
Garmin G1000 NXi Pilot’s Guide for the Cessna NAV III
190-02177-02 Rev. A
SY
STEM
O
VER
VIEW
FLIGHT
INSTRUMENTS
EIS
AUDIO P
ANEL
& CNS
FLIGHT
MANA
GEMENT
HAZARD
AV
OID
ANCE
AFCS
ADDITIONAL FEA
TURES
APPENDICES
INDEX
280
HAZARD AVOIDANCE
p
recipitation
l
iMitations
Radar images may have certain limitations:
Radar composite reflectivity does not provide sufficient information to determine precipitation
characteristics (wet hail vs. rain). For example, it is not possible to distinguish between wet snow, wet
hail, and rain.
An individual radar site cannot depict high altitude storms at close ranges. It has no information about
storms directly over the site.
At smaller map ranges, individual blocks of radar data are viewable. Each block of radar information
represents approximately four square kilometers and depicts the highest level of reflectivity detected
within that area.
Figure 6-20 Precipitation Weather Product at 10 NM Map Range
Block represents
approximately 4 km
2
The following may cause abnormalities in displayed 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 (chaff) from military aircraft, which can cause alterations in radar scans.