Instruction manual

Display presentations
• Use this parameter to control the thickness (in pixels)
of the marker line(s).
8 For every marker line, set
Show to On.
9 If you wish to see the marker lines in the expanded views
(bottom expansion, zoom and phased range), set
Sensor
marker in expansion
to On.
10 If you wish the PI system to draw a thin white line over and
under the marker lines, sett
Marker white zone to On.
11 If you wish to see the height marker only in expanded views,
set
Height marker in main echogram to Off..
12 Select requested
Height reference.
• The height sensor measures the distance from the
headrope to the bottom. If you use the echo sounder in t he
PI system, set
Height reference to Bottom, and the height
marker will follow the bottom contour. With correct time
delay you will then see the trawl in “true motion”.
• If you can not use the PI echo sounder, set
Height reference
to Surface. The height is now shown using 0 m depth as
reference. The distance from the 0 meter line and down
to the marker line is then the current height of the gear.
13 Press the
ENT button to save the chosen parameters and
return to the graphical presentation.
Spread marker line
1 Identify the sensor you wish to use, and make sure that
the sensor is connected to the PI system with correct
communication channels and update rates.
2 Ensure that you have a graphical presentation active on your
PI system.
3 Press the
ADJ button to open the Graphic setup menu.
4 Press the
GAIN+ button repeatedly to reach the Marker line
dialogue.
5 Observe the list of sensors that appear. Only those sensors
that can provide a marker line are listed.
6 Locate the Spread sensor, and set
Show to On.
7 Enter the preferred settings for
Marker line thickness and
Marker line delay.
8 Press the
ENT button to save the chosen parameters and
return to the graphical presentation.
The Spread marker line is presented on the graphic display
with a continuous line. The c olour of the line is the same as
the background colour in the numeric presentation. To read the
distance between the trawl doors, consult the depth range on the
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