Garmin G3X Pilot's Manual page 322

Annunciations & Alerts
Important CAS Messages my not be visible at all times (e.g., split-screen PFD Page is
not displayed, or FPL or NRST Pages are displayed on the full-screen PFD). In that case
a Check Alerts Triangle is displayed to the right of the Airspeed Indicator as a reminder
to check the CAS Messages.
If less than four CAS Messages are configured for the system, the CAS Messages
are displayed to the right of the Airspeed Indicator and the Check Alerts Triangle is not
displayed.
304
CAS Warning Example
CAS Warning Example (Check Alerts Triangle)
Garmin G3X Pilot's Guide 190-01115-00 Rev. G