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Survey Equipment

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Edgetech 4125i Side Scan Sonar

  • Edgetech 4125i Side Scan Sonar

The EdgeTech 4125i Side Scan Sonar System is designed with both the Search & Recovery (SAR) and shallow water survey communities in mind. The 4125i utilises EdgeTech’s Full Spectrum® CHIRP technology, which provides higher resolution imagery at ranges up to 50% greater than non CHIRP systems operating at the same frequency. This translates into more accurate results and faster surveys, thus cutting down on costs. Two dual simultaneous frequency sets are available for the 4125i depending on the application. The 400/900 kHz set is the perfect tool for shallow water survey applications, providing an ideal combination of range and resolution. The 600/1600 kHz set is ideally suited for customers that require ultra-high-resolution imagery in order to detect very small targets (SAR).

All of the 4125 and 4125i systems available at Unique Group have the telemetry option. The towfish with added telemetry provides the ability to operate over longer tow cable lengths for operation in deeper waters.

The 4125i system can be powered by both AC and DC for added versatility and is delivered in portable rugged cases for ease of transport from site-to-site. As is standard with all of EdgeTech’s towed side scan systems, the 4125i comes with a safety recovery system that will prevent the loss of a towfish if it becomes snagged on an obstacle during a survey.

A standard 4125i System comes with a choice of towfish and a portable water-resistant topside processor with a laptop computer including EdgeTech’s easy-to-use Discover acquisition software. Various lengths of tow cable are available. A small V Fin depressor is also available on request.


  • Ultra-high-resolution imagery for easier identification of targets
  • Lightweight for one person deployment
  • Dual simultaneous frequencies
  • Choice of either a 400/900 kHz or 600/1600 kHz towfish
  • Standard heading, pitch, roll and depth sensors
  • Topside processor and laptop for open boat operations
  • Runs on AC or DC
  • Sets up in minutes and is easy to operate
  • The system is supplied in rugged portable cases for easy transport


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