Simrad SN90 Fish Finding Sonar



Key facts

  • Up to 160 degrees horizontal coverage
  • Up to 60 degrees vertical coverage
  • Five separate inspection beams
  • 0 to 60 degrees tilt
  • Operational frequency band from 70 to 120 kHz
  • Narrow vertical beam
  • Hyperbolic FM transmissions (“Chirp”)
  • Wide bandwidth
  • Large dynamic range
  • High resolution
  • Stabilized beams
  • Easy operation
  • Store and replay raw sonar data
  • Define and save your own user settings
  • Cost efficient solution



On a trawler, the forward looking transducer is mounted on the vessel’s bow, well protected against acoustic noise from hull, machinery and propellers. The high resolution and long range allows you to detect and investigate single fish and schools - even those close to the bottom - from a distance of several hundred meters. The sonar beams point forward in a 120 degrees swath.

Purse seiner

On a purse seiner, the side looking transducer gives you full control over the setting of the seine. It is installed on the side of the hull facing the purse seine. There is no need to retract the transducer using a large hull unit. A large horizontal coverage area provides you with the full overview. The 256 individual beams have a horizontal coverage area of 160 degrees and the vertical beam width is typically 5 to 8 degrees (varies with the frequency).

Online simulator

Our online simulator allows you to experiment with the powerful features offered by the SN90 inspection beams. Each inspection beam can be controlled individually. Try the simulator here

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