VM Operations (333 kHz)

Assists operators on vessels to make informed decisions during subsea operations in areas affected by underwater currents

  • User-friendly software layout gives operators the information they need at a glance
  • In-water serviceable instrumentation, DNV type-approved sea valve solution
  • Salinity-independent velocity measurements
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  • In recent years, offshore operations have moved farther offshore, often into challenging operational environments. Variable local current and tide patterns make for increased risk, uncertainty, and operational costs. Subsea operations can be limited by these challenges without real-time knowledge of currents.

    Using our renowned Signature ADCP technology, the VM Operations is designed to give offshore operators clear and detailed information on current speed and direction from the vessel to the seafloor. This situational awareness improves efficiency during vessel time. Data can be stored and analyzed during future project planning.

    Read more about the VM Operations capabilities here.


  • Concave transducer design allowing for flush mounting, independent of salinity changes
  • A 333 kHz frequency for an optimal balance in required range, resolution and accuracy for a wide range of operations at the coastal continental shelf
  • Outstanding bottom-track performance, even under challenging conditions
  • Robust sea valve allows mounting without increased draft
  • In-water serviceable, diverless, concept via the DNV type-approved sea valve
  • Unique, easy-to-use graphical ADCP interface for the operator, superintendent or client


  • ROV and diver inspections
  • Subsea installations (as cable laying or rock dumping)
  • Towed (seismic) surveys
  • Aid to navigation
  • Fuel efficiency monitoring
  • Load calculation
  • Insight planning upcoming projects
  • Aid to navigation

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    • Water velocity measurements

      Profiling range* 100 m
      Cell size 1-6 m
      Max no. cells 128
      Min. blanking 0.5 m
      Minimum accuracy 0.3% of the measured value
      Velocity resolution 0.1 cm/s
      Maximum sampling rate 2 Hz
      No. of beams 4 slanted beams at 25 degrees
      *) Maximum range depends on acoustic scattering conditions and transmit power
    • Bottom velocity measurements

      Single ping std @ 3 m/s 0.5 cm/s
      Long-term accuracy (1) ± 0.3 %
      Minimum altitude 0.3 m
      Maximum altitude (2) 150 m
      Velocity resolution 0.01 mm/s
      Maximum sampling rate 2 Hz
      (1) Following standard callibration procedures
      (2) Bottom-track distance dependent upon bottom type
    • Other, Vessel Mounted ADCP

      Temperature sensor range /accuracy -4 °C to 40 °C / 0.1 °C
      Pressure Piezoresistive
      Compass Solid State magnetometer
      Tilt Solid State accelerometer
      AHRS Attitude sensor (option)
      IO Ethernet (DF21 over serial as option)
      DC Input 24 V DC
      Operating temperature 0 °C to 40 °C
      Storage temperature -20 °C to 60 °C
      Depth rating Bottom track is limited to surface vessels
    • Mechanical

      Instrument materials POM with Titanium fasteners
      Instrument weight 7 kg
      Installation Instrument to be flush mounted with hull (sea valve solution)
      Sea valve (option) DNV type approval; TAS00002CU
      Sea valve material Ductile Iron (body), Bronze (seat)
      Sea valve weight 85 kg
      Bell housing material Steel DIN17121
      Bell housing weight 29 kg
    • Processing unit

      Processor/memory Intel i5/8 GB
      Hard disk SSD, 256 GB
      Operating system Windows® 10
      Housing 19" rack-mountable 2 HE
      Dimensions 482x87x400 mm
      Input 110-240 V AC, 100 W Max
      Total weight 7 kg
      Connections* Power, Signature ADCP, 2x DisplayPort, 1x LAN, 2x USB, 4x RS232|RS422|RS485 configurable port*
      *) Processing unit requires heading and GNSS input over Serial or Ethernet
    • Nortek VM Operations acquisition software

      Acquisition input Signature VM - binary
      Configuration Signature VM ADCP, Alignment offsets, Outputs
      Display Vessel track in map, Bottom-track magnitude, direction and depth: (SOG), (COG), Speed Through Water (STW), Mean water column magnitude and direction, 4x depth selectable layer (magnitude and direction), 3D velocity profile (magnitude and direction), 2D vessel cross track current, 24h mean current and direction history (tides), Notes, Echo correlation, Echo amplitude
      Status Signature VM BT and VB + NMEA GGA, HDT, VTG
      Online output NMEA data formats or binary AD2CP with embedded NMEA. DF21 BT proprietary (optional)
      Post processing Signature review software (optional)
      Multi vessel display VM Operations streaming data and display (optional)
      *Please note that the package includes the VM Operations acquisition software. The post-processing Review software is optional.

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    • Main product


      Signature333 VM

    • Probe type / Head


      4-beam concave head

    • Housing


      Short, no room for battery

    • Memory


      16 GB data logger

    • Pressure sensor


      Pressure sensor 0-50 m, 0.1%

    • Cables


      Sea valve: 10 m Ethernet cable with MCIL8F-PWR/RJ45


      Other: 20 m Ethernet cable with MCIL8M and MCIL8F

    • Mounting


      Sea valve (option)


      Mounting bracket (option)

    • Other


      Compass and Tilt sensor



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