I am flying X-Plane 11 and before that P3D V4. A friend has MSFS2020. On some airports I cannot use the ATIS frequencies, that are in the AIRAC cycle data. I wonder, why that is so.
For example EGLL has 113.75 as ATIS in the AIRAC cycle, while X-Plane, P3D and MSFS use 128.08. And only 128.08 MHz do work in the sims (at least in X-Plane 11 and P3D, MSFS has a second frequency 121.935). I think in real life all frequencies are correct, only it does not help here because when flying in the sim, only one works for all, which is 128.08.
Another example: Navigraph data have for RAF airbase EGWU ATIS 299.8 kHz. X-Plane , P3D and MSFS use 113.75 MHz. I think in reality both frequencies are correct. Again, only 113.75 can be set in the sim.
My question is, whether it is possible/planned to list the sim relevant ATIS in the Navigraph cycle data. Littlenavmap, that many people use, comes with its own database for communication frequencies and uses AIRAC data for everything else (VOR and so on). I realize now, why LNM needs that.
But why not have the sim relevant ATIS frequencies directly in the AIRAC cycle?