Garmin G3X Touch Pilot's Manual page 221

Hazard Avoidance
E T
CHO OPS
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.
Echo Tops Data
199
Garmin G3X Touch ™ Pilot's Guide for Certified Aircraft
190-02472-00 Rev. D