B&G Vulcan Series, Operator'S Manual, Page: 116 / 198

setting may introduce more background clutter on the image. If the
gain is set too low, weak echoes might not be displayed.
Auto gain
The Auto gain option keeps the sensitivity at a level that works well
under most conditions. With the gain in auto mode, you can set a
positive or negative offset that gets applied to the auto gain.
Color
Strong and weak signals have different colors to indicate the
different signal strengths. The colors used depend on which palette
you select. The more you increase the Color setting, the more
echoes are displayed in the color at the strong return end of the
scale.
DownScan options
Provides options for specifying the DownScan image. This menu
option is available when Overlay downscan is selected in Echo
settings dialog. For more information see
"Echosounder settings" on page
122.
Pausing the image
You can pause the image, allowing you to examine it.
This function is useful when you need to position a waypoint
exactly on the image, and if you are using the cursor to measure a
distance between 2 elements on the image.
The pause function stops the Echosounder from pinging the
transducer. The system is not collecting Echosounder data when
paused in this manner.
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Echosounder | Vulcan Series Operator Manual