I'm noticing that "sim/cockpit2/radios/indicators/hsi_display_horizontal_pilot" is not staying in sync with "RXP/radios/indicators/hsi_display_horizontal_pilot". When the RXP dataref is at 0 the xplane ref is still at 1. This issue seems to manifest itself when the GTN CDI is set to GPS but with no flight plan in the GTN.