Garmin G500 Pilot's Manual page 94

Topo Scale
The Topo Scale option selects whether the elevation scale for topographical
features on the Navigation Map is displayed. The scale will be located on the
right side of the display.
Minimum/Maximum
Range of Topography
Displayed on the Map
Sky Indication
Range of Topography
Current Aircraft Altitude
Displayed on the Map
Current Ground Level Indication
Figure 3-29 Navigation Map Topo Scale
Figure 3-30 Navigation Map Topo Scale Selection
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Garmin G500 Pilot's Guide 190-01102-02 Rev. E