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Old 08-03-2009, 20:41   #1
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Join Date: Jul 2008
Location: New York, NY
Boat: Beneteau First 375
Posts: 93
Connecting Chartplotter to VHF

I am trying to connect a Magellan Nav 6500 chartplotter to a new Icom 504 VHF radio. I have a few questions:

1)On the Icom radio, the NMEA input is one wire with the inner part being NMEA+ and the outer shield labelled NMEA-. How do I connect two normal wires to this? Is there some kind of adaptor? Or do I just try to roll back the shield and twist it into a wire?

2)The Magellan chartplotter has an NMEA+ output but no NMEA- output. The Magellan manual advises just connecting NMEA- to the black wire which also is the 12V negative wire. Can I just connect the VHF's NMEA input (-) to the negative terminal on the breaker panel (would actually be a different subpanel) rather than connecting it to the Magellan's black wire? That seems equivalent.

I'm worried about breaking my expensive new radio and so wanted to make sure I was doing this correctly.
Joe500 is offline   Reply With Quote
Old 09-03-2009, 05:27   #2
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Join Date: Apr 2007
Posts: 718
Yes, you could do it that way, connecting negative to the shield of the nmea input on your VHF if there's some reason for not coming off the chartplotter wiring. The M-504 has an isolated nmea input through an opto-isolator. There is no electrical connection to anything else inside the radio including ground except for a couple of bypass capacitors.

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