SMA PVT PLT PERFORMS AN UNAUTH PENETRATION OF CLASS C AIRSPACE.

Narrative

I WAS FLYING SEBOUND TO NEWPORT BEACH; PARALLEL TO THE SHORELINE AT APPROX 2500 FT MSL. THE ORIGINAL PLAN WAS TO PROCEED NEBOUND; PARALLEL TO THE MOST NW BOUNDARY LINE; JUST OUTSIDE THE CLASS C AIRSPACE; (HDG 010 DEGS MAGNETIC) OF THE SNA CLASS C AIRSPACE AT AN ALT OF 2600 FT MSL THEN AT DISNEYLAND THERE WOULD BE A SLIGHT CHANGE IN COURSE TO A HDG OF 007 DEGS MAGNETIC OR VICTOR 394 TOWARDS BRACKET ARPT (POC). BECAUSE I WAS FLYING VERY CLOSE TO THE CLASS C ALTS; I HAD GREAT CONCERNS; ONE IS FOR EXAMPLE; THAT MY READING OF 1950 FT ON MY DIAL MAY BE READING GREATER THAN 2000 ON YOUR RADAR SCREEN. WHEN I HAD HUNTINGTON PIER IN SIGHT; I TURNED TO A HDG OF 010 DEGS. AT THIS TIME I RECHKED THE POMONA VOR FREQ AND TO A HDG OF 010 DEGS. I PROCEEDED TO FOLLOW MY VOR RADIAL; UNFORTUNATELY; I DRIFTED MORE EASTWARD; MOST LIKELY ATTRIBUTED TO THE XWINDS; AND FLEW OVER MILE SQUARE WITH A HDG OF 010 DEGS; REALIZING THAT I WAS FLYING WITHIN A CLASS C AIRSPACE; I TUNED IN THE ATIS FOR LONG BEACH AND RE-SET MY ALTIMETER. NOTE THAT THE ALTIMETER WAS PREVIOUSLY SET WHILE FLYING CLOSE TO LONG BEACH. IMMEDIATELY I PROCEEDED TO FLY JUST BELOW THE 2500 FT MSL AND HEADED 010 DEGS AND GRADUALLY DSNDED TO AN ALT JUST BELOW 2000 FT MSL FT (CONSTANTLY LOOKING AT THE CHART AND LOOKING FOR TFC). WHEN I REACHED A SAFE UNCTLED AIRSPACE; I PROCEEDED TO CALL BRACKETT TWR; AND RPTED FOR LNDG. ROOT CAUSE(S): XWIND. SETTING OF ALTIMETER TO AN ARPT LOCATED 15 MI AWAY. WHEN PRESENT LOCATION WAS CHKED AGAINST THE VFR TERMINAL CHART AND REALIZED THAT MI SQUARE WAS DOWN BELOW. 32ND EDITION (NOTE: THIS CHART WAS CURRENT AT THE TIME OF FLYING).