Echo sounder theory
Example 15
Using the Bottom Backstep parameter for flatfish detection
If you fish for sole, flounder or similar species, you can use the
Bottom
Backstep
parameter to enhance the detection of the fish. Increase the bottom
backstep value (make it more positive) so that the bottom is detected slightly
deeper than the correct depth. The ES70 will then “push through” the fish
better, and the flatfish will be shown as they are located “above” the bottom.
→
How to adjust the bottom detection to find flatfish
on page 91
About range selection
For every frequency (channel) you wish to present on the echo sounder display, you are
provided with two echograms.
Figure 42
Range selection
A
B
C
D
(CD010217E)
A
Upper echogram
(surface related)
B
Lower echogram
(bottom related)
C
Scope view for upper
echogram
D
Scope view for lower
echogram
Normally, the upper
echogram will show the
entire depth range from
the sea surface and down
to the bottom, while the
lower echogram shows
a bottom expansion. This
is a magnification of the
area just above and below
the bottom.
You are free to choose
any presentation you
want in any of the
echograms.
To do this, open the
Echogram
dialog on the
Active
menu.
343539/B
117
Summary of Contents for ES70 - DOWNLOAD AND INSTALLATION REV B
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