190-01115-01 G3X™/G3X Touch™ Avionics Installation Manual
Rev. AV Page E-2
E.1 Equipment Description
NOTE
There is no TSO/ETSO applicable to the GDU 37X.
NOTE
GPS data is used for ADAHRS sensor drift correction, so at least one source of GPS data
is required. This requirement can be met by installing a GPS 20A, or by connecting a GPS
antenna to at least one GDU GPS receiver. In a system with multiple GDU displays,
additional GPS antennas may be connected to the other displays for redundancy, if
desired.
The GDU 37X provides a central display and user interface for the G3X™ avionics system. The display is
mounted flush to the aircraft instrument panel using four #6 captured screws with a 3/32” hex head. The
GDU 37X is available in two models, GDU 370 and GDU 375. The GDU 370 is a Garmin Display Unit
with a VFR WAAS-GPS receiver. The GDU 375 provides these same features plus an SiriusXM
®
receiver.
E.1.1 Navigation Functions
• Display of position and ground speed
• Display of stored navigation and map databases
• Area navigation functions using the determined position/velocity and stored navigation data
• Advisory approach navigation functions and associated databases
• Display of flight plan and navigation from an external GPS navigator
• Display of navigation data from an external VOR/ILS NAV radio
E.1.2 Interface Summary
NOTE
A G3X system installation can use either GDU 37X or GDU 4XX displays, but a G3X
system installation cannot use GDU 37X and
GDU 4XX displays.
The GDU 37X uses CAN and RS-232 interfaces to communicate with Garmin LRUs and other devices.
Refer to Section 2
, Section 24, Appendix G, Section 25, and Appendix H for interconnect and
configuration information.
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