190-01115-01
G3X/G3X Touch Installation Manual - Installation Preparation
Rev. AC
Page 2-11
further information, refer to the GMA 245/245R Installation Manual (190-01879-10) and Pilot’s
Guide (190-01879-11).
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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.
2.1.1.19 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.
2.1.1.20 Carbon Monoxide Detector
A CO Guardian or other compatible carbon monoxide detector can be connected to a GDU display via
RS-232, and its data relayed to other displays via 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. CO detectors
with pulse oximeter functions are also supported. For installation information, consult the CO detector
manufacturer.
2.1.1.21 Emergency Locator Transmitter (ELT)
The G3X system can provide NMEA 0183 formatted GPS position data to an ELT, via 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.
2.1.1.22 Bluetooth
The GDU 4XX displays in a G3X Touch system include Bluetooth transceivers. This allows a wireless
connection to a tablet computer, using Garmin Pilot or another application that supports the Garmin
Connext protocol. The tablet computer can receive GPS position and attitude data from the G3X Touch
system, and can exchange flight plan information with the GDU 4XX or with a connected GTN navigator.
In an installation with multiple GDU 4XX displays, the Bluetooth connection to the tablet computer should
be made to the PFD1 GDU only. Refer to the G3X Touch Pilot’s Guide (190-01754-00) for Bluetooth
connection information.
A tablet computer can also establish a separate Bluetooth connection to a GDL 39R/51R/52R ADS-B
receiver, or to a GTX 45R/345/345R transponder. This allows the display of ADS-B traffic and weather
data on the tablet computer, using Garmin Pilot or another application that supports the Garmin Connext
protocol.
In a G3X Touch system with a GDL 39R ADS-B receiver, the primary connection between the GDL and a
single GDU 4XX display is via RS-232. However, Bluetooth may also be used to connect additional
GDU 4XX displays to the GDL 39R, in order to view FIS-B weather data on multiple displays.
2.1.1.23 Standby Instruments
Although there is no regulatory requirement to equip the aircraft with backup flight instruments, Garmin
strongly recommends the installation of backup instruments for aircraft that will be flown in other than
