Using The Brightness Key; Using The In And Out Keys - NorthStar 957 Operator's Manual

Chapter 3 - Using the Controls

Using the BRIGHTNESS key

Using the IN and OUT keys

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To get the best picture for the current conditions, the 957's
screen may require minor adjusting for different viewing
angles, temperature conditions, etc. Press the BRIGHTNESS
key (the unlabelled double arrow) to adjust the screen's
brightness.
On the CHART and the 3D STEER screen, each press of the IN
key zooms in to double the scale, and each press of the OUT
key zooms out to halve the scale.
On non-CHART screens, you can also use the IN key and OUT
keys to adjust the transparency of the video image, if already
displayed: Pressing IN lets you see more of the video image,
and pressing OUT lets you see more of the screen underneath
the image.
957 Operator's Manual, Rev. B