Ahrs Operation - Garmin G3X Touch Pilot's Manual

G Meter
Lateral Deviation Toggles lateral deviation indicator.
Synthetic Vision Overlays 3D-rendered terrain on full-screen attitude presentation.
Flt. Path Marker Overlays a marker
Pathways
Traffic
G3X TOUCH SYSTEM ANNUNCIATIONS
When an LRU or an LRU function fails, a large red 'X' is typically displayed over the
instrument(s) or data experiencing the failure. Upon G3X Touch power-up, certain
instruments remain invalid as equipment begins to initialize. All instruments should be
operational within one minute of power-up. If any instrument remains flagged, and
it is not likely an installation related problem, the G3X Touch should be serviced by a
Garmin-authorized repair facility.

AHRS OPERATION

The Attitude and Heading Reference System (AHRS) performs attitude, heading,
and vertical acceleration calculations for the G3X Touch System, utilizing GPS,
magnetometer, and air data, in addition to information from its internal sensors.
Attitude and heading information are updated on the PFD while the AHRS receives
appropriate combinations of information from the external sensor inputs.
The AHRS (GSU 25) corrects for shifts and variations in the Earth's magnetic field by
applying the Magnetic Field Variation Database. The Magnetic Field Variation Database
is derived from the International Geomagnetic Reference Field (IGRF). The IGRF is a
mathematical model that describes the Earth's main magnetic field and its annual rate
of change. The database is updated approximately every 5 years via a GDU software
update. Failure to update this database could lead to erroneous heading information
being displayed to the pilot.
190-01754-00 Rev. L
Off Disables G Meter.
G Meter appears in place of HSI when G3X Touch
Auto Display
detects G load above +2.1G or below -0.5G.
On (Replace HSI) G Meter replaces HSI.
aircraft bearing relative to heading, as affected by winds.
Overlays 3D magenta flight path boxes on full-screen attitude
presentation, indicating path to next waypoint.
Overlays indications of specific aircraft on full-screen attitude
presentation.
More PFD Options
Garmin G3X Touch Pilot's Guide
on full-screen attitude presentation indicating
System Overview
25