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SeaTalk NMEA Bridge 32 (Basic Line) without Display 119.00EUR

+ Shipping / Versandkosten

This is just our "baseLine" version. Please note that there's a product with extended functions availiable.

Click here to go to the new product pages


This product contains the for the last years established and proven technology. Please note that we do offer this product for the bargain hunter. We'll not change any functions or add features in this product ( except bugfixes ) in the future.
The SeaTalk <-> NMEA Bridge is a single chip computer, that translates information between SeaTalk and NMEA.
It can read & write NMEA and read & write SeaTalk data.


The bridge is also available with an LCD-display ( check our store ).
The repeater has 1 SeaTalk bus connector and 1 serial port for NMEA or PC connection


  • ATmega32 Processor
  • 1 * SeaTalk Port ( read & write SeaTalk )
  • 1 * NMEA Port ( RS232 & RS422 )
  • On board volatage regulator
  • Boot loader (to update to new Software Versions)
  • comes with printed manual and CD with all source codes, compiler,boot loader software

Here is a simple example on what you can do with the SeaTalk NMEA Bridge Connect your SeaTalk Instruments to your NMEA Network

click on the picture to get a bigger picture

  • Get data from your SeaTalk instruments to NMEA devices or to your computer
    If you have a Raymarine St60 Tridata, a ST40 Wind Instrument or other SeaTalk devices, you can let the SeaTalk NMEA Bridge translate Information from SeaTalk to NMEA.
    With this function a navigation notebook or a chartplotter can now display wind direction, wind speed, water depth, speed over water and much more.
  • Send Data from your NMEA Devices to SeaTalk Instrumens.
    The speed over water function of a ST60 tridata needs to be adjusted.
    The paddle wheels are different, waterflow arround different types of boat hulls are different - therfore your log need propper adjustent in order to display a correct speed over water.
    With the SeaTalk Nmea Bridge, you can send speed information from your NMEA GPS to the SeaTalk Instrument. This makes adjustment accurate, easy, fast.

These are just two verry simple examples. With the SeaTalk NMEA Bridge you will many functions and features that haven't been possible before.

Additionally to the standard SeaTalk -> NMEA conversion, the bridge software offers a new - NMEA like - command $STALK.
With the command $STALK,xx,yy,zz the PC can send any SeaTalk command you like. Your PC just sends a simple text string, and the bridge handels the spezial 9-bit protocoll, the collision detection and the electrical connection to the SeaTalk bus. ( Either with your own software or with a standard terminal programm )
With this new command a normal pc or notebook can send any SeaTalk command and so it can control or manage SeaTalk devices. ( Example : Switch Illumination of SeaTalk instrument on/off, Change Display units from mph to knots and and and )
This special function is also available the other way arround.
The bridge can send every SeaTalk datagram as a $STALK,xx,yy,zz string to the PC.
This simple text string can be read and computed by the pc and so we can read information from the SeaTalk Bus, that have no corresponding NMEA sentence. ( Example : see above )

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 )


The protocol converter is a research project

It is used for research on data communication, computer communication and data conversion with computers and instruments on board of boats.
It is just a navigation aid. For navigation allway use paper charts, compass, GPS etc. Never rely on data from this instrument.
Liability cannot be accepted for any damages, personal injuries or malfunctions caused by this converter.
To make sure that the SeaTalk-NMEA-Bridge is what you need, please read the manual before ordering.
A manual in PDF format can be loaded HERE
An overview of the operation modes and configuration can be loaded HERE

Available Options:
Model:
Items in stock : 8
This product was added to our catalog on Monday 01 May, 2006.
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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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