Garmin G1000 Reference Manual page 142

SECTION 6 – MFD
OPTIONAL INTERFACES
ECHO TOP – press the ECHO TOP softkey to show
the location, elevation, and direction the highest
radar echo. This may not indicate the top of a storm
or clouds, only the highest radar return echo. The
information is derived from NEXRAD information
and indicates the highest altitude at which precipi-
tation is falling. ECHO TOPS and Radar coverage
are activated at the same time. ECHO TOPS are
mutually exclusive from both NEXRAD and CLOUD
TOPS, that is, when ECHO TOPS is activated,
NEXRAD and CLOUD TOPS are removed. Refer
to the Legend for a description of the ECHO TOPS
coding. The update rate is every 7.5 minutes.
NOTE: Cloud Tops and Echo Tops use the same
color scaling to represent altitude. Turning on
both products at the same time is not allowed.
126 Garmin G1000 Cockpit Reference Guide for Cessna Nav III
RADAR COVERAGE – The display of Radar Coverage
is always active when NEXRAD and ECHO TOPS
are selected and indicates the currently available
NEXRAD Radar coverage and ECHO TOPS areas
by showing the area in a grayish-purple color where
information is not being collected. Areas where radar
capability exists, but is not active or is off-line, will
not be shown as available. Areas where radar cover-
age is not available will be shown in grayish-purple.
The update rate is every five minutes.
CLD TOP – press the CLD TOP softkey to show the
cloud top altitude determined from satellite imagery.
Refer to the legend for a description of the CLOUD
TOPS color coding. The update rate is every 15
minutes.
LTNG – pressing the LTNG softkey shows the location
of cloud-to-ground lightning strikes. The update
rate is every five minutes.
NOTE: Strike location falls within a 2 km region.
Therefore, the exact location of the strike is not
displayed.