DARPS 232 is a DP position reference system tailor made for offshore loading operations. The DARPS system combines high performance sensors for reliable and accurate absolute and relative positioning of two vessels such as a shuttle tanker and a FPSO/FSU.

Enhanced Positioning Capabilities

DARPS 232 is a GPS/GLONASS based system which uses simultaneously gathered GPS/GLONASS data from high performance sensors on remote and own vessel to compute distance to target (DT) and bearing to target (BT). The system is capable of providing relative position with a worldwide accuracy of 20 cm and is independent of differential correction data. For computation of absolute position, differential corrections are used achieving a global accuracy of 20 cm in High Precision mode utilising commercial subscription services. Moreover, the DARPS system also utilizes free-to-air SBAS correction signals like WAAS, EGNOS, and MSAS, available at no additional cost.

Communication and Compensation

Data between the two DARPS systems is communicated by UHF high performance transceivers operating in multiple bands. The use of a TDMA protocol enables efficient two-way communication, providing flexibility and reliability even in areas with dense radio activity. Additionally, the system includes a built-in lever arm compensation feature, which allows for the selection of numerous measurement points across the vessel to correct loading and offloading points on both the shuttle tanker and the FPSO/FSU. This feature relies on heading input to ensure accurate distance calculations during relative position mode operation.

Operational Excellence and Diagnostics

A new operator software has been developed alongside DP operators for the next-generation DARPS system, enabling real-time situational awareness and quick, effective responses to critical situations. For maintenance and troubleshooting, DARPS offers graphical views for simple on-board system diagnostics. System data are automatically logged, and an export tool is provided for easy data transfer to USB media. A verification tool also exists for the DARPS UHF radios to reduce the risk of costly downtime by confirming system correctness prior to offshore operations.

Key features

  • Combined GPS L1/L2, GLONASS L1/L2, and SBAS receiver
  • Multiple differential correction support
  • High-precision absolute and relative position
  • Real-time compensation of errors introduced by high ionospheric activity
  • Ease-of-use HMI tailored to safety-critical DP operations
  • Lever arm compensation
  • Can be controlled through a DP system during offshore loading
  • Extended interfacing capabilities
  • Multiple UHF links ensure reliable and safe operations
  • Automatic data recording functionality
  • GNSS heading for gyro monitoring
  • HW upgradable to support Galileo and Beidou


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