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Catalina/Capri 25/250 Sailor's Forums

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NMEA- GPS talk to wind instr.

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RoofRoof
Navigator

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USA
186 Posts

Initially Posted - 11/25/2003 : 10:06:08

I had a new Navman 3100 wind instrument installed this weekend. I also have a Garmin 176C GPS/chartplotter.

I'd like the two to talk to each other via NMEA. I read the Garmin manual and it said to go to the COMM section and click on "NMEA IN/OUT.

But, they still don't communicate.

Anyone using NMEA that has some experience here?

Edited by - on

Arlyn Stewart
Master Marine Consultant

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USA
2980 Posts

Response Posted - 11/25/2003 : 11:06:37

Do the wind and gps normally talk to each other? More common for the wind and gps to be talking to the autopilot. The autopilot because it is receiving data from other instruments can also display data from them, the full featured remote for example can show wind, depth, speed and gps data. In those instances, all of the NMEA data outs of these are taken to the NMEA + of the autopilot. This doesn't provide intercommunication with each other unless a repeater becomes part of the system. A laptop or repeater will receive the outputs of various devices just as the autopilot will with the difference that it will send it on to other devices.

Newer autopilots than mine may have an NMEA out and serve this function... I don't know.

Edited by - Arlyn Stewart on 11/25/2003 11:07:45

Earl Landers
Navigator

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USA
157 Posts

Response Posted - 11/25/2003 : 19:09:57

Roof,
First, let me disclaim being any sort of expert on the NMEA standard. I have sucessfully wired my Garmin 176 to both my VHF (position data) and to my autopilot. Looking at the Navman web site, and more specifically at the manual for the 3100, it indicates that the wind instrument is both a talker and a listener, looking for NMEA 0183 input sentences(RMC, VHW) and output sentences (VWT, WR, MWV, VPW) which was a bit of a surprise to me. But since the NMEA VHW sentence defines water speed and heading which are probably important in determining the vector for "True Wind" direction I can see where it might want that data. For more info about NMEA0183 try this link for a good Q&A http://www.vanhuystee.com/faq_nmea183.html
I would want a close look at the NMEA wiring if they aren't working. Are the "Talk" leads from the GPS wired to the "Listen" leads on the 3100? And are the inverse leads also wired? If the physical layer is wired correctly, do the two devices support the required sentences required to allow them to communicate? The Navman manual indicates it is looking for (RMC, VHW) inputs, the manual for your 176 indicates that it has these outputs (176 manual shows GPRMC, GPGGA, GPGSA, GPGSV, GPGLL, GPBOD, GPRTE, and GPNPL on page 58 of the online manual) I suspect that GPRMC is probably the same as RMC, but it would require a call to Garmin to confirm that. Both units accept VHW as an input, but neither list it as an output. The input sentences for the Garmin are listed as (BWC, DBT, DPT, MTW, VHW, VTG and XTE). The output sentences for the Navman are listed as (VWT, WR, MWV, and VPW) and this may be your reason that they don't talk. The 176 isn't seeing a matching sentence from the Navman.

That's my opinion

and I'm stickin' with it 'tell someone tells me I'm wrong

(which isn't all that uncommon)

Edited by - on

Oscar
Master Marine Consultant

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USA
2030 Posts

Response Posted - 11/25/2003 : 20:08:58

My windvane doesn't have wires attached to it.....I have no laptop, autopilot or instruments.....my hand held GPS is (almost) always on the "present position" screen (and I feel like I'm cheating when I look at it...)......should I stay home?

(Just kidding...my "office" has two autopilots, two GPS's, two computers, two Inertial Reference Units, and hundreds of thousands of $$ worth of other stuff and everything is talking up a storm with each other (when it's all working).....I could write six pages of cryptic techno speak......guess that's why I just use a paper chart when I go sailing......

)

Oscar
250WB#618 Lady Kay on the Chesapeake

Edited by - Oscar on 11/25/2003 20:14:30

lcharlot
Master Marine Consultant

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Antigua and Barbuda
1301 Posts

Response Posted - 11/26/2003 : 08:12:47

<blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by Oscar
 
(Just kidding...my "office" has two autopilots, two GPS's, two computers, two Inertial Reference Units, and hundreds of thousands of Oscar
<hr height="1" noshade id="quote"></blockquote id="quote">

I took a look at Oscar's website - wow! Airline pilot, musician, radio DJ, and of course Sailor...are all ex-pat Netherlanders compulsive over-schievers?

Edited by - on

Oscar
Master Marine Consultant

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USA
2030 Posts

Response Posted - 11/26/2003 : 08:25:30

Hoe bedoelt U?

Oscar
250WB#618 Lady Kay on the Chesapeake

Edited by - on

ClamBeach
Master Marine Consultant

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3072 Posts

Response Posted - 11/26/2003 : 10:12:49

There are two simple rules to remember about electronic devices.

1) Compatible devices aren't.
2) Interchangable devices won't.

Edited by - on

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