Thanks Johnny for your help. I was hoping to twist a couple of wires together and go fishing.... I am upgrading Chartplotter and Fishfinder and I do not have a NEMA 2000 network. My current radio is an ICOM 304 (NEMA 0183) and it wired directly to the Garmin Chartplotter to get GPS position. Based on the info above, radio may soon be a back-up since its NEMA 0183. Looks like I have some homework to do. Thanks again,
Andy