xplane 11 / GTN 750 / Carenado-V35 / HSI
Normally the GTN 750 / HSI interaction is fine (I've got an OBS issue, but that's a topic for a different thread).
However, when locating the airplane at KGUC I get a nav flag on the HSI, and location on the GTN 750 map shows off airport. Once 'in the air', both HSI and GTN displays agree and HSI / nav behaves normal EXCEPT for the HSI continuing to display the NAV flag. Even tuning to a VOR and switching to VLOC doesn't change this behavior.
What could be causing this?