An existing ICT system (hereafter called Legacy System) owned by a stakeholder and used for maritime surveillance can hold information that could be exchanged through CISE. The stakeholder uses an Adaptor to translate the specific formats and communication protocols used by the Legacy System, to the CISE data and service model, in order to connect its Legacy System to a CISE Node. Through the CISE Node, information can be shared with other CISE Nodes in the CISE network. The CISE Node is a common software component for all the partners connected to the network, but the management is not centralised. CISE is based on a decentralized architecture with a point-to-point exchange of information which allows the stakeholder to be confident about data access and control.