Garmin G3X Installation Manual page 167

If, upon completion of the Magnetometer Calibration Procedure in both the clockwise and counter-
clockwise directions, the PFD displays the "CALIBRATION SUCCESSFUL / SITE IS CLEAN"
message, then the candidate site is sufficiently free of magnetic disturbances and is acceptable for
performing the Magnetometer Calibration Procedure. It is important to perform the procedure in both the
clockwise and counter-clockwise directions to ensure that the magnetometer sweeps over a large enough
area at the candidate site.
If, upon completion of the Magnetometer Calibration Procedure in either of the two directions, the PFD
displays either the "MAG FIELD AT SITE NOT UNIFORM", or "MAG FIELD AT SITE DIFFERS
FROM IGRF MODEL" message, then the site contains magnetic disturbances that are too large.
The Magnetometer Calibration Procedure must consistently report "CALIBRATION
SUCCESSFUL / SITE IS CLEAN" in both the clockwise and counter-clockwise
directions for the site to be considered acceptable. More than one failure out of ten
attempts in a given direction would be sufficient reason to conclude the site is not
acceptable.
A site that is used repeatedly to perform the Magnetometer Calibration Procedure should be re-evaluated
every 12 months, and after any significant construction or placement of magnetic objects (above or below
ground) within 50 meters of the location.
G3X Installation Manual – Post Installation Checkout and Calibration Procedures
190-01115-01
NOTE
Page 9-27
Revision E