What Annex 1 names
In the water subsector are managers of ports, including their port facilities, and entities that manage works and equipment in ports, and also operators of vessel traffic services [1]. For the concept of port, the annex refers to the European port security directive: an area with works and facilities for commercial transport by sea [6].
Size decides
A company from Annex 1 above the threshold for medium-sized enterprises is essential [2], a medium-sized company is important [3]. Smaller port companies are as a rule not covered. A port company that was designated as a provider of an essential service under the Wet beveiliging netwerk- en informatiesystemen (Wbni, the previous Dutch network and information systems security act) before 16 January 2023 can be designated by the Minister as an essential entity [7].
For size, it does not count that governments together control 25% or more of the capital or the voting rights. Under the SME definition such an undertaking is as a rule not an SME [10], but that rule does not apply to the Cbw [8] [9]. For a port or rail company in government hands too, the number of persons employed, the turnover and the balance sheet total therefore decide.
When an incident is significant
For transport by water, the regulation of the Minister of Infrastructure and Water Management names, among other things: transshipment in the port unavailable for twelve hours or longer, or access to the port and nautical services unavailable for twelve hours or longer [4]. Planned maintenance interruptions do not count [5].
What you do now
Find out which systems control your cranes, gate processes and terminal operating systems. They fall under the duty of care and belong in your inventory and risk analysis. See also the question about control systems and automation.