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SeaTalk NMEA Bridge128SD without display with USB
SeaTalk NMEA Bridge128SD without display with 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 : 4
This product was added to our catalog on Monday 01 May, 2006.
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Hello Frederick, thank you for your feedback. I'm glad to hear it is working so far. Regarding USB. Well, we do have a SeaTalk Link USB and a SeaTalk Link RS232. Users who want to connect the link to a computer usually choose the USB Version. Users who want to connect a GPS (NMEA) to the Link usually use the RS232 Version. There is no way to use a USB<->RS232 adapter AND and use this adapter to power the SeaTalk-RS232 link from this adapter. USB provides maximum 5 Volt; the RS232 Link is made to work with 12 Volt boat power. The RS232 has an extra a build in 12V to 5V voltage regulator. This voltage regulator need more than 5 Volt to work. The RS232 has a RS232 interface chip; the USB Version has a USB interface chip. These two are totally different. The USB chip can only work with USB, the RS232 chip can only work with RS232. Absolutely incompatible. :-( What you could do is : Get a USB<->RS232 adapter. There are lots of different types of this adapters available. I'm sure you can get it from just about any local computer store, Walmart, Radio Shack or Amazon. What you need to do than, is to make some connections from the USB-RS232 adapter to the SeaTalk Link. Power supply could come from the SeaTalk bus. SeaTalk provides +12 V and GND. Just tell me if you would like to do this - I'll send you a more detailes connection diagram. Best regards Frank


Seatalk 1 does send fluxgate heading data

Frank, Finally, I was able to test my Seatalk instruments with Seatalk Link w/galvanic protection and RS232 connection, and found that some wires had fallen out of my autopilot, so now heading data is being sent through to Opencpn. Additionally I find that the B&G 4G Radar does now do Chart overlay due to the heading data being recieved, however it is a little slow to move, but it is very usable. Marpa is not possible as this is a slow Raytheon fluxgate Z#140 I believe. I am finding that I would like to change the Seatalk Link to be a direct USB interface. Is there a way of wiring this up by removing the 4-wire connection and serial cable and separate 12vdc power wires, and getting a new 4 wire connector to secure a USB cable? Thank you its a wonderful device!


Re: Installation der neuen Bridge 128SD

Hallo Leute, ich will euch kurz teilhaben lassen, was ich da so mit dieser Bridge mache.
Danke !
Teil 2 folgt dann mal in Kürze. Michael, SY OPHIGAS
Ich bin gespannt.
Seit dem Umstellen via Tasten auf USB 4800 zeigt die Software immer USB 1200 an, funktioniert aber mit 4800.
Die Probleme / Fragen mit Parametern die nicht gespeichert werden, schaue ich mir nochmal an. Das Config Programm schreibt jede Änderung gleich raus an die Bridge und die speichert die Änderung in Ihrem EEprom ab. So soll es sein. Wenn es nicht so ist - ist das seltsam. Schaue ich mir nochmal detailliert an. Danke schon mal für den Bericht. Gruss Frank Wallenwein


I should also advise that I have the RI10 radar interface box and have installed the simnet to n2k cable from the RI10. Connecting NMEA0183 from page 31 of the manual shows wiring for serial balenced output and wiring for single ended output. Do not know which to use. It says single ended is for RS232 so I guess i use that. B&G video + nmea cable wiring: Orange= RX_grnd TX_grnd Green= Rx. Tx These are nmea0183 talker Blue = Tx_gnd Rx_gnd Yellow = Tx Rx These are nmea 0183 listener I don't know how these wires would connect to the ST Link wires yet. The manual says I can also connect the pc as a listener only otherwise there is a chance of the two devices outputting. I have about 8' of wire from my instruments to the B&G video cable. I could use seatalk wire, but that only is 3 wires, but it looks like the RS232 signal only uses 3 wires, brown, black and blue. So will that size wire be acceptable? About 22 gauge. Perhaps I should get the Raymarine kit for ST to N2k and keep these nmea0183 wires for connecting the computer? Thanks Rick


