Answer is yes.
1. Select your nav (ILS) as primary data source for your HSI
2. Select gps as secondary source. GPS data will be displayed as an RMI needle superimposed on the HSI, pointing to the gps waypoint. Distance to that waypoint is displayed just to the side of the HSI.
GPS waypoints are also on the moving map. I find it easiest to use the map for waypoints that overlie the localizer; the rmi for bearings to waypoints that are off the localizer (like a radial off a distant vor).
I should mention that I actually have a GRT Hx, but I think the Dynon works similarly. Itís in the Dynon manual.