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Old 19-11-2008, 07:29   #2
Chuck Baier
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Join Date: Mar 2003
Location: Where ever the boat is.
Boat: Marine Trader 34
Posts: 2,140
Which Garmin are you using. NMEA is usually data in and out and labeled + or - . Raymarine is Seatalk with NMEA inputs on certain devices so need more info to answer your question.
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