CompassNet heading management system

Northrop Grumman Sperry Marine has designed the CompassNet heading management system to deliver an unrivalled system solution for comprehensive multiple heading management control. The CompassNet system uses Ethernet connection for all communication between the connected heading sensors and the heading distribution and heading management system. A complete new set of heading sensors, both spinning mass and fibre-optic, will be available for connection to CompassNet.

Reliable and cost effective control
CompassNet provides you with a system that is both reliable and easy to use. CompassNet offers many benefits, including:

Low cost and ease of installation, Outstanding performance Improved efficiency, Variety of configurations, Type-approved


Northrop Grumman Sperry Marine is the first company to employ Ethernet technology in its heading management systems. This reduces the complexity of installation, simplifies operational performance and guarantees improved reliability and navigational safety. With less wiring, it’s quicker, easier and less expensive for you to install and commission. Because there are fewer connections, it’s also easier to connect a range of additional equipment to enhance your heading management requirements.

Functionality is further simplified through the use of two 24V DC power sources for all components.


Key to the function of the CompassNet system is the Data Distribution Unit (DDU) with 1 or 2 processor boards, depending on the system configuration, the Control and Display Unit and the heading sensor(s).

The performance of CompassNet is further enhanced by integration with our new NAVITWIN V control and display unit and allows the connection of up to 5 heading sensors.


To give you maximum flexibility and convenience, the NAVITWIN V displays and monitors up to five heading sources (four gyrocompass headings and one magnetic compass heading) from a variety of heading sensors. The NAVITWIN V can provide a number of functions:

  • Heading source selector
  • Heading difference monitor
  • Off-heading monitor
  • Central gyrocompass control unit
  • Central service control unit.

The NAVITWIN V Control and Display Unit (CDU) is a progression from the successful NAVITWIN IV. We have designed the “Human Machine Interface” (HMI) to make use intuitive and to provide a wide range of benefits:

  • 4.3” bright colour display
  • All heading and sensor data and system information displayed
  • Alarm management with record of alarm history
  • Access to, and control of, all CompassNet components through one common CDU
  • Can install up to seven additional CDUs for extra