Simrad SX90 Fish Finding Sonar


The Simrad SX90 allows you to choose an operational frequency between 20 to 30 kHz (in 1 kHz steps). The cylindrical multi-element transducer allows the omnidirectional sonar beam to be tilted electronically from +10 to – 60 degrees. This allows you to automatically track schools of fish, and to observe the whole water volume around the vessel. A stabilising system is included for electronic pitch and roll compensation. Great emphasis has been placed on giving the best possible sonar presentations on a high resolution colour display. The SX90 is equipped with Simrad’s celebrated signal processing software. It includes Hyperbolic FM transmissions (also know as “Chirp”) to ensure a clutter free picture with very high resolution in range. The signal processing and beamforming is performed in a fast digital signal processing system using the full dynamic range of the signals. In addition to the traditional single frequency transceiver system, the Simrad SX90 contains an advanced frequency modulated filter system (FM). The SX90 Processor Unit is controlled by Microsoft’s Windows® operating system, which result in a flexible choice of presentation modes for a large range of user applications.


  • 360° omnidirectional sonar
  • 90° vertical tip mode
  • 20 to 30 KHz operational frequency
  • Narrow beams
  • Selectable beam width
  • Hyperbolic FM
  • Large dynamic range
  • High definition
  • Stabilized beams
  • Dual beam operation
  • Easy operation
  • Store and recall sonar data
  • Define your own user settings
  • Clear and easily comprehensible sonar images


On the SX90 screen capture below, you can see that the sonar has detected three schools of herring. The skipper has decided to catch the school with highest density, and this is the school closest to the vessel. The sonar is in Automatic Target Tracking mode, and shows the tracks from the school and vessel. In the lower left corner you can see the course, depth and speed of the school; 179 degrees, 350 meters depth and 2,2 knots.

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