BENDIXKing AeroNav 910 Pilot's Manual page 93

If the ARS data (mark pitch, roll and heading) becomes invalid,
the ARS page will display a red "X". Once the aircraft has
returned to straight and level flight, press the "Restart ARS"
button or soft key and maintain straight and level flight for at least
30 seconds.
NOTE
SynVis Depiction Unavailable In GPS Alignment
SynVis depictions will not be available until the GPS
has reached SBAS state (SBAS/WAAS
configurations), or FDE state (non-SBAS/WAAS
configurations).
NOTE
Flight Plan Depictions
The depiction of the flight plan in any SynVis display
is placed 1000 feet below aircraft altitude. This
means that it will not be visible when flying under
1000 feet AGL during takeoff, enroute and approach
phases, nor will it be visible during ground
operations or may appear to go underground when
descending or when low over variable terrain.
89000039-010
Rev 1 May 2019
AeroNav 900/880 Series Pilot's Guide
SVS Subsystem 2-25