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G3X Installation Manual – GMU 44 Page 3-1
190-01115-01 Revision A
3. GMU 44
Figure 3-1. GMU 44 Unit View
3.1 Equipment Description
The Garmin GMU 44 Magnetometer is a remote mounted device that interfaces with a Garmin GSU 73 to
provide flight attitude and heading data for flight instrumentation.
An Attitude and Heading Reference System combines the functions of a Vertical Gyro and a Directional
Gyro to provide measurement of Roll, Pitch and Heading angles. The Garmin ADAHRS and
magnetometer replace traditional rotating mass instruments.
Using long-life solid-state sensing technology, the GMU 44 Magnetometer uses magnetic field
measurements to create an electronically stabilized AHRS.
The GMU 44 magnetometer provides magnetic information to support the function of the GSU 73. The
GSU 73 provides operating voltage to the GMU 44 Magnetometer.
3.1.1 Interface Summary
The following is an interface summary for the GMU 44.
• GMU 44 to GSU 73 Interface: Power, RS-232, RS-485 (19,200 baud)
3.2 Electrical Specifications
Table 3-1. GMU 44 Electrical Specifications
Specification Characteristic
Power Requirements
Supply Voltage: 14/28 VDC. See Table 1-3 for current
specifications.