NMEA: Garmin to Raymarine.

[unbusted67]

I have a Raymarine st4000+ wheel pilot that says it accepts vtg,rmc, xte, all of the standard nmea messages. But when I go to the Comms section of my Garmin 440 all of the output messages are things like gpvtg, gprmc, gpxte. I didn't think Garmin had any proprietary nmea messages?

How can I get these two devices to communicate?


Sent from my iPhone using Cruisers Sailing Forum

[unbusted67]

Is it a sea talk thing?


Sent from my iPhone using Cruisers Sailing Forum

[Sailmonkey]

Some of my gain equipment has user selectable output of garmin or NMEA.


Sent from my iPhone using Cruisers Sailing Forum

[muttnik]

Originally Posted by unbusted67

all of the output messages are things like gpvtg, gprmc, gpxte. I didn't think Garmin had any proprietary nmea messages?

Garmin does have proprietary messages (they start with PGRM) but these aren't they. The "GP" is talker ID. "RMC" etc. is the sentence

[smac999]

Gp Is normal. It'll work fine.

[unbusted67]

Ok so if I have a problem it is most likely a physical connectivity issue and not a comms issue between the two devices?


Sent from my iPhone using Cruisers Sailing Forum

[Frankly]

The 4000+ accepts NMEA 0183, be sure that you are connecting to a 0183 source and not NMEA 2000. I have been transferring waypoint info with no problems for years between a Garmin GPS and Raymarine 5000 (essentially same as 4000+).

[unbusted67]

So, I've got the Raymarine to accept xte, btw, and dtw sentences but it won't display sog, utc even though the Garmin lists vtg as an output sentence.

I also can't get my icom m304 to display position data. The 304 manual says it will only receive gps 2.0. Is this the same thing as 0183? There is also a "nmea high speed" setting in the Garmin. Maybe this is the same thing as 2.0?


Sent from my iPhone using Cruisers Sailing Forum

[Opie91]

Originally Posted by unbusted67

So, I've got the Raymarine to accept xte, btw, and dtw sentences but it won't display sog, utc even though the Garmin lists vtg as an output sentence.

I also can't get my icom m304 to display position data. The 304 manual says it will only receive gps 2.0. Is this the same thing as 0183? There is also a "nmea high speed" setting in the Garmin. Maybe this is the same thing as 2.0?


Sent from my iPhone using Cruisers Sailing Forum

First of all the NMEA high speed is mostly used for AIS data and it is at a baud rate of 38400. The Icom M304 is at the standard speed 4800 baud rate, so that is not your problem. The GPS 2.0 they are talking about is NMEA 0183 version 2.0 (4800).

Some radios do not like sharing the same output leg with other devices. In my experience this is especially true with a Garmin GPS. There are two outputs for NMEA 0183 on the Garmin 440, personally I would use one NMEA output for the radio and one for the autopilot. Also make sure that both outputs are set up for NMEA Standard on the 440.

Another thing to check out. You have to connect the NMEA out (+) from the Garmin to the NMEA in (+) on the radio, match the negative legs too. The Garmin uses the negative ground cable as the NMEA (-) leg for all in and out ports. The positive legs all have individual wires.

Here is link to the Garmin wiring diagram for that unit.

http://static.garmincdn.com/pumac/GP...es_INST_EN.pdf

If it still does not work try switching polarity of the wires at the radio connection.

You might want to check that you have the latest software package for the 440 also:

Garmin: GPSMAP 440/440S Change History

Good Luck!