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3-13190-01182-00 Rev. A
Garmin GTR 225/225A/225B Pilot’s Guide
3.4.2 Display Brightness
As it arrives 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 SMALL knob to adjust the value.
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.
1. Press FUNC to access the Functions. Turn the LARGE knob
to select the SYS Function. Turn the SMALL knob to view the
Display Brightness function. Then, press the ENT key.
Press ENT to Accept
the Selected Value
Turn the SMALL Knob to
Select the Offset Value
Press CLR to Return
to the Previous Value
Current Display
Brightness
Figure 3-22 Set Display Brightness
2. Turn the SMALL knob to set the value. Then, press the ENT
key.