As different sectors adopt more technology to improve their communications and infrastructure, there is a parallel rise in cyber threats to these networks. The UK Government’s Cyber Security Breaches Survey shows that 32% of UK businesses and 22% of UK charities identified cyber security breaches or attacks in a 12-month period. Only just over a third of them have cyber security policies in place. Furthermore, the survey states that those businesses and charities reporting cyber threats typically experience more of them. In the global shipping industry, cyber threats and risks are breeding where there are gaps in systems they can exploit. In planning cyber defence strategies, shipping companies need to take a proactive approach, to ensure they can mitigate the threat from cyber-attacks. A key way of doing this, as we will explain, is through simulation.