AN ACR MLG CREW DID NOT NOTICE THE REVISED DEP ROUTING ON ITS PREDEP CLRNC.

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THE CREW DEPARTED BWI RWY 28; AND FOLLOWED A PUBLISHED SID WHICH DEPICTED A TURN TO 150 DEGS AT THE BAL 3 DME. THE INITIAL ALT ASSIGNMENT WAS 4000 FT. AFTER ACCOMPLISHING THE TURN AT 3 DME TO 150 DEGS; A FURTHER CLB CLRNC TO 8000 FT WAS ISSUED AND ACKNOWLEDGED. APCHING 5000 FT; BWI DEP CTLR ISSUED A 'MAINTAIN 5000 FT CLRNC' WHICH WAS ACCOMPLISHED WITHOUT DIFFICULTY. THE CTLR THEN QUERIED THE DEP CLRNC; AND INDICATED IT SHOULD HAVE BEEN 'RWY HDG FOR VECTORS.' THE CREW THEN INQUIRED IF THERE HAD BEEN A CONFLICT. THE CTLR SAID 'NO PROB.' THE CREW INDICATED THAT THEY HAD SEEN NO CONFLICT ON TCASII SYS NOR VISUALLY (CLR NIGHT VFR). THERE WAS NO TFC WITHIN 5 MI; NOR 1000 FT. UPON REVIEW OF THE ACARS PDC MESSAGE; THE CREW RECALLED THAT THEY HAD A DISCUSSION REGARDING THE USE OF 'HASH MARKS' AND HOW THAT WAS SOMETIMES CONFUSING; BUT IN THIS CASE SHOWED NO CONFLICT WITH THE FLT PLAN RELEASE; SO NO FURTHER INQUIRY WAS MADE. HOWEVER; THE CREW DID MISS THE ADDENDUM ON PAGE 2 'FLY RWY HDG VECTOR ASSIGNED RTE/FIX.' I BELIEVE THE FOLLOWING FACTORS RELEVANT TO THIS OCCURRENCE: RESCHEDULING CREW INTO DAYS OFF. DELAYS DUE TO WX AND ARPT CONDITIONS. USE OF 'HASH MARKS' ON THE PDC CLRNC. DEP CLRNC ON PAGE 2 INSTEAD OF WITH RTE CLRNC. TWR TKOF CLRNC INCLUDED NO 'FLY RWY HDG' COMMENT WHICH IS STANDARD AT SOME ARPTS (LACK OF STANDARD PROCS). CREW EXPECTED A SID (SIDS ARE THE NORM IN THE PART OF THE AIRLINE SYS THIS CREW NORMALLY FLIES); AND IN THIS INSTANCE HAD PLACED A SID ON THE CTL COLUMN CLIP. TO PREVENT A RECURRENCE POSSIBLY THE FOLLOWING WOULD HELP: STANDARDIZE THE 'TKOF CLRNC' TO ALWAYS INCLUDE INITIAL HDG. STANDARDIZE THE PLACEMENT OF THE INITIAL DEP INSTRUCTIONS ON ALL PDC/ACARS ISSUED CLRNCS. USE COMMENT 'REVISED ROUTING' VICE HASH MARKS ON PDC ISSUED CLRNCS.