Seapath 130

Position, attitude, time and heading sensor

The Seapath 130 series is developed specifically for hydrographic surveying where high precision heading, position, roll, pitch, heave and timing are critical measurements. The product combines state-of-the-art dual frequency GNSS receivers, inertial technology and processing algorithms in a compact and portable package.


  • Subsea
  • Surface
  • Offshore
  • GNSS receiver
  • Inertial measurement unit (IMU)
  • GNSS infrastructure
  • Sensor fusion
  • Inertial measurement unit

Precision and Integration

The main component is the Sensor Unit with the integrated GNSS antennas and receivers. The Sensor Unit mounts on top of the vessel mast or a pole. On top of the transducer the inertial sensor of type MRU 3, H, 5, and 5+ is mounted within a lightweight subsea housing. The Seapath operator software is installed on a connected PC for configuration and monitoring. All the components are connected through a spider cable with MRU connection, three configurable output serial lines, DGNSS correction input, 1PPS output, network communication, and power.

Advanced Capabilities

The Seapath 130 series is delivered in a range that includes the Seapath 130-3, 130-H, 130-5, and 130-5+ models, each providing varying levels of roll, pitch, and heading accuracy. The advanced Seapath navigation algorithms integrate RTK GNSS data with the inertial sensor data from the MRU, offering unique advantages over stand-alone RTK products. This integration allows for accurate positioning, with all data from Seapath having the same timestamp and real-time output.

Innovative Software Enhancements

The latest Seapath software includes Automatic Online Calibration (AOC) that significantly improves the roll and pitch accuracy. With the AOC functionality recalibration of the IMU is no longer required if the vessel is in motion with heading changes. The product supports various types of differential corrections and provides all data with precise time stamps and the ability to log raw satellite and IMU data.

Key features

  • Compact and robust integrated INS/GNSS system
  • Accuracy in roll, pitch, and heave measurements during turns
  • Real-time heave output for periods up to 25 seconds
  • Precise heave at long wave periods by using the PFreeHeavePC algorithms
  • 550-channel dual frequency GPS/GLONASS/Galileo/Beidou receiver
  • Robust against GNSS dropouts
  • Multiple differential correction support including SBAS
  • Outputs on RS232, RS422, and Ethernet
  • Up to 100 Hz data output rate
  • Meets IHO special order requirements


Data sheet

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