Garmin GTX 330 GPS Receiver User Manual


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16
Part Two: Section 2
XM Weather
XM Weather Label and NEXRAD Source
U.S.
XM Weather Label and NEXRAD Source
Canada
NEXRAD Limitations
CertainlimitationsexistregardingtheNEXRAD
radar displays. Some, but not all, are listed for the
user’s awareness:
•NEXRADbasereectivity does not provide suf-
ficient information to determine cloud layers or
precipitation characteristics (hail vs. rain, etc).
• NEXRADbasereectivity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ags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 F
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