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NMEA Multiplexer with bidirectional SeaTalk port and USB
NMEA Multiplexer with bidirectional SeaTalk port and USB
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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:
Items in stock : 10
This product was added to our catalog on Monday 01 May, 2006.
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Hallo Herr Wallenwein, Danke für Ihre Antwort. Nein, leider habe ich QT nicht installiert. Ich würde mich trotzdem sehr freuen, wenn es klappen könnte. Schon jetzt bin ich sehr glücklich mit der Kombination Muxer und Raspi. Per ser2net gibt er die seriellen Muxer-Daten auf einen TCP-Port aus und funktioniert gleichzeitig als WIFI-AP. So habe ich GPS, Tridata, Wind und AIS (vom Funkgerät) z.B. in OpenCPN kabellos verfügbar. Die Übertragung läuft absolut stabil. Wenn ich jetzt noch per RDC das Configtool benutzen könnte, wäre das die Krönung... Danke für Ihre Mühe und Gruß, Harm Meiners


Hi Frank, I would be happy with the NMEA sentence being editable - then you can enter in whatever string I want to trigger the alarm. I believe these AIS beacons transmit AIS messages 1 (position) and 14 (safety related) when activated so in my case I would look for a message 14. For resetting the alarm I was thinking a timer that you can adjust could suffice but an acknowledge line would be even better. Best Regards Ian


Did you receive the E-Mail I sent ? I didn't get a reply and therefore I can't help. Best regards Frank


Hallo Herr Meiners, das das Config tool nicht einfach so auf dem Raspi läuft, das wundert mich nicht. Es ist für X86 Prozessoren compiliert und der Raspi hat einen ARM Prozessor. Man kann das Tool auf dem Raspi compilieren. Ich habe noch ein Raspi Model 2, aber die Compilerumgebung und QT habe ich darauf noch nicht installiert. Haben Sie zufällig die QT Entwicklungsumgebung auf Ihrem Raspi installiert ? Wenn nicht kann ich das mal tun - dauert aber noch etwas. Gruss Frank Wallenwein


Hello Ian, good Idea. Here are my first thoughts. We already have something similar - our SeaNet Alarm. [url=]See HERE [/url] This device has am BTS 442 automotive mosfet switch to switch on/off the alarm horn / light. This device is built to listen to SeaTalk messages instead of NMEA messages. I have to check, if the circuit could be modified to be able to listen to NMEA messages as well. Otherwise we could, of course, modify the muxer firmware to identify an AIS MOB Signal. ( I'll have to check what a AIS MOB sentence looks like ) I guess we also need an acknowledge button to switch off the alarm horn ? Best regards Frank


MOB Alarm Output Feature

Hi, We recently purchased an Ocean Signal personal AIS beacon which attaches to the lifejacket and emits an AIS MOB signal when activated. I have an AIS receiver which receives this AIS MOB signal and this is connected to the NMEA Multiplexer and then to the chartplotter. We often do overnight passages where one of us sleeps while the other is on watch. I would like to modify the NMEA Multiplexer so that when it reads an AIS MOB message it operates a loud external alarm to wake the sleeping crew. I'm an electronics engineer and feel confident of being able to interface the alarm to the microprocessor but I'm not so confident with modifying the firmware to read the AIS MOB message and operate an I/O line. I would be grateful if the firmware was modified to add this feature. The NMEA message that causes the alarm could possibly be editable so that it appeals to more people by being able to be triggered by other NMEA messages. Thanks Ian


ConfigTool auf Raspberry Pi

Hallo Herr Wallenwein, ich nutze einen Raspberry Pi (B+ V1.2), um die Daten des Muxers per WIFI an mein Tablet zu senden. Gerne würde ich auch das ConfigTool auf dem Raspberry (Rasbian) ausführen können, was mir aber nicht gelingt (weder 32- noch 64-bit). Können Sie mir da helfen? Vielen Dank und herzliche Grüße, Harm Meiners


