A PA39 PLT IS QUESTIONED ABOUT HIS BRUSH WITH THE PA40 AREA AFTER ARR AND AN APPARENT INTERCEPT WHILE ENRTE TO FDK.

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ON A FLT FROM LBE TO FDK; ABOUT 15 MI OUT OF FREDRICK; I NOTICED A JET XING IN FRONT OF ME 500-700 FT ABOVE AND 1-1 1/2 MI OUT. AT THE TIME; I THOUGHT THE JET WAS LNDG AT MRB AT MY 5 O'CLOCK POS. AS I STARTED MY DSCNT; I NOTICED A JET OFF MY L SIDE ROCKING HIS WINGS. I ASSUMED IT WAS THE SAME JET. I IMMEDIATELY SWITCHED 121.5 FROM MY #2 RADIO TO MY #1 RADIO; BUT I HEARD NOTHING. THE JET BROKE OFF TO HIS L IN A CLB. AFTER CONTACTING FREDERICK UNICOM; I WAS ADVISED TO CHK IN AT THE FRONT DESK AT THE FBO AFTER LNDG. I WAS GIVEN A PHONE NUMBER TO CONTACT ATC. ATC ASKED IF I WAS AWARE OF P-40; AND I ADVISED HIM I WAS INDEED AWARE OF IT. I ASKED IS THIS WHAT THIS PHONE CALL WAS ABOUT. HE SAID YES; THAT I HAD TOUCHED THE S BORDER OF P-40. I ASKED HIM IF HE HAD THE CORRECT ACFT FOR I HAD DOWNLOADED MY FLT ONTO MY HANDHELD GPS AND IT HAD SHOWN ME NOT BEING IN P-40. I TOLD HIM I WAS DEEPLY SORRY AND APPARENTLY MY GPS MAP WAS WRONG. I RELIED TOO MUCH ON MY GPS AND NOW REALIZE I SHOULD HAVE TAKEN A WIDER RTE AROUND P-40 USING MY VOR AND LAND MARKINGS.