Operation Manual

Operational procedures
89
850-165186 / Rev.B
How to use visual aids and filters
When you use t he echo sounder, several visual aids and filters
are available to make the echoes easier to read and interpret.
Ping to ping filter
This function employs a filter which compares the echo
information from one ping with the information from the
previous ping. This will “clean up” the echogram by removing
random noise spikes and interference with no correlation with
the previous echo. The function will thus make the echoes
appear more stable. You can switch this filter on or off.
1 Make sure that your echo sounder presentation is active.
2 Press the ADJ button to open setup dialogue.
3 Locate the Ping to ping filter parameter. Set it to ON.
Colour threshold
This function allows you to choose the number of colours to use
for echogram presentation. By switching this filter on and
selecting a colour in the box, all echo colours “below” the
chosen colour will not be shown in the echogram. You can thus
regard this as an “echo threshold” which will remove the
weakest echoes.
1 Make sure that your echo sounder presentation is active.
2 Press the ADJ button to open setup page
3 Locate the Colour th reshold parameter. Set it to ON.
4 Select preferred colour in the box.
Signal threshold
This is an on/off f unction. When activated, i t will remove the
weakest echoes from the screen. The threshold level is
automatic. Activate with caution, as it may remove small fish or
other weak unidentified echoes from the presentation.
1 Make sure that your echo sounder presentation is active.
2 Press the ADJ button to open setup page
3 Locate the Signal threshold parameter. Set it to ON.
Depth grid
When this function is enabled, thin horisontal depth lines will be
added to the echogram to easier identify the depth intervals.
1 Make sure that your echo sounder presentation is active.
2 Press the ADJ button to open setup page
3 Locate the Depth grid parameter. Set it to ON.