[Rocketman99]

OK, many times flying into IAD on the JASEN4 arrival I've been given some clearance like "fly heading 195 out of GILBY" or "after GILBY fly heading 195." GILBY is the last waypoint on the arrival, 6 DME off the AML VOR. My question is, am I expected to lead the turn to 195 and start it around 7.5 DME or so or am I expected to wait until 6 DME, THEN turn to a 195 heading? We are expected to use normal lead points for turns on airways and the like, so is the same thing true here? In case it helps someone answering, it's not a GPS flyover or flyby point. Thanks, this has been an ongoing debate...