Garmin G3X Pilot's Manual page 330

Integrated Autopilot
LOC
Mode
Armed
GPS
Mode
Active
Once LOC is the navigation source, the localizer and glideslope can be captured.
Upon reaching the glideslope, the autopilot transitions to Glideslope Mode and begins
to intercept and track the glideslope.
Selected
Navigation
Source
Approach Mode
Softkey
310
ILS Armed and GPS Mode Active
Localizer Mode Glideslope Mode
Active
Glideslope Mode Active
PFD Page (Split-Screen)
Garmin G3X Pilot's Guide
Active
Glideslope
Mode
Armed
Glideslope
Indicator
190-01115-00 Rev. J