SeaTalkng and NMEA 2000 – Complete guide with system rules and wiring diagrams

What is SeaTalkng (STng)?

SeaTalkng is Raymarine's proprietary network standard based on NMEA 2000, but with its own cables and connectors. It is used to connect autopilots, instruments, MFDs, and sensors in a robust marine network.

Basic principle: SeaTalkng uses a backbone structure with T-connectors, termination at both ends, and a central power input.

STng – Basic System Rules

• The backbone must have termination at both ends.
• Power input should be placed near the center of the network.
• Maximum length of backbone: 40 m.
• Maximum length of drop cables: 6 m.
• A maximum of 3 devices may be daisy-chained.

Examples to avoid:

What is DeviceNet (NMEA 2000)?

NMEA 2000 is an international standard for marine networks. DeviceNet is the physical cable and connector standard used. It is compatible with STng via adapter cables.

Mixed networks – STng and NMEA 2000

It is possible to combine STng and NMEA 2000 using adapter cables. Follow these rules:

• Only one power source for the entire network.
• Correct termination at both ends.
• Avoid double power inputs – this can damage equipment.

Example of correct integration:

Examples to avoid:

Best practices for installation

• Plan the network before installation.
• Use original cables and connectors for STng and DeviceNet.
• Ensure that only one power source is used.
• Test the network with correct termination before operation.