Rick Morel wrote in
news
My experience with Raymarine, about 10 years, has always been that
NMEA data fed in will propagate along the Seatalk as well.

Rick Morel

I also thought this, but was told by an electronics installer that the
st600x displays don't translate the NMEA data into SeaTalk. They only
display it. The course computer does provide the translation. I have no
direct experience with this, so I'd be interested in having this info
verified.

-- Geoff
www.GeoffSchultz.org