Simrad NSO, Operation Manual

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Using echosounder | 49
The scroll speed
You can select the scrolling speed of the echosounder image on the screen. A high scroll
speed will update the image fast, while a low scroll speed will present a longer history.
Zooming
You can use the
IN / OUT
keys to select zooming level on the
Echosounder image.
Zoom level is shown on the upper left side of the echosounder panel.
When zooming in, the sea floor will be kept near to bottom of the
screen, irrespective of whether it is in auto range or manual range.
If the range is set considerably less than the actual depth, the unit will not be able to
find the bottom when zooming.
If the cursor is active, the unit will zoom in where the cursor is pointed.
Adjusting color and gain settings
Gain
The gain controls the sensitivity of the
echosounder.
The more you increase the gain, the
more details will be shown on the
image. However, a higher gain setting
may introduce more background clutter
on the image. Conversely, if the gain
is set too low weak echoes may not be
displayed.
Auto gain
The Auto gain option will keep 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. This is indicated as A-40
- A40.
Color
Strong and weak echo 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 will be displayed in the color
at the strong return end of the scale.
Adjusting the Gain and Color gain settings
Gain and Color are adjustable by using the rotary knob.
You select between Gain and Color by pressing the rotary knob. The active control will
expand and display it’s name in full. You can then adjust the value by turning the knob.
If you press and hold the rotary knob when Gain is selected, you switch between Auto
and Manual gain option.
IN OUT