Joint Industry Project


Offshore Operational Advisory System


OOAS is a joint industry project aiming to improve the efficiency of offshore wind farm installation and maintenance vessels, by using better data for planning and executing operations. For a typical vessel it is expected that this method will result in tens of additional working days per year. A consortium including Acta Marine, MO4, Next Ocean, Radac and SMST was formed and is led by MARIN. The OOAS project will run from Q4 2020 until the end of 2022.

Work packages

The OOAS project consists of the following work packages:
  • WP1 Development of an adaptive motion simulation model with interfaces to the gangway, DP system, anti-roll tank, ship’s loading
  • WP2 Development of a high-fidelity wave finecast method using onboard sensors, incl. validation using external reference sensors
  • WP3 Full-scale validation of adaptive motion simulations on board the OSV Acta Auriga
  • WP4 Development of the onboard operational decision support and planning tool
  • WP5 Implementation, testing and evaluation of the advisory and planning tool on board the OSV Acta Auriga
  • WP6 Project management


The project delivers a system which gives planning advice in several stages of operation, from heading and routing advice on board to workability planning one year prior to operation. The system provides advice based on a generic hydrodynamic approach, which is able to take into account the non-linear behaviour of the DP system, anti-roll tank, gangway characteristics and complex environmental conditions. Measured 2D wave spectra from the vessel and measured ship motions are used to continuously update and improve the hydrodynamic calculations and wave monitoring algorithms to deliver unprecedented accuracy in terms of operational advice.

The planning methodology is not limited to walk-to-work vessels and can be used for many other operations taking place in critical environmental conditions. The method has the potential to increase a vessel’s uptime by many days per year, without investing in costly hardware and by merely adopting a smarter way of working.

This project is made possible by the grant of Topsector Energy of the Dutch Ministry of Economic Affairs.