SeaNav 300

The SeaNav 300 navigation sensor is tested and approved in accordance with international regulations as a THD (Transmitting Heading Device), GPS, GLONASS and SDME (Speed and Distance Measurement Equipment). SeaNav 300 has Wheelmark approvals for all functions and provides true heading with no moving parts. The navigation instrument replaces several vessel instruments with one compact navigation package outputting heading, position, velocity and rate of turn. SeaNav 320 has a built-in IALA beacon receiver and is approved as a DGPS in addition.


  • Surface
  • GNSS reciever
  • IALA beacon reciever
  • Inertial measurement unit (IMU)
  • GNSS infrastructure
  • Sensor fusion
  • Inertial measurement unit
  • GNSS

Integration and Reliability

The SeaNav is designed for integration with other navigation equipment and will as default be configured and operated from an ECDIS without the need for a separate external display. The Sensor Unit contains two GNSS receivers and an inertial rate sensor. All operation and functionality are handled from the ECDIS in an integrated bridge system. In case of GNSS signal loss, the inertial sensor automatically takes over as the prime source for heading determination until the GNSS comes back online, ensuring accurate, continuous and robust heading and position information.


One important principle of e-navigation is to reduce the number of displays on the bridge. The navigator needs to have important information easily available in order to reduce response time for decisions. Better integration will lead to a better bridge environment and a simpler installation. A display solution is available and provided when needed.

Performance and Ease of Use

Precision heading is derived from the fixed-distance dual GNSS antenna arrangement in the antenna module, using carrier phase data to generate heading information independent of latitude and vessel dynamics. GNSS position and velocity are calculated from both of the two antennas, which gives total redundant position and velocity sources in this product. The inertial element provides yaw information. The unit is easy to install and maintain, requires no scheduled maintenance or recalibration, and is easily configured via a built-in WEB user interface. Software updates are supported via the WEB UI but also the locally available USB interface.

Key features

  • Key Features for the SeaNav 300 Series include:
  • True heading anywhere on earth
  • Better than 0.5º heading accuracy
  • Heading accuracy unaffected by the latitude
  • Heading available in periods of GNSS drop-outs
  • Compliant to WAAS, EGNOS, and MSAS Satellite Based Augmentation Systems
  • Replaces several instruments with one robust, integrated product
  • Configurable update rate with default 20 ms (50 Hz)
  • Output of data on Ethernet
  • 1PPS out synchronization signal
  • Supported GNSS: GPS, GLONASS
  • Power/24 VDC
  • Whip antenna (320)

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