SD-sorry if this sounds stupid but....
what is NMEA2000 and AIS?
IDIENS-thats one thing i thought of aswell.i have a shakespear marine
radio that came with my boat and im thinking of replacing it in the near future.secondly i like the idea of all the acessories you can add to it.
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i found a kit for $250 that comes with all the available sensors/transducers listed.