Naviknot Multisensor Speed Log Series is a series of marine speed logs from Sperry Marine, designed to measure and display vessel speed in various configurations. This series utilizes sensor technologies such as electromagnetic sensor, Doppler transducerWAASsatellite/GNSS sensor to meet the needs for measuring Speed Through Water – STWMX575C DGPS CompassSpeed Over Ground – SOG on a wide range of vessels.

The NAVIKNOT series is developed for various vessel types such as passenger ships, container ships, oil tankers, superyachts, commercial vessels, new builds, and retrofit projects. The flexible design allows users to select the appropriate measurement technology according to their needs: measuring Speed Through Water with electromagnetic/Doppler sensors or measuring Speed Over Ground with GNSS satellite technology.

Three main configurations: NAVIKNOT 350E, 450D, and 600S

According to DNV / MED certification,350E / 350EEis a single-axis electromagnetic speed log measuring speed through water,450D / 450DDis a single-axis Doppler speed log measuring speed through water, while600Sis a satellite speed log measuring two-axis speed over ground.

NAVIKNOT 350E – Electromagnetic speed log measuring speed through water

NAVIKNOT 350Euses an electromagnetic sensor to measure the vessel's speed through water. The measurement principle is based on the magnetic field generated by coils in the sensor; as the vessel moves through the water, this movement generates a corresponding electric field, which the sensor then picks up and converts into speed data.

The 350E configuration is suitable for vessels requiringSTW – Speed Through Waterdata, single-axis, for navigation, voyage calculations, integration with autopilot, VDR, speed display systems, or other devices requiring speed through water data.

NAVIKNOT 450D – Doppler Speed Log over water

NAVIKNOT 450Duses a Doppler transducer to measure the ship's speed through the water. Doppler technology works based on the frequency shift of the reflected sound pulse; the system emits high-frequency sound pulses in the fore / aft direction, receives the reflected signal from the undisturbed water layer not close to the hull, and processes it into the ship's forward / backward speed vector.

The 450D configuration is suitable for vessels requiring stable, high-accuracy speed logs over water and integration capabilities with professional marine navigation systems.

NAVIKNOT 600S – GNSS Satellite Speed Log measuring dual-axis speed over ground

NAVIKNOT 600Suses satellite technologyGNSS/GPSto determine the ship's speed over ground. According to Sperry Marine brochures, theNAVIKNOT 600 Seriesuses GNSS satellite technology for high accuracy and performance; the600Sspecifically does not require a hull-penetrating transducer, simplifying installation and maintenance.

NAVIKNOT 600S providesThe NAVIKNOT 600S is a satellite/GNSS speed log system, measuringdata, i.e., speed along the longitudinal and transverse axes relative to the ground. This data is very useful for port approaches/departures, ship maneuvering, docking, operating in narrow channels, or when monitoring the ship's lateral movement.

Speed accuracy ±1% or 0.1 knot

Line NAVIKNOT Multisensor Speed LogThe series has a stated speed accuracy of±1% or 0.1 knot, whichever is greater. This accuracy supports critical navigation decisions, especially during berthing, docking, navigating narrow channels, or when precise vessel speed control is required.For large vessels such as tankers, container ships, or cruise ships, accurate speed data helps reduce maneuvering risks, supports autopilot systems, VDR, and integrated bridge systems.

Large color TFT display, easy to monitor day and night

The NAVIKNOT series uses a

with aControl and Display Unit – CDULarge color TFT, supporting day/night modes and available for console or bracket mounting. The system also offers an optionalremote control and display unitin various sizes, suitable for secondary speed display locations on board.The display clearly shows data such as speed, distance traveled, direction of motion, system status, alarms, and related parameters, assisting marine officers in monitoring during operation.

Supports docking, double-end ferry mode, and miles counter

NAVIKNOT supports various practical operational functions such as

docking modedouble-end ferry mode, miles counter, , selection of individual damping for display and output, and,, selection of individual damping for display and output, and"separate damping" function allows setting different delay/damping for the display and output signals, ensuring data is both easy to read on the display and meets the requirements of data receiving devices such as autopilot, VDR, or monitoring systems.

Diverse data communication and outputDiverse data communication and outputAccording to DNV certification, NAVIKNOT systems have

6 NMEA outputs according to IEC 61162-1

, pulse outputs 6 NMEA outputs according to IEC 61162-1, analog speed outputs 0–10V and 4–20mA, power loss/log failure alarms, speed limit relay for steering systems, and bidirectional alarm interface according to IEC 62923-1Rich communication capabilities make NAVIKNOT easy to integrate with radar, ECDIS, autopilot, VDR, cockpit monitoring systems, speed repeaters, alarm management systems, and other marine equipment.MED certification and maritime standards.

