I would very much like to have the VSR (Vertical Speed Required) index function be active when Skyview is using a flight plan from an IFR navigator over the ARINC bus. I can have the Skyview use the flight plan from my GNS 480 by selecting it as the map source. When the HSI source is set to the GNS 480 the autopilot follows it flawlessly including holds etc. The one feature lost is the VSR index which comes on as I near destination using the Skyview plan as the source. This is a very valuable feature.