Does this indication not merely indicate, as appropriate, a VOR or an ILS frequency, tuned on the appropriate NAV box?
Next time you fly try selecting your local VOR, followed by the nearest ILS frequency and observer if the indicator acknowledges the fact and changes over.
Our displays default to "NAV" / "ILS" on start (depending on the selected "NAV" box selection). We normally change the display over to "FMS" on the control panel so we can observe the flight director following the programmed route.
Last edited by ShyTorque; 6th Oct 2005 at 22:29.