Display Brightness Control; Automatic Brightness Control; Manual Brightness Control - Garmin GPS 175 Pilot's Manual

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2.20 Display Brightness Control

Depending on configuration, display brightness is controlled using
inputs from the built in photocell, aircraft dimmer bus, or both.
2.20.1

Automatic Brightness Control

Dimming is limited to prevent on screen indications from becoming unreadable. The
built in photocell automatically controls display brightness based on ambient light
levels.
Backlight
Intensity Level
Decrease
Backlight
2.20.2

Manual Brightness Control

Optionally, the unit is configurable to use an aircraft dimming bus for display
brightness control. Upon reaching minimum input level, display brightness reverts to
the photocell. This prevents the display from going black in the event of a dimmer
input failure.
Installer configured curves determine the amount of change in brightness that
occurs in response to a control adjustment.
If brightness control is not satisfactory, contact a Garmin dealer to adjust the
lighting curves.
2-30
Manual Offset
Indicator
Increase
Backlight
GPS 175/GNX 375 Pilot's Guide
During automatic control, the pilot
may still adjust brightness using
the manual offset controls in the
Backlight page.
The unit retains manual offset
settings over power cycles.
190-02207-02 Rev. 1