SINGLE PLT OF BE55; UNAWARE OF THE PRECISE EXTENT OF THE TFR; PENETRATED DC ADIZ. OVERHEARD TRANSMISSIONS ON GUARD FREQUENCY REGARDING ROGUE ACFT WHOSE POSITION MATCHED HIS. TURNED S AND EXITED ADIZ.

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ON 05/SAT/03; I FLEW FROM W66 TO ESN. THE PLANNED RTE OF FLT WAS W66; BRV; WHINO; ESN. I ENTERED THE DC ADIZ APPROX 14 MILES S OF THE MARYLAND ARPT. I WAS MONITORING 121.5 AND HEARD TWO CALLS THAT AN ACFT HAD ENTERED THE ADIZ 14 MILES S OF MARYLAND ARPT. THE FIRST CALL RPTED THE TFC .25 MILE INTO THE ADIZ AND HDG E AT 2500 FT. I DID NOT THINK I WAS IN THE ADIZ AND THOUGHT THE CALL WAS FOR SOMEONE ELSE. THE SECOND CALL WAS FOR TFC 1 MILE INTO THE ADIZ AND HDG E AT 2300 FT. WHEN THE FIRST CALL WAS MADE I WAS AT 2500 FT MSL. WHEN THE SECOND CALL WAS MADE I WAS AT 2400 FT MSL. I WONDERED IF IT WAS ME THEY WERE CALLING AND TURNED S. NO MORE CALLS WERE MADE FOR THE TFC. AT THIS POINT I LOOKED AT THE TAC AND FOUND MARYLAND ARPT. BY MY CALCULATIONS I WAS ABOUT 14 MILES S OF THE ARPT AND PRETTY SURE I WAS THE TFC BEING CALLED OUT. I HAVE AN AUTOMATIC SUBSCRIPTION FOR MY SECTIONALS AND TACS; WHICH KEEP THEM CURRENT. THE EXTENDED AREA FOR THE ADIZ WAS NOT MARKED ON THE CHART. I KNEW ABOUT THE CLASS B BEING AN ADIZ AND TRIED TO STAY WELL CLR OF IT. HAD A SPECIAL ISSUE OF THE TAC BEEN ISSUED I WOULD HAVE HAD THE INFO IN THE COCKPIT TO AVOID THE ADIZ.