Nigel Calder wrote 3 very interesting articles about what he call the “3-wire” boat (as well as Ben’s April 2006 Article in PMY), in which one controls AC and DC circuit breakers distibuted around the boat via a N2K bus. I too think the possibilities of the SIM, RIM, and TIM (Temperature) added with the ACM and DCM (which uses a coil not a shunt) really begin to show the great features of impressive and expansive N2K networks. Again, at the moment the only monitoring display system that will definitely work with the SIM is N2KView, but the messages are standard, and therefore aren’t the possibilities unlimited? As you’ll see, Maretron is even providing optional smoke/heat, high bilge, and motion sensors, though the SIM will purportedly mind up to six switches of most any sort, and in some cases will even know if the underlying circuit is functional. The SIM100, or Switch Indicator Module, is related and possibly even more powerful. I’m being quite hypothetical here-heck, I’m not even sure Maretron’s own displays understand circuit run state PGNs yet-but I believe it’s just a matter of programming. A Garmin GMI 10 or Raymarine ST70 could conceivably do the sort of detailed bilge pump cycle analysis we saw in the Blue Sea VSM 422.
Hence one RIM100–which retails for $299–could mind, say, three nav lights, two bilge pumps, and one engine room blower, and could prompt related info and alarms on any networked screen that’s programmed to display them.
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