AN AS350 B3 PLT ACCIDENTALLY PENETRATES THE FLOOR OF THE CLASS C AIRSPACE WITHOUT CLRNC WHEN 9 NM NNE OF SNA; CA.

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ENRTE BTWN MHV TO RNM VIA L70; TRANSITIONING N OF SNA BELOW THE FLOOR OF CLASS C AIRSPACE AT APPROX 9 MI NNE OF SNA. POSSIBLE AIRSPACE INTRUSION INTO SNA CLASS C AIRSPACE AT BOUNDARY BTWN 2000-3500 FT FLOOR OF THE NORTH CENTRAL AND NE PORTION OF OUTER RING. WHILE IN CRUISE FLT AT 1900 FT MSL IN THE NORTH CENTRAL OUTER RING OF SNA CLASS C AIRSPACE AND IN THE PROCESS OF DETERMINING THAT I WAS CLR OF THE DISNEYLAND TFR AND TRYING TO LOCATE THE CTR OF THE TFR ON THE LOS ANGELES SECTIONAL; LOS ANGELES INSET (NEITHER OF WHICH DEPICTS DISNEYLAND); I INADVERTENTLY CLBED TO 2300 FT BY WHICH TIME I WAS WITHIN THE NE SECTION OF THE CLASS C WHICH HAS A FLOOR OF 3500 FT MSL. I MAY HAVE ENTERED THE CLASS C NEAR THE BORDER OF THE 2000-3500 FT FLOOR; BUT BY THE TIME I NOTICED; I WAS WELL WITHIN THE NE SECTION OF SNA. BECAUSE THIS TFR WAS NOT NEAR MY INTENDED RTE; I HAD NO GRAPHICAL TFR MAP; ONLY A TEXT VERSION OF FDC 3/2123; AND HAD NOT BRIEFED THIS TFR. QUICKLY IDENTIFIABLE TEXT INFO AND DEPICTION OF DISNEYLAND ON THE SECTIONAL WOULD REDUCE THE RECOGNITION TIME ESPECIALLY DURING SINGLE PLT OPS.