B&G Vulcan, Руководство оператора

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the bottom. Auto is the preferred setting for most fish finding sonar
use.
Preset range levels
Allows for the selection of a specific depth range that is not tied to
the depth of the water.
Custom range
This option allows you to manually set both upper and lower range
limits.
Ú
Note:
Setting a custom range puts the sonar in manual
mode. If the bottom is well beyond the lower range set,
you may lose digital depth.
Echosounder frequency
The Vulcan unit supports several transducer frequencies. Available
frequencies depend on the transducer model that is connected.
You can view two frequencies at the same time by selecting dual
Echosounder panels from the
Home
page.
Log sonar
Select to start and stop recording of Echosounder data. For more
information, refer to
"Recording log data"
on page 83.
Gain
The gain controls the sensitivity of the Echosounder. The more you
increase the gain, the more details are shown on the image.
However, a higher gain 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 Echosounder 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,
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Echosounder | Vulcan Operator Manual