190-01115-01 G3X/G3X Touch Install Manual - GDU 4XX Config and Post Install Checkout
Rev. AC Page 34-21
34.4.6 Magnetometer Calibration Page
After mechanical and electrical installation of the GMU Magnetometer(s) have been completed, prior to
operation, a set of post-installation calibration procedures must be carried out on the Magnetometer
Calibration page.
The calibration procedures (34.4.6.1
– 34.4.6.3) may require that certain status boxes on the Magnetometer
Calibration Page (configuration mode) indicate a positive state (green check marks) before starting the
procedure. Table 34-2 and Table 34-3
list the status box requirements for each calibration procedure.
Table 34-4 describes the Magnetometer calibration procedures.
Table 34-4 Post Install Cal Procedure Summary for Magnetometer Calibration Page
Procedure Name
Procedure
Description
Installations Requiring Procedure
Unit Orientation
Configure
magnetometer
installation
orientation
Required for all GMU 11 installations
Magnetic
Interference Test
Validate no
magnetic
interference with
GMU
magnetometer
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 magnetometer. Such changes include, but are not
limited to, wiring, shielding or grounding changes to any light,
strobe, beacon or other electrical device located near or in the
same wing as the GMU magnetometer. Likewise, this test
should also be repeated to verify all subsequent changes to
materials within 10.0 feet of the GMU magnetometer. Such
changes include, but are not limited to, addition, removal or
modification of ferrous or electrically conductive materials
located near or in the same wing as the GMU magnetometer
unit.
Garmin recommends this test be performed at least once every
12 months.
Magnetometer
Calibration
Compass Rose
Taxi Maneuver
Required for all installations.
This calibration must be performed after every Pitch/Roll Offset
Compensation and following a removal or replacement of the
GMU unit, or degaussing of the area near the GMU location.
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