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• Winds Aloft (WINDS). The Winds Aloft

selection provides the pilot with wind speed

and direction. The winds at a given altitude

are selected in the Winds Aloft Alt below the

WINDS selection. The selected altitude is

shown along with the product time.

• Textual Meteorological Aerodrome Reports

(METARs). When you zoom in to show the

airport symbol associated with the colored flag

for a graphical METAR, and move the Map

Pointer to highlight that airport, you can then

press ENT to see the Textual METAR page for

that airport. The Textual METAR page is one of

the airport pages of the WPT page group.

• Graphical Meteorological Aerodrome

Reports (METARs). The XM Weather page (in

the NAV page group) can show colored flags

to indicate the level of current weather condi-

tions at those airports for which textual METAR

reports are available. The flags are color-coded

to indicate the severity of the current weather at

the airport: cyan for VFR conditions, green for

Marginal VFR conditions, yellow for IFR condi-

tions, or magenta of Low IFR conditions.

• Terminal Aerodrome Forecast (TAFs). A

TAF page is added among the airport pages of

the WPT page group. The TAF page differs from

the Textual METAR page in that it describes

forecast future weather conditions rather than

current conditions.

• Temporary Flight Restrictions (TFRs). The

boundaries of areas with TFRs are outlined in

yellow on the Map and XM Weather pages of

the NAV page group. In the 500W-series, TFR

boundaries are also shown on the NAV main

page. You can obtain more information about a

TFR by bringing up the map cursor, moving the

map cursor to within the yellow outlined area,

and pressing the ENT key.

Weather Product Age

The age of the displayed weather product—or the

effective time of Winds Aloft predictions—is shown

in the upper right corner of the display. For example,

if NEXRAD is displayed, "0:05" indicates that the data

are five minutes old. If Winds Aloft predictions are

being displayed, "10:00" indicates the effective time

for the displayed prediction is 10:00 AM.

The data for each XM Weather product are updated

regularly from the GDL 69/69A. XM Weather products

expire after the following intervals:

Product

METARs

NEXRAD/Radar Coverage

TFRs

TAFs

Lightning

SCITs

Winds Aloft Predictions

When the age of the displayed XM Weather prod-

uct reaches one half of its expiration time, the color

of the displayed time changes from green to amber.

Expired XM Weather products are never displayed. In

the unlikely event that the data should expire before

a fresh update is received, the time will be dashed out

and the data removed from the display.

XM NEXRAD Weather

The National Weather Service' s network of WSR-

88D Doppler weather surveillance radars—also called

NEXRAD, for Next Generation Radar—has greatly

improved the detection of meteorological events such

as thunderstorms, tornados, and hurricanes. An exten-

sive network of NEXRAD weather radars provides

190-00356-30 Rev C

Part Two: Section 2

XM Weather

Expiration Interval

90 minutes

30 minutes

60 minutes

30 minutes

90 minutes