Northrop Grumman has recently introduced a new family of multi-sensor marine speed log products. The NAVIKNOT 600 series of products, which are being marketed under the Sperry Marine brand, are based on a new satellite speed sensor that yields dual axis speed over ground. The satellite speed log can serve as a standalone device or be integrated with a single-axis electromagnetic or Doppler speed log. The three-way satellite-electromagnetic-Doppler combination provides maximum built-in flexibility and redundancy.

The NAVIKNOT 600 systems use a twin GPS antenna array to measure the ship’s heading, velocity, course and altitude. The unit’s processor uses the GPS data, integrated with output from rate gyros, to calculate longitudinal and transverse speed over ground with accuracy of ±1 percent or 0.1 knots, whichever is greater. In the docking mode, the display shows a graphic diagram with rate of turn, bow and stern side-to-side speed over ground and other useful data.

Speed log data is shown on a large, bright, high-resolution display screen. A range of remote control and digital and analog repeater displays are also offered. The NAVIKNOT multi-sensor speed logs are type approved by Germanischer Lloyd to the European Union Marine Equipment Directive 96/98/EC.