CONFUSED BY HIS IFR CLRNC; SINGLE PLT OF C182 VIOLATES DC ADIZ WITH A MALFUNCTIONING; IMPROPERLY OPERATED XPONDER.

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I FILED A FLT PLAN WITH ALTOONA FSS AND GOT A STANDARD WX BRIEF ALONG WITH THE PERTINENT NOTAMS. I THEN DEPARTED BVI. WHEN I HAD JYO IN SIGHT; I CANCELED IFR AND SWITCHED TO 122.975 PER POTOMAC'S INSTRUCTIONS. LATER THAT DAY I FILED A FLT PLAN BACK TO BFI AND DID IT IN THE LEESBURG FSS. I WAS GIVEN THE FOLLOWING CLRNC: CLRED BVI VIA STILL INTXN THEN AS FILED. CLB TO 3000 FT. DEP FREQ 125.05; SQUAWK XXXX. AS I WAS LOOKING FOR STILL INTXN ON MY LOW ENRTE CHART; I DIALED IN THE SQUAWK CODE AND TURNED ON MY XPONDER. I COULD NOT FIND STILL INTXN ON MY LOW ENRTE CHART AND CALLED CLRNC DELIVERY FOR CLARIFICATION. THEY TOLD ME IT WAS STRAIGHT OUT RWY 35. I FOUND STILL INTXN ON MY APCH PLATE; DIALED IN THE PROPER RADIAL FROM MARTINSBURG AND FREDERICK; GOT A RELEASE AND DEPARTED JYO. I WAS ON EDGE BECAUSE I COULD NOT FIND STILL INTXN ON THE LOW ENRTE. AFTER ABOUT 10 MINS I CALLED 118.55 FOR VERIFICATION THAT I HAD REACHED STILL INTXN AND WANTED TO PROCEED ON COURSE TO HAGERSTOWN VOR. I WAS TOLD TO CALL 125.05 WHEN ABLE AND THEY WERE 'LOOKING FOR ME.' DURING THE EARLY PART OF MY FLT; THE SQUAWK CODE WAS READ TO ME AND I BELIEVE I VERIFIED THAT I WAS SQUAWKING THE CORRECT NUMBER. THEY DID NOT TELL ME THAT THEY COULD NOT SEE ME. I CALLED 125.05 AND WAS TOLD TO CALL THEM 'WHEN ABLE.' WITHIN A FEW MINS; I CALLED THEM BACK AND THEY GAVE ME A PHONE NUMBER TO CALL WHEN ON THE GND. I BELIEVE THEY TOLD ME THAT THEY COULD NOT SEE ME. I THEN TURNED THE XPONDER OFF AND BACK ON IMMEDIATELY AND I DON'T REMEMBER WHETHER THEY CONFIRMED THEY COULD SEE ME. WHEN I GOT ON THE GND AND CALLED; I WAS TOLD THAT I WAS 'A PRIMARY TARGET' AND THAT I WOULD BE SENT A PACKAGE IN 2-3 WKS. I'M NOT SURE WHAT THE PROB IS; BUT I CAN TELL YOU THAT I WAS SOMEWHAT ON EDGE WHEN NOT BEING ABLE TO LOCATE STILL INTXN ON MY GOV CHART. AFTER RESEARCH; I DID DETERMINE THAT STILL IS CALLED LUCKE ON THE CHART AND IS THE SAME LOCATION AS THE APCH PLATE INDICATES IS STILL INTXN.