NorthStar 957 Operator's Manual page 142

Chapter 10 - Using Special Functions
Turning the video
image on and off
Adjusting the
video's
transparency
Page 134
will temporarily disappear until you acknowledge the
question.
To see the video image, press the VIDEO key. To turn it off,
press VIDEO again. If you're displaying the optional ECHO
SOUNDER screen, first press MORE, then press VIDEO.
If the video source isn't connected or isn't working properly, color bars will
be shown instead of a video image
To adjust the video's transparency, press the IN and OUT keys.
Pressing OUT lets you "see through" more of the video to the
screen underneath; pressing IN will make the video more
opaque. (If you're displaying the CHART screen or 3D STEER
screen, the IN and OUT keys are reserved for zooming. You
must display a different screen, press IN or OUT, then return to
those screens.)
NOTE:
957 Operator's Manual, Rev. B