Some tiem ago i recall using an app which cold set up a GPS or ILS approach with glide slope presentation. I though that it was a great way to do the display, a series of yellow rectangles centered on the glide slope and diminishing in size closer to the MAP. So this gave both lateral and vertical guidance.This would make a great addition to iFly, and perhaps for airports without a charted GPS approach gidance could be given using the stanard approach angle, or one that woud avoid any obstacles on the approach, with due warnings of course.