Kongsberg Simrad SN90 Reference Manual page 631

40 log R
This setting offers larger amplification closer to the bottom. It is commonly used to
provide the best echoes from single fish.
Other options are provided when this function us used in an Inspection view. The
echo presentation in the Inspection view resembles the echogram you see on an echo
sounder. The Inspection view can be regarded as an "echo sounder" with an adjustable
direction. In the SN90 system we use the phrase echogram to describe the information
provided by the view.
No TVG
TVG compensation is not implemented. This option is hardly ever used.
School
This setting offers weaker amplification close to the bottom. It has been designed
to provide the best echoes for schools. The physical size of a school allows you to
detect it even with reduced gain.
Fish
This setting offers larger amplification closer to the bottom. It has been designed to
provide the best echoes from single fish.
User
This setting allows you to define your own TVG curve. To choose your own TVG
curve, use the dedicated function in the
Related topics
Concept descriptions, page 625
Important settings, page 626
TVG function, page 464
381294/E
dialog box.
Echogram
Concept descriptions
629