Garmin G900X Pilot's Manual - page 16
Garmin G900X Pilot’s Guide
190-00726-00 Rev. A
1-4
SYSTEM OVERVIEW
•
GMU 44
– The Magnetometer measures local magnetic field and sends data to the AHRS for processing to
determine aircraft magnetic heading. This unit receives power directly from the AHRS and communicates with
it via an RS-485 digital interface.
•
GCU 476
– The optional Control Unit provides MFD/PFD and radio tuning control through an RS-232 digital
interface
•
GDL 69A
– The optional Data Link Satellite Radio Receiver provides real-time weather information to the
G900X MFD and PFD Inset Map, as well as digital audio entertainment. The Data Link Receiver communicates
with the MFD via a HSDB connection. A subscription to XM Satellite Radio Service is required to enable the
GDL 69A capability.