ADVISED THAT I WAS ON THE 180 DEG RADIAL OF RID AND 25 MI S. AT THAT TIME DAYTON ADVISED ME THAT I WAS OUT OF THEIR AIRSPACE AND IN CVG CLASS B AIRSPACE AT WHICH TIME THEY ADVISED ME TO CALL CVG APCH. I WAS ADVISED BY CVG APCH THAT I WAS IN CLASS B AIRSPACE. THE CVG APCH CTLR DIRECTED ME FOR HDGS TO MGY AND GAVE ME A NUMBER TO CALL UPON LNDG. THE 10-20 MINS THAT THIS ISSUED PLAYED OUT WENT QUICKLY WITH LITTLE TIME TO DIAGNOSE WHAT WENT WRONG WITH A PLAN THAT SHOULD HAVE BEEN EASY TO FOLLOW. THE REASON THAT I WAS CONFUSED IS THAT I WAS TRACKING TO WHAT I HAD DIALED IN WHICH IS NOT WHERE I INTENDED TO FLY. I HAD FORGOTTEN TO ENTER THE 'K' BUT WAS NOT AWARE OF THE MISTAKE AS THE GPS GAVE ME A LOCATION THAT APPEARED TO BE WHAT I WANTED. I HAVE REVIEWED THE CINCINNATI CHARTS AND FOUND NO MGY NAVAIDS WITH THAT IDENT. I HAVE ASKED GPS COMPANY TO CHK THEIR DATABASE AND CONFIRM THAT MGY DOES NOT EXIST. I CONCLUDE THAT THIS LOCATION (MGY) HAS BEEN CREATED AND STORED AS A USER IDENTED LOCATION. FAILURE TO TRACK THE SHB 'FROM' RADIAL LONG ENOUGH TO ESTABLISH A GOOD COURSE DIRECTION TO XCHK AGAINST THE GPS. FAILURE TO VERIFY VFR POS BY GND REF TO ESTABLISH GOOD COURSE DIRECTION. FAILURE TO OPERATE WITH ALL AVAILABLE CTL CTRS. UTILIZING THE IFR SYS WITH VFR WX WOULD HAVE BEEN A GOOD OPTION. BELIEVING THAT THE GPS WAS BETTER THAN ALL OTHER FORMS OF NAV AVAILABLE AT THE TIME WAS A POOR DECISION; WHICH WAS AGAINST THE BASIC PREMISE OF VFR FLT.