Garmin G500 Pilot's Manual page 306

Standard Terrain - SVT is integrated within SVT to provide visual and audible
alerts to indicate the presence of terrain threats relative to the projected flight
path. In addition to the Terrain - SVT alerts, SVT offers a three-dimensional view
of terrain and obstacles. Terrain and/or obstacles that pose a threat to the aircraft
in flight are shaded yellow or red.
NOTE: SVT will become disabled if the databases necessary to display SVT
are unavailable (generating a GDU DB ERR or SVT DISABLED alert) or AHRS
or GPS data is unavailable. SVT may be restored once the fail conditions are
removed by reactivating SVT as explained in the SVT Operation section.
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Figure 5-36 Synthetic Vision Imagery - PFD
Garmin G500 Pilot's Guide 190-01102-02 Rev. E