SPERRY MARINE - NAVIKNOT Multisensor Speed Log

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 colour TFT display, and utilises 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 colour 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 manoeuvres
  • Remote control and display units available in different sizes
  • Integrated take-over function Remote-to-Master
  • Type approved by Germanischer Lloyd

Overview
Specifications
Documents

NAVIKNOT Features

NAVIKNOT Speed Velocity Log
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 colour 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.
 
 
NAVIKNOT Control and Display Unit (CD) in a housing with bracket attachment
 
 
Full Features of the NAVIKNOT series:
 
  • Simple and low-cost installation
  • Speed accuracy ±1% or 0.1 kn whichever is greater
  • Large colour 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 manoeuvres
  • Remote control and display units available in different sizes
  • Integrated take-over function Remote-to-Master
  • Type approved by Germanischer Lloyd
 
Electromagnetic Sensor (Single-Axis Water Speed)
The electromagnetic sensor houses a coil which, when energised 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 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 over ground.
 
 

Display Unit Specifications

NAVIKNOT Speed Velocity Log
The NAVIKNOT multisensory speed log series houses a range of models that each perform differently, depending on whether they have an Electromagnetic Sensor, Doppler Transducer or Satellite Sensor.
 
See below for an overview of the NAVIKNOT series performances:
 
NAVIKNOT 350 E
Electromagnetic Speed Log System, Single-Axis Water Speed
  • Master Control and display unit
  • Digital and analogue speed repeaters
  • Electronics Unit
  • Preamplifier
  • Compatible sensors: NF Type 2829, FNF III Type 4874, FNFII Type 4120, FN I Type 4040 or FNF I type 4726
  • Optional Remote Control and Display Unit
  • Optional Digital and analogue speed repeaters
NAVIKNOT 450 D
Doppler Speed Log System, Single-Axis Water Speed
  • Master control and display unit
  • Electronics Unit
  • Preamplifier
  • Compatible transducers: Doppler Transducer in gate Valve  
  • Optional Remote Control and Display Unit
  • Optional Digital and analogue speed repeaters
NAVIKNOT 600 S
Satellite Speed Log System, Dual-Axis Ground Speed, Docking Mode
  • Master control and display unit
  • Electronics unit
  • Dual satellite antenna
  • External Heading and Rate of Turn for enhanced docking accuracy
  • Optional Remote Control and Display Unit
  • Optional Digital and analogue speed repeaters
NAVIKNOT 600 SE
Satellite and Electromagnetic Speed Log System, Dual-Axis Ground, Speed and Single-Axis Water Speed, Docking Mode
  • Master control and display unit
  • Dual satellite antenna
  • Electronics unit
  • Preamplifier
  • Compatible sensors: NF Type 2829, FNF III Type 4874, FNF II Type 4120, FNF I Type 4040 or FNF I Type 4826
  • Optional Remote Control and Display Unit
  • Optional Digital and analogue speed repeaters
  • External Heading and Rate of Turn for enhanced docking accuracy
NAVIKNOT 600 SD
Satellite and Doppler Speed Log System, Dual-Axis Ground Speed and Single-Axis Water Speed, Docking Mode
  • Master control and display unit
  • Dual satellite antenna
  • Electronics unit
  • Preamplifier
  • Compatible transducers: Doppler Transducer in Gate Valve
  • Optional Remote Control and Display Unit 
  • Optional Digital and analogue speed repeaters
  • External Heading and Rate of Turn for enhanced docking accuracy