Cockpit Reference Guide

Garmin G1000 Cockpit Reference Guide for the Cessna Nav III
190-00384-12 Rev. A
10-20
SECTION 10 – HAZARD
AVOIDANCE
NOTE: Precipitation data cannot be displayed
on the Navigation Map Page at the same time
as terrain.
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 GFDS Weather Data Link Page.
2) Select the PRECIP Softkey.
Radar data shown represents lowest level, base
reflectivity, 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 GFDS
Weather Data Link Page. For the Precipitation legend,
select the LEGEND Softkey when Precipitation is selected
for display.
Figure 10-28 Weather Data Link Page(GFDS) PRECIP
Figure 10-29 Precipitation Data Legend
No Radar
Coverage
Boundary of
GFDS weather
data request
precipitation limitations
Radar images may have certain limitations:
• Radar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.
• Radarbasereectivityissampledattheminimum
antenna elevation angle. An individual radar 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 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frommilitaryaircraft,whichcancause
alterations in radar scans