Last updated : July 2013
Current Projects :
From NMEA Protocol it reads GPRMC, xxMWV, xxMTW, xxDBT etc.
- Position Lat/lon
- GPS status
- Speed over ground
- Water temperature
Status: Info on LCD Display.
- Speed through Water ( from SeaTalk )
- Speed over ground ( from NMEA )
- Depth ( from Seatalk )
- Water temperature ( from SeaTalk )
- Position Lon/Lat ( from NMEA )
- Apparent wind speed & angle ( from SeaTalk )
Status: Read NMEA Data -> Send to SeaTalk bus
- Speed over Ground ( SeaTalk 52 )
- Speed through Water
- LAT & LON ( SeaTalk 51 & 51 )
- Water Temp ( SeaTalk 27 )
- Special SeaTalk sentence $STALK,xx,yy,zz.... ( Sends any SeaTalk
- Trip & Total Milage( SeaTalk 25 )
- Apparent wind speed & direction
Status: Read SeaTalk -> Send to NMEA port
- Depth ( $IIDBT )
- Apparent. Wind speed. & angle ( $IIMWV )
- Speed through water ( $IIVHW )
- Compass heading ( $IIVHW and $IIHDM )
- Water Temp. ( $IIMTW )
- Trip & Total Milage( $IIVLW )
You can find a detailed and up to date list of implemented SeaTalk and
The software is still under development. This is not a "End User Product"
How to get a board :
For the last version of the PCB, I have ordered serval PCB's.
This is the only way for a private person to get good quality PCB's for a reasonable price.
I still have PCB's and all the electronic parts available
I can send a PCB, all electronic parts and a programmed processor - if you can
solder the board yourself. ( some experience in soldering and electronics required )
For everybody else, I can send a fully assembled and tested board.
If you are interested in getting one please check my webshop at
gadgetPool homepage and webshop
Please read the manual before ordering,
to find out if this device is realy what you need.
If you have any questions pls. send mail to :
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 not an End-User product and must not be used for navigation
Liability cannot be accepted for any damages, personal injuries or
malfunctions caused by this converter.
Latest News :
- I found a nice housing for the Bridge. It costs 4,50 Euro
- I found a nice lcd display that can be connected to the controller. It costs 20,00 Euro
- Users Manual is ready.
- The current software is Version 1.21.
- One user reported,
that a ST60 Wind instument can not deal with speed-over-ground data. It
always wants to "see" speed-through-water.
If you only have a GPS and a
ST60-Wind than you don't have speed-through-water but only speed-over-ground.
I made a special option, where NMEA input speed-over-ground is sent to SeaTalk
So the ST60-Wind thinks we have speed-through-water and
can calculate true windspeed and true heading.
As soon as the Bridge
detects a log on the Seatalk bus ( a stw datagram arrives ) this function is
This is also a good option, if you would like to have you ST60 Wind calculate
true wind from speed over ground instead of speed through water.
When you're sailing in strong currents or on rivers this function allows you to get "real" true wind direction from your ST60/St40 wind instrument.
This functions has been tested on two boats.
Switch on STW=SOG : $SNBSE,14,0
Switch off STW=SOG : $SNBSE,14,1
Version 1.12 Addes $xxGLL. I had a tester who has a GPS not sending $xxRMC.
So I added $xxGLL,VTG to get position, speed and heading.
Here you can find some impressions from the Lab :-)
Download latest Softwareversions
Version 1.5 with LCD
Version 1.5 without LCD
Version 1.6 with LCD
( Watchdog added, reception of $GPRMC and $IIRMC)
Version 1.6 without LCD
Version 1.7 with LCD
(My ST60 now and than sent an "illegal" SeaTalk sentence. In this case the
SeaTalk reception somtimes just stopped and the bridge had to be switched
off/on - solved here.)
Version 1.7 without LCD
Version 1.9 with LCD
Added : Nema course over ground gets sent to SeaTalk
Version 1.9 without LCD
Version 1.10 with LCD
Bugfix: Course magnetic from SeaTalk compass was sometimes wrong
Version 1.10 without LCD
Vserion 1.11 is an internal Test version . Not released
Version 1.12 with LCD
Added NMEA $xxGLL, to get Position from GPS when not $xxRMC is available.
Version 1.12 without LCD
Version 1.13 with LCD
Read NMEA $xxVHW to get Speed Through Water from NMEA
Send $IIMWV when Wind angle changes. No more wait for wind speed change.
Faster Update rate.
Version 1.13 without LCD
Version 1.14 is an internal Test version . Not released
Version 1.15 with LCD
Due to a copy/past error the problem of rebooting, when an illegal SeaTalk
sentence is received, has shown up again. Solved hier in 1.15
Version 1.15 without LCD
Version 1.16 withdrwan
Version 1.17 with LCD
Latest stable and tested version. Had this version running continuosly on my boat for over a week without any problems.
All latest feateures included. ( STW<->SOG see $SNBSE,14,0 )
Version 1.17 without LCD
On the - very good - SeaTalk pages of Thomas Knauf
you can find a small circuit to connect a SeaTalk device to the serial port of your PC.
I have made some PCB's for this circuit.
Since they have a minimum amount when you order, i got several boards.
Today i have 0 PCB's left - sorry.
If you are interested in getting the Eagle PCB files to make the PCB yourself - just send me an
The PCB + resistors + 2 transistors + 2 terminals is 20 Euro.
The boards are not assembled - you'll have to solder yourself :-) .
In the future i will put more reports about my other electonics-,
microcontroller- and hobby projects here.
- Linuxsoftware for my old eprom programmer
- SED1330 Graphics LCD Display at ATmega128 controller.
Click HERE for software and further infomation
- 4*20 LCD Module connected to Ethernut controller using only 2 I/O Pins.
The Display EA-DIP204-4 is a 4*20 LCD display that can be connected
to controllers consuming only 2 I/O Pins .
Click HERE for software and further infomation