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GeoAcoustics Ltd GeoSwath 4R 125 kHz

Portable wide angle multibeam and co-registered side scan in a splash proof deck unit suitable for use in depths to 200m

GeoSwath 4R offers the industry’s most efficient simultaneous swath bathymetry and side scan seabed map¬ping system for shallow water. Bathymetry data accuracies have been shown to exceed the IHO Standards for Hydrographic Surveys, while providing seafloor coverage of up to 12 times the water depth and data from nadir to the waterline.

  • GeoAcoustics Ltd GeoSwath 4R 125 kHz
GeoAcoustics Ltd
Shuttleworth Close
NR31 0NQ Great Yarmouth
United Kingdom
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The side scan data can be calibrated for repeatable results to provide seabed classification and monitoring. The new hardware provides twice the data density and increased nadir performance compared to its predecessors in a rugged portable design. The specifically developed GS4 acquisition and processing software included with the system delivers automatically cleaned data in real time. The splash protected deck unit is designed to be deployed on small vessels, RIBs and jet skis equipped with a 24 V power supply.

System Components

The GeoSwath 4R turn-key solution comprises a dual transducer head and a splash protected deck unit containing the complete sonar electronics, which can be interfaced via an Ethernet connection to the control laptop PC running the new GS4 software.

Dual sonar head

The transducers are available in a choice of three frequencies: 125, 250, 500 kHz, varying in depth performance and data resolution depending on the survey task. A wide range of motion reference units (MRU) and sound velocity sensors (SVS) can be mounted on the compact head. This has been designed for easy deployment on a supplied pole for over-the side or bow-mount options.

Deck Unit

The compact splash protected housing contains the complete system electronics. All peripheral sensors (position, motion, heading, transducer face sound velocity, sound velocity profiler and tide) are interfaced directly via IP66 rated connections. The system has been newly designed for increased performance. It offers twice the data density compared to its previous versions and increased nadir performance. All peripheral sensors (position, motion, heading, transducer face sound velocity, sound velocity profiler and tide) are interfaced directly.

GS4 Software

The GS4 software has been specifically designed for the new GeoSwath 4. It is included with the system and provides a complete project based solution; acquisition, storing and editing of sonar and ancillary data, grid-based patch test calibration, data processing, advanced bathymetry data gridding, side scan mosaicing and 3D data visualisation. Newly developed filter algorithms provide real time processed data with minimum user intervention even in difficult survey situations involving vertical structures, shipwrecks and steep seabed slopes.


  • Date of first release
  • Mounting
    Hull mounted & Portable
  • Retractable
  • Length [m]
  • Width [m]
  • Height [m]
  • Min. external power [V]
  • Max. external power [V]
  • Max. power consumption [W]
  • Transducer Head Weight, appr. including peripherals
    44 kg
  • Type of system
    Phase Measuring Bathymetric Sonar
  • Min. frequency [kHz]
  • Max. frequency [kHz]
  • Min. depth [m]
  • Max. depth [m]
  • Depth resolution [mm]
  • Max. Slant Range [m]
  • Max. swath as a function of depth
  • Ping frequency [Hz]
  • Min. beam width along track [deg]
  • max Swath Update Rate
    30 per second (range dependant)
  • Transducer Type
    Standard Dual Head
  • Pulse Length
    User selectable
  • Max. swath width [m]
  • Equal footprint spacing
  • Intended S44 order
  • Real-time correction of refraction at transducer head
  • Real-time integration of SV-profile
  • Motion sensors compatible to the system
    All standard
  • Required pitch uncertainty [deg]
  • Required roll uncertainty [deg]
  • Required heave uncertainty [m]
  • Compatible software
    All standard processing packages including QPS Qinsy and Hypack (real time) and Caris HIPS and SIPS; IVS3D Fledermaus
  • Compatible hardware
    All standard
  • Real-time access procedure
    Data broadcast via Ethernet or file export
  • Distinguishable features
    Co-registered side scan as well as bathymetry. Wide 240 degree beam angle.

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