Update Dave...
I talked to a friend at Furuno, He said that their Arpa Data Sentence
is TTM(target tracked message) and is updated relatively slowly...app.
every two to three Seconds....He's supposed to send me a volume amount
in bytes and text me the sentence string..from that you can build your
own data stream if you like to test with,the data won't necessarily
change,(although you could do that easy enough I guess) but the volume
and frequency should be easy to duplicate...I'll pass it on to you if
you are interested..
regards,
markvictor