Some reservations however about the wiggy's quoted "no cold temp corrections required to the coded vertical profile on 2D APCH (LNAV only) if within ISA-25" (hope the paraphrase is not oversimplyfying). I am loosely aware there are some cold temp considerations in the design of 2D APCH (LNAV only) procedures,..
MIght be my poor phrasing/syntax FD. For clarity:
If there is no minimum temperature on the chart our Company backstop is no use of VNAV on approach if below -25 ISA. FWIW most if not all of our fleets have uncompensated baro VNAV, no option to enter a surface temp for corrections, and we are not allowed to alter FMC altitudes either, hence the restriction.
Yes, I agree we would need to apply corrections on a 2D LNAV (and e.g VS or FPA) approach in cold temp conditions.
Hope that makes more sense.