Surface Echogram Description - Simrad ES80 Reference Manual

User interface

Surface echogram description

A Surface echogram is mainly used when you wish to look at the entire water column
starting from the sea surface and down to the bottom. Since this echogram is referenced
to the sea surface, the bottom contour will vary with the actual depth. You can select
the start range (the depth from which the echogram starts) and the vertical range (the
vertical "length" of the echogram) by means of the and settings. Both
Start Range Range
the and the functions are located on the menu.
Range Start Range Main
How to open
To activate Surface echogram, click in the chosen
view to make it "active". Select on the
Echogram Active
menu. Select the tab to open the page. On the page, set
Echogram Echogram Echogram
to Surface.
type
Description
The Surface echogram is often used to study the water column from a few meters under
the hull and down to the bottom. If you set up the and depths to place
Start Range Range
the bottom contour at the lower end of the echogram, you will have good opportunity to
study the echoes from the water column. Since this echogram is referenced to the sea
surface, the bottom contour will vary with the actual depth.
The biomass is automatically calculated based on choices you make in the
Calculation
dialog box; within a given time frame, a defined number of pings, or a portion of
Interval
the echogram view. The data is then taken from an echo area starting immediately after
the transmit pulse, and ending just over the detected depth.
If you have limited your vertical range (using the and settings), the
Start Range Range
resulting area is used for the biomass calculation. If the seabed is clearly defined with
a unique bottom detection, the bottom echo will not be included in the calculations.
Therefore, if you switch the bottom detector off, the bottom echo will be included in
the calculation.
Tip
For closer investigation, you can use the Zoom information pane to enlarge
echoes from the water column or the bottom.
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