Hello Juan, I am interested by your App on Androïd. Do you have now some picts of the Display on tablet or phone, pricing ? Also your hardware to convert Seatalk datagrams to RS232 is it available ? (I understand that you are not using a gadgetPool converter) Thanks for your help. Best Regards, Jean *************************************************** Verfasst am: Di Mai 06, 2014 3:07 am Titel: Antworten mit Zitat Helo Frank: Thanks for your quick response. As soon as possible I’ll put a brief description of the App with images of displays. I don’t have yet any customer. Only one (my friend) and I worked free for him. My intention is to obtain some profit selling this app worldwide for Internet. As I said in my first post, I’m not interested in selling hardware, for avoid the difficulties inherent to commercialization. The business model of selling software is easier (for me). I don’t think the open source is good for me as a business model. If I give free my work everybody ¿ how can obtain any return?. Or if I sell the first App with open source, I`ll not sell any more, even worse, other people would obtain profit selling my work as theirs. The App is only a prototype. I’ll need some time to finish it, and in order to sell it, develop a web site for that. My question for you is if you might be interested in selling my app in your web (when completely finished). I think in a commercial model like Sea Plotter. People can download free the App for test in a period of time, and if satisficed completely, pay for a license. Best regards Juan


Hi Frank, First of all, many thanks for your reply ! Yes, I can believe that it would be useful to many users of Autohelm/Raymarine Course Computers which are SeaTalk1 (old or not so old) compliant only. There are many users worldwide of ST6000/7000, Type 100/300 and S1/S2/S3 CC. Please, let me explain further : As you are aware of, SeaTalkNG (NMEA2000) is the main standard today for marine network instruments and autopilot Raymarine communications. SeaTalkNG is embedding Seatalk1 wiring but does not support all SeaTalk1 functions. Nomore Seatalk1 products are manufactured nor supported today. As a main example, a SeaTalk1 Course Computer can be controlled/displayed by a new SeaTalkNG Control Unit (as the Raymarine P70 or ST70) but only for the +/-10, +/-1, Auto Standby and Track functions, exactly as a 128SD Bridge can do it. Commission is necessary not only at the first time but : Calibration process of the CC or parameter change is needed each time something is to be replaced or repaired on the boat, i.e. new compass fluxgate or compass fitted on an other place, CC itself, Control Unit, rudder or wheel system, mechanic/hydraulic and so on... Also when the boat itself is changed ! To enter the calibration process (compass linearization, alignment and initial settings) or to change the settings during navigation (rudder amount, sensitivity level...), the user needs a fully Seatalk1 compliant Control Unit as the ST6000/7000, ST6000+/7000+, ST6001, ST6002, ST8001/ST8002 - or a well known ST600R Remote Control. As the above SeaTalk1 Control Units are becoming very rare on the second hand market and as the new SeatalkNG ones do not support the Seatalk1 calibration process, the user is forced to abandon all electronic components of his autopilot on the shelf and to buy a new one. Very expensive ! The Bridge 128SD could be used as it is like a SeaTalk1 Control Unit but unfortunately not like a ST600R remote because of the lack of calibration. I can send you a Type 100/300 CC mother board or a ST4000+ Autopilot for testing purpose, no problem. Thanks for the C source code. I am afraid that it will take a lot of time for me to re-learn the C compiler and linker... For sure you will be more efficient than me. Please let me know your understanding and aim about. Best regards, Jean


Hello Jean-Luc,
Do you plan to implement calibration functions in a next software release ?
well - currently I have not planned to add this calibration functions. Do you think there is a demand for having this special calibration function in the SeaTalk Nmea Bridge. I thought this settings are only made on commission of the autopilot, and I personally would prefer to make that directly on the autopilot. Well - could be I'm wrong. If you see a demand for implementing it into the Bridge, I could try to do it. I don't have an autopilot available, so I would need someone to test it and give feedback. If you would like to change the software yourself - I'l I can send you the sources. Best regards Frank


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