Summary
"The close proximity navigation system to be developed in EGNSS H2H will be a safety system, and components will have to adhere to requirements for functional safety in order to have freedom from unacceptable risk of harm to humans, property or the environment. Since the data exchange between vessels, and between vessels and shore stations, is an integral part of the safe navigation system, the communication system must be considered an essential part of the safety system. The objective of this task is thus to define and develop a safe (and secure) communication protocol. However, the maritime domain does not currently have regulations or standards for safe communication, so the proposed solution will be based on the end-to-end architecture as defined in EN 50159 for railway signalling. According to this safety standard, the underlying communication protocol can be considered as a ""black channel"", with added security and safety layers in each end node, as illustrated in the figure below. The safety and security layers must be developed according to functional safety requirements for hardware and software, e.g. as a safety-instrumented system
(SIS) as described in IEC 61508, while there are no formal safety requirements for the ""black channel"" communication protocol."
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