Please have a look at the pic below....
I took this picture a while back while on a jumpseat landing into Singapore..
I noticed that the a/c was still on Autopilot with VNAV engaged. Also noticed that the Glide slope indicator was active though the 'APP' function was not engaged yet. This brings me to the question. Does an aircraft's VNAV function create a descent profile such that it would be aligned with glide slope or issit just coincidental?
PS: Looks like we were speeding a bit