190-01115-01 G3X™/G3X Touch™ Avionics Installation Manual
Rev. AV Page 2-14
2.1.1.23 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™ app 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 through 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.
2.1.1.24 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
Day VFR conditions. In case of an electrical system failure, or in the unlikely event of an issue with the
G3X system, backup instruments should at minimum provide a secondary reference for aircraft attitude,
airspeed, and altitude.
The G5 standby flight display is designed as a complementary backup instrument for the G3X system. It
features dissimilar hardware and software design to eliminate common-mode failures, supports an optional
built-in backup battery, and synchronizes data such as baro setting and selected heading with the G3X
system. In conjunction with a GMC mode control panel, the G5 is also capable of driving the GSA 28
autopilot servos even if power is removed from all GDU displays. A G3X Touch system with no
ADAHRS units can also operate the GSA 28 autopilot servos if a G5 and a GMC mode control panel are
present. For further information, refer to the G5 installation/operation manual (190-02072-00).
The GI 275 is also capable of being installed as a standby flight display with GDU 4XX systems. The
altitude bug, heading track bug, and barometric setting are synced between the two displays. The G3X
Touch syncs course, minimum's bug, CDI selection, and VFR GPS guidance to the GI 275, in addition to
sending OAT and magnetic heading to the GI 275. A connection can optionally be made from the GSU 25
serial port to the GI 275, to facilitate comparison between the two ADAHRS sources to notify the pilot of a
disagreement in attitude, altitude or airspeed. Unlike the G5, the GI 275 cannot act as a backup flight
director when installed alongside a G3X Touch system in the case of a primary display failure.
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