Garmin G500 Pilot's Manual page 89

Lat/Lon Viewing Range
The Lat/Lon Viewing Range option selects whether Lat/Lon line is shown on
the MFD. Lat/Lon lines will be shown at and below the selected map range. Map
ranges above the selected value will not show the Lat/Lon lines. When Off is
selected, Lat/Lon lines will not be shown. In the figure below where 200 NM is
selected, Lat/Lon lines will be shown at map ranges of 200 NM and lower.
Figure 3-38 Navigation Map Lat/Lon Selection
Lat/Lon Reference Information
Figure 3-39 Navigation Map Lat/Lon Information
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190-01102-02 Rev. B Garmin G500 Pilot's Guide