AN A320 CREW DEPARTING FROM ONT RWY 26R ON POM6 DEP AT ONT MAINTAINED 255 DEG HDG AS DISPLAYED IN THE DEP PROC; INSTEAD OF INTERCEPTING THE POM 114 RADIAL AS DIRECTED BY ONT ATCT.

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POM6 DEP FROM ONT SPECIFIES A HDG OF 255 DEGS IN THE 'INITIAL CLB' BOX THEN A ROUTING IN THE 'ROUTING' BOX BELOW. ON TKOF; WE WERE GIVEN THE CLRNC 'FLY HDG 255 DEGS; CLRED FOR TKOF.' AFTER DEP; WE CONTACTED SOCAL AND CONTINUED THE CLB. AS IT BECAME CLR THAT WE WERE PASSING THE SID TURN; WE ATTEMPTED TO CONTACT SOCAL FOR INSTRUCTIONS; BUT THE CTLR WAS VERY BUSY COORDINATING SEVERAL SMALL ACFT IN THE AREA; AND WE WERE UNABLE TO GET A WORD IN. FINALLY; SHE CALLED US ASKING OUR HDG; WHICH WE GAVE AS 255 DEGS; AND SHE ISSUES AN IMMEDIATE TURN TO 360 DEGS AND ASKED IF THE TWR HAD GIVEN US A 255 DEG HDG; TO WHICH WE SAID YES. CLEARLY; IF WE WERE MISTAKEN; AND THE TWR DID NOT ISSUE 255 DEGS HDG; THE FAULT WAS OURS. IN REVIEWING THIS LATER; WE DID NOTICE THAT THE POM6 WAS A BIT UNUSUAL IN ITS GUIDANCE TO THE PLTS AND COULD BE IMPROVED TO ALLEVIATE CONFUSION. FIRST; MOST OF THE INITIAL CLB BOXES THAT WE LOOKED AT FOR OTHER MAJOR ARPTS WE USE STATE SOMETHING LIKE; 'FLT HDG XXX; EXPECT RADAR VECTORS ON COURSE;' OR OTHER WISE DIRECT THE PLT TO A FIX ON THE SID IN THE CLB BOX. A GOOD EXAMPLE IS THE BORDER5 FROM SAN FOR RWY 9; WHICH STATES IN THE 'INITIAL CLB' BOX; 'CLB VIA A 90 DEG HDG TO INTERCEPT AND PROCEED VIA MZB R-096 TO BROWS. THEN VIA TRANSITION OR ASSIGNED RTE.' VERBAGE LIKE THIS LEAVES NO DOUBT AS TO WHAT THE PLT SHOULD TAKE. NEXT; WE STILL HAVE A MIX OF OLD-STYLE SIDS AND NEW; SOME WITH BOTH AT ONE ARPT. SFO HAS BOTH; THE QUITE2 IS OLD; WITH CLB AND ROUTING ALL IN ONE PARAGRAPH; AND THE OFFSHORE5 IS NEW; WITH SEPARATE INITIAL CLB AND ROUTING BOXES.