Garmin G500 Pilot's Manual page 102

MOA (Military) Viewing Range
The MOA (Military) viewing range option selects whether MOA (Military)
information is shown on the Navigation Map. MOA airspace information will
be shown at and below the selected map range. When Off is selected, the
information will not be shown. In the example below where 200 NM is selected,
MOA airspace information will be shown at map ranges of 200 NM and lower.
Figure 3-59 Navigation Map MOA (Military) Viewing Range Selection
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Garmin G500 Pilot's Guide 190-01102-02 Rev. B