Garmin 225B Manuale Utente

3-13

190-01182-00  Rev. A

Garmin GTR 225/225A/225B Pilot’s Guide

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. 

 

2.   Turn the SMALL knob to set the value. Then, press the ENT 

key.