Simrad ES80 Reference Manual page 428

Simrad ES80 Reference Manual
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Fish (40 log R)
This gain setting provides larger amplification closer to the bottom. It has been
designed to provide the best echoes from single fish.
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Targets (40 log R)
This setting uses the same TVG amplification as
filtering and compensation is implemented.
Only echoes detected and interpreted as single fish are shown. The echoes are
compensated for their physical position in the beam (beam compensation).
This means that fish in the outer region of the beam are adjusted to correct size
even though their echoes are weaker.
Note
This TVG setting only works with split beam transducers.
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Target Mix (40 log R)
This setting uses the same TVG amplification as
beam compensation is implemented. Echoes detected and interpreted as single
fish are adjusted to their correct size according to their physical position in
the beam.
Note
This TVG setting only works with split beam transducers.
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User
This setting allows you to define your own TVG setting. To choose your own
TVG curve, use the dedicated function in the
Echogram Type
Use this function to select what kind of echogram you wish to see in the current
("active") view.
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Surface
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. If you set up the
contour at the lower end of the echogram, you will have good opportunity to
study the echoes from the water column.
In the surface echogram, all calculations are made from the sea surface and
down to the detected bottom. Use this echogram type to obtain correct
calculation of the biomass. It will also provide valid data for the Size
Distribution information pane.
426
Fish (40 log R)
Fish (40 log R)
Echogram
and
Start Range Range
, but additional
, but additional
dialog box.
depths to place the bottom
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