Garmin G300 Pilot's Manual page 180

additional Features
SyNTHETIC VISION TERRAIN AND OBSTACLE DATA
Terrain alerting on the synthetic terrain display corresponds to the red and
yellow X symbols on the Inset Map 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 terrain. In these cases, the conflict is outside
the Synthetic Vision field of view.
Potential
Impact
Points
162
Synthetic Vision Terrain Alerts
Garmin G300 Pilot's Guide
Terrain
Annunciation
Terrain
Warning
Terrain
Caution
190-00921-00 Rev. D