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Lowrance HDS to Icom 412 NMEA-0183 question.

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Lowrance HDS to Icom 412 NMEA-0183 question.

Old 08-08-2019, 07:52 PM
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Default Lowrance HDS to Icom 412 NMEA-0183 question.

To start off with i have a Lowrance HDS 9 Gen2 Touch and Icom 412 VHF

So the other day I receive a distress call on my VHF. I Looked down to see if any position or information popped up on my HDS. After a minute of not seeing anything i heard the CG chime in on 16. The next day I got looking at my nmea 0183 connection and noticed that it looks like it's set up to only send time and position from the gps to the vhf. I guess this would be good if I ever needed to hit the distress button but it is my understanding that the vhf can also send info to the gps as well (possibly show coordinates of a incoming distress call).

Am I correct in thinking the icom can do the above mentioned in the event of another emergency call? If so how should the 2 be hooked together?
What I have now is my vhf red running to the gps yellow and the vhf red shield to the gps shield and both them running to common ground on fuse block.

Using the below images of the gps and vhf diagrams please let me know if this sounds correct.

VHF RED to GPS YELLOW
VHF RED SHIELD to GPS BLUE
VHF WHITE to GPS ORANGE
VHF WHITE SHIELD to GPS GREEN

Also what's the RS-232 and RS-422 difference?



Thanks for any helpful information guys.
Old 08-09-2019, 07:55 AM
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For advice on making NMEA-0183 connections see

NMEA-0183 Interface Data Collection - CONTINUOUSWAVE

Connections are much simpler if you conform the signal names to the NMEA standard TALKER A/B and LISTENER A/B

Information about HDS Gen3 plotters is given at

NMEA-0183 Interface Data Collection - CONTINUOUSWAVE

Information about ICOM radios is given at

NMEA-0183 Interface Data Collection - CONTINUOUSWAVE

The information you show above for an ICOM IC-M412 is not the same as ICOM shows in their instruction manual. See

http://www.icomamerica.com/en/downlo...x?Document=528

Last edited by jhebert; 08-09-2019 at 08:07 AM.
Old 08-09-2019, 09:31 AM
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Actually it is the same, both state that the icom red is NMEA "IN" wire and the white wire is the NMEA "OUT" wire.

NMEA IN LEAD (Red)
Connect a GPS receiver for position indication.
• A NMEA0183 ver. 2.0 or 3.01 (sentence formatters RMC, GGA, GNS, GLL) compatible GPS receiver is required. Ask your dealer about suitable GPS receivers.

NMEA OUT LEAD (White)
Connect a PC or navigation equipment (NMEA0183 ver. 3.01 sentence formatters DSC, DSE compatible) for plotting position data received from other ships.

Thanks for the links I will look them over and see what I can come up with.
Old 08-09-2019, 01:24 PM
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Originally Posted by Chevymanrc View Post
Actually it [the excerpt posted above] is the same [as the PDF hyperlinked above]...
Where did you get the images and text you posted? Those illustrations are not shown in the owner's manual (that I linked to). Are they from the printed owner's manual that came with your radio?

Since the two documents presumably describe the same radio, it is not surprising they show the same designations for the NMEA-0183 signals.

Is your radio similar in appearance to the radio shown in the ICOM owner's manual (linked in my post above)?

I am surprised that ICOM is still using the obsolete NMEA-0183 unbalanced signals in their M412 model.

What is the approximate age of your radio?


Originally Posted by Chevymanrc View Post
Thanks for the links I will look them over and see what I can come up with.
You will find both the chart plotter and the radio listed in my NMEA-0183 Data Collection.

Last edited by jhebert; 08-09-2019 at 01:31 PM.
Old 08-09-2019, 01:49 PM
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This is the image from the icom download you posted above. Which shows red being in and white being out.
Old 08-09-2019, 01:52 PM
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All electronics are 2014 year models. And right now the way it is wired the date and position shows on the vhf

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