Garmin G500 Pilot's Manual page 178

SIGMET/AIRMET Viewing Range
The SIGMET/AIRMET Viewing Range option allows you to select the map
range where at and below that value SIGMET/AIRMET products will be shown
on the selected MFD Wx Data Link Map page (1, 2, or 3). When Off is selected,
SIGMET/AIRMET will not be shown. In the figure below where 300 NM is
selected, SIGMET/AIRMET data will be shown at map ranges of 300 NM and
lower.
Figure 4-37 SIGMET/AIRMET Viewing Range Selection
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Garmin G500 Pilot's Guide 190-01102-02 Rev. B