Garmin G3X Touch Pilot's Manual page 421

When Smart Glide is active, the Glide button replaces the Message (MSG) button
on the Data Bar. If a message appears that would cause the MSG button the flash,
the Glide button is replaced with the MSG button until the pilot views the message.
AUTOPILOT OPERATION UPON SMART GLIDE ACTIVATION
The GFC 500 autopilot engages servos when the aircraft is more than 2 nm from the
destination airport. Coupling will not occur if less than 2 nm; however, the autopilot
will remain coupled if servos are already engaged. Flight director modes activate as
follows:
• ROL mode (no airport in range) or GPS mode (airport in range)
• IAS (regardless of airport/no airport in range)
190-02472-00 Rev. D
Glide Button
Garmin G3X Touch ™ Pilot's Guide for Certified Aircraft
Appendix F
399