Notus Net Monitoring Systems

Notus Electronics Ltd. develope and manufacturer advanced, wireless net monitoring, gear finding and target detection systems.

Established since 1992, Notus has brought a number of sophisticated wireless monitoring systems to the market.

TRAWLMASTER FOR SINGLE-TRAWL / MULTI-TRAWL

THE NOTUS TRAWLMASTER PROVIDES OPTIMAL PERFORMANCE, FOR SUPERIOR RESULTS.

The Notus Trawlmaster is a wireless net monitoring system. Its design is based on more than 25 years of experience. Notus has worked closely with customers to offer sensors that provide reliable, real time data and convenience of use. With their unique and reliable Activ-Omni Intelligence, Notus offers the only net monitoring system to boast two-way communication, offering trawl wire lengths, AND true omnidirectional capabilities, providing sensor data when it’s needed most.

Notus Sensor Types…

DOORSPREAD SENSOR

Doorspread is the distance between the doors on EACH net. Major fuel savings are achieved with doorspread by adjusting the speed of the vessel to keep the optimal spread.
For example, towing just 0.1 knots too fast into a current can overspread the gear by 10 meters.

DOORSPREAD FOR EACH NET FOR TWIN & MULTI TRAWLS
  • Indicates when doors have crossed
  • Permits equal bilk on EACH net
  • Detects when door has fallen or is stuck.
  • Instantly see if a rock, pot or other debris is in the trawl
  • Notus has the only omnidirectional sensors on the market.
    Doorspread is provided on a turn with one door 100 meters behind the other
TRAWL WARP MEASUREMENT SENSOR

Doorspread and trawl wire lengths are standard Trawlmaster sensors. These sensors can be upgraded to include door depth, door angle and temperature.

Trawl Wire Lengths – Made possible by Activ-Omni Intelligence

By measuring EACH set of trawl wires to within 0.1 meter, the Notus Trawlmaster:

  • Avoids measuring trawl wires on shore
  • Indicates the adjustment in cross current to “square” the doors
MIDDLE WIRE ADJUSTMENT

The Notus Trawlmaster Middle Wire Adjustment indicates the exact middle wire adjustment to align the clump with the doors, to ensure optimal fishing!

The middle wire adjustment is calculated to align the middle weight (clump) with the doors in twin rigs

Middle wire adjustment indicates:

  • When the clump is ahead of the doors, the trawls overspread
  • When the clump is behind the doors, the trawls under-spread, which can lead to gear damage

CLUMP DEPTH SENSOR

Depth sensors indicate the distance from the surface to the middle weight or clump.

DOOR ANGLE SENSOR

Door angle sensors provide the heel angle (inward/outward lean) and pitch angle (upward/downward pitch).

TEMPERATURE SENSOR

Temperature sensors indicate temperature wherever the sensor is located.

HEADLINE HEIGHT SENSOR

Headline Height sensors use an echo sounder to measure the distance from the headline to the seafloor. An optional footgear clearance sensor can be added to monitor the net opening and footgear clearance.

CATCH SENSOR

Catch sensors indicate when the cod-end has a set amount of fish. Multiple sensors can be used to indicate different amounts of fish.

GRID/GRATE SENSOR

Grid sensors indicate angle of the sorting grid.

BOTTOM CONTACT SENSOR

Bottom Contact sensors confirm that the trawls are on bottom using angle measurements. The sensor is attached to the fishing line and remains horizontal when the trawls are on bottom. The sensor orientates in a vertical position when the trawls comes off bottom.

WINGEND SPREAD SENSOR

The Wingend Spread sensor provides the distance between the two wingends.