Pilot's Guide

Garmin G1000H
™
Pilot’s Guide for the Bell 407GX
190-01255-01 Rev. A352
HAZARD AVOIDANCE
Displaying Precipitation weather information:
1) Select the MAP Softkey (for the PFD Inset Map, select the INSET Softkey). This step is not necessary on the
Weather Data Link (CNXT) Page.
2) Press the PRECIP Softkey.
Radardatashownrepresentslowestlevel,basereectivity,ofradarreturns.Thedisplayoftheinformation
is color-coded to indicate the weather severitylevel.All weather productlegendscan be viewed on the
WeatherDataLink(CNXT)Page.ForthePrecipitationlegend(Figure6-63),selectthe LEGEND Softkeywhen
Precipitationisselectedfordisplay.
No Radar Coverage
Figure 6-63 Precipitation Data Legend
Boundary of Connext
Data Request
The display of No Radar Coverage is enabled when Precipitation is selected for display.  Areas where
precipitationradarcoverageisnotcurrentlyavailableorisnotbeingcollectedareindicatedingrayshadeof
purple.AwhiteboundarylinewithwhitetickmarksdepictstheselectedcoverageareaoftheConnextData
Request.Thisboundaryenclosestheprecipitationdatawhenthisweatherproductisdisplayed.
ReFlectivity
Reectivityistheamountoftransmittedpowerreturnedtotheradarreceiver.ColorsonthePrecipitation
displaydirectlycorrelatetothelevelofdetectedreectivity.Reectivityasitrelatestohazardousweather
canbeverycomplex.
Theroleofradarisessentiallytodetectmoistureintheatmosphere.Simplyput,certaintypesofweather
reectradarbetterthanothers.Theintensityofaradarreectionisnotnecessarilyanindicationofthe
weatherhazardlevel.Forinstance,wethailreturnsastrongradarreection,whiledryhaildoesnot.Both
wetanddryhailcanbeextremelyhazardous.
Thedifferentradarechointensitiesaremeasuredindecibels(dB)relativetoreectivity(Z).Weather
radars measure the reflectivity ratio, or the energy reflected backto theradarreceiver( designatedbythe
letterZ) .ThevalueofZincreasesasthereturnedsignalstrengthincreases.
PReciPitatiOn limitatiOns
Radarimagesmayhavecertainlimitations: