Seapath 130-R

Position, attitude, time and heading sensor

The Seapath 130-R 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. The MGC functions both as an IMU in the Seapath 130-R series and as a stand-alone INS system.


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

High-Performance Components and Interfaces

The main component is the Sensor Unit with the integrated GNSS antennas and receivers, optimally mounted on top of the vessel mast or pole. For rigorous underwater environments, the 50-metre rated subsea INS system, the MGC R2 or R3, is housed atop the transducer. The system boasts three configurable RS-232/422 serial lines and eight Ethernet ports for comprehensive output options. Seapath’s operator software allows for streamlined configuration and monitoring, facilitated by a spider cable that links all components and ensures efficient power and network communication.

Advanced Functionality for Optimal Navigation

Seapath 130-R takes advantage of the advanced navigation algorithms that fuse RTK GNSS data with inertial data from the MGC. The superiority of the Seapath over stand-alone RTK products lies within its high precision roll, pitch, and heading outputs, allowing for precise vessel reference points. Real-time data output, stamped with meticulous timing, supports subdecimetre position accuracy. Post-processing capabilities further enhance this precision, offering a formidable solution for the most demanding survey operations.

Unique Solution for Demanding Hydrographic Applications

Through the integration of state-of-the-art software features, such as the Automatic Online Calibration, Seapath 130-R assures enhanced roll and pitch accuracy without the need for recalibration during motion. Offering corrections from standard DGNSS to XP2/G2/G4/G4+ and RTK, the Seapath stands as a bespoke solution for hydrographic surveying and dredging operations that demand premium accuracy. This practicality is boosted with no degradation in accuracy during tight maneuvers, catering to the comprehensive data requirements of the industry.

Key features

  • 0.05° to 0.06° heading accuracy depending on MGC model
  • 0.007°
  • 0.01° roll and pitch accuracy
  • No accuracy degradation in roll, pitch, and heave measurements during turns
  • 5 cm real-time heave output for periods up to 25 seconds
  • Precise heave at long wave periods by use of the PFreeHeavePC wPiCth f oSre caopnafithg uHrMatIi oswn algorithims
  • 550-channel dual-frequency GPS/GLONASS/Galileo/Beidou receiver
  • Robust against GNSS dropouts due to the INS system being part of the product
  • Multiple differential correction support including SBAS, RTK correction on RTCM format, SeaSTAR, OmniSTAR, and Marinestar corrections supported
  • Outputs on RS232, RS422, and Ethernet
  • Up to 100 Hz data output rate
  • Dual-frequency GNSS ionospheric compensation
  • Logging of raw satellite and IMU data possible
  • Meets IHO special order requirements


Data sheet

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