Simrad ES80 Reference Manual page 117

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.
•
Target Mix (40 log R)
This setting uses the same TVG amplification as
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.
•
User
This setting allows you to define your own TVG setting. To choose your own TVG
curve, use the dedicated function in the
Note
The setting you choose will only be valid for the currently "active" echogram. The
"active" echogram view is identified with a thicker border. Normally, you must first click
in the chosen echogram to "activate" it, and then choose the setting you wish to use.
Procedure
1 Click in the echogram view you wish to change.
This will make the view "active". The "active" echogram view is identified with
a thicker border.
2 Open the
Active
3 Select
Echogram
Observe that the
4 On the left side of the
5 Choose your requested setting for TVG (Time Variable Gain).
6 Apply the change you have made.
a Select
Apply
echogram view.
b Select
Apply to All
of the same type.
406273/C
menu.
.
dialog box opens.
Echogram
dialog box, select
Echogram
if you wish to apply the chosen setting only to the currently active
if you wish to use the chosen setting on all the echograms
Fish (40 log R)
dialog box.
Echogram
Echogram
Operating procedures
, but additional beam
to open the page.
115