You can do this too. Enter into the scratch pad "<IAF><RunwayHDG>/15" then put that into the "Legs" portion on top of the IAF.

before the approach fixes?

no, it should be your last waypoint. and I could be wrong, but the heading for the waypoint has to be the RW HDG +/- 180 (the opposite direction)

before the approach fixes?

Ok, yeah if you have waypoints already there that are part of the approach, you can just create a PBD (place/bearing/distance) waypoint in the FMC. What you're defining is the fix itself, and then the magnet course and distance FROM it as if you were standing right on top of it.So, taking an example here in Phoenix (KPHX), the final approach fix for the Runway 26 ILS is called PRUNN. If I wanted to make a custom waypoint that's 10 miles out before it, I'd type PRUNN078/10 into the FMC, and line select it on top of PRUNN on the LEGS page, which places it prior to it in the flightplan. The reason the course is 078 is because the runway heading and ILS approach course is 258, so it needs to be the reciprocal course. Just imagine yourself standing at that waypoint and then pointing in the direction you want the custom waypoint created in.

Oops, sorry. You do have to add 180 degrees.And Ryan, wouldn't you put it on the F/IAF to up-select it because you want your waypoint to be before you cross the FAF fix.

Oops, sorry. You do have to add 180 degrees.And Ryan, wouldn't you put it on the F/IAF to up-select it because you want your waypoint to be before you cross the FAF fix.

Yeah you're right, oops. Edited the post.

Eric - using LNAV mode to approach the localizer actually is a perfectly valid technique. In fact I've heard from several real pilots (including my dad) that this method results in a smoother capture a lot of times than the actual LOC mode itself. You use LNAV and watch the raw data from the LOC on the F/O's screen, then just press LOC once it's lined up and it'll capture. Then arm the full approach mode for GS capture.

Ryan,With all respect, hold off a little on this one. Parallel tracking has to be excluded by selecting TRK or HDG mode to intercept the LOC if you want to fly an ILS approach.Quite common when flying into busy airports by redar vectors however.Regards,Harry

I'm not talking about actually flying the ILS in LNAV, I'm just talking about the intercept portion of it. You still press LOC, you're still monitoring the raw data as the intercept happens etc.

I'm not talking about actually flying the ILS in LNAV.

Ryan,Neither do I. Just the way it should be done in real life, based on SOP's.However, feel free to do it differently in the virtual world.Regards,Harry