HDG TRACK DEV IN A NON ADHERENCE TO ATC PROC INSTRUCTION CLRNC.

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CLRNC DELIVERY ISSUED CLRNC WITH SID -- FLY RWY HDG. BEFORE TKOF WE; PF AND I; REVIEWED THE INST DEP PROC (ATTACHED). SINCE IT WAS A REDUCED VISIBILITY TKOF AT GROSS WT; WE DISCUSSED FOLLOWING THE IFR DEP PROC THAT SAYS 'ALL ACFT CLB DIRECT SEA VOR.' WE DEPARTED NORMALLY; BEGAN A R TURN TOWARD SEA VOR (DEP WAS FROM RWY 13R). WHEN WE SWITCHED OVER TO DEP CTL; 119.2; CTLR ASKED 'WHERE ARE YOU GOING' I REPLIED 'SEA VOR;' HE ASKED IF I WAS GIVEN SID FOR DEP; I REPLIED YES; THEN HE TOLD US TO RETURN TO RWY HDG. CTLR SOUNDED UPSET. I WAS COMPLYING WITH THE IFR DEP PROC. I'M STILL CONFUSED ABOUT THIS SITUATION. FAR 91.175 IS NOT SPECIFIC ABOUT THIS; NOR IS AIM 325 B (C)(A)(B)(C). I CALLED THE CTR SUPVR UPON RETURN AND POINTED OUT THE DISAGREEMENT BTWN THE SID AND THIS SITUATION BEFORE AND WAS AT FIRST DEFENSIVE OF HIS CTLRS ACTIONS; THEN WHEN I EXPLAINED WHY I DID WHAT I DID; HE UNDERSTOOD THE CONFLICT BTWN THE SID AND IFR DEP PROC. HE WAS GOING TO TRY AND GET A RESOLUTION FOR ME FROM SOMEONE HE KNEW IN FLT STANDARDS AND PROMISED TO CALL ME BACK.