Operation Manual

Operational procedures

850-165186 / Rev.B

• Trawl opening mode: T his parameter decides how the trawl

opening shall be recreated on the graphic presentation. If you

have sufficient sensors on the trawl you must select Auto,

and the the PI54 will automatically calculate the trawl

opening and draw it accordingly. If you only have one sensor

on the trawl opening (Depth or Height sensor on the

headrope), the Manual setting will add an artificial line on

the presentation. The distance from the headrope to the

footrope must then be defined manually using the Manual

trawl marker parameter.

Access to the parameters

1 Make sure that a graphic presentation is active.

2 Press the ADJ button to open the Graphic setup

dialogue.

3 Press the GAIN+ button to access the Trawl info setup

page.

Set up the parameters

1 Locate the setting Headrope sensor, and choose the

sensor that you have placed on the headrope.

- If you have no Depth or Height sensors on the

headrope, leave the setting to None.

2 Locate the setting Footrope sensor, and chose the sensor

that you have placed on the footrope.

- If you have no Depth or Height sensors on the

footrope, leave the setting to None.

3 Observe that the setting for Trawl opening mode is

automatically set to Auto or Manual.

- If you have sensors placed on both the footrope and the

headrope, the PI54 will be able to calculate the trawl

opening automatically, and the mode is set to Auto.

- If you have only one sensor, you will need to enter a

manual trawl marker.

4 If you have only one sensor, enter a value for Manual

trawl marker.

- This value must represent the actual height of your

trawl opening, based on your knowledge about your

gear. The information will be used by the PI54 to draw

a second trawl marker line.