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I would start with the data that needs to be moved between two devices. Cable and adapter are chosen afterwards. Identical plugs or the word “network” do not mean that two products can exchange the desired information.
Three terms with different roles
| Term | What it describes | Typical question |
|---|---|---|
| NMEA 2000 | A network for supported marine instrument and system data. | Can the receiver use the data types the sender provides? |
| SeaTalkng | Raymarine’s cable system for, among other things, NMEA 2000 data, with its own connectors and backbone/spur components. | Which documented adapter fits this specific connection? |
| Ethernet-based marine networks | Connections for larger amounts of data, such as radar or sonar between compatible devices. | Do the models, software, and network generations support each other? |
Data connection and physical adapter are two separate clarifications
A suitable adapter can connect SeaTalkng and an NMEA 2000 cable system. This does not mean that all data will automatically be available on all displays. Check which messages, also known as PGNs, the specific sender and receiver support.
Older SeaTalk1 is a separate system. Raymarine has a SeaTalk1-to-SeaTalkng converter for supported connections. A cable that merely changes the connector shape does not replace necessary protocol conversion.
Example: new plotter and old instruments
First, write down “wind data from instrument A to plotter B”. Note both model numbers and connections. Then clarify data conversion, power supply, and cables. If you also want a radar image, the radar's connection must be investigated as its own part of the project.
Ethernet does not mean free choice between brands
RayNet and Garmin Marine Network are used for the manufacturers' supported network functions. A physical network connection does not document cross-product compatibility. For example, the Garmin ECHOMAP UHD2 6/7/9 sv manual describes limitations regarding which Marine Network devices the series can connect with.
Create a diagram before purchasing
Draw each device as a box and write the desired information on the connection: wind, depth, engine information, or radar image. Note power supply separately. When combining existing networks, supply and termination must be assessed so that unintended dual power supplies do not occur.
The separate NMEA 2000 guide covers backbones, T-pieces, and terminators. Here, the goal is to clarify what type of connection the project actually requires before you buy the network parts.
Sources and manufacturer documentation
Manufacturer documentation checked September 2026. Always follow the manual for the specific model and installation. The calculation examples are simplified examples for planning purposes.
Moving forward with your solution
Send a list of the devices and the data you want to share, and I will help clarify the network.