Garmin G300 Pilot’s Guide
190-00921-00 Rev. E
140
Hazard Avoidance
System
Overview
Flight
Instruments
EIS
COM
Interface
GPS
Navigation
Flight
Planning
Hazar
d
Avoidance
Additional
Featur
es
Integr
ated
Autopilot
Annun/Alerts
Appendix
Index
neXRAD l
imitAtionS
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 sufficient 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 reflectivity 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.
neXRAD i
ntenSity
Colors are used to identify the different NEXRAD echo intensities (reflectivity)
measured in dBZ (decibels of Z). “Reflectivity” (designated by the letter Z) is
the amount of transmitted power returned to the radar receiver. The dBZ values
increase as returned signal strength increases. Precipitation intensity is displayed
using colors corresponding to the dBZ values.
NEXRAD Data
RADAR Legend
SATELLITE MOSAIC
Satellite Mosaic displays infrared composite images of cloud cover taken by
geostationary weather satellites. The Satellite Mosaic provides up to seven levels
of cloud cover.
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