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Wiring Garmin 740s NMEA output to Raymarine Course Computer - NEED HELP

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Wiring Garmin 740s NMEA output to Raymarine Course Computer - NEED HELP

Old 07-25-2013, 01:42 PM
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Default Wiring Garmin 740s NMEA output to Raymarine Course Computer - NEED HELP

Hi there. New to the forum after being a long time follower. Great site! So I have my first issue I am looking for help on.

I have replaced my Northstar GPS Unit, the 951x, with a new Garmin 740s. The Northstar was previously wired into a Raymarine Course Computer via the NMEA input on the computer with a blue/white and violet wire. They are labeled as the NMEA Port 1 Output A (violet wire) and NMEA Port 1 Output A GND (blue/white wire).

On the Garmin 740s, I have a NMEA 0183 port 1 Tx (out) which is the Blue wire and an NMEA 0183 port 1 Rx (in) which is the Brown wire. I do not have two port 1's like the Northstar had.

Any idea which wires I would use from the new Garmin to replace where the Northstar wires went into the computer?

Thank you for your help and input in advance.

Kindly,
Johnny Mac
Old 07-25-2013, 01:54 PM
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Call Garmin tech support, they'll tell you. They are very easy to work with and know their shit...
Old 07-25-2013, 09:45 PM
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Originally Posted by macliver View Post
Hi there. New to the forum after being a long time follower. Great site! So I have my first issue I am looking for help on.

I have replaced my Northstar GPS Unit, the 951x, with a new Garmin 740s. The Northstar was previously wired into a Raymarine Course Computer via the NMEA input on the computer with a blue/white and violet wire. They are labeled as the NMEA Port 1 Output A (violet wire) and NMEA Port 1 Output A GND (blue/white wire).

On the Garmin 740s, I have a NMEA 0183 port 1 Tx (out) which is the Blue wire and an NMEA 0183 port 1 Rx (in) which is the Brown wire. I do not have two port 1's like the Northstar had.

Any idea which wires I would use from the new Garmin to replace where the Northstar wires went into the computer?

Thank you for your help and input in advance.

Kindly,
Johnny Mac
If you only have 1 wire NMEA 0183 - you just use the ground from the garmin as the 2nd wire.
Old 07-27-2013, 09:28 AM
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use the nema 1 out and ground. you also have nmea 1 in . so yes you have 2 port 1's (in and out)

you might have to change the port 1 setting to nmea 183 in the settings menu. it might currently be set to garmin.
Old 07-27-2013, 03:11 PM
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The manual for the 740s is on line. There are two NMEA 0183 ports: Ground for all NMEA 0183 is black, the NMEA port l: brown is RX (in) Blue is TX (out). Port 2: Violet is RX (in), Gray is TX (out). You will have to go back to your manual or the Northstar to double check which goes to the Raymarine:

As smac999 says you may have to go to the menu to check that the ports are properly set to baud rate and output. That is in your manual.

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