Garmin G3X Installation Manual page 151

9.3.3 Calibration Procedure C: Magnetometer Interference Test
Calibration Procedure C is only required for initial installation verification. This test
should also be repeated to verify all subsequent electrical changes associated with devices
within 10.0 feet of the GMU 44 magnetometer. Such changes include, but are not limited
to, wiring, shielding, or grounding changes to any light, strobe, beacon, or other electrical
device located in the vicinity of the GMU 44 unit. Likewise, this test should also be
repeated to verify all subsequent changes to materials within 10.0 feet of the GMU 44.
Such changes include but are not limited to: addition, removal, or modification of ferrous
or electrically conductive materials located in the same wing as a GMU 44 unit. This
procedure validates that no electronic device is interfering with the operation of the
GMU 44 magnetometer which directly impacts the determination of attitude and heading
by the GSU 73 AHRS. Calibration Procedures A and B are not required prior to this
execution of this procedure.
The real time readout displayed during the interference test is only valid for the location
of the GMU when the test was initiated. If using this procedure to evaluate multiple
mounting locations, the test must be started over for each location, failure to do so could
provide incorrect test results.
Garmin recommends this test be performed at least once every 12 months.
1. Enter configuration mode by holding down the left-hand softkey while powering on the
GDU 37X (if needed).
2. Use the FMS Joystick to select the GSU Page (if needed).
3. Unlock GSU Page by pressing softkeys 2, 3, 4 in order (if needed).
4. Ensure that all the required status boxes are checked (Tables 9-2 and 9-3).
G3X Installation Manual – Post Installation Checkout and Calibration Procedures
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Revision E