Siport21 has significantly strengthened its advanced training offering with the introduction of full RotorTug® simulation capabilities at its Maritime Simulation Center, developed in close collaboration with KOTUG. The upgrade is powered by Kongsberg Maritime’s K-Sim® platform and includes the installation of a third azimuth thruster control on the real-time ship simulation bridges.

This enhancement enables highly realistic modelling and manoeuvring of RotorTug-type vessels — characterised by their unique triangular propulsion configuration with two forward azimuthing thrusters and one aft. Designed for superior manoeuvrability, high redundancy and strong indirect towing performance, RotorTugs represent one of the most advanced tug designs in modern towage operations.

The new simulation capability is the result of extensive technical development by Siport21’s team of naval engineers and 3D modelling specialists, supported by operational input from KOTUG. By combining Kongsberg’s validated numerical models with detailed hydrodynamic characterisation and real-world operational insight, the Centre now offers a high-fidelity environment that closely reflects the behaviour of three-azimuth RotorTugs in demanding scenarios, including escort operations, confined-space manoeuvres and indirect towing.

To ensure operational accuracy, the RotorTug model underwent a rigorous validation programme led by an experienced KOTUG tug master and trainer. This process included structured testing across multiple operational profiles, with direct feedback used to fine-tune vessel response, handling characteristics and force application. The result is a simulation model that reliably mirrors real-life RotorTug behaviour.

“With this upgrade, we are setting a new benchmark for RotorTug training realism,” said Raul Redondo, Manoeuvring and Nautical Studies Director at Siport21. “The involvement of KOTUG’s operational experts was key in achieving a simulation environment that reflects the complexity and precision required in day-to-day tug operations.”

The RotorTug simulation module is now available for advanced tug master training, operational assessments and demonstrations, enabling crews and operators to safely develop skills, test procedures and explore vessel performance in a controlled, virtual environment.