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Each NMEA circuit can have only ONE talker. NMEA 0185 is too simple and talkers are too stupid to listen before they start sending data to listeners....unfortunately.

As you only have ONE talkeron your circuit, it's fine the way it is. You only need a multiplexer if you have to have more than one talker talking simultaneously. What the multiplexer does is to store all the talkers' data fromseveral talkers (ours has 4 inputs), then send out each NMEA statement, in rotation, to all the listeners connected to
its output. This keeps the multiple talkers from crashing into each other. In our4 port multiplexer you get: DATA 1 THEN DATA 2 THEN DATA3 THEN DATA4 THEN DATA 1 and it keeps repeating as long as its on. The listeners are bombarded with statements from them all continuously, but"in line".

Now there's something else to think about. What if one of my talkers is a Garmin 185 GPS sending out GPS data.....and my Raymarine radar/chart plotter's separate WAAS-GPS receiver tosteer the chart plugs in the radar is ALSO sending out CONFLICTING GPS information. It's much more accurate than the Garmin is uncompensated with its
satellite-corrected WAAS receiver. What would happenif this data went to The Cap'n? We'd get TWO plots? No plots? What about sending data to the autopilot? We're installing a B&G 1000h Pilot with electric actuator to the rudder. What happens if itgets CONFLICTING data? I'm sure it would go CRAZY trying to steer the boat to two
points at once. Sound reasonable? So we need to be able to turn off data to the input ports, or configure the varioustalkers to not send out ALL the statements they can generate.

So, this is going to take some programming thought on all the instruments talking to the network. It's not just plug 'n pray.

We'vedecided, normally, the WAAS-GPS and chart plotter in the Raymarine color radar/chart plotter with the chart plugs in it will be the primary source of GPS information all around. As we also have B&G...