PLT OF SMA ENTERS DC ADIZ WITHOUT CLRNC. IS INTERCEPTED BY CUSTOMS POLICE HELI.

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PROB: MY ACFT UNKNOWINGLY PENETRATED THE WASHINGTON DC ADIZ. CAUSE OF PROB: LACK OF CLR INFO/CONFLICTING INFO. CONTRIBUTING FACTORS: VFR SECTIONAL CHART (APPROVED BY FAA AND DEPT OF DEFENSE); THAT WAS THEN CURRENT; SHOWS THAT THE WASHINGTON DC 'PROHIBITED AREA' DOES NOT EXTEND TO GAI. THE CHART CLRLY SHOWS THAT VFR FLT TO GAI BELOW 3500 FT AVOIDS CLASS B AND PROHIBITED AREA AIRSPACE. THE FSS CTLR (BANGOR; ME) WHO WAS GIVEN THE DEST ARPT (GAI) DID NOT INFORM ME THAT GAI WAS NOW INSIDE THE ADIZ (AND WOULD; THEREFORE; REQUIRE A FILED FLT PLAN WITH FREQ AND DISCRETE CODE). MY FAILURE TO DIFFERENTIATE THE DC ADIZ FROM THE PREEXISTING OFFSHORE ADIZ THAT MIGHT HAVE BEEN PENETRATED IF MY VFR RTE WAS E OF THE NY CLASS B AIRSPACE. FAILURE ON MY PART (AFTER STUDYING THE WASHINGTON SECTIONAL CHART AND QUESTIONING FSS ABOUT CURRENT TFR'S) TO FOCUS ON APPROPRIATE NOTAM. HOW DISCOVERED: BY MIL INTERCEPT (CUSTOMS POLICE HELI). CORRECTIVE ACTIONS: CONTINUED DILIGENCE BY FAA/DEPT OF DEFENSE/FSS ETC; TO DISSEMINATE CLR; NON CONFLICTING INFO. CONTINUED DILIGENCE BY PLTS TO INFORM THEMSELVES OF CURRENT INFO.