AN ACR LGT FLEW THE WRONG HDG AFTER TKOF.

Narrative

I WAS PIC ON FLT AND THE FO; WHILE EXPERIENCED; WAS NEW TO THE 757. I WAS NOT IN THE COCKPIT WHEN HE GOT THE ATC CLRNC. DURING THE PREFLT PREPARATIONS; WE REVIEWED THE SID; RTE TO BE FLOWN; NOISE ABATEMENT PROCS AND SPECIAL ENG OUT PROFILE. THE SID MENTIONED A HDG OF 250 DEGS FOR THE INTERCEPT OF A RADIAL OFF THE SJU VOR OR A HDG ASSIGNED BY ATC. I ASKED THE FO ABOUT THE INITIAL HDG AND HE REPLIED 120 DEGS WHICH WAS THE SAME AS THE NOISE ABATEMENT HDG. I DID NOT QUESTION THE HDG BECAUSE OF THE WAY THE SID WAS WORDED AND THE FACT THAT THE HDG WAS THE NOISE ABATEMENT HDG. AFTER TKOF; WE WERE SWITCHED TO DEP CTL AND; DURING THE CLB (ABOUT 5000 FT MSL); WERE ASKED BY DEP CTL WHAT OUR HDG WAS. WHEN I RESPONDED; SJU DEP CLRED US DIRECT SJU. I GOT THE FEELING FROM THE MANNER IN WHICH THE HDG QUESTION WAS PHRASED THAT PERHAPS WE WERE ON DIFFERENT PAGES. I ASKED IF THERE WAS A CONFLICT OR PROB AND WAS ADVISED THAT THERE WAS NONE. WHILE I AM NOT SURE THAT A PROB EXISTED; I FELT I WOULD COMPLETE THIS FORM BECAUSE: 1) THE WORDING ON THE STT SID OPENS UP THE POSSIBILITY OF A MISUNDERSTANDING. 2) CONFLICTING NOISE ABATEMENT INFO ON COMPANY TAILORED DEP PAGE. I KNOW THAT IN THE FUTURE ALL ATC CLRNCS UNLESS RECEIVED VIA ACARS WILL REQUIRE MY PRESENCE IN THE COCKPIT.