Garmin G500 Pilot's Manual page 96

Terrain Scale
The Terrain Scale option selects whether the Terrain Scale is shown on the
Navigation Map. The Terrain scale will be located on the right side of the display.
Figure 3-33 Navigation Map Terrain Scale Selection
Figure 3-34 Navigation Map Terrain Scale
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Garmin G500 Pilot's Guide 190-01102-02 Rev. E