There is a lot to like about the IFD540, including clever mode/rocker bezel switches, plus softkeys that Avidyne calls Hybrid Touch, for the ability to also touch onscreen labels. The configurable moving map data fields put a huge amount of information in the pilots glance and comm frequency decoding is useful. The ability to see the graphical route-as we’ll as the flight plan simultaneously-is a huge improvement and having altitudes displayed on an approach could conceivably prevent a tragedy one day. But I also uncovered some warts that left me scratching my head.