Garmin G3X Touch Pilot's Guide

Garmin G3X Touch
™
Pilot’s Guide for Certified Aircraft
190-02472-00 Rev. D
24
System Overview
System
Overview
Flight
InstrumentsEIS
CNS
Interface
GPS
Navigation
Flight
Planning
Hazard
Avoidance
Additional
FeaturesAFCSAnnun/AlertsAppendixIndex
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 25D) 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.
Attitude/Heading Invalid
AHRS
no-GPS
Mode
AHRS Normal
Operation
AHRS no-
Mag Mode
AHRS no-Mag/
no-Air Mode
Heading Invalid
available available
unavailable
unavailable
available
unavailable unavailable
available
l
e
e
e
l
l
b
e
e
e
e
Air Data
l
e
e
e
e
l
bl
b
e
e
e
e
e
Magnetometer Data
unavailable
available
l
bl
b
e
e
e
e
e
l
e
e
e
e
GPS Data
l
bl
e
e
e
e
e
l
e
e
e
Magnetometer Data
l
e
e
e
e
u
u
Air Data
Loss of GPS, magnetometer, or air data inputs is communicated to the pilot by
message advisory alerts. Any failure of the internal AHRS inertial sensors results in loss
of attitude and heading information (indicated by red ‘X’ flags over the corresponding
flight instruments). If the G3X Touch senses the magnetic heading measurement is
valid, but possibly outside of the internal accuracy limits, the numeric heading value on
the PFD is displayed in yellow.

Garmin G3X Touch Specifications

General

Power Input	10-32 VDC
Touchscreen	Yes
Built-in GPS	Yes
AHRS	Yes
Air Data Computer	Yes
Aviation Database	Yes
Terrain Awareness	Yes
Operating Temperature	-20°C to +55°C
Display Size	10.6 inches
Display Type	LCD
Connectivity	Wi-Fi, Bluetooth, USB, RS-232, CAN bus
Engine Monitoring	Yes
Autopilot Compatibility	Yes
Traffic Awareness	Yes
Weather Data	Yes