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post #1 of 19 Old 06-18-2015 Thread Starter
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NMEA Frustration

I've been dreading this day for a year and have been procrastinating the job for as long. This year's Chicago Mac Saftey Regs are requiring a DSC radio with GPS input in addition to the already required EPIRB.

I have a Raymarine RS125 GPS receiver which is hooked up to a Raymarine C90W chartplotter which is in turn connected via SeaTalk connection to Raymarine ST60 instruments. The VHF is a Uniden UM380.

Every device manual seems to have a different for how to connect these devices together. I've tried every combination, including some schematics from the internet and I cannot get GPS data in to the VHF.

It is my understanding that a "talker" can be paralleled with 4 "listeners", so I should not have a problem adding the VHF to this circuit. The biggest head scratcher is that most online instructions say the only two connections needed are the NMEA In +/- on the VHF to the Data out +/- on the GPS, however the VHF instructions say to connect the bare ground wire to the bare ground on the GPS... Is the ground the same as NMEA In -?

I'm totally confused by this and considering just going and buying a darn radio with the internal GPS and be done with it.
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post #2 of 19 Old 06-18-2015
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Re: NMEA Frustration

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Originally Posted by hillenme View Post
I'm totally confused by this and considering just going and buying a darn radio with the internal GPS and be done with it.
^This! Did that. $199 later, I can't get the GPS NMEA 0183 output from it to talk to anything else, but darnit my DSC works!

I purchased the Standard Horizon Explorer 1700 GPS. A very compact little unit... but if you are going that far consider getting one with AIS as well. Standard Horizon GX2200W

I should have done that, the extra few $$ makes sense to spend to have that as well. Frankly I should have gone with Simrad for my VHF too, as all my other stuff is simnet/NMEA 2000 (buying Simrad brand would have just made it more prug and pray). Just my $0.02.

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post #3 of 19 Old 06-18-2015
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Re: NMEA Frustration

Can't help with your current setup but love the new ICOM DSC/Ais radio we put in with AIS that overlays on the chartplotter. At the time of purchase, I assumed it had a built in GPS (it didn't) so it was a little tricky to get it to talk with the MFD. We put a Command Mic at the helm at the same time. No regrets and very happy to have the improvements. If you want an internal GPS, Standard and Horizon VHF w/ DSC and AIS is the ticket.

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post #4 of 19 Old 06-18-2015
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Re: NMEA Frustration

Hey,

Yes, I believe the ground of the VHF can be tied to any ground.

Some potential trouble spots: Are you sure that your GPS output (this is coming from the C90 right) is set for NMEA 0183 and not seatalk? Have you set up the data for the correct buad rate and that sort of stuff?

Lastly, Raymarine has an excellent web site that is company sponsored and run. You can get LOTS of help there. The URL is
Raymarine Technical Forum

Good luck,
Barry

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post #5 of 19 Old 06-18-2015 Thread Starter
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Thumbs up Re: NMEA Frustration

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Originally Posted by BarryL View Post
Hey,

Some potential trouble spots: Are you sure that your GPS output (this is coming from the C90 right) is set for NMEA 0183 and not seatalk? Have you set up the data for the correct buad rate and that sort of stuff?

Good luck,
Barry
Thanks for the response. I did verify that the Chartplotter is set up for 4800 baud to match the VHF. The C90 has separate cables for SeaTalk which all currently connected to the ST60 instruments, so I would think it would broadcast GPS data through both the SeaTalk and NMEA wires, right? All that said, I was actually trying to just connect the VHF directly to the GPS and not to the chart plotter.

I will definitely check out the link for Raymarine, I didn't realize they had a forum. Thanks!
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post #6 of 19 Old 06-18-2015
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Re: NMEA Frustration

"nly two connections needed are the NMEA In +/- on the VHF to the Data out +/- on the GPS, however the VHF instructions say to connect the bare ground wire to the bare ground on the GPS... Is the ground the same as NMEA In -? "

No it is not the same. The confusion arises from the fact that sometimes signal - refers to the one side of a bipolar output / input, and sometimes to an inverted version of the signal. In the latter case, connecting it to ground at the other end will result in no signal, as the circuit is not complete. Connecting + to + and - to - won't work either, without the ground circuit complete.

Went through all this connecting my Lowrance plotter to my Standard Horizon GX2150 radio.

In that case I connected + out to + in, and ground to ground. The - input is left floating, as is the - output. Ground might be a separate wire, or cable sheath.

If you could provide links to the wiring diagrams for the two devices, I could be more specific.

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post #7 of 19 Old 06-18-2015
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Re: NMEA Frustration

Hey,

According to this doc:
https://www.sv-zanshin.com/manuals/r...rshandbook.pdf

The Ray 125 receiver is NMEA 0183 OR Seatalk. So I bet one problem is that your GPS receiver is NOT outputting NMEA. I do *think* that the C90 will output NMEA0183.

Barry



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Originally Posted by hillenme View Post
Thanks for the response. I did verify that the Chartplotter is set up for 4800 baud to match the VHF. The C90 has separate cables for SeaTalk which all currently connected to the ST60 instruments, so I would think it would broadcast GPS data through both the SeaTalk and NMEA wires, right? All that said, I was actually trying to just connect the VHF directly to the GPS and not to the chart plotter.

I will definitely check out the link for Raymarine, I didn't realize they had a forum. Thanks!

Barry Lenoble
Deep Blue C, 2002 C&C 110
Mt. Sinai, NY

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post #8 of 19 Old 06-18-2015 Thread Starter
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Re: NMEA Frustration

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If you could provide links to the wiring diagrams for the two devices, I could be more specific.

https://www.sv-zanshin.com/manuals/r...rshandbook.pdf <---GPS diagram


Marine Radio Wiring with No White Wire <----Radio Diagram

I have followed the instructions for "Connecting to a GPS Receiver" to no avail. I see here that it does include instructions for connecting to a chart plotter, so I may try that next.

They seem contradictory though as it says "Connect the Yellow wire from the Radio to the positive receive (+NMEA IN) wire from the Chart Plotter." and "Connect the Orange wire from the Radio to the negative receive (-NMEA IN) wire from the Chart Plotter." Why would you be connecting to the IN cables on the Chart plotter from the VHF, the chart plotter is supposed to be the one sending the GPS to the VHF, not vice versa...
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post #9 of 19 Old 06-18-2015
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Re: NMEA Frustration

I honestly have no idea about your particular problem, but often when setting up or dealing with problems with Ray networks in general, it is necessary to make sure your primary unit is the 'master' unit, not the 'slave'. Some networks will not function properly if this is wrong.
As I said, I may be way off base with your network, but if all else fails, you might want to check this.

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post #10 of 19 Old 06-18-2015 Thread Starter
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Re: NMEA Frustration

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Originally Posted by BarryL View Post
Hey,

According to this doc:
https://www.sv-zanshin.com/manuals/r...rshandbook.pdf

The Ray 125 receiver is NMEA 0183 OR Seatalk. So I bet one problem is that your GPS receiver is NOT outputting NMEA. I do *think* that the C90 will output NMEA0183.

Barry
That's interesting... There is only one cable, right? The GPS is currently hooked up using Sea Talk to the C-Series Chart plotter. Should I reconfigure it to be connected using NMEA instead?
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