Signature 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, 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.

    The Signature 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.


  • 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 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
  • Dynamic Positioning (DP) input
  • Fuel efficiency monitoring
  • Load calculation
  • Insight planning upcoming projects

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    • Water velocity measurements

      Profiling range* 125 m
      Cell size 1-6 m
      Max no. cells 128
      Min. blanking 0.5 m
      Minimum accuracy 0.3% of the measured value ± 0.3 cm/s
      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) (3) >1.01%
      Minimum altitude 0.3 m
      Maximum altitude (2) (3) 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
      (3) Inquire for more options
    • Other, Signature VM 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
      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) 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, 500 GB
      Operating system Windows® 10
      Housing 19" rack-mountable 2 HE
      Dimensions 480x90x3400 mm
      Input 24 V DC, 20 W typical
      Total weight 4.5 kg
      Connections Power, Signature ADCP, 2x HDMI, 2xLAN, 3x USB, 4x RS232|RS422|RS485 configurable port
    • Nortek Signature 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
      Post processing Signature review software (optional)
      Multi vessel display Signature VM Operations streaming data and display (optional)
      *Please note that the package includes the Signature VM Operations acquisition software. The post-processing Signature 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


      5 or 20 m Ethernet cable (specify length) with MCIL6MP-PWR/RJ45

    • Mounting


      Sea valve (option)

    • Other


      Compass and Tilt sensor




      Heading GNSS (RTK)

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