Garmin G3X Touch Pilot's Manual page 218

Additional Features
SYNTHETIC VISION TERRAIN AND OBSTACLE DATA
Terrain alerting on the synthetic vision display corresponds to the red and yellow X
symbols on the Inset Map (GDU 46X only) and Navigation Map. For more detailed
information regarding Synthetic Vision Terrain and Obstacle Data, refer to the Hazard
Avoidance Section.
In some instances, a terrain or obstacle alert may be issued with no conflict shading
displayed on the synthetic vision. In these cases, the conflict is outside the Synthetic
Vision field of view and the alert will have arrows indicating the direction of the alert.
Terrain
Annunciation
Potential
Impact
Points
Pop-up Alert
200
PFD Terrain Alert
MFD Terrain Alerts
Garmin G3X Touch Pilot's Guide
Terrain
Warning
190-01754-00 Rev. E