Trawlmaster for Other Multi Rig Trawls

MultiRig with Sensor

Focus Hydrophone2
Door and Catch Sensors
Trawlmaster Double Rif (ESP)
Bottom Contact


The Trawlmaster has been installed on vessels towing from outriggers, on triple trawls and on quad trawls. No matter the trawl gear, critical answers are provided to the Captain.  Are my trawl wires marked correctly? Are my trawls spread optimally? Are the trawls on bottom? The Trawlmaster provides the answers by attaching small robust trawl sensors to the gear. All information is transmitted to the vessel wirelessly.


The spread on EACH net is provided. Spread information reduces fuel by allowing you to keep the optimal door spread.

  • Allows you to take equal bulk in EACH net.
  • Adjust vessel speed to keep optimal doorspread.
  • Indicates when the footgear is going into the mud.
Trawl Warp Measurement
The distance from the vessel to EACH trawl door.

  • Accurately measures your trawl wires to within 1/2 meter.
  • Avoids measuring your trawl wires on shore.
  • Indicates the adjustment in cross current to “square” the doors.
Warp Length
Door Angle
The heel angle (inward/outward lean) and pitch angle (upward/downward pitch).

  • Set the trawl doors for optimal spread and optimal fuel consumption.
  • Instantly indicates if you shoot too much trawl wire as the door heels over.
  • Indicates when the doors are on bottom.
Door Angle
Headline Height
Indicates the distance from the headline to the seafloor.

  • Indicates when your trawls are on bottom.
  • Allows you to raise and lower the headlines depending on species.

Headline Height
Indicates when the cod-end is full.

  • Only take back what you can handle onboard.
  • Prevents hauling back trawls that are only half full.
  • Provides a better indication of exactly where the fish are in the tow.



Bottom Contact
Indicates if the trawls are on bottom.

  • Fishing is greatly reduced once your trawls comes off bottom.
  • Indicates if the current is taking the trawl off bottom.
  • If you do not shoot enough wire, the trawl will not be on bottom.

Bottom Contact

Depth and Temperature

  • Depth sensors indicate the distance from the surface to the door.
  • Ensures the door remains on bottom.
  • Too little wire out or towing too fast can bring the door off bottom.
  • Locates fish by trawling in the right temperature range.
  • Avoid by-catch with temperature.


Temp Depth
Grid Angle
Indicates the sorting grid angle.

  • If your grid is not at the right angle, nothing goes to the cod-end.
  • Indicates if your grid is blocked.
  • Estimate fish volume in the codend as the grid angle tends to increase with volume.

Wingend Spread
Provides the distance between the wingends.

  • Keeping the optimal wing spread can be just as important as doorspread.
  • Wingspread is a critical piece of information for researchers in calculating swept area.


Trawl Door Height
Trawl door height monitors the distance from the door to the seafloor.

  • Height is critical to the successful operation of semi pelagic doors that fly very close to the bottom.
  • Equal door heights translate to optimal fishing.
Headline Height