Simrad AP28 Operator's Manual page 60

The profiles are Day profile and Night profile. The
profiles can be optimized for readability under different
light conditions, and you can quickly switch between the
two using the PWR key and the softkeys. Refer to
Backlighting, page 15.
Display contrast
The contrast controls the difference between the
text/graphics and the display background. Level 9 gives
the highest contrast.
Range Change per step Default
0 - 9 1 4
Day and night profiles
The day and night settings controls the display
background, the light color and light level for the display
and the keys.
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