A FOREIGN PLT IN AN SMA ASKED FOR ATC HELP IN AVOIDING THE SAN TCA AND WAS LITERALLY LEFT OUT TO SEA.

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I FLEW AN SMA ON 8/SAT/92 FROM RAL TO SDM VFR. DEPARTED RAL AROUND PM30 CRUISING ALT 7500 FT; TRIED TO GO E OF SAN DIEGO TCA. APCH INSTRUCTED ME TO GO W SIDE OF TCA AND DSND TO 5500 FT AS PASSING W OF CRQ; OFF THE SHORE. BELOW 125/88 SECTOR APCH TOLD ME TO DSND TO 3500 FT TO FLY BTWN 125/48 AND 125/68 SECTORS. APCH ALSO TOLD ME THAT RADAR SVC IS TERMINATED AND CONTACT APCH 119.6 IF NECESSARY. AS I FLEW BELOW 125/48; I NOTICED I HAD TO DSND BELOW 1800 FT IN ORDER TO CLR 125/18 SECTOR. MY HDG SHOULD ALSO SUPPOSE TO KEEP ME OUT OF 125/SFC SECTOR; W OF SAN DIEGO. HOWEVER; I FOUND OUT THAT MY HDG INDICATOR WAS OFF BY 20 DEG AND I REALIZED I WAS IN 125/SFC SECTOR SO; I IMMEDIATELY TURNED W TO CLR OUT OF THAT SECTOR AND I TRIED TO CONTACT APCH ON 119.6 AGAIN. THE APCH TOLD ME TO CALL BACK IN 1 MIN. I CIRCLED FOR 1 MIN IN 125/18 SECTOR; RECONTACTED AND THEN THEY GAVE ME THE CLRNC AND VECTOR TO BROWNS FIELD. I TRIED MY BEST TO AVOID TCA AFTER THE RADAR SVC WAS TERMINATED. I DIDN'T EXPECT SAN DIEGO APCH WOULD CANCEL THE RADAR SVC.