Not sure what regulation you're talking about; the only existing standards in this space are either proprietary to one manufacturer (e.g Raymarine's Seatalk), o

Not sure what regulation you're talking about; the only existing standards in this space are either proprietary to one manufacturer (e.g Raymarine's Seatalk), or just industry consensus (e.g NMEA). There's no regulation enforcing the use of either except market forces. I know for a fact that security has been a big consideration in SignalK's development, but at its core SignalK is only a JSON schema; I don't see why military ships couldn't pick this up if they were so inclined. For now, it has basically become the standard in the open-source marine ecosystem; used by default in OpenPlotter (a marine-oriented Linux distribution) and supported in OpenCPN (a chartplotter/navigation software).