ManualOperator

Trawl Positioning

rofile Contour

d Depth Profile Contour

wing the estimated trawl positioning in the Depth profile window distance is equal to the rope length by its tension

Trawl positioning with PACHA or GEONET

The Pro version of MaxSea Fish with the module enables you to display data provided by PACHA, Geonet or Simrad ITI, the depth acoustic positioning system for trawls.

For more information about this function, contact your reseller.

Introduction

The PACHA , Geonet or Simrad ITI system allows to determine the location, geometry and environment of a trawl in order to safely and efficiently perform trawling operations.

This system makes it possible to determine in a very precise way the site, positioning in order to improve the security and to optimize the performances of each spinning operation .

For example, thanks to the accurate measurements of the trawl location, it is possible to operate very close to the obstacles and wrecks where the catch of fish can be very much increase.

Configuration

To receive data from PACHA , Geonet or Simrad ITI transponders, the configuration required is the following :

•MaxSea Pro with 3 serial ports

•Pacha Geonet Simrad ITI module.

•1 serial port for Position ( GPS )

•Gyro

•2 serial ports for the PACHA , Geonet or Simrad ITI system.

Connection

NMEA standard.

All the data coming from the system PACHA arrive on PACHA DAP1 serial port. The configuration in

MaxSea DAP2 is there only to simulate position coming from DAP2. The DAP2 data comes in fact from

DAP1 serial port.

Input-Output configuration

1.Select [Input/Output Settings] from the [Utilities] menu. The following dialog box is opened :

2.Click the Trawl tab

3.Add the PACHA/GEONET system by clicking on "Add Instrument".

4.Select a the port com which is connected to the system

5.Click next to activate the wizard which lets you to choose between several system.

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6.Select the line PACHA / GEONET or Simrad ITI or Scanmar or Marelec.

The system is connected, select the line in the Instrument list by:

1.Either double clicking the line.

2.Or click on the Advanced settings button.

3.The data settings : trawl on port COM2 appears to configure your system.

PACHA / GEONET SYSTEM Data Settings

The following setting dialog box is according to Pacha/Geonet System.

All data provided by Pacha are coming on the PACHA DAP1 serial port.

DAP2 configuration is used to simulate in MaxSea the arrival of the DAP2 transponder.

DAP2 data positioning in fact, arrive through the DAP1 serial port.

SIMRAD ITI SYSTEM Data Settings

To change which information (position, heading and ground speed) from your instrument is feeding MaxSea:

1.Either go to the [Utilities] menu and choose [Data Input-Output Settings] or press the [F4] keyboard shortcut.

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Trawl Positioning

2.Click on "Trawl" .

3.Select the corresponding line to the COM on which the system is connected,

4.Either double click the corresponding Instrument line or click on the "Advanced settings" button to activate the "Data settings" dialog box.

Data and sentence selection

Choose the corresponding case information that you wish to acquire,

GROUND SPEED

GROUND HEADING

SURFACE SPEED

MAGNETIC HEADING

...

DEPTH

...

Choose the sentence under the pull down menu:

This dialog box allows you to :

Choose the data you wish to receive,

Assign the instrument Master if the same information is provided by several instruments, you have to select one as your master source. For example, boat position may be received by your GPS and your Loran.

To define your master instrument, select it in master column.

Related topic to get more information about NMEA sentences >> List of acquired ITI trawl sentences

Trawl Display

2D Display

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Then trawl is represented as an icon on the window card, the dials instruments show information sent by sensors.

Trawl track

By default the track of the trawl panels is activated. It is thus enough to click [ TrackOn] to show the tracking trawl on the chart. You can modify parameters or deactivate the track of the trawl in the same way as the ship track from the [Utilities] menu: [Option: GPS/rack].

Please, select in the left-hand list a positionner of your choice the panel the parameters of track of which you want to modify

Select panel and then, enter the new tracking parameters.

You can activate for example or deactivate the track of the panel by checking or not the Track on box.

(For more information about parameter settings refer you to the Ship track chapter)

Remark: it is possible to activate the trawl track by clicking on Track On/Off button without showing the track of the ship. To do it you have to deactivate the track option for the GPS in the "Track properties".window.

3D Display

Sensors position is represented in the 3D window showing immediately the trawl position compared to the bottom.

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Description:

1 – DAP1 and DAP2 follow-up (displayed only in the 3D window).

2 – 3D representation of the trawl net.

3 – DAP1 and DAP2 representation in the 3D window.

4 – Ship follow-up (displayed only in the 3D window).

5 – Ship grounding track and DAP1 / DAP2 grounding tracks which are displayed when the ship is "Track on" positioned, the tracks will be saved into the active fishing plan.

