Garmin GTX GTX 330D Pilot El Kitabı Eki - Sayfa 19

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To display the NEXRAD Intensity Legend:

While viewing the XM Weather page, press the

MENU key to display the Page Menu.

Turn the large or small knob to select "Display

legend?"

Press ENT to display the NEXRAD Intensity

Legend.

Turn the large or small knob to scroll through

the full table. Press CLR to return to the normal

view.

NEXRAD Abnormalities

There are possible abnormalities regarding dis-

played NEXRAD images. Some, but not all, causes of

abnormal displayed information include:

• Ground Clutter

• Strobes and spurious radar data

• Sun strobes, when the radar antenna points

directly at the sun

• Military aircraft deploy metallic dust which can

cause alterations in radar scans

• Interference from buildings or mountains,

which may cause shadows

• Scheduled maintenance may put a radar off-line

NEXRAD Limitations

Certain limitations exist regarding the NEXRAD

radar displays. Some, but not all, are listed for the

user' s awareness:

• NEXRAD base reflectivity does not provide suf-

ficient information to determine cloud layers or

precipitation characteristics (hail vs. rain, etc).

• NEXRAD base reflectivity is sampled at the

minimum antenna elevation angle. An indi-

vidual NEXRAD site cannot depict high altitude

storms at close ranges, and has no information

about storms directly over the site.

• Neither NEXRAD weather data nor the age of

the NEXRAD weather data are displayed at a

zoom range of less than 10 NM. The resolu-

tion of displayed NEXRAD data is 2 kilometers.

Therefore, when zoomed in on the display,

each square block is 2 kilometers. The intensity

level reflected by the square will be the high-

est level sampled within the 2 kilometer square

area.

XM Weather METARs

XM Weather METARs (Meteorological Aerodrome

Reports) are available on the XM Weather page. When

enabled (that is, when "METAR" is shown in the upper

left corner of the page), airports with METAR infor-

mation above a certain severity level are marked with

colored flags on the display. Refer to the XM Weather

legend for a description of the color code. The update

rate is every 12 minutes.

190-00356-30 Rev C

Part Two: Section 2

XM Weather