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I have a SI-TEX black box receiver and I'd like to connect it to a Garmin GPS chartplotter. The SI-TEX black box receiver instructions at one point say:"If the GPS has a NMEA output (or NMEA REF) connect this to the supply negative. Do they mean the 12 volt supply negative, the Transmit B(-) or the Receive B(-)? It just isn't clear. What I would really like to know is which GPS wires should I connect the AIS red, blue, black and ground wire to. Could you help?

Posted by kxcamp on


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John Barry

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Yes, the NMEA- output (I think you lefy uot the "-" in your questoin), anyway, the NMEA - or NMEA negative or NMEA ref is hooked to battery supply ground.
Dont forget to program the Garmin to look for 48,000 baud data.

Posted on Jan 13, 2010


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