This online course examines the definition of Cyber Security, the threats that exist, the weaknesses onboard that can be exploited - and then the Cyber Security measures that can be taken to mitigate and defend against these types of threats. This course is designed to provide the user with a firm grounding in Maritime Cyber Security issues and to encourage the understanding amongst all individuals in an organisation, because 'Cyber Security is everyone's responsibility'. The number one learning point to be taken away from this course is that however strong an organisation's Cyber Defences are: People are the strongest line of defence ... or the weakest link. It takes only one person to make the wrong choice and the whole organisation can be compromised in a matter of seconds. Therefore, it is in an organisation's interests to train and retrain their employees to be aware of Cyber Security, to take it very seriously, to take an active interest in learning as much as they can about Cyber Security threats and defences, and to be constantly on guard.