Simrad ES70 - DOWNLOAD AND INSTALLATION REV B, Operator'S Manual

Page: 29 / 128

Getting started
f In order to restore the weakest colours, click on the left edge of the current
colour scale, and drag towards left.
3 Click the
Display
icon under the
Main
menu to open the
Display
menu.
→ Display menu on page 105
4 On the
Display
menu, click
Colour Setup
to open the
Colour Setup
dialog.
This dialog is used to define which colour scale to use on the ES70 presentations.
You can test the options by making a selection, and clicking
Apply
. The resulting
colour scale is immediately shown in the
Colour Scale
information pane.
When the colour scale uses 12 colours, each colour always represents a 3 dB value
range. Using 12 colours thus enables mapping of a 36 dB value range to colours.
5 Click
OK
to save the current settings and close the dialog.
How to check the size distribution and fish position settings
This procedure explains how to verify the current parameters for size distribution and
fish size settings.
Note
Size distribution and fish position information panes are only available if you use a
split beam echo sounder system!
1 Click the
Size Distribution
icon on the
Title Bar
to open the
Size Distribution
information pane.
The
Size Distribution
information pane shows a histogram of
the single fish echoes detected. The calculation is based on the
parameters you have selected in the
Calculation Interval
dialog; time,
ping or a chosen part of the current view. It thus provides a visual
indication on how large the fishes are within the chosen interval.
Only the fishes detected by the current transducer frequency are shown.
The large number above the histogram shows the average size of all the fishes in the
histogram. The value is presented in the unit you have chosen in the
Units
dialog.
For an accurate x-axis value, place the cursor on a vertical bar in the histogram, and
read the value from the label.
The abbreviation TS is commonly used. It means “Target Strength”, and this is a
measure of how strong echo the individual fishes in the current echogram generate.
The echo strength indicates the size of the fishes. The
Size Distribution
information
pane thus provides a mathematical estimate of the sizes of all the chosen fish species
in the echogram.
343539/B
27