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NMEA Multiplexer with bidirectional SeaTalk port and USB
NMEA Multiplexer with bidirectional SeaTalk port and USB
237.99EUR
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SeaTalk NMEA Link (RS232) with galvanic isolation 100.00EUR

+ Shipping / Versandkosten

Tiny SeaTalk NMEA Bridge with galvanic isolated RS232

Read AND write data to the SeaTalk bus

SeaTalk Link

  • The easy way to bring SeaTalk instrument data to your boat computer and navigation software.
  • The easy way to send data from your navigation software to SeaTalk instruments.
  • Protects your equipment by full galvanic isolation between SeaTals and computer power
  • May pluged direct to the computers using a provided connection cable
  • Extended update function. Software may be updated by user anytime without any wiring changes.

Galvanic isolation protects your board computer and your instruments.
Galvanic isolation is especially interresting if your have different power sources for the board computer and the instruments.
I.e. the board computer can be connected to shore power, if you have different batteries for computer and instrumentation. It also protects your computer and your instruments in case the SeaTalk Nmea Link should accidently be connected with reversed polarity.
Alltogether - It simply makes the whole system more more reliable and safer.

This tiny SeaTalk NMEA Link has :

  • 1 * SeaTalk port
  • 1 * RS232 port
  • 1 * 12 Volt power supply
You simply connect this device to your SeaTalk network and to your boat-computer - using a RS232 port - and you'll get all sort of data from your SeaTalk instruments.

SeaTalk data will be translated to standard NMEA sentences, that can be used by any normal software on the pc. ( SeaClear, Fugawi, Offshore Navigator and all the others. )

Functions :
Read SeaTalk -> Send to NMEA port Read NMEA -> Send to SeaTalk

  • Depth ( $IIDBT )
  • Apparent. Wind speed. & angle ( $IIMWV )
  • Speed through water ( $IIVHW )
  • Compass heading ( $IIVHW and $IIHDM )
  • Water Temp. ( $IIMTW )
  • Trip & Total Milage( $IIVLW )
  • Position from SeaTalk GPS ( $IIRMC )
  • Time & Date from SeaTalk GPS ( $IIRMC )
  • Speed over Ground from GPS ( $IIRMC )
  • cog from SeaTalk GPS ( $IIRMC )
  • rudder angle ( $IIRSA )
  • special $STALK Sentence - shows any incomming SeaTalk datagram as a "$STALK,xx,yy,zz" sentence.
  • Wind speed
  • Wind angle
  • Speed through water
  • Compass heading
  • Trip & Total Milage
  • Position lat/lon from GPS
  • Speed over Ground from GPS
  • Cog from GPS
  • Special $STALK sentence. Allows you to send any SeaTalk datagram

NEW - now with autopilot track function New Function. We have added functions to control an autopilot.
More information in our forum ( click here )


For further Information and Manual pls. check our Project Pages HERE

The bridge comes with a printed manual, all source codes of the bridge software, compilers for the Atmel processor used on the bridge, and bootloader software.
You can look at the software and change it to whatever you want.
( Programming knowledge in C for embedded proccessors is required )


Liability cannot be accepted for any damages, personal injuries or malfunctions caused by this converter.
To make sure that the SeaTalk-NMEA-Link is what you need, please read the manual before ordering.
A manual in PDF format can be loaded HERE

Items in stock : 13
This product was added to our catalog on Sunday 28 June, 2009.
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NMEA to WiFi Adapter (network udp & tcp)

Hello, I have developed a NMEAtoWiFi adapter. [img:3e151e495f]http://dg5lm.darc.de/Bilder/IMG_7555_1.JPG[/img:3e151e495f] By using this adapter you can connect your notebook for plotting and navigation and additional devices like tablet or smartphone to your existing NMEA source at the same time. No need for cable splitting... The device can act as an accespoint or can be connected to an existing WiFi network on your boat. I have successfully tested connection to NV ChartNavigator and OpenCPN on notebook and android smartphones. Combined NMEA data (AIS & GPS) came from the Lowrance LINK-8 and were transmitted by TCP network to the NV ChartNavigator. On android tablet and android smartphone you can use the builtin UDP connection to get data from NMEAtoWiFi adapter. regards prillo[/url]

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Hi Frank, I uploaded the new versions of the config tool v1.14 and firmware V2.8. Everything works perfectly well, especially the "true wind" data are now being sent over NMEA ports. Thank you very much for this great work. Best rregards Pierre

