190-01115-01 G3X™/G3X Touch™ Avionics Installation Manual
Rev. AV Page 2-13
2.1.1.19 Audio
The G3X system interacts with the aircraft’s audio system in the following ways:
• Audio alerts are generated by the GDU displays for various events, including audio notification of
abnormal conditions. Typically, alert audio from the PFD1 GDU is wired to the aircraft’s audio
panel or intercom.
• Stereo audio for XM music is provided by the GDU 3X5 and GDU 4X5 displays, and can be
connected to any stereo audio panel or intercom.
• A G3X Touch system with GDU 4XX displays may be connected using the CAN bus to the
GMA™ 245/245R audio panel, allowing full control of audio panel functionality from the GDU
display. The GMA 245 is a panel-mounted digital audio panel with intercom and Bluetooth input;
the GMA 245R has the same capabilities but is remote-mounted with no front-panel controls. For
further information, refer to Section 30.4.25
, the GMA 245/245R Pilot’s Guide (190-01879-10),
and Installation Manual (190-01879-11).
• The GTR 20 and GTR 200 COM radios contain a built-in two-place intercom with alert audio and
stereo music inputs. For simple two-place VFR aircraft, the GTR 20 or GTR 200 can provide all
audio functionality, with no separate audio panel required. For installations with more complex
audio switching requirements, including multiple COM radios, NAV radios, or 4+ seat aircraft, a
separate audio panel is recommended.
2.1.1.20 Video
In a G3X Touch system with GDU 4XX displays, each display has a rear connector which supports
composite (NTSC/PAL/SECAM) video. Video input to a GDU 4XX display can be used with various
cameras or entertainment systems, with the video image displayed on a dedicated MFD page, or in an inset
window on the GDU 46X PFD. Wireless remote control of Garmin VIRB® action cameras is also
supported, allowing recording to be started or stopped from the GDU 4XX display.
2.1.1.21 Carbon Monoxide Detector
A CO Guardian or other compatible carbon monoxide detector can be connected to a GDU display using
RS-232, and its data relayed to other displays through the CAN bus. Alerts will appear on the PFD display
for excessive carbon monoxide levels, and the current CO level can be displayed in a data field. Cabin
Altitude as determined by a CO Guardian can be displayed in a data field. CO detectors with pulse
oximeter functions are also supported. For installation information, consult the CO detector manufacturer.
2.1.1.22 Emergency Locator Transmitter (ELT)
The G3X system can provide NMEA 0183 formatted GPS position data to an ELT through an RS-232
output from a GDU display. In an installation with a GTN/GNS navigator, an RS-232 output from the IFR
GPS using the “Aviation” data format may be preferred. For further ELT interface guidance, consult the
ELT manufacturer.
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