I've noticed that some of the TMA frequencies in Switzerland does not match with the correct ATC-unit. For example, around Zurich, SD mentions "Zurich Information", but this is only the FIS-frequency and they can't give clearances by themselves. For TMA crossings "Zurich Terminal" is the correct ATC-unit to contact in TMA-airspace around Zurich for VFR-traffic in class C. For crossings within the non-TMA and non-CTR airspaces (class C and D), "Zurich Delta" is the correct ATC-unit. They give for example clearances to cross corridors and in general class C airspace above FL100/FL130.

In Germany, the non-CTR airspaces in class D and C doesn't have published frequencies for VFR-charts at all, but they are mentioned within the IFR-arrival/departure charts as Radar frequency. For example around Suttgart, this would be "Langen Radar" on 125,050 or 119,200 and around Cologne/Bonn, this would be also "Langen Radar", but now on 135,350. The problem here is the German ATC-company "DFS", which want to force VFR-pilots to contact FIS first prior to cross airspace class C or D.

Unfortunately, I couldn't make it to the AERO in Friedrichshafen due to a very busy schedule at my work. I even forgot to mention it before and forgot about all my other open topics. My appologies for that.

I've figured out that "AirNavPro" (ANP) displays all the Approach frequencies for the German (non-CTR) TMAs, like Langen Radar "118,750" and "135,350" for Cologne/Bonn. It would be great to have this information also in SkyDemon, so pilots can contact the appropriate ATC-unit directly, instead of using FIS, which costs time and decrease the chances of a clearance. Did the DFS say something about this already to you guys? The frequencies are mentioned within the IFR SID and STAR-charts.

Furthermore, I've found out that SkyDemon does not display any frequency for general class C in Switzerland, which would be very usefull to get an "on op" clearance for the Alps. For the western part, this would be "Geneva Delta" on 119,175 and for the eastern part, this would be "Zurich Delta" on 119,225. The boundaries between Zurich and Geneva for Delta are the same as for Information (FIS).