RE: Interfacing a Garmin GPS to Furuno FF...Help needed I'll bet I've answered this question 75 times
Garmin Black to ground, and
Garmin Black to Furuno Green and Furuno Black
Connect all three of these wires (Furuno Black, Furuno Green, Garmin Black) to the same grounded point. By Grounded I mean a wire tracing back to the battery's negative terminal, probably through a buss bar of some sort.
Then:
Garmin Brown to Furuno Yellow
Garmin White to Furuno White
Then go to the Furuno's Menu and find the setup for NMEA and set it to the highest version available, probably 2.0
Next go to the Garmin's Setup and find the Communications tab. Click on it and change the data mode from Garmin/Garmin to NMEA-Out/NMEA-In or maybe they are calling it NMEA/NMEA these days.
That should take care of you. You will be able to display Speed Over Ground on the Furuno if you choose but more importantly you will be able to use the Furuno Navigation screens as well as display Speed Through The Water and Water Temperature on your Garmin screen if you choose to.
Thom
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