Garmin G1000H Marine Radio User Manual


  Open as PDF
of 548
 
Garmin G1000H
™
Pilot’s Guide for the Bell 407GX
190-01255-00 Rev. B296
HAZARD AVOIDANCE
neXRaD limitatiOns
NEXRADradarimagesmayhavecertainlimitations:
•NEXRADbasereectivitydoesnotprovidesufcientinformationtodeterminecloudlayersorprecipitation
characteristics(wethailvs.rain).Forexample,itisnotpossibletodistinguishbetweenwetsnow,wet
hail, and rain.
•NEXRADbasereectivityissampledattheminimumantennaelevationangle.AnindividualNEXRAD
sitecannotdepicthighaltitudestormsatcloseranges.Ithasnoinformationaboutstormsdirectlyover
the site.
•Whenzoomedintoarangeof30nm,eachsquareblockonthedisplayrepresentsanareaoffoursquare
kilometers.Theintensitylevelreectedbyeachsquarerepresentsthe
highest
levelofNEXRADdata
sampledwithinthearea(Figure6-12).
Figure 6-12 NEXRAD Data - Zoomed
Block Area is 4 km
2
ThefollowingmaycauseabnormalitiesindisplayedNEXRADradarimages:
•Groundclutter
•Strobesandspuriousradardata
•Sunstrobes(whentheradarantennapointsdirectlyatthesun)
•Interferencefrombuildingsormountains,whichmaycauseshadows
•Metallicdustfrommilitaryaircraft,whichcancausealterationsinradarscans
 previous next