Pelagic Echogram Description - Simrad ES80 Reference Manual

User interface

Pelagic echogram description

The Pelagic echogram shows you a selected part of the water column. The echoes start
from any start depth below the sea surface, which is used as depth reference. The bottom
contour shall not be visible in the echogram. 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 the and the
Start Range Range Range Start
functions are located on the menu.
Range Main
How to open
To activate Pelagic 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 Pelagic.
type
Description
A Pelagic echogram is mainly used when you wish to look at the water column starting
from any distance below the sea surface down towards the bottom, but without seeing
the bottom contour. To do this you must set up the to the preferred upper
Start Range
depth. The depth must then be chosen to make the echogram stop somewhere
Range
over the bottom contour. This gives you good opportunity to study the echoes from
the water column.
Pelagic echograms are useful when you work in deeper waters. The reduced range and
the fact that you do not need to wait for the bottom echo means that the ES80's ping
rate is increased. The software algorithms in the ES80 are designed to work without
the bottom detection reference.
In a Pelagic echogram the calculations disregard any bottom detection. All calculations
are based on the entire echogram shown in the view. If the bottom echo is present in the
echogram, the biomass calculation will be wrong.
Tip
For closer investigation, you can use the Zoom information pane to enlarge
echoes from the water column.
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