Hi Frank, I have just completed installation of B&G Zeus Touch and B&G 4G Radar. I am trying to connect my ST Link galv isolated with RS 242 and 12vdc power to the Zeus Touch video + nmea0183 wires. Can this be done? I am trying to see if the heading data will allow me to orient the tadar image and thus allow radar overlay on the charts. Also would like instr data on the b&g for sailsteer.. Current connections to the ST Link. ST1 = bare, yellow, red looking down on connection with straight head up. RS232 = brown, black, blue comm wires, 12vdc power also connected. 12vdc power wires = black same as brown, red to separate last connection. Can I wire the 4 connector side up to the B&G nmea in and out? How? Should I still power it wirh separate 12vdc as before? What fuse size? I suppose it must be a dedicated connection to B&G nmea0183 and I cannot moniter with computer. I was not finding heading info in the data stream. I have removed old radar and fixed some bad connections, but have not tested again. I was going to wire it up and see if the B&G picked up heading and other instruments. What do you suggest? I could go get a Raymarine ST converter to N2k and use thevST Link for computer and troubleshooting... Thanks Rick


Installation der neuen Bridge 128SD

Hallo Leute, ich will euch kurz teilhaben lassen, was ich da so mit dieser Bridge mache. Mein Boot liegt seit Wochen gekrant (Motor ausgebaut) in der Marina. Daher habe ich ein wenig Zeit. Mein Raymarine RL80C Plotter lügte, denn es behauptet, dass es alle ST (seatalk) Daten auf NMEA183 konvertiert und auf NMEA183 ausgeben kann. Das stimmte von Anfang an nicht, es werden nur basic GPS Daten ausgegeben. Den Plotter brauche ich leider noch, denn das ist mein Radar. Der Raymarine NMEA out geht über einen Actisense NDC4 NMEA Muxer u.a. and das PC Programm MAXSea. Der Muxer liefert weier als INPUT AIS Daten und gibt GPS Daten an diverse Geräte (enavtex,2. Funke etc) Ich verwende Maxsea als Navi Programm: [url][/url] Nachdem ich jetzt einen neuen Plotter (Simrad NSS EVO2 - Touch) für aussen gekauft habe, for allem wg des forwardscanners, will ich natürlich auch die RAY Daten am SIMRAD haben, ist ja ein Segelboot. Speziell Wind Tiefe etc. Auf der Suche nach einem geeignetet Konverter bin ich im Internet auf Gadgetpool gestossen. Habe auf einen bei Brokhouseonline od. wie die heissen gefunden, eine mail gesandt, eine Antwort erhalten, eine weitere Frage per email gestellt und dann nie wieder was gehört. Nach längerem email hin und her - mit Hr. Wallenwein, den ich für seine Geduld dank sage - habe ich das Teil bestellt. Lieferzeiten Deutschland - HR ca. 10 Tage. Trackingnr war wenig hilfreich, denn das Teil wurde am 8.4. in Frankfurt versandt und dann gab es tagelang kein Update und plötzlich war es in der Marina. (Ist wohl 5 Tage über Zagreb gekreist...) Also ausgepackt und ein paar Tage später dazu aufgerafft, es mal zu testen. Nach dem provisorischem Anschluss an 12V, Treiberinstallation am PC beim USB Anschliessen, Installation am ST Kabel und Softwareinstallation (der gesamte NMEA Teil fehlt noch :-( : (Auf meinem NAvi Tisch siehts derzeit aus wie im Labor...) Funktioniert, das Display macht beim refresh für mich sichtbare "Schatten". (also iwie der refresh, von Oben nach unten) Nach kurzem Herumspielen mit der Konfig Software: USB auf 38400 gestellt, ging nichts mehr. Com Port geöfnet, keine antwort, Terminal Programm gestartet, keine Antwort. Handbuch gelesen und am Gerät wieder auf USB 4800 mit den Tasten konfiguriert. Dürfte ähnliches gewesen sein, wir hier in anderem Beitrag erwähnt. SoftwareUpdate auf 3.12 gemacht, geht problemlos via Konfig Tool. Seit dem Umstellen via Tasten auf USB 4800 zeigt die Software immer USB 1200 an, funktioniert aber mit 4800. Ich habe auch den Eindruck, das Änderungen mit dem Windows Konfigtool möglicherweise nicht im Gerät gespeichert werden, denn beim Softwarestart liest diese von der Bridge aus, und meine Änderungen sind nicht vorhanden. Das kan ich aber erst im Detail testen, wenn ich mich aufraffe, auch den NMEA teil zu verkabeln - dafür muss ich aber noch etwas überlegen: Einen Tischler an Bord zu holen, denn die Bridge will EINGEBAUT werden und ich habe keinen freien Platz dafür - also sollte ich mir ein Kasterl machen lassen, wo alles rein kann: Kabel, Plotter Funke 1+2, Barograph, AIS und die Bridge. Ah ja, die Kabelschuhe auf der Bridge sind etwas wackelig - also bei starkem Seegang kann ich mir vorstellen, dass die Stecker rausgehen. Hier denke ich, werde ich bei Komplettfunktion wohl zu Superkleber greifen .... Wenn die Bridge auch noch die NMEA IN Daten, so wie in der Beschreibung, auf USB mit 38400 ausgibt (AIS mit 38400 Baud!?) - nicht aber die Daten auf ST legt, dann ist die Bridge das einzige per USB an den PC angeschlossene Teil und der Muxer bleibt aussen vor. Wäre cool, denn der Muxer muss an USB angeschlossen sein (Stromversorgung), den kann ich aber auch am USBHUB Strom allein anschliessen oder direkt am 12V Bordnetz und der PC hat einen COM Port weniger zu verwalten... Actisys sagt aber auch: Entweder USB Strom ODER externen Strom und kein USB Anschluss! Die Autopilot Steuerung habe ich mal aktiviert, das tut sich was (STBY u AUTO wird erkannt), aber am "Trockendock" den Autopiloten probieren ist keine gute Idee. Die Track Funktion wird wahrscheinlich auch gehen, da im Handbuch beschrieben, die Fahrt zum rel Windwinkel (STBY UND! AUTO gleichzeitig drücken - ein RAY ST6001 Autopilot) muss ich noch testen. Auch will getsetet werden, ob MAXSea Waypoints dann am RY PLoter angezeigt werden können, das ist aber für mich mehr akademischer Natur. Auf den ersten Blick also (für mich) eine sehr gute Investition!!! Speziell bei Langfahrt und bei Nacht mit Radar kann Kursänderung auch unten am Kartentisch eingegeben werden. Teil 2 folgt dann mal in Kürze. Michael, SY OPHIGAS[/b]


