Kongsberg Simrad ST90, Reference Manual, Page: 40 / 690

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(C)
Mode
The four buttons in the
Mode
field are dedicated for user settings or presentation
modes. To choose which function to apply open the
Operating Panel
page. Under
User Setting Buttons
, assign one predefined setting to each button on the Operating
Panel. Before you can assign custom user settings to the operating panel, a selection
of settings must be available from the
User Settings
dialog box. The
Operating Panel
page is located in the
Installation
dialog box.
User Settings
Press one of the
Mode
buttons to apply a predefined user setting. Any user
setting selected on the Operating Panel is identified in the upper left corner of
the
Horizontal view. The identifying number refers to the
User Setting
number
on the
Operating Panel
page. Click on the text to make it larger. Click one more
time to restore the original font size.
Presentation modes
All echoes offered by the ST90 system are shown in rectangular views .
Combinations of these views are organized in presentation modes . Each
presentation mode offered by the ST90 system provides a selection of views in a
predefined pattern. You must first find the presentation mode that meets your
operational requirements, then you can change the size of the individual views.
(D)
Gain
The
Gain
buttons offer separate gain controls for the horizontal and vertical views.
You can compare this gain setting with the volume control on your car radio. When
the gain is increased, the echoes will appear stronger. Weak echoes will be easier to
see. However, since you also increase the acoustic noise in the reception, the echo
presentations will also show this noise. Too much gain may therefore "distort" the
presentation.
(E)
Range
The
Range
buttons offer range control for the horizontal and vertical presentations.
The range setting defines from how "far" you want to detect echoes. In other words,
you specify the horizontal or vertical distance from the vessel to the outer edge of
the search area.
Note
Even though you can choose a large range value, that does not mean that you can
detect your targets on the same range. The range value only defines the range that
is shown in the views. Actual target detection will always depend on the operational
environment, such as water temperature, salinity, interference and layers in the water
column.
Simrad ST90 Reference Manual