Garmin GXM 30A - Manual (Page 29)

GXM 30A XM Radio Smart Antenna Owner’s Manual 
AIRMET
An AIRMET (AIRman’s METeorological Information) can potentially affect all aircraft. This data 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 6 hour periods and are amended as necessary due
to changing weather conditions or issuance/cancellation of a SIGMET. AIRMETs are displayed as a colored dashed line. To view
AIRMET data, select the AIRMET using the map pointer. To view detailed information, press ENTER.
• AIRMET Sierra (IFR) (purple): Ceilings less than 1,000 feet and/or visibility less than 3 miles affecting over 50% of the area
at one time. Extensive mountain obscuration.
• AIRMET Tango (Turbulence) (orange): Moderate turbulence. Sustained surface winds of 30 knots or more at the surface.
• AIRMET Zulu (Icing) (blue): Moderate icing. Freezing levels.
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AIRMET detailed information AIRMET selected with map pointer