The new season is staring and i just ordered the multiplexer. I will test how it works with st30 speed. I think i saw somewhere that seatalk has 2 commands for speed through water: no.20 and no. 26 if i remember correctly. I will keep the forum posted. M.


Re: Sending data to SeaTalk (1): Circuit Design?

Bearing in mind that this is on a live SeaTalk bus that is relied on, what would you choose?
Well - we have started with the "simple" design found on Thomas Knauf's page. But over the years, we found, that it sometimes causes problems. Especially when there was an autopilot connected, it happened that we had problems with the SeaTalk bus. Meanwhile we improved our design and we use something in between. The users, who reported probems with the old design, got their system running without problems with the new SeaTalk interface. It is not as complicated as the raymarine circuit, but also not as simple as the old design. Best regards Frank


Hi Rick, sorry for not answering for such a long time. Of course I prefere posting in the forum because this can be read by others as well. Personal Email is faster, but others can not learn from it. But since I do not get an automatic email when a new topic is opened in this forum, I just overlooked your posting. sorry again. I'll try to check the forum for new posting more often in the future. So - you get some SeaTalk Data, but not all. Regarding true wind. There is not "true wind" data on the seatalk bus. Each device has to calculate true wind from apparent wind data and boat speed. I do have a SeaTalk-link software version that does this calcualtion. If you like, I can send it to you. Regarding compass data. Wel - if compass data is available on the seatalk bus, the seatalk link schould translate into NMEA. What can we do ? We could temporarly switch-on the output of raw seatalk data, make a logging of this and check if compass data is available on the seatalk bus. We would have to send a command $SNBSE,0,1 to the device. I don't know if that can be done with OpenCPN. Otherwise you could connect to the seatalk link with a termin software. Set it to 4800 Baud, 8 Bit, no parity, no handshake. Set it to send CR and LF whey you press enter. Type $SNBSE,0,1 and press ENTER From now on you should see sentences like $STALK,xx,yy,zz in the openCPN NMEA logging ( or the terminal program ). If you could send me that logfile, I could check if compass data is available on the seatalk bus. Best regards - and again please excuse the long long delay - Frank


Hello OldSalt, sorry for not replying to your posting. I must admit, I simply overlooked it. Unfortunately I don't get a mail, when a new topic is opened in this forum. So I look at it now and than - but I did not see you postings. Sorry again. Regarding your solution for NASA Marine NMEA Senders. We had that problem with TackTick NMEA interfaces as well and other users posted two different solutions [url=]See: Anschluß NMEA Interface Tacktick[/url]. This thread starts in german, but from the third posting on we switched to english. ( Just changed the title ) Would you provide a circuit diagram for the solution you found ? I'm sure this would be helpful for other users as well. Thank you for posting, Frank


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