Abstract
This paper presents a digital twin of the research vessel R/V Gunnerus using the Open Simulation Platform (OSP) to predict seakeeping capabilities and structural responses during operation. A model is developed, integrating live vessel- and environmental data to give decision-making support with regards to motions and structural loads in real-time. To enable two-way data exchange, an MQTT-based communication solution has been developed, allowing the vessel model to both receive and provide data to connected systems. The approach demonstrates the potential of OSP for enhancing operational awareness and decision-making support in marine operations, while showcasing the benefits of modular, standards-based simulation architectures in maritime applications.