In January 2021, new International Maritime Organization (IMO) guidelines on maritime cyber risk management went into effect. Around the same time, the U.S. government released a first of its kind National Maritime Cyber Security Plan (NMCP), accompanying recent maritime cybersecurity directives from the US Coast Guard. IMO 2021 called for more detailed guidelines from maritime NGOs and [IMO] member governments. A profusion of new guidelines poured forth from an alphabet soup of organizations, including the International Maritime Council, International Chamber of Shipping and International Union of Marine Insurance.
Source: https://www.helpnetsecurity.com/2021/05/12/maritime-cybersecurity/