Garmin 740s GPS to Standard Horizon GX2200 (with AIS) connectivity

I just wanted to update this old thread with some new wiring information (new Standard Horizon GX1300 VHF).
It looks like SH may have changed their color codes in the past 3-4 years, or they just have a different color code for non-AIS models.

Proper wiring for connection between Garmin 740s and SH GX1300 is as follows:

GARMIN 740s <---> Standard Horizon GX1300
NMEA Out+ (Purple) = (Yellow) NMEA In+
NMEA Out- (Gray) = (Green) NMEA Common
NMEA In+ (Blue) = (White) NMEA Out+
NMEA In- (Brown) = Not connected (Brown / NMEA Out-)


Wiring the optional external speaker was also uneventful: White (+) and Shield (-). Polarity probably doesn't really matter for most setups.

I did not have to change any settings on the radio. I just entered my MMSI and everything worked perfectly.

My Garmin was previously set up to communicate with a Garmin VHF, and I didn't have to change anything there, either. I don't recall if any setup was required when I installed the Garmin devices a few years ago.
 

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