Garmin G500 Pilot's Manual page 180

METAR Viewing Range
The METAR Viewing Range option allows you to select the map range where
at and below that value METAR weather products will be shown on the selected
MFD Wx Data Link Map page (1, 2, or 3). When Off is selected, METARs will
not be shown. In the figure below where 150 NM is selected, METAR data will
be shown at map ranges of 150 NM and lower.
Figure 4-39 METAR Viewing Range Selection
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Garmin G500 Pilot's Guide 190-01102-02 Rev. B