THE PLT OF A C172 FLIES INTO EXPANDED P40; A TFR AROUND CAMP DAVID. THE DEPICTION OF P40 ON HIS GPS IN NOT ACCURATE.

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FLYING FROM W99 TO 1N9. RECEIVED NOTAM INFO FOR RTE OF FLT FROM FS; INCLUDING EXPANDED P40. FILED VFR FLT PLAN. USING AN IFR GPS; VOR; HANDHELD GPS AND CURRENT SECTIONAL FOR NAV. 5 MI SW OF FREDERICK; THE HANDHELD FAILED AND THE VOR SWUNG WILDLY AS IF TO INDICATE OVER VOR. PANEL MOUNT GPS SHOWED STILL ON COURSE AND 5 MI OUT. VARIED COURSE 1 MIN OR LESS TO ASCERTAIN VOR AND GPS STATUS AND NOTED LOCATION ON SECTIONAL AS JUST PAST THE HARPER'S FERRY BRIDGES. I TURNED OFF THE FAILED HANDHELD. PANEL MOUNT GPS INCLUDES 2 CONCENTRIC CIRCLES AROUND P40; WHICH I ASSUMED WERE THE STANDARD AND EXPANDED AREAS. I WAS CLR THE OUTER RING BY SEVERAL MI ACCORDING TO THE GPS AND NO ALERT SHOWED ON THE SCREEN. CONTINUED PAST FREDERICK ON SAME HDG AND WAS INTERCEPTED BY A SECRET SVC HELI ABOUT 2-5 MI ENE OF FREDERICK. WAS INFORMED ON 121.5 THAT I WAS WITHIN THE TFR. I INFORMED THEM THAT MY MULTIPLE NAV SHOWED ME CLR AND ASKED WHAT I WAS TO DO. GOT NO RESPONSE AS TO WHAT ACTION WS TO BE TAKEN; SO CONTINUED ON COURSE. HELI FOLLOWED ME FOR 5-10 MINS AND BROKE OFF. CALLED SECRET SVC AT DEST AS REQUESTED. THEY SAID I WAS 2 MI INSIDE THE TFR ACCORDING TO ZDC. THEY ALSO NOTIFIED ME THAT THE SECTIONAL DID NOT ACTUALLY SHOW THE CORRECT BOUNDARIES OF THE TFR. I LATER WAS TOLD BY ANOTHER PLT THAT THE DATABASE IS ALSO NOT CORRECT FOR THE EXPANDED P40; EVEN THOUGH BOTH CIRCLES SHOW ON THE MAP. I WAS NOT AWARE OF EITHER OF THESE DISCREPANCIES IN MAPPING ON THAT DAY.