DNV/MED certification lists NAVIKNOT models including

350E, 350EE, 450D, 450DD, 550DD, 600S, 600SD, 600SDD, 600SDT, and 600SE

as SDME speed and distance measuring equipment, complying with the requirements of the Marine Equipment Directive and relevant IMO/IEC standards. This certification also specifies tests such as IEC 60945, IEC 61162-1, IEC 61162-2, IEC 62288, IEC 62923-1/-2, and IEC 61023.SDME, complying with the requirements of the Marine Equipment Directive and relevant IMO/IEC standards. This certification also specifies tests such as IEC 60945, IEC 61162-1, IEC 61162-2, IEC 62288, IEC 62923-1/-2, and IEC 61023.

Key features of Naviknot Multisensor Speed Log

• Line Speed and Distance Measuring Equipment – SDME for ships.
• Main models: NAVIKNOT 350E, 450D, 600S.
• 350E uses electromagnetic sensors, measures speed through water on one axis.
• 450D uses Doppler transducer, measures speed through water on one axis.
• 600S uses satellite/GNSS, measures speed over ground on two axes.
• Speed accuracy ±1% or 0.1 knot, whichever is greater.
• Display , supporting day/night modes and available for console or bracket mounting. The system also offers an optional, supports day/night mode.
• Displays fore and aft speed depending on the model.
• Supports docking maneuvers.
• Yesmiles counter.
• Yes, selection of individual damping for display and output, and total/day.
• Separate damping for display and output.
• Support remote control/display units of multiple sizes.
• Takeover functionRemote-to-Master.
• CommunicationIEC 61162 / NMEA and multiple pulse, analog outputs.
• Type-approved according to MED/DNV for NAVIKNOT series models.

Quick comparison NAVIKNOT 350E / 450D / 600S

System configuration and related accessories

A NAVIKNOT Speed Log system can include:FunctionFunctions

Applications of Naviknot Multisensor Speed Log

NAVIKNOT Multisensor Speed LogSuitable for:

• Commercial vessels.
• Container ships.
• Tankers.
• Passenger ship, cruise ship.
• Superyacht and megayacht.
• Offshore service vessel.
• Double-end ferry.
• Vessels require accurate docking data.
• Integrated bridge system.
• Vessels require SOG or STW data for radar, ECDIS, autopilot, VDR and repeater.
• New build, retrofit or upgrade project from older speed log.

Why choose Naviknot Multisensor Speed Log?

Naviknot Multisensor Speed Log is a suitable choice when a flexible vessel speed measurement system with multiple sensor technologies and easy integration is needed. Users can choose the 350E for electromagnetic speed through water measurement, the 450D for Doppler speed through water measurement, or the 600S for dual-axis GNSS speed over ground measurement. The product line offers high accuracy, color TFT displays, multiple data interfaces, and supports operational functions such as docking, double-end ferry mode, miles counter, and remote display.

For ship owners, ship management companies, and marine service providers, NAVIKNOT is a suitable solution for both new installations and upgrades of speed log systems, especially when connection to multiple marine devices is required and SDME standards must be met.

Notes when ordering Naviknot Multisensor Speed Log

, please check:NAVIKNOT Multisensor Speed LogIs the system

• Need model 350E, 450DMX575C DGPS Compass600S.
• Does the vessel need to measure STW – Speed Through WaterMX575C DGPS CompassSOG – Speed Over Ground.
• Does the system need to measure single-axis or dual-axis?
• Is docking mode or double-end ferry mode required?
• Does the package include CDU, Electronics Unit, sensor, preamplifier, GNSS antenna, or transducer?
• Are Universal Digital Repeater, analogue speed indicator, or remote display required?
• Does the data receiving equipment require IEC 61162-1, IEC 61162-2, pulse output, analog 0–10V, or 4–20mA?
• Is the sensor installation location suitable, especially for EM sensor/Doppler transducer through the hull?
• For, please check the condition of the GNSS antenna and its installation location.600SThe equipment is new, stock, used or refurbished.
• After installation, calibration, alarm, output, repeater, and data supplied to VDR/ECDIS/autopilot need to be checked.
• What is the Naviknot Multisensor Speed Log?

FAQ – Frequently Asked Questions

The Naviknot Multisensor Speed Log is a series of marine speed and distance measuring equipment

from Sperry Marine, used to measure SOG or STW using electromagnetic, Doppler, or satellite/GNSS sensors depending on the model.SDMEWhat technology does NAVIKNOT 350E use?

The NAVIKNOT 350E is an electromagnetic speed log system, measuring

single-axis water speedHow does NAVIKNOT 450D differ from 350E?.

The NAVIKNOT 450D uses a

Dopplertransducer to measure single-axis water speed, while the NAVIKNOT 350E uses anelectromagneticsensor..

What type of speed does NAVIKNOT 600S measure?

dual-axis ground speedThe NAVIKNOT 600S is a satellite/GNSS speed log system, measuringDoes NAVIKNOT output NMEA data?

What is the accuracy of the NAVIKNOT line?

NAVIKNOT line speed accuracy is announced as±1% or 0.1 knot, whichever is greater. This accuracy supports critical navigation decisions, especially during berthing, docking, navigating narrow channels, or when precise vessel speed control is required..

Yes. According to DNV certification, the system has

Yes. According to DNV certification, the system has6 NMEA outputs according to IEC 61162-1, in addition to pulse output, analog, and alarm interfaces.