Not sure what an 'ath indicator' is, but the 737 can give an 'ILS' type display on a PRNAV approach.
Any images of what you get on this type?
Do not have a picture to hand, but on the 190/195 (I suppose the 170/175 are the same) you get a VGP indication (Virtual Glide path) indication which the AP can capture and follow.
The setup and checks are a little different but actually there is little difference in flying an ILS or an VNAV approach. You even arm the AP with the same button. The computer figures out depending on the setup (FMS/Radios etc) what type of Approach you are flying.
The most "difficult" approach you can get in an E-Jet is a loc only because you have to control the descent rate old school style
(VS or FPA)
So it is going to be interesting for us E-Jet drivers to know how and why this incident happened.
If I do find a picture I will upload it...