Display Brightness; Display Contrast - Garmin GTR 225 Pilot's Manual

3.4.3 Display Brightness

From the factory, the GTR 225 automatically adjusts its display brightness for
the current lighting conditions. A small sensor on the display is used for this
function. A manual adjustment is available for controlling the brightness level of
the display as an offset from the normal or zero position.
The limits of the adjustment range are: -10 (Low Display Intensity) and 100
(High Display Intensity). A value above zero means brighter than normal and
a value below zero means darker than normal. The range can be adjusted by
using the inner knob.
The GTR 225 will either control dimming based on the photocell or the lighting
bus. This is set in configuration mode during installation and is not selectable
by the pilot.
Current Display Brightness
Offset Value
Display Brightness Page
1. Press FUNC.
2. Turn the outer knob to SYS CONFIGURATION.
3. Turn the inner knob to DSPL BRT.
4. Press ENT.
5. Turn the inner knob to set the value.
6. Press ENT to save selected value.
Press CLR to cancel change.

3.4.4 Display Contrast

The display contrast has a range from -50 (low) and 50 (high) with 0 as the
default. The range can be adjusted by using the inner knob.
Offset Value
Display Contrast Page
1. Press FUNC.
2. Turn the outer knob to SYS CONFIGURATION.
3. Turn the inner knob to DSPL CONTRAST.
4. Press ENT.
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Garmin GTR 225/225A/225B Pilot's Guide