Magnetometer Calibration; Aircraft Alignment - Garmin G3X Touch Installation Manual

33.4.4.3 Magnetometer Calibration

NOTE
The ADAHRS Unit Orientation
(Section 33.4.3.2), and the GMU 11 Unit Orientation
be successfully completed prior to performing the Magnetometer Calibration.
NOTE
The Magnetometer Calibration must be carried out at a location that is determined to be
free of magnetic disturbances, such as a compass rose. Attempting to carry out this
maneuver on a typical ramp area will not yield a successful calibration. The accuracy of
the ADAHRS cannot be guaranteed if this calibration is not performed at a magnetically
clean location.
Taxi the aircraft to a site that has been determined to be free of magnetic disturbances. Ensure that there
are no nearby magnetic materials on or near the perimeter of the site. If unavoidable, maneuver the aircraft
to keep the magnetometer from passing within twenty feet (6.1 meters) of such objects. Additionally
ensure that vehicles or other aircraft are an adequate distance [forty feet (12.2 meters)] away from the
aircraft under test.
At the site, align the aircraft to a heading of magnetic north (5°). It is best to offset the aircraft position to
the left (west) of the North/South axis to allow turning clockwise around the site as indicated in
Figure 33-3.
190-01115-01 G3X/G3X Touch Installation Manual - GDU 37X Config and Post Install Checkout
Rev. AC
(Section 33.4.3.1), the Pitch/Roll Offset Compensation
Figure 33-3 Aircraft Alignment
(Section 33.4.4.1, if applicable) must
Page 33-33