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Author Topic:   Sharing Data Between Garmin and Simrad Devices using NMEA-2000
tmann45 posted 05-03-2012 08:03 PM ET (US)   Profile for tmann45   Send Email to tmann45  
In another thread about the export of data in GPX format from Lowrance HDS devices, bluewaterpirate said:

"I can also share my data via my NMEA-2000 network between my Simrad and Garmin."

Tell me more about sharing data via NMEA-2000 between these two units. I just copied my Garmin data to a SD card to transfer to my HDS unit-- not difficult, just a multi-step process. If I can transfer data with[out] the use of a SD card, that would be very convenient, especially with fish slimy hands. Thanks.

[Editor'snote: I think the thread tmann makes reference to is]

jimh posted 05-03-2012 08:39 PM ET (US)     Profile for jimh  Send Email to jimh     
Questions about NMEA-2000 ought to be asked of the people at NMEA--you'd think. The NMEA organization has a technical staff on their payroll. I would call up NMEA and ask them this question. Let me know if you get an answer from them.

I recall reading somewhere that the NMEA standard recommends or requires or encourages or tolerates--I don't know exactly which applies here--that manufacturers of equipment that provide NMEA-2000 networking should include a listing of the NMEA-2000 parameter groups that their devices either send or receiver or perhaps relay on the network. Now I don't really know if this is in the standard, because the standard isn't available to me. But, assuming that the information I recall reading is true, then one ought to check the manual that accompanies their NMEA-2000 device to see if it has a list of parameter groups of the NMEA-2000 protocol that it can receive, send, or relay on the network.

For example, I noticed that on the specifications page for a new SIMRAD device, you can get a listing of the NMEA-2000 parameter groups (listed by their number or PGN). Here is the link: SPECIFICATIONS/

Their list is really clumsy web design, but if you click on the hyperlink for "Read More" under the heading of "PGN Data", the specifications will expand. You will see that the SIMRAD device supports certain PGN's.

You should look at the Garmin device to see if it also supports any of those NMEA-2000 PGN's. If you find it does, then I would suspect there is probably a good chance you could have one unit send data to the other using that parameter group. Here is a link 2250_NMEA2000NetworkFundamentals.pdf

to a Garmin document that lists the NMEA-2000 parameter groups (by number) that various Garmin devices can work with.

Exactly how to accomplish that on either of the units should be explained in the instruction manual or operating manual.

NMEA has lately pulled back the curtain slightly on the NMEA-2000 protocol, and they at least have a list of parameter groups and brief descriptions of them. Visit

and use the search criterion set to "Navigation" and you will generate a listing of parameter groups. Some of them look like they could be useful for exchanging information about routes and waypoints.

By the way, you never said what sort of data you want to exchange between the devices. I hope it was navigation data you were asking about.

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