This is a good discussion point for those of you that are working towards your instrument rating, as well as those of you CFII’s that are doing the teaching.
As a CFI/CFII/MEI, I often see other instructors teaching students that the Primary for Pitch on an ILS approach (glideslope) is the VSI. These students are often getting confused when taking their oral, because in one sense they rely on the GSI (glideslope indicator) as primary for pitch when flying the approach… while in the exam room they state that the primary for pitch (as they have been taught) is the VSI. Thankfully most examiners are not failing them for this misconception, but it does eliminate confusion in the minds of our students by giving them the correct understanding along with the right information. The primary for pitch IS the glideslope indicator…the reason it is not the VSI is because the vertical speed indicator does not take groundspeed changes into account.
Just a little issue, but it may help eliminate some confusion:)