Minimum Altitude Display And Alerting - Garmin G3X Touch Manual

The G3X Touch is capable of interfacing with several remote transponders providing Mode S
interrogation and reply capabilities. Transponder tuning for panel mount transponders is also
supported.
Ground Mode
Ground Mode is normally selected automatically when the aircraft is on the ground. The transponder
powers up in the mode it was in when shut down. A green GND indication and transponder code
appear in the mode field of the Transponder Data Box. In Ground Mode, the transponder does not
allow Mode A and Mode C replies, but it does permit acquisition squitter and replies to discretely
addressed Mode S interrogations.
Standby Mode (Manual)
In Standby, the transponder does not reply to interrogations, but new codes can be entered. When
Standby Mode is selected, a white STBY indication and transponder code appear in the mode field of
the Transponder Data Box.
ON Mode can be selected at any time. ON Mode generates Mode A and Mode S replies, but Mode C
altitude reporting is inhibited. In ON Mode, a green ON indication and transponder code appear in the
mode field of the Transponder Data Box.
Altitude Mode (Automatic or Manual)
ALT Mode is automatically selected when the aircraft becomes airborne. When the aircraft is on the
ground, the transponder automatically selects and displays GND. ALT Mode may also be selected
manually.
If Altitude Mode is selected, a green ALT indication and transponder code appear in the mode field of
the Transponder Data Box, and all transponder replies requesting altitude information are provided
with pressure altitude information.
Reply Status
When the transponder sends replies to interrogations, a green R indication appears momentarily in
the Transponder Data Box.
IDENT Function (GDU 460 and GDU 470)
Touching IDENT sends a distinct identity indication to Air Traffic Control (ATC). The indication
distinguishes the identing transponder from all the others on the air traffic controller's screen. After
touching IDENT the bar on the button turns green momentarily.
7.9

Minimum Altitude Display and Alerting

When enabled by the pilot, an altitude minimums bug will be displayed in cyan on the barometric
altitude tape.
Altitude minimums are accessed under the PFD Options Menu → Minimums sub menu and can be
set by touchscreen keypad or dual-concentric knob.
FAA Approved AFMS or Supplemental AFM for the Garmin G3X Touch EFIS 190-01754-01 Rev. 4
P a g e | 7-6