Garmin G1000 Pilot's Manual page 14

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.
• GDL 69A – The Data Link Satellite Radio Receiver provides real-time weather information to MFD maps and the
PFD Inset Map, as well as digital audio entertainment. The Data Link Receiver communicates with the MFD
via an HSDB connection. A subscription to XM Satellite Radio Service is required to enable Data Link Receiver
capability.
• GSA 81 and GSM 85 – The GSA 81 servos are used for automatic control of pitch, pitch trim, and roll. These
units interface with each IAU.
The GSM 85 servo mounts are responsible for transferring the output torque of the servo actuators to the
mechanical flight-control surface linkages.
1-4 Garmin G1000 Pilot's Guide for the Beechcraft A36/G36 190-00595-00 Rev. A