Garmin G1000 NXi Pilot's Manual page 270

HAZARD AVOIDANCE
No Coverage
Above 55°N
Precipitation
Above 52°N
Always Displays
as Mixed
NEXRAD (FIS-B)
The NEXRAD weather product cannot be displayed at the same time as relative terrain on the same
NOTE:
map.
The National Weather Service (NWS) operates the WSR-88D, or NEXRAD (NEXt-generation RADar)
system, an extensive network of 156 high-resolution Doppler radar systems. The NEXRAD network provides
centralized meteorological information for the continental United States and selected overseas locations. The
maximum range of a single NEXRAD site is 250 nm.
Individual NEXRAD sites supply the network with radar images, and the images from each radar site may
arrive at the network at different rates and times. Periodically, the weather data provider to FIS-B compiles
the available individual site images from the network to form a composite image, and assigns a single time
to indicate when it created the image. This image becomes the NEXRAD weather product. Individual
images--gathered from each NEXRAD site--differ in age, and are always older than the displayed NEXRAD
weather product age. The data provider then sends the NEXRAD data to the FIS-B GBTs, which transmit this
information during the next designated broadcast time for the NEXRAD weather product.
Because of the time required to detect, assemble, and distribute the NEXRAD weather product, the displayed
weather information contained within the product may be older than the current radar synopsis and may not
depict the current weather conditions. NEXRAD information should never be used as a basis for maneuvering
in, near, or around areas of hazardous weather regardless of the information it contains.
256
Figure 6-10 NEXRAD Weather Product - Canada
Garmin G1000 NXi Pilot's Guide for the Cessna Nav III 190-02177-00 Rev. A