Raymarine SeaTalk 1 to SeaTalkng & NMEA 2000

We get asked this electronics question more than just about any other, from customers who have a perfectly operating SeaTalk 1 network and want to add the SeaTalk 1 data to the NMEA 2000 bus. The article deals specifically with older Raymarine products that operate on the proprietary SeaTalk 1 network.

The conversion from SeaTalk 1 to SeaTalkng / NMEA 2000 is actually pretty simple once you have the Raymarine E22158 converter kit:

The SeaTalk 1 to SeaTalkng  Converter Kit can be purchased via the affiliate link below

Raymarine E22158 -Amazon

What You’ll Need:

  • Raymarine E22158 SeaTalk 1 to SeaTalkng conversion kit (see image above)
  • A male or female SeaTalkng to NMEA 2000 drop cable:
  • Male SeaTalkng to NMEA 2000 = A06046
  • Female SeaTalkng to NMEA 2000 = A06045

A lot of boat owners don’t realize that Raymarine’s SeaTalkng is essentially NMEA 2000 that is using Raymarine’s proprietary SeaTalkng cables/connectors. Once your SeaTalk 1 data is converted into SeaTalkng / NMEA 2000 the conversion & connection to the rest of the vessels NMEA 2000 bus is much easier.

The SeaTalk 1 to SeaTalkng converter is actually a small electronic signal converter that has operational software doing the conversion. This converter is not just a busbar or fancy terminals strip, as some have described it. The device below is actually a small processor running software.
WARNING: We have seen a number of individuals physically damage equipment or disable a complete NMEA 2000 system by trying to hard-wire an older SeaTalk 1 network to SeaTalkng or NMEA 2000 networks.


Getting from SeaTalk 1 to SeaTalkng / NMEA 2000 requires a proper electronic language conversion.

Connection to a standard NMEA 2000 network will look similar to this:

In the image above we are connecting a customers SeaTalk 1 instruments to an NMEA 2000 Garmin chart plotter. This wiring puts the SeaTalk 1 data onto the NMEA 2000 Garmin chart plotter..

The total cost for this upgrade will run you slightly over $100.00 in order to get your SeaTalk 1 data converted over to NMEA 2000 based electronics.

Important Notes:
#1 If the E22158 converter is used only as a drop device, to port SeaTalk 1 over to NMEA 2000, and is not at the end of a back bone, or in a backbone, you would not use any terminators in the blue ports.

#2 If the E22158 converter is the end of a back bone, as shown here, a blue terminator would be used. Terminators are only used at either end of a back bone! For empty drop ports you can use Raymarine blanking plugs in the SeaTalkng drop ports or NMEA 2000 blanking caps to protect any unused future expansion ports on an NMEA 2000 bus.

#3 IMPORTANT: Only two terminators are allowed per NMEA 2000 network. One terminator at each end of the back-bone. We’ve seen DIY installations using numerous terminators and no, the systems were not working correctly.

#4 If the SeaTalk 1 network was already powered, and you are connecting to an already powered NMEA 2000 network, you’ll need to disconnected the red power feed wire for the SeaTalk 1 network. Having multiple sources of power can create a potential for ground loops, if not wired correctly.

Good luck and happy boating!

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