2019 11 12 NORTEK Produkter0933 main picture
VM Operations 333 k Hz Sea valve
VM Operations 333 k Hz
Processing Unit
Ops software web
2019 11 12 NORTEK Produkter0933 main picture
VM Operations 333 k Hz Sea valve
VM Operations 333 k Hz
Processing Unit
Ops software web


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


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.

  • Currents
  • Bottom track


  • 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


The in-water serviceable sea valve solution is a convenient mounting choice for offshore operational vessels. The transducer head can also be mounted with a bracket for permanent pole or hull mount structures. The system connects to a junction box for power and communication.


A type-approved sea valve solution makes the ADCP in-water serviceable. Data is streamed directly from the hull of the vessel into the control room in real time during operation.


Designated software provides real-time current speed and direction in a 3D profile plot below the vessel, a history plot for predicting future windows of opportunity, as well as other views of information from the system for operators to make decisions at a glance. Data can also be easily fed into a third-party software.

Download PDF

Profiling range*

100 m

Cell size

1-6 m

Max no. cells


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

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

Temperature sensor range /accuracy

-4 °C to 40 °C / 0.1 °C




Solid State magnetometer


Solid State accelerometer


Attitude sensor (option)


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

Instrument materials

POM with Titanium fastener

Instrument weight

7 kg


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


Intel i5/8 GB

Hard disk

SSD, 256 GB

Operating system

Windows® 10


19" rack-mountable 2 HE


482x87x400 mm


110-240 V AC, 100 W Max

Total weight

7 kg


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

Acquisition input

Signature VM - binary


Signature VM ADCP, Alignment offsets, Outputs


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


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.

VM 333 kHz ADCP
Single bottom configuration Sea valve
Double bottom configuration Sea valve

Sea valve type approval

Signature333 VM

4-beam concave head

Short, no room for battery

16 GB data logger

Pressure sensor 0-50 m, 0.1%

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

Other: 20 m Ethernet cable with MCIL8M and MCIL8F

Sea valve (option)

Pole mount bracket (option)

Hull mount bracket (option)

Compass and Tilt sensor


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