Simrad IS20 Manual page 40

Day and night profiles
The day and night settings control the display
background, the light color and light level for the display
and the keys.
40 | Changing the default settings
Setting
Light level
Light color
Invert display
Change
Range
per step
9 – Off
White / Red
Yes / No
Default
value
1 3
White (Day)
-
Red (Night)
- No