Speed Log System

Ultimate Speed Log Flexibility

The NAVIKNOT Multi-sensor Speed Log series comprises a uniquely flexible range of speed log systems, for use on many types of vessels, such as cruise ships, container ships, tankers, superyachts and a wide variety of other craft. Northrop Grumman Sperry Marine has a long and successful history of providing high-accuracy speed logs, and is unique in using both Doppler and electromagnetic sensors, as well as satellite technology. This experience and capability guarantees you the performance you require, whether in new-build or for upgrades or retrofits, complementing the existing technology in use.


  • Low cost, easy installation and service
  • Flexibility of choice and performance
  • Wide range of functions
  • Variety of configurations
  • Full type-approval
  • 24/7 worldwide support

Technical Specifications

Multi-sensor Speed Log series
The NAVIKNOT 600 series of speed logs all use GNSS satellite-based technology, which provides the ultimate in accuracy and performance.

Speed accuracy ± 1% or 0.1 knot, whichever is greater

Large colour TFT display

Day/night modes

Selectable display colours & Optional remote control and display units available in different sizes

Universal Digital Repeater/Analogue speed indicators/Remote docking display (for 600 Series)

Supported by one of the world’s most extensive worldwide service networks, with help available around the clock, 24 hours a day, 365 days a year.

Type approved performance
All the systems in the NAVIKNOT Speed Log series are type-approved to MED 96/98/EC.