Garmin G3X Pilot's Manual page 202

Hazard Avoidance
neXraD i
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.
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.
ECHO TOPS
Echo Tops are derived from NEXRAD radar and indicate the highest altitude at which
precipitation is falling. Echo Tops at or above the altitude you select are displayed, in
5,000 foot increments up to 70,000 ft. Echo Tops can be helpful in determining the
severity of thunderstorms.
184
ntenSity
RADAR Legend
RADAR Legend
Garmin G3X Pilot's Guide
NEXRAD Data
Satellite Mosaic/Cloud Tops Data
190-01115-00 Rev. G