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Ok Frank, thank you very much for this update. As you saw it on the shema of my installation on board, the multiplexer is very solicited too. So it is with pleasure that I will report to you on the operation of the multiplexer. Best regards. Pierre

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New Firmware V2.4 and new config tool V1.13

Hi Pierre - and everybody else how might be interested. I just uploaded a new package to our download section. It contains * latest Firmware V2.4 * new config tool V1.13 - With this firmware and config tool, you can configure to which port you could like to have sent true-wind data calculated by the multiplexer. - This firmware also contains some bugfixes for problems we found over the last weeks. A user from the far north :) really help us a lot to find and fix problems that could arise when the multiplexer is operated at its limits. He used all 4 Ports + SeaTalk, some ports set to 38400 Baud and others with just 4800 Baud. In this situation it could come to data corruption due to buffer overflow. - Since I don't have a NMEA wind instrument for testing, maybe you could test it give a short feedback, so that I know if it works as expected. Thank you and best regards Frank

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Ok thank you very much Frank. I will now stop scratching my head :lol: And I look forward to updating the firmware. My best regards. Pierre

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Hallo again you also asked :
Another question : could you tell me if Seatalk sentences coming up from my tiller (pilot RAYMARINE ST2000+) are processed by the multiplexer in order to have a remote control on the pilot from the chart plotter (PC using OPENCPN).
The multiplexer does receive compass data from the ST2000. I know that from the time when I tested my first SeaTalk Nmea Bridge with a ST2000+ Regarding the "remote control" - What you can do is make a waypoint ( or a route with several waypoints ) in OpenCPN and send that waypoint to the ST2000+. It will than steer the boat to that waypoint. OpenCPN sends waypoint-name, distance, direction and cross track error via NMEA to the multiplexer and the multiplexer forwards that data to the seatalk bus. The manual says :
In Track mode, the tiller pilot maintains a track between waypoints created on a navigation system. The tiller pilot computes any course changes to keep your boat on track, automatically compensating for tidal streams and leeway. To operate in Track mode, the tiller pilot must receive cross track error information from either: Bring the boat to within 0.1 nm of track. 2. Press auto. 3. Press -10 and +10 together to enter Track mode. 4. An alarm will sound and the display will alternate between: • the bearing to waypoint, and • the direction the boat will turn to take up the new track
That should work. I never tried it with a ST2000+ myself, but I tried it with other autopilots, and I'm pretty sure it will work with the ST2000+ as well. Of course you have to make sure, that "sending data to seatalk" is enabled. ( See config tool ) Best regards Frank

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Perfect !! That's the kind of problem that would have been relay hard to find from here. I'm glad you could sove it. Best regards Frank

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Re: Wifi connection

Hello Pierre,
...... Everything works fine except that I can not get the true wind using Wifi while I get it using the USB plug.
I just checked my source codes - and you are absolutely right. Currently the muxer calculates true wind and sends it to the USB port only. I guess that comes from the time when I implemented that true-wind calculation for one user who asked for it, and I simply forgot to finish that new function properly. Most users only needed true wind on the board computer, which is connected via USB port. I will add sending true wind to the NMEA-Out ports as well. I just need a couple of days to implement and test it. Thank you for reporting that. Best regards Frank

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Wifi connection (New Firmware V2.4, new Functions & Bug

Hi Frank, As you probably remember, I use your gadgetpool multiplexer on my boat. It works perfectly well. I use OpenCpn on a PC as a chart plotter and I decided this year to connect the PC using Wifi on to the multiplexer. So I added a Wifi access point to my installation. http://www.usriot.com/p/serial-wifi-ethernet-converter/ Everything works fine except that I can not get the true wind using Wifi while I get it using the USB plug. Do you have an idea on why I have the true wind via the USB and not via Wifi ? NMEA sentences seems to be correct : $IIMWV,112.50,T,005.30,N,A*3A $IIMWV,112.5,R,005.3,N,A*3C The relative wind is displayed both by USB and Wifi. Connections of the whole stuff is as follow : https://www.dropbox.com/s/szgbg2a4nt2f5vu/Liberdade_reseau_5_GB.pdf?dl=0 Best regards Pierre

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Problème USB link

Hi Frank, I found the problem ! On the St wind, on one Seatalk connector the 12V from the instrument was out or order. I take the 12V on an another connector and everything is ok! Thank's for help. Regards. Patrick

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