A C170 PLT WAS ACCUSED BY PCT APCH OF VIOLATING THE DC ADIZ.

Narrative

FLYING NE FROM LDN VOR TO FDK VOR WITH A 5 NM L OFFSET TO AVOID IAD CLASS B AIRSPACE. CONTACTED LEESBURG RADIO FOR LATEST TFR SIT ALONG MY RTE TO PNE. ON THE E SIDE OF THE BLUE RIDGE; THE STRONG WESTERLY WINDS CREATED MODERATE TURB. MY 3 YR OLD DAUGHTER BECAME AIRSICK AND MY ATTN WAS DIVERTED FROM NAV DUTIES TO CARE FOR MY DAUGHTER. I REALIZED AFTER A SHORT TIME THAT I HAD DRIFTED E OF MY INTENDED TRACK DUE TO STRONG W WINDS AND ATTN BEING DIVERTED FROM NAV. I CORRECTED MY COURSE BACK TO THE W AWAY FROM IAD CLASS B AND CONTINUED FLT TO PNE. AFTER LNDG AT PNE; I WAS ADVISED TO CALL POTOMAC TRACON. POTOMAC ADVISED ME THAT I HAD ENTERED THE WASHINGTON ADIZ AT THE DCA 305 DEG RADIAL 40 DME FIX. A PLOT OF THIS FIX SHOWS IT TO BE 2 MI OUTSIDE OF THE ADIZ. I SHOULD HAVE CONTACTED POTOMAC TRACON INSTEAD OF JUST MONITORING; AS THIS WOULD HAVE PREVENTED THE SIT. ANOTHER FACTOR IS THE FAILURE OF THE WASHINGTON BALTIMORE TAC (VFR) CHART WHICH DOES NOT DEPICT THE ADIZ -- ONLY THE DCA EXCLUSION ZONE. HAD I KNOWN THE FULL EXTENT OF THE ADIZ; I WOULD HAVE OFFSET MY RTE FURTHER NW TO ENSURE A SAFE BUFFER FROM THE ADIZ.