Garmin Legacy Software Versions Guide de l'utilisateur Page 296

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Garmin G1000 Pilot’s Guide for Cessna Nav III 190-00498-00 Rev. A8-18
OPTIONAL EQUIPMENT
CELL MOV – pressing the CELL MOV softkey
shows the storm cells identified by the ground-
based system. The movement is depicted by an
arrow. The update rate is every 12 minutes.
SIG/AIR – pressing the SIG/AIR softkey shows
SIGMET and AIRMET information to advise
the pilot of potentially hazardous weather.
The
advisory covers an area of at least 3,000 square
miles at any one time. The update rate is every 12
minutes.
NOTE: SIGMETs are broadcast for hazardous
weather that is considered of extreme importance
to all aircraft. SIGMETs (acronym for “SIGnificant
METeorological information”) warn of the fol
-
lowing weather hazards: severe icing, severe and
extreme turbulence, dust storms, sandstorms, or
volcanic ash lowering visibility to less than 3
miles. A Convective SIGMET (WST) is issued for
hazardous convective weather (such as torna-
does, thunderstorms, hail) and covers severe or
great turbulence, severe icing, and low-level wind
shear. A localized SIGMET is a significant weather
condition occurring at a localized geographical
position.
NOTE: AIRMETs are broadcast for weather
phenomena that potentially affects all aircraft.
For pilots of light aircraft, AIRMET (acronym for
AIRmans METeorological information) gives
valuable information about the following con-
ditions: moderate icing, moderate turbulence,
sustained winds 30 knots or greater at the sur-
face, widespread area with a ceiling of less than
1,000 feet and/or visibility less than 3 miles and
extensive obscurement of mountains. These are
important to light aircraft, as they have limited
flight capabilities due to lack of equipment and/or
instrumentation.
When enabled, the following AIRMETs can be
displayed:
Icing
Turbulence
IFR conditions
Mountain obscuration
Surface winds
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