Thanks to this system, it is possible to work in full safety in dangerous trimmings, where it is known that the fish caught will be much better.

List of acquired ITI trawl sentences

Click on available link for more information:

| DBT | DBS | FSP | GLL | HFB | MTW | TDS | TFI | TPC | TPP | TPR | TPT |TS2 | TTS | VTG| WWL | WWT |

All following messages descriptions are based NMEA 183 representation, related topics for more information: "Field type" and "Character Symbol Table" .

TPR – Trawl position relative to vessel

@IITPR,x,M,x,P,x.x,M<CR><LF> a b c d e f

a, b – Horizontal range to the trawl (0-4000m) .

c, d – Bearing to the trawl relative to the vessel heading (resolution 1°). e, f – Immersion of the trawl below the surface (0-2000m).

TPT – Trawl Position true vessel

@IITPT,x,M,x,P,x.x,M<CR><LF> a b c d e f

a, b – Horizontal range to the trawl (0-4000m) .

c, d – True bearing to the trawl (i.e. relative to north). (resolution 1°) e, f – Immersion of the trawl below the surface (0-2000m).

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TPC – Trawl position in Cartesian coordinates

@IITPC,x,M,x,M,x,M<CR><LF>

a b c d e f

a, b – Horizontal distance from vessel center line. Value is positive if trawl in on starboard side, negative if on port side.

c, d – Horizontal distance from the transducer to the trawl along the vessel's center line. The value will normally be positive as the trawl is usually behind the vessel.

e, f – Immersion of the trawl below the surface (0-2000m).

Note:

GH = Vessel's Ground Heading

SH = Vessel's Surface Heading = Vessel's center line = Y axis

dX = Horizontal distance from vessel's center line.

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dY = Horizontal distance from the transducer to the trawl along the vessel's centre line dC = Horizontal distance to the trawl = √ (dX² +dY² )

β = Bearing to the trawl relative to the vessel heading = β = π – α

α = arctan (dX/dY)

DBS – Immersion of the trawl below the surface

$IIDBS,,,x.x,M,,<CR><LF> a b

a, b – Immersion of the trawl below the surface (0-2000m).

MTW – Water temperature at the trawl

$IIMTW,-x.x,C<CR><LF> a b

a, b – Water temperature in °Celcius measured at the trawl (sign prefix only if minus). (-5°C to +30°C)

HFB – Trawl headrope to footrope and bottom.

@IIHFB,x.x,M,x.x,M<CR><LF> a b c d

a, b – Distance from headrope to footrope (0-100m). c, d – Distance from headrope to bottom (0-100m).

TDS – Trawl door spread

@IITDS,x.x,M<CR><LF> a b

a, b – Spread distance in meter (0-300m).

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TS2 – Trawl spread 2

@IITS2,x.x,M<CR><LF> a b

a, b – Spread distance in meter (0-300m).

TFI – Trawl filling

@IITFI,x,x,x<CR><LF> a b c

a – Catch 1 message 1. b – Catch 2 message 1. c – Catch 3 message 1.

1) Catch message values : 0 = off; 1 = on; 2 = no answer

FSP – Fish shoal position relative to vessel

@IIFSP,x,M,x,P,x,M<CR><LF> a b c d e f

a, b – Horizontal range to fish shoal (resolution 1m).. c, d – Bearing to fish shoal relative to vessel's heading. d, e – Fish shoal's depth (resolution 1 m).

GLL – Trawl position in Latitude and Longitude

$IIGLL,llll.ll,a,yyyyy.yy,a<CR><LF>

a b c d

a, b – Latitude – N/S.

c, d – Longitude – E/W.

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DTR - Data Terminal Ready

RI - Ring Indicator

SG - Signal Ground

PG - Protecting Ground (Caution : Do not use it as the signal ground !)

Data Input/Output Settings

How to set up the peripheral devices in MaxSea

1.Select [Data Input-Output Settings] from the [Utilities] menu

2.Click the "Dredge" Tab

3.Click on "Add Instrument..." to confirm

4.Select the corresponding port (COM) where system is connected.

5.Choose "Dredge" under the "Norm" drop-down menu list.

To delete devices, click on the corresponding line in the dialog and click on "Remove instrument"

How to input Time Out

1.Click on the corresponding line in the dialog

2.Click on the Advanced Settings button

3.Enter a value to define the delay before stopping the Dredge track ( equal to 60sec by default)

Note: "Dredge" tab does not appear in Input / Output settings dialog means that Dredge function is not available in your MaxSea version. Please contact your dealer to get more information.

Related topic to learn more on : Connecting equipment

Dredge Features

The dredge transducer provides a 0 or 5 volt signal.

CTS Status

(from 0 to 5 V at time T)

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