Interestingly, in the following (Australian) Radar SID, the PIC is required to TRACK the runway direction until 600FT, at which time revert to the assigned HEADING. Theoretically, an assigned heading of, for example 016 off of RWY 01 in a howling Noreaster (admittedly rare) would se the aircraft drift quite few degrees at the magical 600FT mark:
http://www.airservicesaustralia.com/...BNDP01-104.pdf