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Functions
3.5.3 Display Brightness
From the factory, the GNC 255 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 GNC 255 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.
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.
3.5.4 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.
1.
Press FUNC.
2.
Turn the outer knob to SYS CONFIGURATION.
3.
Turn the inner knob to DSPL CONTRAST.
4.
Press ENT.
5.
Turn the inner knob to set the offset value.
6.
Press ENT to save selected value.
Press CLR to cancel the change.
3-18
Display Brightness Page
Display Contrast Page
Garmin GNC 255A/255B Pilot's Guide
Current Display Brightness
Offset Value
Offset Value
190-01182-01 Rev. E
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