G5 Heading; Backlight Intensity - Garmin G5 Pilot's Manual

System Overview

1.4.3 G5 HEADING

Magnetic heading is available in a standalone installation with a magnetometer,
and when the G5 is configured as a backup in a G3X/G3X Touch system and the G5
is receiving magnetic heading data from an ADAHRS unit. If magnetic heading input
data is not available, the G5 will display GPS-derived ground track instead.
The G5 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 software
update. Failure to update this database could lead to erroneous heading information
being displayed to the pilot.
If the G5 senses the magnetic heading measurement is valid, but possibly outside of
the internal accuracy limits, the numeric heading is displayed in yellow.
If the GAD 29B fails, VFR will be displayed in amber text and GPSS will be displayed
in amber text, if GPSS mode is selected.
Figure 1-3 GAD 29B Fail (Amber VFR)

1.4.4 BACKLIGHT INTENSITY

When set to Auto, the backlight is automatically adjusted according to ambient
light conditions. When set to Manual, the backlight level is set by the pilot.
Adjusting backlight intensity:
1) While the unit is turned on, press the Power Button.
2) Turn the Selection Knob to adjust the backlight intensity.
3) Press the Selection Knob to close the backlight page.
Setting the backlight intensity to automatic or manual:
1) While the unit is turned on, press the Power Button.
2) Press the Power Button to toggle between Auto and Manual.
3) Press the Selection Knob to close the backlight page.
4
G5 Electronic Flight Instrument Pilot's Guide for Non-Certified Aircraft
Figure 1-4 GAD 29B Fail (Amber GPSS)
190-02072-00 Rev. J