Mike;
Yes SeaTalk is proprietary. It is Raymarine's version of
NMEA. They use it for communication between there primary instruments. It basically contains equivalent sentences, but the format is different. They make a small interface box that converts the data back and forth between NMEA and SeaTalk. The data on the SeaTalk side is info like
wind speed and direction, course, position,
water speed, even
autopilot control information.
Their HSB stands for High Speed Bus is Raymarines way of transmitting Very large amounts of data. It has things like Radar and chart plotter
images. There is no good way to get at this data, that I am aware of, asside from Raymarines interface.
Raymarines newest
GPS (Raystar 125) puts out both NMEA and SeaTalk Sentences. The Raystar 120 puts out either one of the two protocols. You had to
purchase the appropriate
antenna. Before that, I believe they were SeaTalk only. All recent (last 10 years or so)
Raymarine equipment will except either protocol. As a matter of fact, both protocols can be present. If the
Autopilot sees both, it will use the NMEA data and discard the SeaTalk sentences. Go figure...
More information can be found at
Raymarine Marine Electronics especially in their support areas.
If you have one of their chart plotter/Radar units, E, C or RL, you can tap the output directly into a
RS232 serial port. I believe they give
wiring instructions on their website.
You think we never stray off topic here at CF!

You are a newbie!:cubalibre Just poking fun. Welcome. There are great folks here.
Keith