Kongsberg EK80 Reference Manual page 600

Functions and dialog boxes
Description
Different species often occupy different depth layers. Such layers may be defined by salinity
or temperature, or simply by ambient light or the availability of food. In order to study these
species, the EK80 supports a Layer function. By means of this function, you can create your
own depth layers in the water column to improve the dynamic data required for analysis.
Layers are used to calculate various values from the echo data collected within a specific
depth range in the water column.
By default, a background layer collects all the data from the range chosen on the
Main
menu. Unless you specify your own layer(s), all data presented by the various information
panes are calculated from this background layer. However, with a large range selected - as in
the background layer - the data will not be very accurate.
Once you create your own layer, all calculated values from this layer are displayed
in the Numerical information pane. When the layer is selected ("activated") in the
Numerical information pane (layer data shown with red text) or in the echogram, all data
shown by the relevant information panes are calculated from the echo data within the
selected layer.
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