Simrad ES70 - REFERENCE MANUAL REV A Reference Manual page 28

Simrad ES70
• : The echogram is related to the sea surface. Start depth (upper echogram
Surface
boundary) and vertical range (across echogram) are manually selected by the
and
Start Depth
→ Start Range on page 114
→ Range on page 113
• : The echogram is related to the detected bottom. Stop depth (lower
Bottom
echogram boundary) and vertical range are manually selected by the
and buttons on the
Range
having a successful bottom detection.
• : This echogram is nearly identical to the
Pelagic
the biomass calculations are not restricted by the bottom detection. This means
that the bottom echo will be included in calculations if it appears within the
chosen range.
Example: If you are investigating a large school of pelagic fish, set the
and
Range Range
echogram may mistake it for bottom, and the biomass readings will be wrong.
The echogram will however disregard the bottom detection, and give a
Pelagic
correct estimate of the biomass.
• : Trawl sensor systems communicate headrope depth and
Trawl
headrope-to-footrope distance to the ES70 at regular intervals. The echogram
covers the vertical opening of the trawl including a small margin at each side.
The headrope and footrope margins are identical. The biomass calculations are
not restricted by the bottom detection.
Their size is selected in the
be manually set in the
trawl opening, or when the measured headrope-to-footrope distance is unreliable.
The echogram is only drawn when trawl position information is available.
→ Trawl on page 145
3 Move the cursor over the echogram.
Observe that a rectangular "tooltip" label is shown. It provides information about
the echoes at the cursor's present position. Which information to include in the label
is defined in the
→ Display Options on page 130
4 Click the
Horizontal
Click the
5
Vertical
6 Click on one of the echograms.
Observe that the echogram then appears with a thick border line. The echogram you
have selected is now the "active" echogram. Any changes made in the
dialog will by default only apply to this echogram.
→ Echograms on page 44
7 On the menu, click
Active
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buttons on the
Range
menu. The echogram is only drawn for pings
Main
to enclose the school. If the school is large enough, a Surface
dialog. The headrope-to-footrope distance can
Trawl
dialog for trawl sensor systems not measuring the
Trawl
dialog.
Display Options
tab. Observe that the echogram channels are shown horizontally.
tab. Observe that the echogram channels are shown vertically.
.
Echogram
menu.
Main
echogram. However,
Surface
Start Depth
Start
Echogram
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