One thing I’ve noticed recently is that there are a lot of airports (mostly places I would describe as “tier-2”, but that’s purely my own description of them) are using the wrong frequency for the tower, which is always (that I’ve noticed) the same as ground. At my “home” field of KPIE, for example, the proper tower frequency is 118.3, but they’re using 121.9 (the proper and actual ground freq) instead.
Is this somehow related to the overall topic of AIRAC data and updates? (FWIW, I’m also using Navigraph).