FWIW our EASA-land OM, paraphrased, for RNAV.../uncompensated VNAV states:
Always fly ATC assigned altitudes without corrections, unless considered unsafe.. etc etc.
If you are at or warmer than the charted minimum temperature for using VNAV then it can be used with no corrections to procedure altitudes.
If it is colder than the limiting temperature, you use the non-VNAV minima if they exist (and vertical mode to be used is V/S or FPA).
If it's any colder than ISA -25 you apply low temp corrections (using an approved table/calculator) to any platform/FAF altitude and MDA/DA. Tell ATC what your Platform/FAF crossing altitude is going to be.
Last edited by wiggy; 17th Dec 2015 at 10:29.