Garmin G3X Pilot's Manual page 220

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.
S M
atellite
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.
198
ntenSity
RADAR Legend
oSaiC
RADAR Legend
Garmin G3X Pilot's Guide
NEXRAD Data
Satellite Mosaic/Cloud Tops Data
190-01115-00 Rev. K