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SF, both should accept DSC sentences as 3.01 changes has not to do with position sentences (as of 2002). Dog is probably correct, ICOM uses differential input (current loop) for data ports, much more resilient to electrical noise, so the NMEA (-) is not grounded. Your GPS has traditional i/o based on GROUND. So, connect your NMEA (-) on ICOM to the DC GND. Then connect ICOM NMEA (+) to GPS NMEA TX (Green cable). But 402 only receive information, as it's not capable to transmit an incoming DSC call to your GPS. Another check is yor GPS baudrate, not mentioned by ICOM, the 402 is set to 4.800.
Beneteau Oceanis 43
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