"Geoff Schultz" wrote in message
.. .
Quoting from a RayMarine web site, "SeaTalk NG is an NMEA 2000 compatible
system, which can be interconnected to NMEA 2000 networks with an adapter
cable. It can also be interconnected to SeaTalk and SeaTalk2 networks for
backwards compatability with existing Raymarine installations."

They only tell you half the truth... Seatalk and Seatalk NG/aka NMEA2000 can
be interconnected, but there is a small interface box/cable involved which
does the translation between both physical layers AND low level protocol.
The actual content of the datagrams might still be the same, which makes
sense.

NMEA2000 is invented by NMEA and is an application layer on top of CAN,
which is competely different from SeaTalk. Seatalk NG could be the same
type of datagrams used in Seatalk, but stuffed into CAN frames and sent on a
CAN network. There are a few similarities between Seatalk and CAN, like the
short datagrams, collision detection and the connectionless protocol, it is
merely publishing data on a network.

Meindert