Garmin G3X Touch Pilot's Manual page 230

Hazard Avoidance
METAR Data
airMetS
An AIRMET (AIRmen's METeorological Information) can be especially helpful for
pilots of light aircraft that have limited flight capability or instrumentation. An AIRMET
must affect or be forecast to affect an area of at least 3,000 square miles at any one
time. AIRMETs are routinely issued for six-hour periods and are amended as necessary
due to changing weather conditions. AIRMETs are displayed as colored, dashed lines.
AIRMET Data
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Garmin G3X Touch Pilot's Guide 190-01754-00 Rev. L