Originally Posted by BobH
In NEMA 183 a talker (source) can connect to multiple listeners (receivers). You cannot connect multiple talkers together.
Well not directly. But you can if you use a multiplexor. I've just installed an Actisense NDC-4.
Actisense NDC-4. Fully isolated NMEA Data Multiplexer/Combiner > Introduction
I'm feeding Furuno GPS and Sounder (both talkers) into Odyssey Time Zero on a PC (with a nice 24" screen) via a USB port. The Furuno radar and Sounder also listen to the GPS to get lat/long displayed on their screens.
For my flybridge I've added a Simrad NSS 8 MFD (also has built-in GPS), which is about to get an AIS along with a Simrad Autopilot system added via Simnet which is NMEA 2000. I'll feed the NSS 8's NMEA 0183 output (talk) and input (listen) to the Actisense to get AIS data down to the PC, and the Sounder's depth/water temp back up to the NSS. With 2 GPS's in this system, priority is assigned to one or the other in the Actisense setup.
The only thing I wont have on the flybridge is radar display. But the NSS 8 can take a Simrad radar scanner as input (via interface box). At present I'm thinking if I need radar I probably don't want to be up on the flybridge.