Originally Posted by Cornish301000
I have a garmin 451s chart plotter that I want to connect to a standard horizon Gx1600 vhf radio does anyone know the wiring sequence to connect them I have read both manuals but it doesn't seem to work
What did you try?
I've not connected a Garmin, but it was pretty straightforward to connect my Lowrance. The manual will tell you the wiring colours which you will connect something like this:
Garmin NMEA (data) OUT +ve ----------- SH NMEA IN +ve
Garmin NMEA (data) OUT -ve ----------- SH NMEA IN -ve
(if either of those are missing then its just the "black" ground wire)
Then set the Garmin to output NMEA.
If they both offer it then you can connect data in the other direction too.