Do I need an nmea multiplexer?

[Rowglide]

Here is my setup...
NSS8 with 3G radar,
Raymarine ST60+ wired in using NMEA from ST60+ graphic display
This is run through the data / video connector on the NSS8 unit.

I would like to fully integrate my Standard Horizon GX5500 VHF and require a GPS signal via NMEA.... where would I take this signal from?

Do I require a multiplexer to accomplish this?

Thanks

[jamhass]

Don't have your exact setup, but normally a single NMEA output can be "simply" connected to a few (3-ish) separate input devices. So, use a nice terminal block, connect your NMEA/GPS output to it and jumper your SH input to it. Take care to properly connect data + and Data Grounds correctly, and set proper baud rates.

If you have multiple NMEA outputs from multiple devices, then you will need a multiplexer.

[Rowglide]

I thought about that but the radio has both input and output (Will locate a received distress signal on chartplotter for example).
I have a second NSS8 in the cockpit... wire might be long but I suppose I could use the in/out from that unit.

[jamhass]

You can connect the output of the VHF to both chart plotters just fine, as long as the Inputs of the GPS units have no other connections to them. If the GPS has more than one input, just connect to a free one.
Similarly, if the VHF has a free input, just connect the output of the GPS there.

Don't know your VHF, but many SH units have multiple NMEA inputs and output.

\You will likely need to set the baud rates etc, for each port on each unit.