Peter wrote: A GNS box has no “VFR/IFR” config, so this is doubly bizzare. I suspect the reason was a subtle one, along the lines of the issue here. Did the installer do the DER package design, used a US based DER, or did they buy the DER 8110 from another shop? I wonder if @wigglyamp could shine some light on what the reason might have been? As far as I’m aware, an 8110-3 from a DER is...