Garmin GXM 40 - Manual (Page 12)

0 GXM 40 Owner’s Manual
XM WX Weather Features
AIRMET
An AIRMET or 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 six-hour periods
and are amended as necessary due to changing weather conditions or the issuance or cancellation of a SIGMET (Significant
METeorological Forecast). AIRMETs are displayed as an colored, dashed line.
AIRMET Sierra (IFR) (purple): Ceilings less than 1,000 feet and/or visibility less than three 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
AIRMET Detailed Information AIRMET Selected
With Map Pointer