SMA PLT INTERPRETS CLRNC ISSUED BY SBA DEP CTL AND TURNS ON COURSE AS FILED. AFTER COMS XFER TO ZLA; ZLA CTLR QUESTIONS HEADING CLRNC AND CORRECTS PLT'S ROUTING.

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ATC CLRNC WAS TKOF RWY 15L AT SBA; FLY RWY HEADING; VECTORS FILLMORE; V386; PALMDALE TO 67L (MESQUITE; NV); CLB TO 3000 FT EXPECT 13000 FT 5 MIN DEP; 120.55 SQUAWK XX. AFTER TKOF CTLR HAD ME MAKE L TURN TO ABOUT 140 DEGS AND THEN ANOTHER L TO 010 DEGS WHICH WAS ALMOST 90 DEGS TO DIRECTION OF FILLMORE; I HAD HIM REPEAT HEADING AND I THOUGHT HE SAID FILLMORE 'WHEN ABLE.' BUT HE SAYS 'VECTORS' FILLMORE. AT 10000 FT; I RPTED THAT I WAS RECEIVING FILLMORE AND HENCE TURNED R TO 060 DEGS DIRECT FILLMORE. 2 OR 3 MINS LATER; SBA DEP HANDED OFF TO ZLA. AFTER 2-3 MINS ZLA ASKED MY HEADING AND I SAID '060 DEGS' DIRECT FILLMORE. HE WANTED TO KNOW WHERE I GOT SUCH A CLRNC. I SAID SBA DEP. HE CAME BACK AFTER A LAND LINE CALL TO SBA DEP AND SAID THEY DID NOT CLR TO FILLMORE BUT GAVE ME THE 010 DEG HDG FOR TFC. ZLA THEN GAVE HDG OF 040 DEGS AND SAID I COULD EXPECT A DIRECT PALMDALE. TFC WAS NEVER MENTIONED BY SBA DEP. CONCLUSION AND RECOMMENDATIONS: WHEN A CTLING FACILITY GIVES A HEADING SO CONTRARY TO THE PROPOSED DIRECTION OF FLT THAT A REASON BE GIVEN; IE; TFC TERRAIN; OR THE PHRASE MAINTAIN SUCH AND SUCH HEADING THROUGH AN ALT. SINCE MY ORIGINAL CLRNC SAID I WAS TO GO FROM FILLMORE TO PALMDALE ON V386; I WAS SET TO GO TO FILLMORE; BUT THAT'S NOT ATC'S PLAN -- THEY PLAN TO VECTOR YOU N AND DIRECT PALMDALE. WHY NOT LEAVE OUT THE FILLMORE AND V386 PART OF THE CLRNC?