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 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.
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 "settings" on
page 82.
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, boat wakes and temperature inversions 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
a low value.
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.
78
Echosounder | NSS evo2 Operator Manual
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