PLT OF SMA HAS PROB WITH SID INTERP RESULTING IN A HEADING DEV. DEP CTLR GIVES HIM A VECTOR TO RE-ESTABLISH ON RTE.

Narrative

I DEPARTED LIVERMORE MUNICIPAL IFR ON RWY 7; BYRON ONE DEP; MANTECA TRANSITION; PROCEEDING DIRECTLY TO THE LV LOM. THE TWR HANDED ME OFF TO STOCKTON APCH; WITH WHOM I MADE CONTACT. AT THE LOM; RECEIVING THE MARKER BEACON; I TURNED TO A 030 DEG MAGNETIC HEADING; AS DEPICTED IN THE SID; THEREAFTER CLBING THROUGH 3000 FT TO 5000 FT; MY CLRNC ALT. STOCKTON APCH CONTACTED ME; STATING I WAS 4 DEGS OFF COURSE. I RESPONDED THAT I WAS FLYING THE PUBLISHED SID; DESCRIBING MY PROCS. WE DISCUSSED THE SID FOR A MIN OR SO. APCH THEN STATED I WAS AT 3200 FT AND HAD 'BLOWN THE ALT RESTR.' I COUNTERED THAT I FOLLOWED THE ALT RESTR TO THE LOM; THEN BEGAN A CLB TO MY CLRNC ALT. STOCKTON APCH GAVE ME A 050 DEG HDG TO INTERCEPT V244 AND A STOCKTON APCH TELEPHONE NUMBER TO CALL UPON LNDG. WHEN I LATER DISCUSSED THE INCIDENT BY TELEPHONE WITH THE STOCKTON FACILITIES ANALYST; HE TOO THEN OBSERVED THAT I SHOULD HAVE TURNED TO A 030 DEG HDG AT THE LOM. SINCE I HAD REVIEWED THE SID NARRATIVE AFTER LNDG; I NOTED THE NARRATIVE CALLS FOR A L TURN VIA A 30 DEG BEARING FROM THE LV LOM. THAT WOULD EQUATE TO A 040 DEG MAGNETIC HEADING. WE BOTH AGREED THE SID IS AMBIGUOUS AND SHOULD BE CORRECTED; WHICH SHOULD PREVENT RECURRENCE IN THE FUTURE. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATES THAT HE BELIEVES THE WORDING SHOULD BE CHANGED TO REFLECT THE DIFFERENCE BTWN THE RELATIVE BEARING AND THE MAGNETIC HEADING. HE FEELS THE HEADINGS SHOULD ALL BE MAGNETIC. WHEN HE CALLED ATC LATER IN THE DAY THERE WAS NO MENTION OF AN ALTDEV. THERE HAS BEEN NO FURTHER FOLLOW UP. THE RADAR AT APCH CTL DOES NOT TRACK IN THIS AREA BELOW 2800 FT SO RPTR WAS NEAR THE 3000 FT LEVEL WHEN PICKED UP ON RADAR.