Multibeam echosounder (Max. 500 m)

The EM 2040C MKII is a shallow water multibeam echo sounder based on EM 2040 technology. It is an ideal tool for any high resolution mapping and inspection application. With the release of the EM 2040 MKII series Kongsberg Maritime has upgraded the hardware and software to increase the swath and improve the data quality of our EM 2040 series.

Key facts and Operating Performance

The system fulfils, and even surpasses, IHO-S44 Exclusive with one sonar head, allowing coverage of 5.5 times water depth and the more stringent LINZ specification. For a dual transducer system, 200° angular coverage or 10 times the water depth is achieved on a flat bottom. The operating frequency range is from 200 to 400 kHz with frequency selection in steps of 10 kHz. The operator can on the fly choose the best operating frequency for the application: 300 kHz for near bottom, 200 kHz for deeper waters and 400 or 700 kHz for very high resolution inspection. 700 kHz inspection mode provides the highest resolution available contained within a narrow 30° swath.

Advanced Functionality and Component Integration

By alternating between the frequency modes per ping, the system is capable of providing the operator with Multi Frequency Backscatter of up to 5 frequencies in a single pass. The same functionality allows the system to alternate between a full swath mode and a high resolution mode providing full coverage while maintaining ultra high resolution over a target. By utilizing both CW and FM chirp pulses, the system can achieve long range capability and still maintain a high resolution. The maximum depth range for a dual head system in cold ocean water is 520 m at 200 kHz with a swath width up to 700 m.


The basic EM 2040C MKII has three components: a sonar head, a processing unit and a workstation. The EM 2040C MKII can be delivered with the standard processing unit or a IP67 rated (24 VDC) portable processing unit. For real-time motion stabilization and compensation, data input from a motion sensor, heading and a positioning system is required. A sound speed profile of the water column is recommended for realtime correction, especially for a dual head system. The sonar head(s) may be delivered mounted on a frame together with the motion sensor and a sound speed sensor, factory aligned for ease of mounting. All electronics are contained in the sonar head(s) which is inter-faced to the processing unit via GBit Ethernet. The processing unit also supplies 48 VDC power via the same cable. Operator control, data quality inspection and data storage is handled by the hydrographic workstation running SIS software or by 3rd party software. EM 2040C is also available in a 1500m depth rated version with a 130° swath for ROV or AUV operations.

Key features

  • High resolution
  • Wide frequency range
  • Short pulse lengths and large bandwidth
  • Extended range due to Frequency Modulated (FM) chirp
  • Complete roll and pitch stabilization
  • Nearfield focusing both on transmit and receive
  • Water column data (standard)
  • Seabed image (standard)
  • Sonar head is depth rated to 50 m
  • Easy to install, convenient for small boats
  • Single and Dual Head models
  • Dual swath (multiple pings)

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