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 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 is displayed in the color at the
strong return end of the scale.
Structure options
When a StructureScan source is connected to your system, you can overlay a DownScan
image on the regular echo image.
For more information see "Echosounder settings" on page 88.
Source
Select to specify the source for the image in the selected panel.
You can display two different sources simultaneously, using a split panel configuration. Menu
controls for each panel are independent.
The source can be the internal Echosounder, another MFD on the Ethernet network, or a
Echosounder module. To define sources, refer to the separate NSO evo3 Installation manual.
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Note: Using two transducers at the same frequency ranges can cause interference
between the two, and they can show up on the image as vertical lines. To avoid this, set
one transducer at one frequency range (such as Medium CHIRP) and the other
transducer at a different frequency range (such as High CHIRP) using the Frequency
menu option.
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.
Advanced options
The Advanced option is only available when the cursor is not active.
Noise rejection
Signal interference from bilge pumps, engine vibration and air bubbles can clutter the
image.
The noise rejection option filters the signal interference and reduces the on-screen clutter.
TVG
Wave action and boat wakes can cause onscreen clutter near the surface. The TVG (Time
Variable Gain) option reduces surface clutter by decreasing the sensitivity of the receiver near
the surface.
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Note: For optimal image return and clarity in most conditions, the default value is set to
3, the maximum (range is 0-3).
Scroll speed
You can select the scrolling speed of the image on the screen. A high scroll speed updates
the image fast, while a low scroll speed presents a longer history.
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Note: In certain conditions it may be necessary to adjust the scroll speed to get a more
useful image. Such as adjusting the image to a faster speed when vertically fishing
without moving.
Echosounder | NSO evo3 Operator Manual
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