Naviknot Multisensor Speed Log

Naviknot Multisensor Speed Log

NAVIKNOT 350E / NAVIKNOT 450D / NAVIKNOT 600S

The NAVIKNOT Multisensor Speed Log Series is a new generation in a long line of Sperry Marine speed logs. The 350, 450 and 600 series offer unlimited flexibility and have been designed for all types and sizes of vessels.

The NAVIKNOT Multisensor Speed Log Series features two different-sized Control and Display Units (CDU) each with a large color TFT display and utilizes satellite-based technology (GPS) in addition to the traditional Doppler and electromagnetic sensors to provide the user with high-accuracy displays of dual-axis ground speed and/or single-axis water speed.

 

Highlights:

  • Simple and low-cost installation
  • Speed accuracy ±1% or 0.1 kn whichever is greater
  • Large color TFT display
  • Varied speed and distance interfaces
  • Double-end ferry mode
  • Miles counter
  • Separate damping for speed display and outputs
  • Displays longitudinal and transverse speeds
  • Support of docking maneuvers
  • Remote control and display units available in different sizes
  • Integrated take-over function Remote-to-Master
  • Type approved by Germanischer Lloyd

 

NAVIKNOT Features

The NAVIKNOT Multisensor Speed Log Series is a new generation in a long line of successful Northrop Grumman Sperry Marine speed logs. The 350, 450 and 600 series offer unlimited flexibility and have been designed with the most modern computer tools for application on all types and sizes of vessels including cruise ships, container ships, tankers, megayachts and a wide variety of other crafts, both new build, and retrofit.

Flexible and Innovative

The speed log measurement capability at slow speed is vital for precise docking of tankers to oil loading and unloading facilities, as well as safe navigation in narrow channels or straits. Operation at high speed assists economical cruising in open seas. While retaining the measurement accuracy the time for installation and space required for installation will be reduced.

Control and Display Units

The innovative NAVIKNOT Multisensor Speed Log Series features two different-sized Control and Display Units (CDU) each with a large color TFT display and utilizes satellite-based technology (GPS) in addition to the traditional Doppler and Electromagnetic Sensors to provide the user with high-accuracy displays of dual-axis ground speed and/or single-axis water speed.

Electromagnetic Sensor (Single-Axis Water Speed)

The electromagnetic sensor houses a coil which, when energized with an AC current, produces a magnetic field around the sensor in the surrounding water. The ship’s motion through the water produces an electrical field perpendicular to the magnetic field and the ship’s motion. The resulting signal is picked up by the sensor electrodes and fed to the preamplifier, where it is converted into a digital format and transmitted to the NAVIKNOT electronics unit.

Doppler Transducer (Single-Axis Water Speed)

The Doppler transducer utilizes the Doppler frequency shift effect to determine the speed of a vessel through the water. The transducer emits high-frequency sound pulses in the fore and aft directions through two transmitter windows. Two receiver windows in the transducer detect the return echo of the sound pulses. A time delay between pulse transmissions ensures that echoes are received from the undisturbed water outside the vessel’s boundary layer. The signals are processed to determine the ship’s fore/aft speed vector. The preamplifier transmits the speed information in a digital format to the NAVIKNOT electronics unit.

Satellite Sensor (Dual-Axis Ground Speed)

The satellite sensor makes use of GPS satellite signals to determine a ship’s longitudinal and transverse ground speeds. Two GPS receivers and three rate gyros integrated in an electronics unit, and a dual antenna unit, determine a vessel’s heading velocity, course, and attitude. While the heading is referenced to the ship’s fore-and-aft line, the velocity and course represent the motion vector, i.e. the magnitude and direction of its motion overground.

 

  • NAVIKNOT 350 E
    Electromagnetic Speed Log System, Single-Axis Water Speed
  • NAVIKNOT 450 D
    Doppler Speed Log System, Single-Axis Water Speed
  • NAVIKNOT 600 S
    Satellite Speed Log System, Dual-Axis Ground Speed, Docking Mode
  • NAVIKNOT 600 SE
    Satellite and Electromagnetic Speed Log System, Dual-Axis Ground, Speed and Single-Axis Water Speed, Docking Mode
  • NAVIKNOT 600 SD
    Satellite and Doppler Speed Log System, Dual-Axis Ground Speed and Single-Axis Water Speed, Docking Mode
  • Sperry Marine Naviknot Speed Log Systems - Brochure Download
  • Sperry Marine Naviknot 350E - Installation & Operation & Service Manual Download
  • Sperry Marine Naviknot 450D - Installation & Operation & Service Manual Download
  • Sperry Marine Naviknot 600DD - Installation & Operation & Service Manual Download
  • Sperry Marine Naviknot 600SD - Installation & Operation & Service Manual Download
  • Sperry Marine Naviknot 600SE - Installation & Operation & Service Manual Download
  • Sperry Marine Naviknot 600S - Installation & Operation & Service Manual Download

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Naviknot Multisensor Speed Log

NAVIKNOT 350E / NAVIKNOT 450D / NAVIKNOT 600S