I have the iPad XFIS app for use with X-Plane. In the EFIS app you can set the Nav frequencies. I have noticed that the XFIS app and the C400 disagree about which frequency is primary and which is backup. When you switch between primary and backup frequencies you can see the order is reversed. When you do with this one of the standard Xplanes (like The Jet), the order is correct, so I wonder if the C400 has a bug in how these frequencies are being reported (primary/secondary). The Com frequencies work correctly. David
