Kongsberg Simrad SU90 Operator's Manual page 226

Simrad SU90 Operator Manual
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Noise Filter
The removes unwanted acoustic noise from the display presentation. It
Noise Filter
reduces the interference from other acoustic systems (sonars and echo sounders),
as well as the noise from the propellers.
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Horizontal Scroll
The
Horizontal Scroll
from right towards left in the Echogram and Inspection views. The speed is controlled
by adjusting the number of pixels used to present each ping. A higher speed will
update the view faster, but will also reduce the resolution.
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Vertical Reference
The function is only available in the Vertical view, as well as the vertical Navigation
view.
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function controls how fast the echo presentation shall move
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