StartpageApplicationDisplay modesSpecificationsWireless sensorsCurrent software vers.End user documentation

The Simrad FS70 is a third wire trawl sonar for efficient monitoring of the net opening and the fishing conditions.

Simrad’s new trawl sonar platform combines “the best of two worlds”. It communicates with the vessel by means of a third wire system, and with wireless sensors mounted on the trawl by means of hydroacoustic links.

The new Simrad FS70 trawl sonar provides the “full picture”. It uses the well proven and reliable FS third wire system to establish communication between the submerged sonar head located behind the headrope and the vessel. Simultanously, the submerged unit communicates with a number of PI or FA sensors by means of hydroacoustic links. The unit even includes a 200 kHz echo sounder.

The visual presentation provided to you on the bridge gives you a clear picture of the trawl opening, as well as information from the sensors. This sophisticated solution allows you full control of any type of fishery, and by means of the information you will be able to increase the quality of the catch and your efficiency at sea.


With the Simrad FS70 the rugged FS70 Trawl Unit is placed behind the headrope. The Trawl Unit contains the Sonar Head, a 200 kHz echo sounder, and the communication circuitry required to receive data from the wireless sensors.

Other wireless sensors are then placed on the trawl to suit your requirements. These report their data to the Trawl Unit, or to a PI system on the bridge.


Simrad FS70 application

  1. Trawl Unit
  2. The area covered by the trawl sonar
  3. The area covered by the echo sounder
  4. Maximum four PI Catch sensors
  5. PI Temperature sensor
  6. PI Bottom Contact sensor
  7. PI Spread sensor

Display modes

The Simrad FS70 provides you with a clear sonar picture, a high resolution echogram, and easy operation.

Full screen display

  1. Echo sounder view
  2. Dialogue for PI sensor status
  3. Operation menu
  4. Cursor information
  5. Sonar echoes
  6. System parameters

Echo sounder display

  1. Operation menu
  2. Headrope echo sounder view
  3. System parameters

Key technical specifications

Simrad is engaged in continuous development of its products and reserves the right to alter specifications without prior notice.

Processing Unit

  • Operating systems:
    • Computer: Microsoft Windows XP
    • Sonar: Winson
  • Computer features:
    • 40 Gb hard disk
    • RS-232 Interface
    • USB Interface
    • Dual display board
    • Sound board
    • Network interface (LAN)
  • Power requirements: 115 or 230 Vac
  • Physical dimensions: 40 x 33 x 10 cm

Sonar Head

  • Sonar head types:
    • Vertical sonar
    • Echo sounder
  • Operating frequencies:
    • Sonar: 120 kHz or 330 kHz
    • Sounder: 200 kHz
  • Sonar beamwidths:
    • 120 khz: 5 x 40°
    • 330 Khz: 1.9 x 20°
  • Echo sounder beamwidth: 10 x 20°
  • Depth rating 2000 meters
  • Sensor interfaces:
    • Temperature
    • Depth
    • Catch
  • Transmit power: Selectable, max. 1kW
  • Transmit pulse length: Selectable
  • TVG setting: Selectable, and 20, 30, 40 and user log
  • Interface format: NMEA

Power/TTM Unit

  • Power requirements: 115 or 230 Vac
  • Physical dimensions: 43 x 41 x 21 cm

Trawl Unit

  • Material: Polyurethane with SS fasteners
  • Physical dimensions: 79 x 43 x 27 cm
  • Weight in air (complete): 28 kg

Wireless sensors

The Simrad FS70 Trawl sonar system will communicate Simrad’s latest range of PI sensors. However, if you still use the successful FA Catch sensor, it will communicate with those too.

40 kHz FS70 System

The 40 kHz Simrad FS70 system will communicate with the latest range of Simrad’s PI Catch sensors. It will also communicate with the other PI sensors operating on the same frequency.

PI Catch sensor

Current sensor support

With the current software and hardware functionality provided, the 40 kHz FS70 Trawl Unit can communicate with maximum six sensors (PI or FA).

Upgrading the FS70

If you have a lot of FA sensors, you may not wish to throw these over board. You can then purchase a 70 kHz FS70 system, and use your trusted FA sensors until they simply break apart (which may take a while..!). If necessary, you can add PI Catch sensors.

If you later wish to use the other PI sensors, you can upgrade your FS70 from a 70 kHz to a 40 kHz system. It is then an easy task to re-program any PI Catch sensors you may have. Once upgraded, you can add other PI sensors to monitor your trawl, such as the PI Spread, PI Temperature or PI Rip.

Simrad PI50 is the perfect backup system!

By installing a Simrad PI50 cabinet on the bridge and an extra hydrophone under the hull, you have a complete back-up system for the wireless sensors you already use on your FS70 system.

It is an easy task to receive trawl height, catch and depth information from the wireless sensors by adding only a few components to your existing setup.

The only sensor which demands that you make a choice is the PI Spread. This sensor must either point towards aft to transmit its information to the FS70 Trawl unit, or forward to send it to the PI hydrophone. Most users with both systems installed add a second adapter to each trawl door. That allows them to install the sensors any which way suitable for the job at hand, or even a double set of PI Spread sensors.

All the data from the wireless sensors can also be received by this additional PI system. This allows for an even more reliable instrument setup, as a failure to the FS70 will not leave you helpless, but still in control. You can even add additional sensors to the trawl and read these on the PI system, while the “main” sensors are handled by the Simrad FS70.



This this capture (from a simulated environment) shows the Simrad PI50 set up to work with a set of sensors: Depth, Spread, Height, Temperature and a Geometry set. Large and clear digits provide you with an instant feedback from the gear. As an additional feature, you can open any number of graphs to view the recent movements of selected sensors.

Current software version

The current software version for this product is:

  • Simrad DATSS (FS70/DFS75): v1.3.9 (2018-08-28)

Software release note

All applicable information related to this software release can be found in the Software Release Note.

Observe the link at the bottom of the page.

General information

We always recommend that you keep your products upgraded with the latest software version.

Whenever applicable, contact your local dealer for instructions. He can provide the software and the necessary software licenses (if required), and he will install the software for you. He can also provide other relevant advice related to the product and the installation.

You can only download the main product software applications from this website if you are one of our registered dealers or distributors. To download, log in through the Simrad Dealer Club.

Related links

End user documentation

A collection of end user manuals is provided. All can be opened and/or downloaded using the link below. The manuals are provided on several formats; PDF, EPUB and/or CHM. Selected manuals are also provided as separate websites.

Available documents

Húsi: kr. 28900,- u/mvg

Sonar: kr. 256000,- u/mvg

284900,- u/mvg