Garmin G300 - Hazard Avoidance

Garmin G300 Pilot’s Guide
190-00921-00 Rev. D 133
Hazard Avoidance
System
Overview
Flight
Instruments EIS
COM
Interface
GPS
Navigation
Flight
Planning
Hazard
Avoidance
Additional
Features
Integrated
Autopilot Annun/Alerts Appendix Index
The display of radar coverage is always active when NEXRAD is selected. Areas
where NEXRAD radar coverage is not currently available or is not being collected
are indicated in grayish-purple (Weather (WX) Page Only). Radar capability exists
in these areas, but it is not active or is off-line.
neXRAD Ab n o R m A l i t i e S
There are possible abnormalities regarding displayed NEXRAD images. Some,
but not all, of those include:
•Groundclutter
•Strobesandspuriousradardata
•Sunstrobes,whentheradarantennapointsdirectlyatthesun
•Militaryaircraftdeploymetallicdust(chaff)whichcancausealterationsin
radar scans
•Interferencefrombuildingsormountains,whichmaycauseshadows
neXRAD li m itAt i o n S
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cientinformationtodetermine
cloud layers or precipitation characteristics (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,
and has no information about storms directly over the site.
•Radarcoverageonlyextendsto55°N.
•Anyprecipitationdisplayedbetween52°Nand55°Nisunknown.